AD 2010-09-14
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | CFM | International | Airworthiness Directives; CFM International, S.A. CFM56-5B1/P, -5B2/P, -5B3/P, -5B3/P1, -5B4/P, -5B5/P, -5B6/P, -5B7/P, -5B8/P, -5B9/P, -5B1/2P, -5B2/2P, -5B3/2P, -5B3/2P1, -5B4/2P, -5B4/P1, -5B6/2P, -5B4/2P1, and -5B9/2P Turbofan Engines |
Unsafe Condition
HPC stalls, which could prevent continued safe flight or landing, due to EGT margin deterioration.
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Required Actions
Monitor EGT margin deterioration continuously. Remove FADEC software version 5.B.Q and earlier versions from the engine as mandatory terminating action for certain engine models. Remove engines from service if EGT margin deterioration exceeds 75°C.
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Compliance Time
Within 150 cycles in service (CIS) for engines with more than 75°C EGT margin deterioration.
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Affected Aircraft
CFM International, S.A. CFM56-5B series turbofan engines, including models -5B1/P, -5B2/P, -5B3/P, -5B3/P1, -5B4/P, -5B5/P, -5B6/P, -5B7/P, -5B8/P, -5B9/P, -5B1/2P, -5B2/2P, -5B3/2P, -5B3/2P1, -5B4/2P, -5B4/P1, -5B6/2P, -5B4/2P1, and -5B9/2P.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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