# Proposed AD FAA-2010-0849: PILATUS Aircraft Ltd. Model PC-7 Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2010-22-09
- Products: Pilatus
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: August 26, 2010, 75 FR 52482
- Comments due: October 12, 2010
- Became: [AD 2010-22-09](https://openairdocs.org/ad/2010-22-09)
- Docket: FAA-2010-0849 (https://www.regulations.gov/docket/FAA-2010-0849, where comments are filed)
- Project: 2010-CE-043-AD
- FR document: 2010-21182
- Official PDF: https://openairdocs.org/files/sha256/0a/0c/0a0c223b8e8b49168d4f84f2fdacf0748b14a0393c8282ed69fc0333f5f02098 (from https://www.govinfo.gov/content/pkg/FR-2010-08-26/pdf/2010-21182.pdf)
- Federal Register: https://www.federalregister.gov/documents/2010/08/26/2010-21182/airworthiness-directives-pilatus-aircraft-ltd-model-pc-7-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/314495710A6D6CB88625778B004C7A80.0001
- Page: https://openairdocs.org/proposed/FAA-2010-0849

## 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 due to an occurrence when an aircraft had a partial in-flight separation of the aileron outboard bearing support. The aileron outboard bearing supports are attached with two forward attachment bolts and two aft attachment bolts. The forward attachment bolts are approximately 3.2 mm (0.125 inch) longer than the aft attachment bolts. If the aileron outboard bearing supports have been removed, it is possible that during the reinstallation of the aileron outboard bearing supports, the attachment bolts can be installed in wrong positions. Bolts that are installed in wrong positions can damage the threads in the rear attachment anchor nuts. Such a condition, if left uncorrected, could lead to in-flight separation of the aileron outboard bearing support, and as a consequence, the loss or limited controllability of the aircraft. The proposed AD would require actions that are intended to address the unsafe condition described in the MCAI.

## Notices in this docket

- Aug 26, 2010: Notice of proposed rulemaking (NPRM). (first notice), FR document 2010-21182, comments due Oct 12, 2010 (https://www.federalregister.gov/documents/2010/08/26/2010-21182/airworthiness-directives-pilatus-aircraft-ltd-model-pc-7-airplanes)

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