AD Amdt-39-9721
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney | JT9D-7R4 Series | Airworthiness Directives; Pratt & Whitney JT9D-7R4 Series Turbofan Engines |
Unsafe Condition
LPT vane failures resulting in uncontained engine failures due to EDM slot configuration and potential use of uncured anti-gallant compound on vane retention hardware.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace 3rd, 4th, and 5th stage LPT vane retention bolts and nuts. Remove 5th stage vane configuration with EDM slots and replace with cast slot configuration. Prohibit use of uncured anti-gallant compound on vane retention hardware.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Before further flight
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Affected Aircraft
Pratt & Whitney JT9D-7R4 series turbofan engines
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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