AD 62-09-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney Division | JT3C-12 | PRATT & WHITNEY Models JT3C- 7 and JT3C-12 Engines |
| engine | Pratt & Whitney Division | JT3C-7 | PRATT & WHITNEY Models JT3C- 7 and JT3C-12 Engines |
Unsafe Condition
Fatigue cracking has occurred in the dovetail attachment of part number 359403 third stage compressor rotor blades.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect blades using an American Cystoscope Makers, Inc. Model B35A-12 or equivalent viewing instrument through an inspection hole in the compressor case and third stage stator shroud. Reinspect blades based on time in service intervals as specified, and replace any cracked blades. Operators must also incorporate the inspection hole and plug per Pratt & Whitney's February 24, 1962 letter and sketch.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Compliance required as indicated in the AD text, with specific intervals based on time in service: inspections within 50 or 350 hours' time in service depending on usage, as detailed in paragraphs (a) and (b).
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Affected Aircraft
Pratt & Whitney JT3C-7 and JT3C-12 Turbojet Engines, all serial numbers.
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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