AD 2006-16-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney | PW4164 | Airworthiness Directives; Pratt & Whitney PW4164, PW4168, and PW4168A Series Turbofan Engines |
Unsafe Condition
MP159 material pylon bolts do not meet the full life cycle torque check interval requirement, in a bolt-out condition, which could lead to front pylon mount bolt and primary mount thrust load path failure, potentially resulting in engine separation from the airplane.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Perform initial and repetitive torque checks of INCO 718 material front pylon mount bolts, P/N 54T670, and replace if necessary, following specific intervals based on cycles-since-new (CSN). For MP159 material bolts, P/N 51U615, perform initial and repetitive torque checks using specified Accomplishment Instructions. Remove from service front pylon mount bolts P/N 54T670 at or before reaching the life limit of 11,000 CSN. Replace all four bolts if any are loose or broken before further flight.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within specified intervals based on cycles-since-new (CSN) and cycles-in-service (CIS), as detailed in the AD.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Pratt & Whitney PW4164, PW4168, and PW4168A series turbofan engines with front pylon mount bolts, part number (P/N) 54T670 or 51U615, installed. These engines are installed on, but not limited to, Airbus A330 series airplanes.
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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