AD 91-03-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney Division | JT9D-7R4D | PRATT & WHITNEY Models JT9D-7R4 Series Engines, |
| engine | Pratt & Whitney Division | JT9D-7R4D1 | PRATT & WHITNEY Models JT9D-7R4 Series Engines, |
| engine | Pratt & Whitney Division | JT9D-7R4E | PRATT & WHITNEY Models JT9D-7R4 Series Engines, |
| engine | Pratt & Whitney Division | JT9D-7R4E1 | PRATT & WHITNEY Models JT9D-7R4 Series Engines, |
| engine | Pratt & Whitney Division | JT9D-7R4E4 | PRATT & WHITNEY Models JT9D-7R4 Series Engines, |
| engine | Pratt & Whitney Division | JT9D-7R4G2 | PRATT & WHITNEY Models JT9D-7R4 Series Engines, |
| engine | Pratt & Whitney Division | JT9D-7R4H1 | PRATT & WHITNEY Models JT9D-7R4 Series Engines, |
Unsafe Condition
Failure of the high pressure compressor (HPC) turbine driveshaft, Part Numbers 5001195-01, 796245, 799570, and 803128, could result in loss of engine power and/or engine inflight shutdown.
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Required Actions
Eddy current inspect and reinspect HPC turbine driveshafts per specified schedules and service bulletins. Replace cracked driveshafts. Reduce low cycle fatigue (LCF) limits and remove driveshafts before exceeding reduced LCF life limits.
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Compliance Time
Required as indicated, unless previously accomplished. Inspections must be done at next shop visit or prior to accumulating specified cycles in service (CIS) or cycles since last inspection (CSLI), as detailed in the AD.
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Affected Aircraft
Pratt & Whitney JT9D-7R4 series engines, including models JT9D-7R4D, JT9D-7R4D1, JT9D-7R4E, JT9D-7R4E1, JT9D-7R4E4, JT9D-7R4G2, and JT9D-7R4H1, installed on Boeing 747, 767, Airbus A310, and A300 aircraft.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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