# Proposed AD FAA-2008-0990: Pilatus Aircraft Ltd. Model PC-6 Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Comment period closed
- Products: Pilatus
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: September 17, 2008, 73 FR 53764
- Comments due: October 17, 2008
- Docket: FAA-2008-0990 (https://www.regulations.gov/docket/FAA-2008-0990, where comments are filed)
- Project: 2008-CE-060-AD
- FR document: E8-21691
- Official PDF: https://openairdocs.org/files/sha256/d3/8c/d38c949b0d0e2ebc80b275cb1700d6ce7fcfd6bfafb3cfb0c8e096ef0544a57e (from https://www.govinfo.gov/content/pkg/FR-2008-09-17/pdf/E8-21691.pdf)
- Federal Register: https://www.federalregister.gov/documents/2008/09/17/E8-21691/airworthiness-directives-pilatus-aircraft-ltd-model-pc-6-series-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/896661124ED933D4862574C700545E71.0001
- Page: https://openairdocs.org/proposed/FAA-2008-0990

## Summary

We propose to adopt a new airworthiness directive (AD) for the products listed above. This proposed AD results from mandatory continuing airworthiness information (MCAI) originated by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as:

This Airworthiness Directive (AD) is prompted by a potential problem with the freedom of the brake pedals of some PC-6 series aircraft. The freedom of the brake pedals could be prevented because of an insufficient clearance between the rudder bar lugs on a few aircraft. In such conditions, it is possible that the master brake cylinder is not re-filled with the fluid from the reservoir, which can lead to a degradation of brake effectiveness. Mostly during landing, this can lead to difficulties with the directional control of the aircraft on ground and could cause a runway excursion.

The proposed AD would require actions that are intended to address the unsafe condition described in the MCAI.

## Notices in this docket

- Sep 17, 2008: Notice of proposed rulemaking (NPRM). (first notice), FR document E8-21691, comments due Oct 17, 2008 (https://www.federalregister.gov/documents/2008/09/17/E8-21691/airworthiness-directives-pilatus-aircraft-ltd-model-pc-6-series-airplanes)

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