AD 93-14-20
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney Division | JT9D-59A | PRATT & WHITNEY Models JT9D-59A, -70A, -7Q, and -7Q3 Engines |
| engine | Pratt & Whitney Division | JT9D-70A | PRATT & WHITNEY Models JT9D-59A, -70A, -7Q, and -7Q3 Engines |
| engine | Pratt & Whitney Division | JT9D-7Q | PRATT & WHITNEY Models JT9D-59A, -70A, -7Q, and -7Q3 Engines |
| engine | Pratt & Whitney Division | JT9D-7Q3 | PRATT & WHITNEY Models JT9D-59A, -70A, -7Q, and -7Q3 Engines |
Unsafe Condition
Uncontained high pressure turbine (HPT) stage 2 blade fractures or lenticular airseal failures.
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Required Actions
Borescope inspect HPT stage 2 vanes according to PW SB 5667, Rev 2 and applicable PW Maintenance Manual criteria. Remove from service vanes exhibiting distress beyond serviceable limits prior to further flight.
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Compliance Time
Prior to accumulating 1,000 hours time in service (TIS) since vane installation, or within the next 125 hours TIS after the effective date of this AD, whichever occurs later (for engines not incorporating SB 5566/5428). For engines with SB 5566/5428, prior to 2,000 hours total part TIS since new or within 1,000 hours TIS since vane installation, or within the next 125 hours TIS after the effective date, whichever occurs later.
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Affected Aircraft
Pratt & Whitney JT9D-59A, -70A, -7Q, and -7Q3 engines with HPT stage 2 vane assemblies having part numbers 743772, 774872, 806272, 807372, 807772, 807072, or 808372.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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