AD Amdt-39-12989
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney | PW4164 | Airworthiness Directives; Pratt & Whitney PW4164, PW4168, and PW4168A Series Turbofan Engines |
Unsafe Condition
Loose or broken front pylon mount bolts made from INCO 718 material and MP159 material, as well as potential failure of the primary mount thrust load path, could result in engine separation from the airplane.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Extend the cycles accumulated before performing the initial inspection for front pylon mount bolts. Reduce the frequency of repetitive inspections for MP159 material bolts. Add a terminating action to the primary mount thrust load path inspections by installing a new increased durability forward engine mount bearing housing.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Not specified in the provided text.
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Affected Aircraft
Pratt & Whitney PW4164, PW4168, and PW4168A series turbofan engines.
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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