AD 2001-20-13
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney | PW4000 Series | Airworthiness Directives; Pratt & Whitney PW4000 Series Turbofan Engines |
Unsafe Condition
Cracking of high pressure compressor (HPC) front drum rotors, specifically on the spacer surface between the sixth and seventh stage disks, which could result in an uncontained engine failure and damage to the airplane.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Perform initial and repetitive inspections for cracking of HPC front drum rotors based on cycle usage. Remove from service any cracked HPC front drum rotors. Inspections must be conducted within specified intervals, with a five-cycle flyback allowance for engines with suspect crack indications.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 1,500 cycles-since-new (CSN) for the initial inspection, and within 2,200 cycles since the last inspection for repetitive inspections.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Pratt & Whitney PW4000 series turbofan engines, as specified in the referenced service bulletin and AD, with a focus on HPC front drum rotors.
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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