AD 2000-23-14
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney | JT9D Series | Airworthiness Directives; Pratt & Whitney JT9D Series Turbofan Engines |
Unsafe Condition
Loss of integrity in the oil system allows oil to migrate into high temperature metal cavities in the turbine exhaust case, causing oil fires. These fires can lead to excessive thermal growth of the sixth stage low pressure turbine (LPT) disk, liberation of the disk, uncontained engine failure, and damage to the airplane.
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Required Actions
Install an improved No. 4 bearing internal oil pressure tube. Perform initial and repetitive inspections of the No. 4 bearing oil pressure tube for turbine exhaust case (TEC) strut clearance and alignment. Replace with serviceable parts if necessary, in accordance with Pratt & Whitney Service Bulletin No. 5707 and JT9D Engine Manuals.
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Compliance Time
Before further flight
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Affected Aircraft
Pratt & Whitney JT9D-3A, -7, -7A, -7AH, -7H, -7F, -7J, -7Q, -7Q3, -20, -20J, -59A, -70A, and -7R4D (BG 700) series turbofan engines, installed on but not limited to Boeing 747 and 767, Airbus A300, and McDonnell Douglas DC-10 series airplanes.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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