AD 93-18-08
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney Canada Corp. | JT15D-1 | PRATT & WHITNEY CANADA Model JT15D-1, -1A, -1B, -4, -4B, -4C, and -4D Series Engines |
| engine | Pratt & Whitney Canada Corp. | JT15D-1A | PRATT & WHITNEY CANADA Model JT15D-1, -1A, -1B, -4, -4B, -4C, and -4D Series Engines |
| engine | Pratt & Whitney Canada Corp. | JT15D-1B | PRATT & WHITNEY CANADA Model JT15D-1, -1A, -1B, -4, -4B, -4C, and -4D Series Engines |
| engine | Pratt & Whitney Canada Corp. | JT15D-4 | PRATT & WHITNEY CANADA Model JT15D-1, -1A, -1B, -4, -4B, -4C, and -4D Series Engines |
| engine | Pratt & Whitney Canada Corp. | JT15D-4B | PRATT & WHITNEY CANADA Model JT15D-1, -1A, -1B, -4, -4B, -4C, and -4D Series Engines |
| engine | Pratt & Whitney Canada Corp. | JT15D-4C | PRATT & WHITNEY CANADA Model JT15D-1, -1A, -1B, -4, -4B, -4C, and -4D Series Engines |
| engine | Pratt & Whitney Canada Corp. | JT15D-4D | PRATT & WHITNEY CANADA Model JT15D-1, -1A, -1B, -4, -4B, -4C, and -4D Series Engines |
Unsafe Condition
High Pressure Turbine (HPT) assembly failure and inflight engine shutdown or loss of engine power due to HPT blade shift exceeding 0.020 inch.
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Required Actions
Borescope inspect HPT blades for shift using a 3 or 4 mm borescope; incorporate HT blade retaining rivets per SB JT15D 72-7297 Rev 1; install new or reworked HT stator assembly per SB JT15D 72-7307 Rev 2 or SB JT15D 72-7296 Rev 3. Remove HPT assemblies with blade shift over 0.020 inch limit from service before flight.
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Compliance Time
Within 25 hours time in service (TIS) or 30 days after the effective date (November 24, 1993), whichever occurs first, for engines with >275 hours TIS since last inspection. For others, prior to accumulating 300 hours TIS since last inspection. Thereafter, reinspect every 300 hours TIS. Compliance with rivets and stator assembly at next shop visit when engine is disassembled.
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Affected Aircraft
Pratt & Whitney Canada Model JT15D-1, -1A, -1B, -4, -4B, -4C, and -4D series engines installed on various aircraft including Cessna Citation models, Aerospatiale Corvette, Mitsubishi Diamond 1/1A, and Agusta S211.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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