AD 97-08-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | CFM International, S.A. | CFM56-3 | Airworthiness Directives; CFM International CFM56-3, -3B, and -3C Series Turbofan Engines |
| engine | CFM International, S.A. | CFM56-3B | Airworthiness Directives; CFM International CFM56-3, -3B, and -3C Series Turbofan Engines |
| engine | CFM International, S.A. | CFM56-3C | Airworthiness Directives; CFM International CFM56-3, -3B, and -3C Series Turbofan Engines |
Unsafe Condition
Low cycle fatigue (LCF) failure of the fan disk, which could result in an uncontained engine failure and damage to the aircraft.
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Required Actions
Remove the fan disk prior to accumulating a total Category C thrust rating life of 20,100 cycles for CFM56-3C engines operating at Category C. Recalculate fan disk total cycles remaining at Category B or A thrust ratings using a Category C life of 20,100 cycles for engines previously operated at Category C. The recalculations must follow Chapter 05 of CFMI-TP.SM.5 Engine Shop Manual.
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Compliance Time
Required as indicated, unless accomplished previously.
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Affected Aircraft
CFM International CFM56-3, -3B, and -3C series turbofan engines with fan disks Part Number 335-014-509-0 or 335-014-511-0, installed on engines currently operating at or previously operated at Category C thrust rating.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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