AD 88-24-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney Division | JT9D-20 | PRATT & WHITNEY Model JT9D-3A, -7, -7A, - 7AH, -7H, -7F, -7J, and -20 Engines |
| engine | Pratt & Whitney Division | JT9D-3A | PRATT & WHITNEY Model JT9D-3A, -7, -7A, - 7AH, -7H, -7F, -7J, and -20 Engines |
| engine | Pratt & Whitney Division | JT9D-7 | PRATT & WHITNEY Model JT9D-3A, -7, -7A, - 7AH, -7H, -7F, -7J, and -20 Engines |
| engine | Pratt & Whitney Division | JT9D-7A | PRATT & WHITNEY Model JT9D-3A, -7, -7A, - 7AH, -7H, -7F, -7J, and -20 Engines |
| engine | Pratt & Whitney Division | JT9D-7AH | PRATT & WHITNEY Model JT9D-3A, -7, -7A, - 7AH, -7H, -7F, -7J, and -20 Engines |
| engine | Pratt & Whitney Division | JT9D-7F | PRATT & WHITNEY Model JT9D-3A, -7, -7A, - 7AH, -7H, -7F, -7J, and -20 Engines |
| engine | Pratt & Whitney Division | JT9D-7H | PRATT & WHITNEY Model JT9D-3A, -7, -7A, - 7AH, -7H, -7F, -7J, and -20 Engines |
| engine | Pratt & Whitney Division | JT9D-7J | PRATT & WHITNEY Model JT9D-3A, -7, -7A, - 7AH, -7H, -7F, -7J, and -20 Engines |
Unsafe Condition
Sixth stage turbine inner airseal (IAS) rupture that can cause uncontained engine failure.
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Required Actions
Modify sixth stage IAS parts with specific part numbers per PW Service Bulletin 4835, Revision 5. Wet abrasive blast, visually inspect, and fluorescent penetrant inspect IAS assemblies at the next LPT module shop visit. Remove and replace cracked IAS assemblies before further flight.
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Compliance Time
Within the next 500 cycles in service after December 15, 1988, or at the next LPT module shop visit after December 15, 1988, depending on seal knife edge to shroud diametrical clearance.
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Affected Aircraft
Pratt & Whitney JT9D-3A, -7, -7A, -7AH, -7H, -7F, -7J, and -20 engines.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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