AD 78-17-02 R3
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney Division | JT8D-11 | PRATT & WHITNEY AIRCRAFT Models JT8D-9, - 9A, -11, -15, -15A, -17, -17A, -17R, and -17AR Engines |
| engine | Pratt & Whitney Division | JT8D-15 | PRATT & WHITNEY AIRCRAFT Models JT8D-9, - 9A, -11, -15, -15A, -17, -17A, -17R, and -17AR Engines |
| engine | Pratt & Whitney Division | JT8D-15A | PRATT & WHITNEY AIRCRAFT Models JT8D-9, - 9A, -11, -15, -15A, -17, -17A, -17R, and -17AR Engines |
| engine | Pratt & Whitney Division | JT8D-17 | PRATT & WHITNEY AIRCRAFT Models JT8D-9, - 9A, -11, -15, -15A, -17, -17A, -17R, and -17AR Engines |
| engine | Pratt & Whitney Division | JT8D-17A | PRATT & WHITNEY AIRCRAFT Models JT8D-9, - 9A, -11, -15, -15A, -17, -17A, -17R, and -17AR Engines |
| engine | Pratt & Whitney Division | JT8D-17AR | PRATT & WHITNEY AIRCRAFT Models JT8D-9, - 9A, -11, -15, -15A, -17, -17A, -17R, and -17AR Engines |
| engine | Pratt & Whitney Division | JT8D-17R | PRATT & WHITNEY AIRCRAFT Models JT8D-9, - 9A, -11, -15, -15A, -17, -17A, -17R, and -17AR Engines |
| engine | Pratt & Whitney Division | JT8D-9 | PRATT & WHITNEY AIRCRAFT Models JT8D-9, - 9A, -11, -15, -15A, -17, -17A, -17R, and -17AR Engines |
| engine | Pratt & Whitney Division | JT8D-9A | PRATT & WHITNEY AIRCRAFT Models JT8D-9, - 9A, -11, -15, -15A, -17, -17A, -17R, and -17AR Engines |
Unsafe Condition
Cracks in compressor front hubs, part numbers 594301, 791801, 640601, 743301, 750101, and 749801 (excluding serial numbers excluded by Pratt & Whitney Aircraft Alert Service Bulletin No. 4841, Revision 6), could result in fracture of the retention lugs and release of first stage fan blades.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect front compressor hubs for cracks in blade slots per Pratt & Whitney Alert Service Bulletin No. 4841, Revision 6, or equivalent. Remove cracked hubs before further flight. Initial inspections must be done within 1,000 cycles from AD effective date or before reaching Column I limits in the AD, whichever is later. Repeat inspections at intervals per Column II or III based on engine model.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Before further flight for cracked hubs. Initial inspections must be completed within 1,000 cycles from March 30, 1984, or before reaching Column I limits, whichever is later. Subsequent inspections at intervals per Column II or III.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Pratt & Whitney Aircraft models JT8D-9, -9A, -11, -15, -15A, -17, -17A, -17R, and -17AR engines with compressor front hubs P/Ns 594301, 791801, 640601, 743301, 750101, and 749801 (excluding serial numbers excluded by Alert Service Bulletin No. 4841, Revision 6).
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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