AD 2003-09-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Pratt | and Whitney PW4000 Series Turbofan | Airworthiness Directives; Pratt and Whitney PW4000 Series Turbofan Engines |
Unsafe Condition
Reports of high pressure compressor (HPC) surges during the takeoff phase of flight attributed to increased stage 14 and stage 15 HPC blade tip clearances caused by excessive wear on the HPC inner rear case rear hook.
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Required Actions
Initially and repetitively borescope-inspect the 14th and 15th stage rubstrips located on the 13th and 14th stage stator set for wear.
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Compliance Time
Not specified in the provided text.
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Affected Aircraft
Pratt and Whitney PW4164, PW4168, and PW4168A turbofan engines, certain serial numbers.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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