AD 2009-04-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney | PW4090 and PW4090-3 | Airworthiness Directives; Pratt & Whitney PW4090 and PW4090-3 Turbofan Engines |
Unsafe Condition
Uncontained failure of the front turbine hub, part number 53L601, resulting in in-flight engine shutdown and possible damage to the airplane.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Remove front turbine hub, P/N 53L601 (part of assembly P/N 53L121), from service and install a serviceable front turbine hub. The removal schedule depends on the cycles-since-new (CSN) of the hub as of the effective date of the AD.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within the specified compliance times based on the cycles-since-new (CSN) of the front turbine hub as of the effective date of the AD.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Pratt & Whitney PW4090 and PW4090-3 turbofan engines with front turbine hub, part number 53L601 (part of assembly P/N 53L121), installed. These engines are installed on, but not limited to, Boeing 777-200 series and 777-300 series airplanes.
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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