AD 2015-21-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney | Turbofan | Airworthiness Directives; Pratt & Whitney Turbofan Engines |
Unsafe Condition
Crack finds in the 6th stage low-pressure turbine (LPT) disk could lead to failure, uncontained disk release, damage to the engine, and damage to the airplane.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Remove from service 6th stage LPT disks with serial numbers listed in PW Service Bulletin No. PW4G-100-72-252 during the next LPT shop visit after the effective date.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
At the next LPT shop visit after the effective date of this AD.
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Affected Aircraft
Pratt & Whitney PW4164, PW4168, PW4168A, PW4164-1D, PW4168-1D, PW4168A-1D, and PW4170 turbofan engines with 6th stage LPT disks, part number 50N886, 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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