AD 95-26-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Honeywell International Inc. | LTS101-650B-1 | Airworthiness Directives; AlliedSignal, Inc. (formerly Textron Lycoming) Models LTS101-650B1, -750B1, -650C, and -750C Turboshaft Engines |
| engine | Honeywell International Inc. | LTS101-650C | Airworthiness Directives; AlliedSignal, Inc. (formerly Textron Lycoming) Models LTS101-650B1, -750B1, -650C, and -750C Turboshaft Engines |
| engine | Honeywell International Inc. | LTS101-750B-1 | Airworthiness Directives; AlliedSignal, Inc. (formerly Textron Lycoming) Models LTS101-650B1, -750B1, -650C, and -750C Turboshaft Engines |
| engine | Honeywell International Inc. | LTS101-750C-1 | Airworthiness Directives; AlliedSignal, Inc. (formerly Textron Lycoming) Models LTS101-650B1, -750B1, -650C, and -750C Turboshaft Engines |
Unsafe Condition
Power turbine (PT) overspeed and uncontained engine failure due to bearing failures resulting in PT shaft disengagement from the gear train drive or No. 4 bearing failure followed by power pinion gear teeth failure.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Install an improved power turbine (PT) rotor with retention capability and an electronic PT rotor overspeed controller. Terminate the inspections required by AD 88-14-01 after installation.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
At the next shop visit when the PT rotor is removed after the effective date of this AD (April 22, 1996), but prior to December 31, 1997.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
AlliedSignal, Inc. (formerly Textron Lycoming) Models LTS101-650B1, -750B1, -650C, and -750C turboshaft engines installed on Bell Helicopter Textron 222 series and MBB BK117 series helicopters.
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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