AD 94-26-07
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Honeywell International Inc. | TPE331-10 | AlliedSignal Inc. TPE331 Series Turboprop Engines |
| engine | Honeywell International Inc. | TPE331-10A | AlliedSignal Inc. TPE331 Series Turboprop Engines |
| engine | Honeywell International Inc. | TPE331-10B | AlliedSignal Inc. TPE331 Series Turboprop Engines |
| engine | Honeywell International Inc. | TPE331-10G | AlliedSignal Inc. TPE331 Series Turboprop Engines |
| engine | Honeywell International Inc. | TPE331-10GR | AlliedSignal Inc. TPE331 Series Turboprop Engines |
| engine | Honeywell International Inc. | TPE331-10J | AlliedSignal Inc. TPE331 Series Turboprop Engines |
| engine | Honeywell International Inc. | TPE331-10N | AlliedSignal Inc. TPE331 Series Turboprop Engines |
| engine | Honeywell International Inc. | TPE331-10R | AlliedSignal Inc. TPE331 Series Turboprop Engines |
| engine | Honeywell International Inc. | TPE331-10U | AlliedSignal Inc. TPE331 Series Turboprop Engines |
| engine | Honeywell International Inc. | TPE331-10UA | AlliedSignal Inc. TPE331 Series Turboprop Engines |
Unsafe Condition
Excessive wear of the internal fuel control drive splines in fuel controls (Part Numbers 897770-1 through -8 and 897780-1 through -11) can result in loss of fuel control governor drive, leading to uncommanded engine thrust or torque changes, uncontained turbine separation, or loss of aircraft control.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Amend the Emergency Procedures section of the FAA Approved Airplane Flight Manual (AFM) to include conditions and procedures for engine shutdown. Conduct initial and repetitive dimensional inspections of fuel control drive shaft splines for wear, or replace affected fuel controls with alternate fuel controls per specified service bulletins.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Effective April 18, 1995, except for those who received the priority letter AD 94-26-07 on December 13, 1994, which was immediately effective.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
AlliedSignal Inc. (now Honeywell International Inc.) TPE331-3, -5, -6, -10, -11U, and -12 series turboprop engines with fuel control assembly Part Numbers 897770-1 through -8 and 897780-1 through -11.
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.