AD 73-07-08
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
Loosening of fuel control to fuel pump return tube elbow P/N 424790 and jam nut P/N 217477 could cause fuel leakage due to worn mating threads on their loaded sides.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Check jam nut torque value. If torque is below 285 in-lbs, break connection and examine mating threads for wear. Replace worn parts with new/serviceable parts or per Service Bulletin 1511 Rev 4 if threads are worn. Remake fitting per Overhaul Manual if threads are not worn.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within the next 500 hours time in service after the effective date of this AD and every 1000 hours in service thereafter
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Pratt & Whitney JT3D-1, JT3D-1-MC6, JT3D-1-MC7, JT3D-3, and JT3D-3B engines with fuel control to fuel return line elbow P/N 424790 and jam nut P/N 217477
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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