AD 75-07-10
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Honeywell International Inc. | TFE731-2 | AIRESEARCH MANUFACTURING COMPANY of ARIZONA Model TFE731-2 and -3 Series Engines |
| engine | Honeywell International Inc. | TFE731-2A | AIRESEARCH MANUFACTURING COMPANY of ARIZONA Model TFE731-2 and -3 Series Engines |
| engine | Honeywell International Inc. | TFE731-2B | AIRESEARCH MANUFACTURING COMPANY of ARIZONA Model TFE731-2 and -3 Series Engines |
| engine | Honeywell International Inc. | TFE731-2BR | AIRESEARCH MANUFACTURING COMPANY of ARIZONA Model TFE731-2 and -3 Series Engines |
| engine | Honeywell International Inc. | TFE731-2C | AIRESEARCH MANUFACTURING COMPANY of ARIZONA Model TFE731-2 and -3 Series Engines |
| engine | Honeywell International Inc. | TFE731-3 | AIRESEARCH MANUFACTURING COMPANY of ARIZONA Model TFE731-2 and -3 Series Engines |
| engine | Honeywell International Inc. | TFE731-3A | AIRESEARCH MANUFACTURING COMPANY of ARIZONA Model TFE731-2 and -3 Series Engines |
| engine | Honeywell International Inc. | TFE731-3AR | AIRESEARCH MANUFACTURING COMPANY of ARIZONA Model TFE731-2 and -3 Series Engines |
| engine | Honeywell International Inc. | TFE731-3B | AIRESEARCH MANUFACTURING COMPANY of ARIZONA Model TFE731-2 and -3 Series Engines |
| engine | Honeywell International Inc. | TFE731-3BR | AIRESEARCH MANUFACTURING COMPANY of ARIZONA Model TFE731-2 and -3 Series Engines |
Unsafe Condition
Wear of the transfer gearbox vertical bevel gear bearing support can result in failure of the accessory drive and contamination of the engine lubrication system.
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Required Actions
Inspect the lower shoulder of transfer gearbox vertical bearing support for wear and replace as required per AiResearch Service Bulletin TFE731-72-3019. The inspections may be discontinued if equipped with transfer gearbox assembly P/N 3070093-3 (Series I, Change 2 or Series 3) or after replacing bearing support P/N 3070217-1 with improved P/N 3070217-3 per Service Bulletin TFE731-72-3020.
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Compliance Time
Within the next 25 hours time in service after receipt of this Airworthiness Directive, and at intervals not to exceed 50 hours time in service thereafter.
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Affected Aircraft
AiResearch Manufacturing Company of Arizona Model TFE731-2 and -3 series engines.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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