AD 2015-12-10
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney | Division | Airworthiness Directives; Pratt & Whitney Division Turbofan Engines |
Unsafe Condition
Reports of cracks in the high-pressure compressor (HPC) 7th stage integrally bladed (IB) rotor aft integral arm, which could lead to rotor fractures and uncontained engine failure.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Initial and repetitive borescope inspections (BSIs) of the HPC 7th stage IB rotor for cracks. Replace the HPC 7th stage IB rotor if cracks are detected. At the next shop visit, replace the HPC 7th stage IB rotor and remove silver-plated nuts, replacing them with non-silver-plated nuts.
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Compliance Time
Within 180 cycles after the effective date or within 6,500 cycles accumulated on the HPC 7th stage IB rotor, whichever occurs later. Repetitive inspections every 1,000 cycles thereafter.
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Affected Aircraft
All Pratt & Whitney Division PW6122A and PW6124A turbofan engines with HPC 7th stage IB rotor, part number 5495637.
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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