AD 64-05-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney Division | JT3C-12 | PRATT & WHITNEY Models JT3C-7, JT3C-12, and JT3D Series Engines |
| engine | Pratt & Whitney Division | JT3C-7 | PRATT & WHITNEY Models JT3C-7, JT3C-12, and JT3D Series Engines |
| engine | Pratt & Whitney Division | JT3D-1 | PRATT & WHITNEY Models JT3C-7, JT3C-12, and JT3D Series Engines |
| engine | Pratt & Whitney Division | JT3D-1-MC6 | PRATT & WHITNEY Models JT3C-7, JT3C-12, and JT3D Series Engines |
| engine | Pratt & Whitney Division | JT3D-1-MC7 | PRATT & WHITNEY Models JT3C-7, JT3C-12, and JT3D Series Engines |
| engine | Pratt & Whitney Division | JT3D-1A | PRATT & WHITNEY Models JT3C-7, JT3C-12, and JT3D Series Engines |
| engine | Pratt & Whitney Division | JT3D-1A-MC6 | PRATT & WHITNEY Models JT3C-7, JT3C-12, and JT3D Series Engines |
| engine | Pratt & Whitney Division | JT3D-1A-MC7 | PRATT & WHITNEY Models JT3C-7, JT3C-12, and JT3D Series Engines |
| engine | Pratt & Whitney Division | JT3D-3 | PRATT & WHITNEY Models JT3C-7, JT3C-12, and JT3D Series Engines |
| engine | Pratt & Whitney Division | JT3D-3B | PRATT & WHITNEY Models JT3C-7, JT3C-12, and JT3D Series Engines |
Unsafe Condition
Throttle valve packing leakage in Hamilton Standard JFC25 engine fuel controls could cause severe engine damage.
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Required Actions
Replace packings P/N 562026-28 and -29 with new high burnish finish packings. Replace aluminum throttle valve piston, rod, and lower cylinder with new parts. Conduct fuel control calibration after part installation. Overhaul throttle valve assemblies based on time-in-service thresholds as specified.
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Compliance Time
Within the next 100 hours' time in service after February 27, 1964, or prior to reaching specific time-in-service limits (2,600 or 1,200 hours) since last overhaul, depending on assembly history. Compliance required at every engine fuel control overhaul thereafter.
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Affected Aircraft
Pratt & Whitney JT3C-7, JT3C-12, JT3D Series (including JT3D-1, JT3D-1-MC6, JT3D-1-MC7, JT3D-1A, JT3D-1A-MC6, JT3D-1A-MC7, JT3D-3, etc.) engines with Hamilton Standard JFC25 fuel controls having aluminum throttle valve assemblies.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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