AD 74-24-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| 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
Fatigue failure of the pin in the propeller pitch control sleeve assembly.
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Required Actions
Inspect the propeller pitch control sleeve assembly per Paragraph 2.B. or perform the vibration test per paragraph 2.C. of AiResearch Service Bulletin TPE331-72-0087, Rev. 1, or later FAA-approved revisions. Replace the hydraulic turbine bearing support mount retainer per paragraph 2.D. of the same service bulletin. Equivalent procedures may be approved by the FAA.
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Compliance Time
Within the next 25 hours time in service after receipt of this airmail letter (for engines with <100 hours time in service) or within the next 300 hours time in service (for engines with >100 hours time in service). For new/overhauled engines: before placing in service.
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Affected Aircraft
AiResearch Model TPE331-3U, TPE331-3UW, TPE331-5, TPE331-6 engines with specific serial ranges: TPE331-3U-303G (S/N 03127-03173, 03176); TPE331-3UW-303G (S/N 05031-05042); TPE331-5-251C (S/N 22007-22045, 22047-22050); TPE331-5-251K (S/N 06227-06238, 06240-06418, 06420-06435); TPE331-6-251M (S/N 20267-20437, 20439-20468, 20470-20478). Also includes engines modified with Service Bulletin TPE331-72-0055.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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