AD Amdt-39-13791
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | CFM | International (CFMI) CFM56-5C Series Turbofan | Airworthiness Directives; CFM International (CFMI) CFM56-5C Series Turbofan Engines |
Unsafe Condition
Low cycle fatigue (LCF) failure of the high pressure turbine rotor (HPTR) front air seals, which could result in an uncontained engine failure and damage to the airplane.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Remove from service HPTR front air seals, part numbers 1523M34P02 and 1523M34P03, before accumulating 4,000 cycles-since-new, and replace with a serviceable part. LCF retirement lives for other components are revised to match original calculations.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within the specified cycle limits for each component as outlined in the AD.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
CFM International (CFMI) CFM56-5C2/G, -5C3/G, and -5C4 series turbofan engines installed on, but not limited to, Airbus Industrie A340 series airplanes.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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