AD 70-19-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Honeywell International Inc. | TPE331-1 | Airworthiness Directives; AIRSEARCH Model TPE331-1 and -2 Engines |
| engine | Honeywell International Inc. | TPE331-1U | Airworthiness Directives; AIRSEARCH Model TPE331-1 and -2 Engines |
| engine | Honeywell International Inc. | TPE331-1UA | Airworthiness Directives; AIRSEARCH Model TPE331-1 and -2 Engines |
| engine | Honeywell International Inc. | TPE331-2 | Airworthiness Directives; AIRSEARCH Model TPE331-1 and -2 Engines |
| engine | Honeywell International Inc. | TPE331-2U | Airworthiness Directives; AIRSEARCH Model TPE331-1 and -2 Engines |
| engine | Honeywell International Inc. | TPE331-2UA | Airworthiness Directives; AIRSEARCH Model TPE331-1 and -2 Engines |
Unsafe Condition
Impeding failure of the high speed pinion bearings due to oil contamination and metal particle accumulation.
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Required Actions
Conduct oil sample and filter element examination, obtain written confirmation of acceptable oil contamination levels, perform a visual inspection for metal particles in the oil filter, and revise the Airplane Flight Manuals with a cautionary note on torque pressure fluctuations.
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Compliance Time
Within specified time frames: (a) After more than 5 hours but before exceeding 25 hours time in service after the effective date; (b) Within 10 hours time in service after the effective date; (c) Within 50 hours time in service after the effective date.
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Affected Aircraft
Honeywell International Inc. TPE331-1, TPE331-1U, TPE331-1UA, TPE331-2, TPE331-2U, TPE331-2UA engines installed in Mooney MU-2, Merlin 2B, Volpar Turboliner, and Short Skyvan aircraft.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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