# Proposed AD FAA-2009-0509: PILATUS Aircraft Ltd. Model PC-7 Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Comment period closed
- Products: Pilatus
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: June 5, 2009, 74 FR 26994
- Comments due: July 6, 2009
- Docket: FAA-2009-0509 (https://www.regulations.gov/docket/FAA-2009-0509, where comments are filed)
- Project: 2009-CE-029-AD
- FR document: E9-13139
- Official PDF: https://openairdocs.org/files/sha256/88/a0/88a0fc7d1613f4486d4a95067376dbd438ae77a736b2b687619d448dd9fc526c (from https://www.govinfo.gov/content/pkg/FR-2009-06-05/pdf/E9-13139.pdf)
- Federal Register: https://www.federalregister.gov/documents/2009/06/05/E9-13139/airworthiness-directives-pilatus-aircraft-ltd-model-pc-7-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/29F0AD5B7F496988862575CC0049790F.0001
- Page: https://openairdocs.org/proposed/FAA-2009-0509

## 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 reported corrosion on the bolts and in the bores of the attachment fittings for the engine mounting frame. The corrosion is caused by damaged cadmium plating of the bolts or damaged surface finish of the attachment fitting. Such a condition, if left uncorrected, could lead to crack initiation at the bolt and the fitting bore and subsequently to the failure of the engine attachment fitting.

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

## Notices in this docket

- Jun 5, 2009: Notice of proposed rulemaking (NPRM). (first notice), FR document E9-13139, comments due Jul 6, 2009 (https://www.federalregister.gov/documents/2009/06/05/E9-13139/airworthiness-directives-pilatus-aircraft-ltd-model-pc-7-airplanes)

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