AD 2005-05-13
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney | JT9D-59A | Airworthiness Directives; Pratt & Whitney JT9D-59A, -70A, -7Q, and -7Q3 Turbofan Engines |
Unsafe Condition
Failure of the high pressure turbine (HPT) second stage airseal due to cracks in the knife-edges, which if not detected, could result in 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
Replace each existing HPT second stage airseal with an improved design HPT second stage airseal and modify the 2nd stage HPT vane cluster assembly and 1st stage retaining blade HPT plate assembly at next piece-part exposure.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
No later than five years after the effective date of this AD.
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Affected Aircraft
Pratt & Whitney JT9D-59A, -70A, -7Q, and -7Q3 turbofan engines.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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