AD 75-10-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Honeywell International Inc. | TPE331-1 | AIRESEARCH MANUFACTURING COMPANY OF ARIZONA Model TPE331 Series Engines |
| engine | Honeywell International Inc. | TPE331-2 | AIRESEARCH MANUFACTURING COMPANY OF ARIZONA Model TPE331 Series Engines |
| engine | Honeywell International Inc. | TPE331-3U | AIRESEARCH MANUFACTURING COMPANY OF ARIZONA Model TPE331 Series Engines |
| engine | Honeywell International Inc. | TPE331-3UW | AIRESEARCH MANUFACTURING COMPANY OF ARIZONA Model TPE331 Series Engines |
| engine | Honeywell International Inc. | TPE331-5 | AIRESEARCH MANUFACTURING COMPANY OF ARIZONA Model TPE331 Series Engines |
| engine | Honeywell International Inc. | TPE331-6 | AIRESEARCH MANUFACTURING COMPANY OF ARIZONA Model TPE331 Series Engines |
Unsafe Condition
Loosening of the torque sensor assembly mounting arm could cause fuel control assembly drive backlash exceeding specified limits, leading to potential engine failure.
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Required Actions
Inspect the fuel control assembly drive according to AiResearch Service Bulletin TPE331-72-0095. Modify the torque sensor assembly mounting arm if backlash exceeds limits before further flight. Repeat inspections at intervals not exceeding 400 hours until modification is done, incorporating the modification before mid-term inspection or overhaul period as per Service Bulletin 606.
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Compliance Time
Before exceeding 200 hours total time in service or an additional 25 hours time in service after the effective date of this AD, whichever occurs later; or before exceeding an additional 100 hours time in service after the effective date for engines with over 200 hours. Modifications must be done before mid-term inspection or overhaul period as per Service Bulletin 606.
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Affected Aircraft
Honeywell International Inc. TPE331-1, TPE331-2, TPE331-3U, TPE331-3UW, TPE331-5, TPE331-6 series engines with specified serial numbers and those modified per AiResearch Service Bulletin TPE331-72-0064.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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