# Proposed AD 97-CE-45-AD: Pilatus Aircraft Ltd. Models PC-12 and PC-12/45 Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 98-04-16
- Action: Notice of proposed rulemaking (NPRM).
- Published: October 6, 1997, 62 FR 52055
- Comments due: November 7, 1997
- Became: [AD 98-04-16](https://openairdocs.org/ad/98-04-16)
- Docket: 97-CE-45-AD
- FR document: 97-26411
- Official PDF: https://openairdocs.org/files/sha256/9e/60/9e60f7437e07c3c54b8f61fd76a56e2d029bab48d8d19741312a16412fc9030b (from https://www.govinfo.gov/content/pkg/FR-1997-10-06/pdf/97-26411.pdf)
- Federal Register: https://www.federalregister.gov/documents/1997/10/06/97-26411/airworthiness-directives-pilatus-aircraft-ltd-models-pc-12-and-pc-1245-airplanes
- Page: https://openairdocs.org/proposed/97-CE-45-AD

## Summary

This document proposes to adopt a new airworthiness directive (AD) that would apply to certain Pilatus Aircraft Ltd. (Pilatus) Models PC-12 and PC-12/45 airplanes. The proposed action would require inspecting the aileron tie-rod jam nuts for looseness, tightening any loose jam nuts, and installing a locking sleeve on both ends of the aileron tie-rod in the chain-drive of the aileron system. The proposed AD results from an incident where the aileron tie-rod jam nuts on the chain-drive of the aileron system became loose. This caused a differential of aileron control between the pilot's control wheel and the co-pilot's control wheel. The actions specified by the proposed AD are intended to prevent such aileron control differential caused by the aileron tie-rod jam nuts becoming loose, which could result in loss of aileron control and consequent loss of control of the airplane.

## Notices in this docket

- Oct 6, 1997: Notice of proposed rulemaking (NPRM). (first notice), FR document 97-26411, comments due Nov 7, 1997 (https://www.federalregister.gov/documents/1997/10/06/97-26411/airworthiness-directives-pilatus-aircraft-ltd-models-pc-12-and-pc-1245-airplanes)

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