AD 86-25-51
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney Division | JT9D-7R4D | PRATT & WHITNEY Models JT9D-7R4D, D1, E, E1, E4, and H1 Engines |
| engine | Pratt & Whitney Division | JT9D-7R4D1 | PRATT & WHITNEY Models JT9D-7R4D, D1, E, E1, E4, and H1 Engines |
| engine | Pratt & Whitney Division | JT9D-7R4E | PRATT & WHITNEY Models JT9D-7R4D, D1, E, E1, E4, and H1 Engines |
| engine | Pratt & Whitney Division | JT9D-7R4E1 | PRATT & WHITNEY Models JT9D-7R4D, D1, E, E1, E4, and H1 Engines |
| engine | Pratt & Whitney Division | JT9D-7R4E4 | PRATT & WHITNEY Models JT9D-7R4D, D1, E, E1, E4, and H1 Engines |
| engine | Pratt & Whitney Division | JT9D-7R4H1 | PRATT & WHITNEY Models JT9D-7R4D, D1, E, E1, E4, and H1 Engines |
Unsafe Condition
Low altitude surges which could result in an inflight shutdown on JT9D-7R4 series engines installed on B767, A310, or A300 aircraft.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect inlet guide vane (IGV), stage 5, stage 6, and stage 7 compressor variable stator vane synchronizing ring runners within 10 calendar days from the effective date. Determine if the engine has a Class 2 average or more. If less than Class 2 average, replace runners or accomplish PW SB 72-316 before further flight. Modify runners per PW SB 72-316 by December 31, 1987.
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Compliance Time
within 10 calendar days in service from the effective date of this AD
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Affected Aircraft
Pratt & Whitney JT9D-7R4D, D1, E, E1, E4, and H1 engines installed on Boeing B767, Airbus A310, and A300 aircraft.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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