AD 2021-10-09
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | CFM | International | Airworthiness Directives; CFM International, S.A. Turbofan Engines |
Unsafe Condition
Cracks found in the rotating air HPT front seal due to a localized separation of the replaced honeycomb, which may reduce the life of the rotating air HPT front seal.
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Required Actions
Remove, inspect, and replace the affected HPT inner stationary seal. Depending on the findings, replace the rotating air HPT front seal, HPT rotor blades, and No. 3 ball bearing.
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Compliance Time
Before further flight
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Affected Aircraft
All CFM International, S.A. CFM56-5B and CFM56-7B model turbofan engines with a certain high-pressure turbine (HPT) inner stationary seal installed.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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