AD Amdt-39-9979
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Textron | Various | Airworthiness Directives; AlliedSignal Inc. T5311, T5313, T5317, and T53 (Military) Series Engines |
| aircraft | Aviat | Various | Airworthiness Directives; AlliedSignal Inc. T5311, T5313, T5317, and T53 (Military) Series Engines |
Unsafe Condition
Separation of the N2 spur gear nut retainer (lock cup) could result in uncommanded engine acceleration due to N2 accessory drive assembly disengagement.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Remove and replace the N2 spur gear nut retainer (lock cup).
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Before further flight
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Affected Aircraft
AlliedSignal Inc. (formerly Textron Lycoming) T5311, T5313, T5317, and T53 series military engines approved for installation on aircraft certified under Section 21.25 of the FAR.
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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