Airend Overhaul & Rebuild Engineering Hub

AIREND OVERHAUL & REBUILD ENGINEERING HUB

Before rebuild, exchange or replacement, it requires compressor/airend identity, failure evidence, contamination, bearings/seals and internal condition to be assessed against a documented capability boundary. It requires make/model/serial, airend model, hours, lubricant history, alarms, vibration/noise and cause of removal; deliberate lifecycle choice among leave-in-service, repair, controlled rebuild, OEM reman/exchange or new replacement; specialist procedures/tooling/specifications for bearings, seals, rotor condition, alignment and clearances; and assembly records plus agreed performance/condition checks after work. These controls are expanded without inventing factory/OEM-standard capability.

Provisional new-series slug: /compressed-air-engineering/airend-overhaul-rebuild-engineering-hub/ | CTA: Request an Evidence-Based Airend Assessment

An airend should not be 'rebuilt' because it is noisy, old or already removed. first identify the unit, preserve the failure evidence, determine the damage mechanism and prove which lifecycle pathway the condition justifies

It deliberately separates diagnosis, disassembly, inspection, precision measurement, parts disposition, rebuild assembly, specialist processes, validation and warranty/evidence governance.

The governing rule is capability evidence. Knowledge of rebuild principles is not evidence that a workshop can perform rotor machining, dynamic balancing, precision clearance restoration or OEM-equivalent rebuilds. Those claims remain blocked unless actual documented tooling, procedures, tolerances, competence and QA records support them.

1 — Compressor Make

Airend Identity & Provenance: govern compressor make against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

2 — Compressor Model

Airend Identity & Provenance: govern compressor model against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

3 — Compressor Serial

Airend Identity & Provenance: govern compressor serial against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

4 — Airend Make

Airend Identity & Provenance: govern airend make against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

5 — Airend Model

Airend Identity & Provenance: govern airend model against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

6 — Airend Serial

Airend Identity & Provenance: govern airend serial against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

7 — Airend Part Number Boundary

Airend Identity & Provenance: govern airend part number boundary against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

8 — Controller Identity

Airend Identity & Provenance: govern controller identity against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

9 — Motor/Drive Identity

Airend Identity & Provenance: govern motor/drive identity against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

10 — Operating Hours

Airend Identity & Provenance: govern operating hours against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

11 — Load Hours Boundary

Airend Identity & Provenance: govern load hours boundary against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

12 — Installation History

Airend Identity & Provenance: govern installation history against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

13 — Prior Overhaul History

Airend Identity & Provenance: govern prior overhaul history against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

14 — Supplier/Source History

Airend Identity & Provenance: govern supplier/source history against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

15 — Revision Control

Airend Identity & Provenance: govern revision control against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

16 — Cause Of Removal

Failure History: govern cause of removal against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

17 — Alarm History

Failure History: govern alarm history against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

18 — Trip History

Failure History: govern trip history against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

19 — Noise History

Failure History: govern noise history against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

20 — Vibration History

Failure History: govern vibration history against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

21 — Temperature History

Failure History: govern temperature history against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

22 — Capacity Decline

Failure History: govern capacity decline against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

23 — Pressure Behaviour

Failure History: govern pressure behaviour against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

24 — Oil Consumption

Failure History: govern oil consumption against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

25 — Oil Carryover

Failure History: govern oil carryover against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

26 — Separator History

Failure History: govern separator history against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

27 — Recent Service

Failure History: govern recent service against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

28 — Recent Lubricant Change

Failure History: govern recent lubricant change against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

29 — Recent Failure Event

Failure History: govern recent failure event against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

30 — Operator Observation

Failure History: govern operator observation against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

31 — Lubricant Identity

Lubricant & Contamination Evidence: govern lubricant identity against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

32 — Lubricant History

Lubricant & Contamination Evidence: govern lubricant history against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

33 — Oil Analysis

Lubricant & Contamination Evidence: govern oil analysis against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

34 — Water Contamination

Lubricant & Contamination Evidence: govern water contamination against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

35 — Particle Contamination

Lubricant & Contamination Evidence: govern particle contamination against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

36 — Wear Debris

Lubricant & Contamination Evidence: govern wear debris against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

37 — Oxidation Boundary

Lubricant & Contamination Evidence: govern oxidation boundary against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

38 — Varnish/Deposit Boundary

Lubricant & Contamination Evidence: govern varnish/deposit boundary against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

39 — Wrong-Fluid Suspicion

Lubricant & Contamination Evidence: govern wrong-fluid suspicion against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

40 — Mixing Suspicion

Lubricant & Contamination Evidence: govern mixing suspicion against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

41 — Filter Evidence

Lubricant & Contamination Evidence: govern filter evidence against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

42 — Separator Evidence

Lubricant & Contamination Evidence: govern separator evidence against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

43 — Intake Contamination

Lubricant & Contamination Evidence: govern intake contamination against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

44 — Foreign-Object Boundary

Lubricant & Contamination Evidence: govern foreign-object boundary against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

45 — Evidence Preservation

Lubricant & Contamination Evidence: govern evidence preservation against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

46 — As-Found Running State

Pre-Removal Condition: govern as-found running state against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

47 — Pressure

Pre-Removal Condition: govern pressure against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

48 — Temperature

Pre-Removal Condition: govern temperature against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

49 — Vibration

Pre-Removal Condition: govern vibration against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

50 — Noise

Pre-Removal Condition: govern noise against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

51 — Motor Current Boundary

Pre-Removal Condition: govern motor current boundary against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

52 — Flow/Capacity Boundary

Pre-Removal Condition: govern flow/capacity boundary against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

53 — Oil Level

Pre-Removal Condition: govern oil level against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

54 — Leaks

Pre-Removal Condition: govern leaks against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

55 — Separator Dp

Pre-Removal Condition: govern separator DP against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

56 — Intake Restriction

Pre-Removal Condition: govern intake restriction against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

57 — Controller Data

Pre-Removal Condition: govern controller data against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

58 — Photos/Video

Pre-Removal Condition: govern photos/video against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

59 — Fault Codes

Pre-Removal Condition: govern fault codes against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

60 — Baseline Confidence

Pre-Removal Condition: govern baseline confidence against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

61 — Isolation

Removal & Preservation: govern isolation against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

62 — Depressurisation

Removal & Preservation: govern depressurisation against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

63 — Fluid Containment

Removal & Preservation: govern fluid containment against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

64 — Connection Identification

Removal & Preservation: govern connection identification against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

65 — Coupling/Drive Separation

Removal & Preservation: govern coupling/drive separation against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

66 — Lifting Boundary

Removal & Preservation: govern lifting boundary against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

67 — Open-Port Protection

Removal & Preservation: govern open-port protection against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

68 — Cleanliness

Removal & Preservation: govern cleanliness against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

69 — Transport Protection

Removal & Preservation: govern transport protection against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

70 — Evidence Tags

Removal & Preservation: govern evidence tags against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

71 — Removed Parts

Removal & Preservation: govern removed parts against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

72 — Oil Sample

Removal & Preservation: govern oil sample against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

73 — Debris Preservation

Removal & Preservation: govern debris preservation against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

74 — Chain-Of-Custody Boundary

Removal & Preservation: govern chain-of-custody boundary against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

75 — Arrival Condition

Removal & Preservation: govern arrival condition against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

76 — External Damage

Initial Inspection: govern external damage against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

77 — Shaft Condition

Initial Inspection: govern shaft condition against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

78 — Shaft Rotation Boundary

Initial Inspection: govern shaft rotation boundary against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

79 — Endplay Boundary

Initial Inspection: govern endplay boundary against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

80 — Radial Play Boundary

Initial Inspection: govern radial play boundary against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

81 — Seal Leakage

Initial Inspection: govern seal leakage against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

82 — Housing Damage

Initial Inspection: govern housing damage against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

83 — Mounting Damage

Initial Inspection: govern mounting damage against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

84 — Corrosion

Initial Inspection: govern corrosion against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

85 — Heat Discolouration

Initial Inspection: govern heat discolouration against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

86 — Debris

Initial Inspection: govern debris against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

87 — Oil Deposits

Initial Inspection: govern oil deposits against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

88 — Foreign Object Evidence

Initial Inspection: govern foreign object evidence against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

89 — Photo Record

Initial Inspection: govern photo record against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

90 — Inspection Disposition

Initial Inspection: govern inspection disposition against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

91 — Bearing Identity

Bearings & Seals: govern bearing identity against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

92 — Bearing Type Boundary

Bearings & Seals: govern bearing type boundary against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

93 — Bearing Condition

Bearings & Seals: govern bearing condition against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

94 — Race Condition

Bearings & Seals: govern race condition against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

95 — Rolling-Element Condition

Bearings & Seals: govern rolling-element condition against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

96 — Cage Condition

Bearings & Seals: govern cage condition against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

97 — Seal Identity

Bearings & Seals: govern seal identity against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

98 — Seal Condition

Bearings & Seals: govern seal condition against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

99 — Wear Pattern

Bearings & Seals: govern wear pattern against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

100 — Lubrication Evidence

Bearings & Seals: govern lubrication evidence against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

101 — Thermal Evidence

Bearings & Seals: govern thermal evidence against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

102 — Contamination Evidence

Bearings & Seals: govern contamination evidence against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

103 — Fit/Tolerance Boundary

Bearings & Seals: govern fit/tolerance boundary against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

104 — Replacement Disposition

Bearings & Seals: govern replacement disposition against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

106 — Male Rotor Boundary

Rotors & Internal Condition: govern male rotor boundary against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

107 — Female Rotor Boundary

Rotors & Internal Condition: govern female rotor boundary against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

108 — Rotor Surface

Rotors & Internal Condition: govern rotor surface against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

109 — Contact/Rub Evidence

Rotors & Internal Condition: govern contact/rub evidence against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

110 — Scoring

Rotors & Internal Condition: govern scoring against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

111 — Coating Boundary

Rotors & Internal Condition: govern coating boundary against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

112 — Corrosion

Rotors & Internal Condition: govern corrosion against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

113 — Foreign-Object Damage

Rotors & Internal Condition: govern foreign-object damage against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

114 — Deposit/Fouling

Rotors & Internal Condition: govern deposit/fouling against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

115 — Shaft Journal Boundary

Rotors & Internal Condition: govern shaft journal boundary against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

116 — Timing Boundary

Rotors & Internal Condition: govern timing boundary against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

117 — Alignment Boundary

Rotors & Internal Condition: govern alignment boundary against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

118 — Clearance Boundary

Rotors & Internal Condition: govern clearance boundary against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

120 — Measurement Plan

Precision Measurement & Tooling: govern measurement plan against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

121 — Oem/Specialist Specification

Precision Measurement & Tooling: govern OEM/specialist specification against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

122 — Micrometer Boundary

Precision Measurement & Tooling: govern micrometer boundary against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

123 — Bore Gauge Boundary

Precision Measurement & Tooling: govern bore gauge boundary against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

124 — Dial Indicator Boundary

Precision Measurement & Tooling: govern dial indicator boundary against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

125 — Runout Measurement

Precision Measurement & Tooling: govern runout measurement against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

126 — Endplay Measurement

Precision Measurement & Tooling: govern endplay measurement against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

127 — Clearance Measurement

Precision Measurement & Tooling: govern clearance measurement against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

128 — Surface Measurement Boundary

Precision Measurement & Tooling: govern surface measurement boundary against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

129 — Metrology Status

Precision Measurement & Tooling: govern metrology status against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

130 — Tool Calibration Boundary

Precision Measurement & Tooling: govern tool calibration boundary against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

131 — Temperature Control Boundary

Precision Measurement & Tooling: govern temperature control boundary against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

132 — Measurement Uncertainty

Precision Measurement & Tooling: govern measurement uncertainty against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

133 — Record Sheet

Precision Measurement & Tooling: govern record sheet against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

134 — Qa Review

Precision Measurement & Tooling: govern QA review against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

135 — Leave In Service

Lifecycle Pathway Decision: govern leave in service against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

136 — Monitor In Service

Lifecycle Pathway Decision: govern monitor in service against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

137 — Minor Repair

Lifecycle Pathway Decision: govern minor repair against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

138 — Controlled Rebuild

Lifecycle Pathway Decision: govern controlled rebuild against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

139 — Oem Reman/Exchange

Lifecycle Pathway Decision: govern OEM reman/exchange against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

140 — New Airend

Lifecycle Pathway Decision: govern new airend against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

141 — New Compressor Boundary

Lifecycle Pathway Decision: govern new compressor boundary against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

142 — Damage Severity

Lifecycle Pathway Decision: govern damage severity against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

143 — Parts Availability

Lifecycle Pathway Decision: govern parts availability against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

144 — Specialist Capability

Lifecycle Pathway Decision: govern specialist capability against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

145 — Downtime

Lifecycle Pathway Decision: govern downtime against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

146 — Cost Boundary

Lifecycle Pathway Decision: govern cost boundary against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

147 — Warranty Boundary

Lifecycle Pathway Decision: govern warranty boundary against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

148 — Risk/Uncertainty

Lifecycle Pathway Decision: govern risk/uncertainty against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

149 — Decision Approval

Lifecycle Pathway Decision: govern decision approval against the exact airend identity and preserved failure evidence. Do not substitute generic airend tolerances, bearing fits, rotor clearances, balance limits, machining allowances or assembly settings for exact manufacturer/specialist data. Where evidence is incomplete, classify the conclusion as uncertain rather than converting workshop judgement into an unsupported specification.

151 — Premium Airend Assessment Register

152 — Airend Lifecycle Pathway Matrix

154 — Failure Evidence Must Survive Removal

Cleaning, draining, dismantling and discarded parts can destroy evidence. Preserve oil, debris, wear patterns, event history and as-found condition before workshop cleaning.

155 — Rebuild Is One Pathway, Not the Default

Condition and evidence should choose the pathway.

156 — Precision Work Requires Exact Specifications

Bearings, seals, rotor condition, alignment and clearances require specialist procedures, tooling and specifications. Generic values are prohibited.

157 — Post-Work Validation Is Part of the Rebuild

Rebuild is not complete until assembly records and agreed performance/condition checks are documented.

158 — Technical / Airend Hub Verification Gate

Verify identity, failure history, contamination, inspection/measurement, capability, lifecycle pathway and validation plan. No factory-standard, balancing, machining, OEM-spec or warranty claim is permitted without evidence.

160 — AEO / Engineering FAQ Layer

Answer when an airend should be overhauled, what evidence is needed before disassembly, how bearings/seals/rotors are assessed, why clearances are model-specific, what rebuild pathways exist and what proves completion.