AD 76-24-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney Division | JT9D-20 | PRATT & WHITNEY AIRCRAFT Model JT9D Engines |
| engine | Pratt & Whitney Division | JT9D-20J | PRATT & WHITNEY AIRCRAFT Model JT9D Engines |
| engine | Pratt & Whitney Division | JT9D-3A | PRATT & WHITNEY AIRCRAFT Model JT9D Engines |
| engine | Pratt & Whitney Division | JT9D-59A | PRATT & WHITNEY AIRCRAFT Model JT9D Engines |
| engine | Pratt & Whitney Division | JT9D-7 | PRATT & WHITNEY AIRCRAFT Model JT9D Engines |
| engine | Pratt & Whitney Division | JT9D-70A | PRATT & WHITNEY AIRCRAFT Model JT9D Engines |
| engine | Pratt & Whitney Division | JT9D-7A | PRATT & WHITNEY AIRCRAFT Model JT9D Engines |
| engine | Pratt & Whitney Division | JT9D-7AH | PRATT & WHITNEY AIRCRAFT Model JT9D Engines |
| engine | Pratt & Whitney Division | JT9D-7F | PRATT & WHITNEY AIRCRAFT Model JT9D Engines |
| engine | Pratt & Whitney Division | JT9D-7H | PRATT & WHITNEY AIRCRAFT Model JT9D Engines |
Unsafe Condition
Failure of fan blades due to fatigue originating from undetected foreign object damage.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Visually inspect all fan blades within the next 600 hours time in service after the effective date, and every 600 hours time in service thereafter. Eddy current inspect all fan blades that have been previously damaged and blend repaired within the next 600 hours time in service. Eddy current inspect fan blades reworked per PWA Service Bulletins 4124 or 4262 within the next 3500 hours time in service.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within the next 600 hours time in service after the effective date of this AD, and every 600 hours time in service thereafter (for visual inspections); within the next 600 hours time in service (for eddy current inspections of previously damaged blades); within the next 3500 hours time in service (for eddy current inspections of reworked blades).
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Pratt & Whitney Aircraft JT9D turbofan engines with fan blades part numbers 658931, 718431, 726221, 734721, 735831, 735841, 740421, 740431, 740441, 740521, 741131, 741141, 748231, 748321, 748931, 750621, 750631, 758031, 758181, 758191, 758221, 760631, 760641, 760721, 760731, 760831, 760841, 760941, 761041, 761121, 761131, and 761141.
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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