AD 91-24-14
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney Division | JT8D-1 | PRATT & WHITNEY Models JT8D-1, -1A, -1B, -5, -7, -7A, -7B, -9, -9A, -11, -15, -15A, -17, -17A, -17R, -17AR, -209, -217, -217A, -217C, and -219 Engines |
| engine | Pratt & Whitney Division | JT8D-11 | PRATT & WHITNEY Models JT8D-1, -1A, -1B, -5, -7, -7A, -7B, -9, -9A, -11, -15, -15A, -17, -17A, -17R, -17AR, -209, -217, -217A, -217C, and -219 Engines |
| engine | Pratt & Whitney Division | JT8D-15 | PRATT & WHITNEY Models JT8D-1, -1A, -1B, -5, -7, -7A, -7B, -9, -9A, -11, -15, -15A, -17, -17A, -17R, -17AR, -209, -217, -217A, -217C, and -219 Engines |
| engine | Pratt & Whitney Division | JT8D-15A | PRATT & WHITNEY Models JT8D-1, -1A, -1B, -5, -7, -7A, -7B, -9, -9A, -11, -15, -15A, -17, -17A, -17R, -17AR, -209, -217, -217A, -217C, and -219 Engines |
| engine | Pratt & Whitney Division | JT8D-17 | PRATT & WHITNEY Models JT8D-1, -1A, -1B, -5, -7, -7A, -7B, -9, -9A, -11, -15, -15A, -17, -17A, -17R, -17AR, -209, -217, -217A, -217C, and -219 Engines |
| engine | Pratt & Whitney Division | JT8D-17A | PRATT & WHITNEY Models JT8D-1, -1A, -1B, -5, -7, -7A, -7B, -9, -9A, -11, -15, -15A, -17, -17A, -17R, -17AR, -209, -217, -217A, -217C, and -219 Engines |
| engine | Pratt & Whitney Division | JT8D-17AR | PRATT & WHITNEY Models JT8D-1, -1A, -1B, -5, -7, -7A, -7B, -9, -9A, -11, -15, -15A, -17, -17A, -17R, -17AR, -209, -217, -217A, -217C, and -219 Engines |
| engine | Pratt & Whitney Division | JT8D-17R | PRATT & WHITNEY Models JT8D-1, -1A, -1B, -5, -7, -7A, -7B, -9, -9A, -11, -15, -15A, -17, -17A, -17R, -17AR, -209, -217, -217A, -217C, and -219 Engines |
| engine | Pratt & Whitney Division | JT8D-1A | PRATT & WHITNEY Models JT8D-1, -1A, -1B, -5, -7, -7A, -7B, -9, -9A, -11, -15, -15A, -17, -17A, -17R, -17AR, -209, -217, -217A, -217C, and -219 Engines |
| engine | Pratt & Whitney Division | JT8D-1B | PRATT & WHITNEY Models JT8D-1, -1A, -1B, -5, -7, -7A, -7B, -9, -9A, -11, -15, -15A, -17, -17A, -17R, -17AR, -209, -217, -217A, -217C, and -219 Engines |
Unsafe Condition
Failure of the No. 4-1/2 bearing seal spacer (P/N 525961) due to lack of hardface, incorrect material color, or material hardness outside Rockwell C32 to C38, leading to No. 4-1/2 bearing failure, uncontained engine failure, inflight shutdown, or possible aircraft damage.
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Required Actions
Conduct a search and review of purchasing and engine maintenance records for the No. 4-1/2 bearing seal spacer. Perform visual inspections for hardface and color, and material hardness testing. If unapproved spacer is found, do not place in service. Perform oil system breather checks at intervals not exceeding 100 hours time in service until 600 hours total time, then one-time inspection by January 31, 1999. Report findings to the Engine Certification Office.
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Compliance Time
Within 15 days after January 21, 1992, for record search; inspections must be done prior to installation or within 45 days after January 21, 1992, whichever comes first. Breather checks within 100 hours time in service after January 21, 1992, repeated every 100 hours until 600 hours. One-time inspection by January 31, 1999.
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Affected Aircraft
Pratt & Whitney JT8D-1, -1A, -1B, -5, -7, -7A, -7B, -9, -9A, -11, -15, -15A, -17, -17A, -17R, -17AR, -209, -217, -217A, -217C, and -219 engines installed on Boeing 727, 737, McDonnell Douglas DC-9, and MD-80 series aircraft.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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