AD 2009-01-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Airbus | A321 | Airworthiness Directives; CFM International, S. A. CFM56-5B Series Turbofan Engines |
| engine | CFM | International | Airworthiness Directives; CFM International, S. A. CFM56-5B Series Turbofan Engines |
Unsafe Condition
High-pressure compressor (HPC) stalls during climb out after takeoff, which could prevent continued safe flight or landing.
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Required Actions
Review exhaust gas temperature (EGT) monitoring records to determine EGT deterioration margin. For airplanes where both engines have greater than 80°C deterioration of EGT margin, borescope-inspect HPC stages 1, 3, 6, and 9 of both engines. Remove from service any engine that does not pass the borescope inspection. If both engines pass, remove one engine and replace it with one having 80°C or less deterioration of EGT margin. Continuously monitor EGT margin on engines in service.
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Compliance Time
Within 14 days of the effective date (December 31, 2008)
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Affected Aircraft
CFM International, S.A. CFM56-5B series turbofan engines, including models CFM56-5B1, -5B2, -5B4, -5B5, -5B6, -5B7, -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, -5B6/2P, -5B4/P1, -5B4/2P1, and -5B9/2P, installed on, but not limited to, Airbus A318, A319, A320, and A321 series airplanes.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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