AD 86-10-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney Division | JT9D-3A | PRATT & WHITNEY Model JT9D-3A Series Engines |
Unsafe Condition
Second stage turbine disk failures resulting from rearward deflection of the second stage turbine nozzle guide vane inner shroud.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect second stage nozzle guide vanes (P/N 770372) for rearward deflection prior to accumulating 4,000 hours in service since new or refurbishment. Reinspect at intervals based on deflection measurements: within next 1,000 hours if deflection is 0.050-0.070 inches, or 2,000 hours if ≤0.050 inches. Remove vanes with deflection >0.070 inches prior to further flight.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Compliance is required as indicated, unless already accomplished.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Pratt & Whitney JT9D-3A series turbofan engines.
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
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.