AD Amdt-39-10234
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney | JT9D Series | Airworthiness Directives; Pratt & Whitney JT9D Series Turbofan Engines |
Unsafe Condition
Cracked cooling air holes in first stage high pressure turbine (HPT) disks and cracked tie bolt holes in second stage HPT disks could result in turbine disk failure and uncontained engine failure.
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Required Actions
Initial and repetitive fluorescent penetrant inspection (FPI) for cracks in cooling air holes of first stage HPT disks, and tie bolt holes of second stage HPT disks. Replace cracked parts with serviceable components. Report findings of cracked turbine disks.
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Compliance Time
Within specified intervals (e.g., 2,000 flight cycles, 250 flight cycles after effective date for certain conditions).
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Affected Aircraft
Pratt & Whitney JT9D-59A, -70A, -7Q, -7Q3, -7R4D, -7R4D1, -7R4E, and -7R4E1 engines installed on Airbus A300, A310, Boeing 747, 767, and McDonnell Douglas DC-10 series aircraft.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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