AD 98-02-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | CFM International, S.A. | CFM56-5B1/2P | Airworthiness Directives; CFM International CFM56-5B/2P Series Turbofan Engines |
| engine | CFM International, S.A. | CFM56-5B2/2P | Airworthiness Directives; CFM International CFM56-5B/2P Series Turbofan Engines |
| engine | CFM International, S.A. | CFM56-5B3/2P | Airworthiness Directives; CFM International CFM56-5B/2P Series Turbofan Engines |
| engine | CFM International, S.A. | CFM56-5B4/2P | Airworthiness Directives; CFM International CFM56-5B/2P Series Turbofan Engines |
Unsafe Condition
Low cycle fatigue (LCF) failure of the low pressure turbine (LPT) case, which could result in damage to the aircraft.
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Required Actions
Remove from service LPT case, P/N 338-117-404-0, and replace with a serviceable part. The replacement must be done prior to accumulating 10,500 cycles for CFM56-5B2/2P and -5B3/2P engines, and prior to 15,500 cycles for CFM56-5B1/2P and -5B4/2P engines.
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Compliance Time
prior to accumulating 10,500 cycles (for CFM56-5B2/2P and -5B3/2P engines) and prior to 15,500 cycles (for CFM56-5B1/2P and -5B4/2P engines)
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Affected Aircraft
CFM International CFM56-5B1/2P, -5B2/2P, -5B3/2P, and -5B4/2P turbofan engines installed with low pressure turbine (LPT) case, Part Number 338-117-404-0.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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