AD 76-16-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Honeywell International Inc. | TPE331-1 | AIRESEARCH MANUFACTURING COMPANY OF ARIZONA Model TPE331 Series Engines |
| engine | Honeywell International Inc. | TPE331-1U | AIRESEARCH MANUFACTURING COMPANY OF ARIZONA Model TPE331 Series Engines |
| engine | Honeywell International Inc. | TPE331-1UA | 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. | TPE331-2U | AIRESEARCH MANUFACTURING COMPANY OF ARIZONA Model TPE331 Series Engines |
| engine | Honeywell International Inc. | TPE331-2UA | AIRESEARCH MANUFACTURING COMPANY OF ARIZONA Model TPE331 Series Engines |
| engine | Honeywell International Inc. | TPE331-3 | 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. | TPE331-3W | AIRESEARCH MANUFACTURING COMPANY OF ARIZONA Model TPE331 Series Engines |
Unsafe Condition
Fatigue failures of the high speed pinion (HSP) bearing oil transfer tube, supply tube, and lubricating adapter, and loosening of the HSP bearing carrier bolts could occur.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace HSP bearing carrier bolts with specified parts, inspect torque on bolts securing lube nozzle and adapter, inspect oil transfer tube bracket for cracks, replace oil transfer tube if cracked or separated, replace aluminum lubricating adapter with steel version, and install new lockplate if bolts are loose. Follow Service Bulletin TPE331-72-0092 revisions.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within specified intervals: 100 hours time in service after December 30, 1974; 200 hours time in service after AD effective date; before accumulating 1800 hours time in service after December 30, 1974; and recurring inspections at intervals not exceeding 200 hours time in service.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
AIRESEARCH MANUFACTURING COMPANY OF ARIZONA Model TPE331 series engines in Groups A, B, and C, including specific serial numbers and engines modified per Service Bulletin TPE331-72-0064.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.