AD 61-26-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney Division | JT3D-1 | PRATT & WHITNEY Models JT3D-1, JT3D-1-MC6, JT3D-1-MC7, and JT3D-3 Engines |
| engine | Pratt & Whitney Division | JT3D-1-MC6 | PRATT & WHITNEY Models JT3D-1, JT3D-1-MC6, JT3D-1-MC7, and JT3D-3 Engines |
| engine | Pratt & Whitney Division | JT3D-1-MC7 | PRATT & WHITNEY Models JT3D-1, JT3D-1-MC6, JT3D-1-MC7, and JT3D-3 Engines |
| engine | Pratt & Whitney Division | JT3D-3 | PRATT & WHITNEY Models JT3D-1, JT3D-1-MC6, JT3D-1-MC7, and JT3D-3 Engines |
Unsafe Condition
Fuel leakage at the fuel transfer points where the fuel pressurizing and dump valve attaches to the engine, leading to inflight engine fires.
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Required Actions
Replace fuel pressurizing and dump valve seals with new seals of part numbers 443098, 379644, 371339, or 367444. Rework the engine according to Service Bulletin No. 274 for metal chevron type seals. Adjust inspection intervals upon FAA approval.
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Compliance Time
Within the next 100 hours' time in service unless already accomplished within the last 200 hours' time in service and every 300 hours' time in service thereafter until metal chevron type seals are incorporated. Not later than the first engine overhaul after June 1, 1962.
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Affected Aircraft
Pratt & Whitney JT3D-1, JT3D-1-MC6, JT3D-1-MC7, and JT3D-3 engines installed in Boeing and Douglas aircraft.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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