AD Amdt-39-11334
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney | JT9D-7R4 Series | Airworthiness Directives; Pratt & Whitney JT9D-7R4 Series Turbofan Engines |
Unsafe Condition
Subsurface anomalies in High Pressure Turbine (HPT) stage 1 and stage 2 disks, potentially formed during the forging process, could lead to HPT disk fractures, resulting in uncontained engine failure, airplane damage, and in-flight engine shutdown.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect HPT stage 1 and stage 2 disks using an improved ultrasonic inspection method at an approved facility during a shop visit. If a crack indicating a subsurface anomaly is found, remove the disk from service and replace it with a serviceable part.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within the applicable maintenance interval or during the next shop visit where the disks are exposed.
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Affected Aircraft
Pratt & Whitney JT9D-7R4 series turbofan engines, specifically HPT stage 1 and stage 2 disks.
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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