AD 86-23-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney Division | JT9D-7R4D | PRATT & WHITNEY JT9D-7R4D, D1, E, and E1 Engines |
| engine | Pratt & Whitney Division | JT9D-7R4D1 | PRATT & WHITNEY JT9D-7R4D, D1, E, and E1 Engines |
| engine | Pratt & Whitney Division | JT9D-7R4E | PRATT & WHITNEY JT9D-7R4D, D1, E, and E1 Engines |
| engine | Pratt & Whitney Division | JT9D-7R4E1 | PRATT & WHITNEY JT9D-7R4D, D1, E, and E1 Engines |
Unsafe Condition
Failure of the second stage high pressure turbine rotor (HPTR) airseal can cause an uncontained engine failure.
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Required Actions
Replace HPTR airseal with specified part numbers or rework existing ones per PW Alert Service Bulletin. Replace HPTC airduct assembly with specified part numbers or rework them. Modify first stage turbine rotor assembly by removing and redistributing bolts, washers, and nuts as per the service bulletin.
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Compliance Time
Within 400 or 900 cycles in service (CIS) after the effective date (December 8, 1986), depending on engine series and airseal cycles since new, whichever occurs later.
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Affected Aircraft
Pratt & Whitney JT9D-7R4D, JT9D-7R4D1, JT9D-7R4E, and JT9D-7R4E1 engines.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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