AD 2012-18-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney | Division | Airworthiness Directives; Pratt & Whitney Division Turbofan Engines |
Unsafe Condition
Cracked 1st stage high-pressure turbine (HPT) air seal rings, which could lead to an internal oil fire, 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 and replace the 1st stage HPT seal support and inspect the 1st stage HPT air seal ring.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
The next time the HPT module is removed from the engine, unless already done.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Pratt & Whitney Division PW4000-94'' and PW4000-100'' turbofan engines having a 1st stage HPT seal support, part number (P/N) 55K601 (contained within assembly P/N 55K602-01) or P/N 50K532 (contained within assembly P/N 50K530-01), 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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