AD 80-12-51 R2
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney Division | JT3D-1 | PRATT & WHITNEY AIRCRAFT Model JT3D Series Engines |
| engine | Pratt & Whitney Division | JT3D-1-MC6 | PRATT & WHITNEY AIRCRAFT Model JT3D Series Engines |
| engine | Pratt & Whitney Division | JT3D-1-MC7 | PRATT & WHITNEY AIRCRAFT Model JT3D Series Engines |
| engine | Pratt & Whitney Division | JT3D-1A | PRATT & WHITNEY AIRCRAFT Model JT3D Series Engines |
| engine | Pratt & Whitney Division | JT3D-1A-MC6 | PRATT & WHITNEY AIRCRAFT Model JT3D Series Engines |
| engine | Pratt & Whitney Division | JT3D-1A-MC7 | PRATT & WHITNEY AIRCRAFT Model JT3D Series Engines |
| engine | Pratt & Whitney Division | JT3D-3 | PRATT & WHITNEY AIRCRAFT Model JT3D Series Engines |
| engine | Pratt & Whitney Division | JT3D-3B | PRATT & WHITNEY AIRCRAFT Model JT3D Series Engines |
| engine | Pratt & Whitney Division | JT3D-3C | PRATT & WHITNEY AIRCRAFT Model JT3D Series Engines |
| engine | Pratt & Whitney Division | JT3D-5A | PRATT & WHITNEY AIRCRAFT Model JT3D Series Engines |
Unsafe Condition
First stage fan blade failures resulting from low cycle fatigue.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Perform visual inspections within 50 cycles after May 27, 1980, and every 200 cycles thereafter. Perform ultrasonic inspections within 200 cycles after July 1, 1980, and every 2,200 cycles thereafter. Remove blades with cracks or indications per specified procedures.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 50 cycles after May 27, 1980, and every 200 cycles thereafter; within 200 cycles after the effective date (July 1, 1980), and every 2,200 cycles thereafter.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Pratt & Whitney Aircraft JT3D series turbofan engines, including models JT3D-1, JT3D-1-MC6, JT3D-1-MC7, JT3D-1A, JT3D-1A-MC6, JT3D-1A-MC7, JT3D-3, JT3D-3B, JT3D-3C, and others as listed.
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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