AD 90-03-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Honeywell International Inc. | TFE731-3 | GARRETT ENGINE DIVISION, ALLIED SIGNAL INCORPORATED Models TFE731-3, -3A, -3AR, and -3R Engines |
| engine | Honeywell International Inc. | TFE731-3A | GARRETT ENGINE DIVISION, ALLIED SIGNAL INCORPORATED Models TFE731-3, -3A, -3AR, and -3R Engines |
| engine | Honeywell International Inc. | TFE731-3AR | GARRETT ENGINE DIVISION, ALLIED SIGNAL INCORPORATED Models TFE731-3, -3A, -3AR, and -3R Engines |
| engine | Honeywell International Inc. | TFE731-3R | GARRETT ENGINE DIVISION, ALLIED SIGNAL INCORPORATED Models TFE731-3, -3A, -3AR, and -3R Engines |
Unsafe Condition
Uncontained engine failure due to potential failure of high pressure turbine rotor (HPTR) discs with part numbers 3072316-2, -3, and 3073110-1, -2.
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Required Actions
Remove and replace specific serial number HPTR discs with serviceable parts per Garrett Alert Service Bulletin TFE731-A72-3388. Ferrying allowed under FAR 21.197 and 21.199. Alternate compliance may be approved with substantiating data.
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Compliance Time
Next access to the turbine rotor assembly or within 150 operating cycles after the effective date of this AD or prior to June 1, 1990, whichever occurs first.
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Affected Aircraft
Garrett Engine Division, Allied Signal Incorporated Models TFE731-3, -3A, -3AR, and -3R engines with HPTR discs part numbers 3072316-2, -3, and 3073110-1, -2.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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