AD 73-15-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney Division | JT3D-1 | PRATT & WHITNEY Models JT3D-1, JT3D-1-MC6, JT3D-1-MC7, JT3D-3 and JT3D-3B Engines |
| engine | Pratt & Whitney Division | JT3D-1-MC6 | PRATT & WHITNEY Models JT3D-1, JT3D-1-MC6, JT3D-1-MC7, JT3D-3 and JT3D-3B Engines |
| engine | Pratt & Whitney Division | JT3D-1-MC7 | PRATT & WHITNEY Models JT3D-1, JT3D-1-MC6, JT3D-1-MC7, JT3D-3 and JT3D-3B Engines |
| engine | Pratt & Whitney Division | JT3D-3 | PRATT & WHITNEY Models JT3D-1, JT3D-1-MC6, JT3D-1-MC7, JT3D-3 and JT3D-3B Engines |
| engine | Pratt & Whitney Division | JT3D-3B | PRATT & WHITNEY Models JT3D-1, JT3D-1-MC6, JT3D-1-MC7, JT3D-3 and JT3D-3B Engines |
Unsafe Condition
Turbine blade or disc failures resulting from turbine case lug failures
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect turbine nozzle case for missing lugs using Ultrasonic, Isotope, or Visual inspection. Repeat inspections every 1,000 hours time in service if no lugs missing, every 100 hours if one lug missing, remove engine within 50 hours if two or three lugs missing, and remove immediately if four or more lugs missing. Repairs may be done per Overhaul Manual Section 72-51-2 or replacement.
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Compliance Time
First inspection required within 1,000 hours time in service after the effective date of this AD unless already accomplished
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Affected Aircraft
Pratt & Whitney models JT3D-1, JT3D-1-MC6, JT3D-1-MC7, JT3D-3, and JT3D-3B engines with turbine nozzle case Part Numbers 399065, 496859, 570618, 626669, 669045, 669047, 694937, 694938, 390197, 694935, or 691326 incorporating vented 2nd stage outer airseals
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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