AD 99-11-09
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney Division | JT9D-59A | Airworthiness Directives; Pratt & Whitney JT9D Series Turbofan Engines |
| engine | Pratt & Whitney Division | JT9D-70A | Airworthiness Directives; Pratt & Whitney JT9D Series Turbofan Engines |
| engine | Pratt & Whitney Division | JT9D-7Q | Airworthiness Directives; Pratt & Whitney JT9D Series Turbofan Engines |
| engine | Pratt & Whitney Division | JT9D-7Q3 | Airworthiness Directives; Pratt & Whitney JT9D Series Turbofan Engines |
Unsafe Condition
Diffuser case rear rail cracking leading to diffuser case rupture, uncontained engine failure, and damage to the aircraft.
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Required Actions
Perform initial and repetitive fluorescent penetrant or eddy current inspections of diffuser case rear rails for cracks per PW JT9D SB No. 5749, Revision 8. Remove and replace diffuser cases not meeting return-to-service criteria. Inspections must be done within 25 cycles of the effective date for overdue engines.
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Compliance Time
Within 25 cycles of the effective date for overdue engines.
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Affected Aircraft
Pratt & Whitney JT9D-59A, -70A, -7Q, and -7Q3 engines installed on Airbus A300, Boeing 747, and McDonnell Douglas DC-10 series aircraft.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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