AD Amdt-39-9459
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Textron | Various | Airworthiness Directives; AlliedSignal, Inc. (formerly Textron Lycoming) Models LTS101-650B1, -750B1, -650C, and -750C Turboshaft Engines |
Unsafe Condition
Additional bearing failures and uncontained PT disk failures have been reported since AD 88-14-01, including one uncontained PT disk failure. These failures could lead to PT overspeed and uncontained engine 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 and an electronic PT rotor overspeed controller as a terminating action to the currently required inspections of AD 88-14-01.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Before further flight
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.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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