# Airworthiness Directives; AlliedSignal Inc. T5311, T5313, T5317, and T53 (Military) Series Engines
> **Rule** · Final rule. · Published 1997-04-25 · Effective 1997-06-24 · 62 FR 20100
## Document
- **Document number:** 97-10766
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 62 FR 20100
- **Publication date:** 1997-04-25
- **Effective date:** 1997-06-24
- **FAA docket:** Docket No. 96-ANE-25
## Abstract

This amendment adopts a new airworthiness directive (AD), applicable to AlliedSignal Inc. (formerly Textron Lycoming) T5311, T5313, T5317, and T53 series military engines approved for installation on aircraft certified in accordance with Section 21.25 of the Federal Aviation Regulations (FAR), that requires removal and replacement of the N2 spur gear nut retainer (lock cup). This amendment is prompted by reports of N2 spur gear nut retainer (lock cup) separation. The actions specified by this AD are intended to prevent N2 accessory drive assembly disengagement due to N2 spur gear nut retainer (lock cup) separation, which could result in an uncommanded engine acceleration.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1997/04/25/97-10766/airworthiness-directives-alliedsignal-inc-t5311-t5313-t5317-and-t53-military-series-engines)
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