AD 2012-13-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney | Turbofan | Airworthiness Directives; Pratt & Whitney Turbofan Engines |
Unsafe Condition
Cracked 15th stage high-pressure compressor (HPC) disks could result in a failure of the disk, uncontained engine failure, and damage to the airplane.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Remove 15th stage HPC disks with 9,865 or fewer cycles since new (CSN) before accumulating 12,000 CSN. For disks with more than 9,865 CSN, either remove the disk within 2,135 cycles-in-service (CIS) after the AD's effective date or perform a borescope inspection (BSI) or eddy current inspection (ECI) of the disk outer rim front rail according to specified schedules. If a crack is detected, remove the disk from service before further flight.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within the compliance times specified in the AD, unless already done.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Pratt & Whitney Division PW4074 and PW4077 turbofan engines with 15th stage HPC disks, part number 55H615, installed.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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