AD 78-05-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Honeywell International Inc. | TPE331-1 | AIRESEARCH MANUFACTURING COMPANY OF ARIZONA Model TPE331-1, -2, -3, -5, and -6 Series Engines |
| engine | Honeywell International Inc. | TPE331-1U | AIRESEARCH MANUFACTURING COMPANY OF ARIZONA Model TPE331-1, -2, -3, -5, and -6 Series Engines |
| engine | Honeywell International Inc. | TPE331-1UA | AIRESEARCH MANUFACTURING COMPANY OF ARIZONA Model TPE331-1, -2, -3, -5, and -6 Series Engines |
| engine | Honeywell International Inc. | TPE331-2 | AIRESEARCH MANUFACTURING COMPANY OF ARIZONA Model TPE331-1, -2, -3, -5, and -6 Series Engines |
| engine | Honeywell International Inc. | TPE331-2U | AIRESEARCH MANUFACTURING COMPANY OF ARIZONA Model TPE331-1, -2, -3, -5, and -6 Series Engines |
| engine | Honeywell International Inc. | TPE331-2UA | AIRESEARCH MANUFACTURING COMPANY OF ARIZONA Model TPE331-1, -2, -3, -5, and -6 Series Engines |
| engine | Honeywell International Inc. | TPE331-3 | AIRESEARCH MANUFACTURING COMPANY OF ARIZONA Model TPE331-1, -2, -3, -5, and -6 Series Engines |
| engine | Honeywell International Inc. | TPE331-3U | AIRESEARCH MANUFACTURING COMPANY OF ARIZONA Model TPE331-1, -2, -3, -5, and -6 Series Engines |
| engine | Honeywell International Inc. | TPE331-3UW | AIRESEARCH MANUFACTURING COMPANY OF ARIZONA Model TPE331-1, -2, -3, -5, and -6 Series Engines |
| engine | Honeywell International Inc. | TPE331-3W | AIRESEARCH MANUFACTURING COMPANY OF ARIZONA Model TPE331-1, -2, -3, -5, and -6 Series Engines |
Unsafe Condition
Failure of the propeller pitch control cam follower pin
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Required Actions
Remove propeller pitch control sleeve assembly Part Number 869647-1, -2, or -3 and replace it with a serviceable propeller pitch control sleeve assembly Part Number 869647-4 or later FAA approved sleeve assembly per AiResearch Service Bulletin TPE331-72-0115, or equivalent method approved by the FAA.
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Compliance Time
Within the next 500 hours time in service after April 1, 1978 or prior to September 30, 1979, or at next engine overhaul, whichever comes first
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Affected Aircraft
AiResearch Model TPE331-1, -2, -3, -5, and -6 Series engines
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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