AD 79-12-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Honeywell International Inc. | TPE331-10 | AIRESEARCH MANUFACTURING COMPANY OF ARIZONA Model TPE 331-10-501G Engines |
Unsafe Condition
Failure of the forged third stage turbine wheel blade could result in total loss of power of one or more engines during a single flight.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Remove the forged third stage turbine wheel (Part Number 3101516-1) and replace it with a cast third stage turbine wheel (Part Number 3102655-1) within specified operating hours. Compliance must follow existing maintenance instructions, with alternative actions possible if approved.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within the next 10 operating hours time in service after May 10, 1979, for at least one engine per airplane, and within the next 50 operating hours time in service after May 10, 1979, for all affected engines.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
AiResearch Model TPE 331-10-501G engines with forged third stage turbine wheel (Part Number 3101516-1), installed on Swearingen Merlin IIIB airplanes listed in the AD's engine and airplane serial number pairs.
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.