AD 76-12-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney Division | JT9D-20 | PRATT & WHITNEY Model JT9D Engines |
| engine | Pratt & Whitney Division | JT9D-20J | PRATT & WHITNEY Model JT9D Engines |
| engine | Pratt & Whitney Division | JT9D-3A | PRATT & WHITNEY Model JT9D Engines |
| engine | Pratt & Whitney Division | JT9D-59A | PRATT & WHITNEY Model JT9D Engines |
| engine | Pratt & Whitney Division | JT9D-7 | PRATT & WHITNEY Model JT9D Engines |
| engine | Pratt & Whitney Division | JT9D-70A | PRATT & WHITNEY Model JT9D Engines |
| engine | Pratt & Whitney Division | JT9D-7A | PRATT & WHITNEY Model JT9D Engines |
| engine | Pratt & Whitney Division | JT9D-7AH | PRATT & WHITNEY Model JT9D Engines |
| engine | Pratt & Whitney Division | JT9D-7F | PRATT & WHITNEY Model JT9D Engines |
| engine | Pratt & Whitney Division | JT9D-7H | PRATT & WHITNEY Model JT9D Engines |
Unsafe Condition
Failure of the sixth stage turbine disk resulting from an oil fire in the No. 4 bearing area.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Visually inspect the engine tailpipe/exhaust case area daily to determine oil leakage from the No. 4 bearing area. If leakage is found, either inspect and replace cracked or blocked No. 4 bearing oil pressure and scavenge tubes with new or serviceable parts, or drill a drain hole in the turbine exhaust case inner flow path wall per Pratt and Whitney Alert Service Bulletin 4552 or later FAA-approved revision.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
once each day the engine is operated
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Pratt & Whitney JT9D Turbofan Engines with turbine exhaust cases part numbers 701877, 728301-728309, 731370-731373, 731377, 731565, 738438, 739431, 746128, 746272-746274, 749510, 752872-752876, 754763, 756838, and 761943.
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
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.