AD 95-08-14
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Honeywell International Inc. | LTS101-650B-1 | Airworthiness Directives; AlliedSignal, Inc. (formerly Textron Lycoming) LTS101 Series Turboshaft Engines |
| engine | Honeywell International Inc. | LTS101-650C-3 | Airworthiness Directives; AlliedSignal, Inc. (formerly Textron Lycoming) LTS101 Series Turboshaft Engines |
| engine | Honeywell International Inc. | LTS101-650C-3A | Airworthiness Directives; AlliedSignal, Inc. (formerly Textron Lycoming) LTS101 Series Turboshaft Engines |
| engine | Honeywell International Inc. | LTS101-750B-1 | Airworthiness Directives; AlliedSignal, Inc. (formerly Textron Lycoming) LTS101 Series Turboshaft Engines |
| engine | Honeywell International Inc. | LTS101-750C-1 | Airworthiness Directives; AlliedSignal, Inc. (formerly Textron Lycoming) LTS101 Series Turboshaft Engines |
Unsafe Condition
Improper sensor polarity of magnetic speed pickups in the engine electronic overspeed protection system can result in a malfunctioning system despite normal self-test indications, leading to failure to arrest uncontrolled power turbine (PT) rotor overspeed and potential aircraft damage.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Within 150 hours time in service after the AD's effective date, either replace magnetic speed pickups (P/N 4-301-356-01) with serviceable parts per SB LTS101-73-10-0169, or inspect pickups for polarity, remove those with incorrect polarity, and replace them prior to further flight. Uninstalled pickups must also be inspected and replaced if necessary.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 150 hours time in service after the effective date of this AD
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Affected Aircraft
AlliedSignal, Inc. (formerly Textron Lycoming) Models LTS101-650B1, -750B1, -650C3/3A, and -750C1 turboshaft engines with electronic overspeed protection systems installed in production or retrofitted per specified service bulletins.
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
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