AD 2011-14-07
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Pratt | & Whitney (PW) Models PW4074 and PW4077 Turbofan | Airworthiness Directives; Pratt & Whitney (PW) Models PW4074 and PW4077 Turbofan Engines |
Unsafe Condition
Multiple shop findings of cracked 15th stage high-pressure compressor (HPC) disks. Cracks could propagate into the bolt holes, leading to disk failure, uncontained engine failure, and damage to the airplane.
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Required Actions
Remove the 15th stage HPC disk before accumulating 12,000 cycles since new (CSN). For disks exceeding 12,000 CSN after the effective date, use a drawdown plan with borescope inspection (BSI) or eddy current inspection (ECI) of the rim for cracks. If cracks are detected, remove the disk from service before further flight.
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Compliance Time
Within 12,000 cycles since new (CSN) or within 2,135 cycles-in-service (CIS) after the effective date for disks exceeding 9,865 CSN on the effective date.
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Affected Aircraft
Pratt & Whitney PW4074 and PW4077 turbofan engines with 15th stage HPC disks, part number 55H615, installed.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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