AD 2000-16-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney | PW4164 | Airworthiness Directives; Pratt & Whitney PW4164, PW4168, and PW4168A Series Turbofan Engines |
Unsafe Condition
Fatigue testing shows insufficient fatigue life expectancy for front pylon mount bearing housings, which could lead to front pylon mount bolt and primary mount thrust load path failure, potentially resulting in engine separation from the airplane.
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Required Actions
Inspect front pylon mount bolts made from INCO 718 material and MP159 material, perform initial and repetitive torque checks, and conduct initial and repetitive visual inspections of the primary mount thrust load path. Replace bolts if necessary and revise the cyclic life limit for front pylon mount bolts.
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Compliance Time
Before further flight for initial inspections; repetitive inspections at specified intervals (e.g., 750-1,250 cycles-in-service for INCO 718 bolts, 5,750-6,250 cycles-in-service for MP159 bolts).
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Affected Aircraft
Pratt & Whitney PW4164, PW4168, and PW4168A series turbofan engines, with specific focus on front pylon mount bolts made from INCO 718 and MP159 materials.
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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