AD 99-06-16
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | CFM International, S.A. | CFM56-5 | Airworthiness Directives; CFM International CFM56-5 Series Turbofan Engines |
| engine | CFM International, S.A. | CFM56-5-A1/F | Airworthiness Directives; CFM International CFM56-5 Series Turbofan Engines |
| engine | CFM International, S.A. | CFM56-5A4 | Airworthiness Directives; CFM International CFM56-5 Series Turbofan Engines |
| engine | CFM International, S.A. | CFM56-5A4/F | Airworthiness Directives; CFM International CFM56-5 Series Turbofan Engines |
| engine | CFM International, S.A. | CFM56-5A5 | Airworthiness Directives; CFM International CFM56-5 Series Turbofan Engines |
| engine | CFM International, S.A. | CFM56-5A5/F | Airworthiness Directives; CFM International CFM56-5 Series Turbofan Engines |
Unsafe Condition
Low cycle fatigue (LCF) failure of the high pressure turbine rotor (HPTR) front air seal could result in an uncontained engine failure and damage to the aircraft.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Remove from service CFM International CFM56-5 series turbofan engine HPTR front air seals based on their accumulated cycles since new (CSN) and engine shop visit schedules, and replace with serviceable parts per Service Bulletin 72-541. Recalculate remaining cycles for seals previously used in affected engine models within 750 cycles in service (CIS) after the AD's effective date.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Required as indicated, unless accomplished previously.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
CFM International CFM56-5 series turbofan engines installed on, but not limited to, Airbus A319 and A320 series aircraft.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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