AD 2007-26-20
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney Division | PW4164 | Airworthiness Directives; Pratt & Whitney (PW) PW4164, PW4168, and PW4168A Turbofan Engines |
| engine | Pratt & Whitney Division | PW4168 | Airworthiness Directives; Pratt & Whitney (PW) PW4164, PW4168, and PW4168A Turbofan Engines |
| engine | Pratt & Whitney Division | PW4168A | Airworthiness Directives; Pratt & Whitney (PW) PW4164, PW4168, and PW4168A Turbofan Engines |
Unsafe Condition
Improperly manufactured LPT stage 4 disks, part number 51N404, may result in low-cycle fatigue (LCF) leading to uncontained engine failure.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Remove certain LPT stage 4 disks listed by serial number at the next piece-part exposure or within 7,500 cycles-since-new (CSN).
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 7,500 cycles-since-new or at the next piece-part exposure, whichever occurs first.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Pratt & Whitney PW4164, PW4168, and PW4168A turbofan engines with LPT stage 4 disks (P/N 51N404) as specified in the AD.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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