AD 78-22-10
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Honeywell International Inc. | TFE731-2 | AIRESEARCH MANUFACTURING COMPANY of ARIZONA Model TFE 731 - 2, - 3 and - 3R Engines |
| engine | Honeywell International Inc. | TFE731-3 | AIRESEARCH MANUFACTURING COMPANY of ARIZONA Model TFE 731 - 2, - 3 and - 3R Engines |
| engine | Honeywell International Inc. | TFE731-3R | AIRESEARCH MANUFACTURING COMPANY of ARIZONA Model TFE 731 - 2, - 3 and - 3R Engines |
Unsafe Condition
Failure of the low pressure rotor thrust ball bearing (number three bearing), Part No. 358736-2, due to improper manufacturing without six radial oil lubrication grooves, which could result in an immediate inflight shutdown of the engine.
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Required Actions
Before further flight, remove and visually inspect the inner face of both halves of the split inner race of the bearing to check for six radial oil lubrication grooves. If grooves are missing, replace the bearing with a conforming part. If grooves are present and the bearing is serviceable, reassemble and reinstall. Special flight permits may be issued under specific conditions.
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Compliance Time
Before further flight after receipt of this AD
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Affected Aircraft
AiResearch Model TFE731-2, -3, and -3R engines with serial numbers listed in the AD, equipped with low pressure rotor thrust ball bearings (Part No. 358736-2) manufactured by SNFA Bearing Corporation.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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