AD 2012-04-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney | Division | Airworthiness Directives; Pratt & Whitney Division Turbofan Engines |
Unsafe Condition
Engine overspeed event during taxi resulted in a high-pressure compressor surge and tailpipe fire, prompting the need to address the design of the fuel metering units (FMUs).
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace Pratt & Whitney fuel metering units (FMUs), part numbers 53T335 (HS 801000-1), 55T423 (HS 801000-2), and 50U150 (HS 801000-3), at the next shop visit after the effective date of the AD.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
At the next shop visit after 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 PW4050, PW4052, PW4056, PW4060, PW4060A, PW4060C, PW4062, PW4062A, PW4152, PW4156, PW4156A, PW4158, PW4160, PW4460, PW4462, and PW4650 turbofan engines, including models with any dash number suffix.
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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