AD 2018-21-11
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Pratt | & Whitney Division (PW) Turbofan | Airworthiness Directives; Pratt & Whitney Division (PW) Turbofan Engines |
Unsafe Condition
certain LPC fan hubs could crack before their published life limit due to low-cycle fatigue
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
repetitive eddy current inspections (ECIs) and fluorescent penetrant inspections (FPIs) for cracks in certain LPC fan hubs, and removal of LPC fan hubs from service that fail inspection
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 50 flight hours
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
all Pratt & Whitney Division (PW) PW4074D, PW4077D, PW4084D, PW4090, and PW4090-3 turbofan engines with a low-pressure compressor (LPC) fan hub, part number (P/N) 51B821 or P/N 52B521, installed
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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