AD 2001-25-11
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 surges during takeoff on airplanes equipped with PW4000 series turbofan engines, potentially leading to reduced engine stability and power loss due to high pressure compressor (HPC) surge.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Limit the number of PW4000 engines with potentially reduced stability to no more than one on each airplane. Introduce a new cool engine fuel spike test for engines exceeding cyclic limits or undergoing shop work. Limit the number of engines with HPC cutback stator (CBS) configuration to one on each airplane. Place a cyclic limit on CBS engines in service. Establish a minimum rebuild standard for engines returned to service.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Before further flight for affected engines exceeding cyclic limits or undergoing shop work.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Pratt and Whitney PW4000 series turbofan engines, as specified by the affected configurations and cyclic limits outlined in the AD.
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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