# Proposed AD FAA-2011-0811: Diamond Aircraft Industries Powered Sailplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2011-21-16
- Products: Diamond Aircraft Industries
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: August 8, 2011, 76 FR 48047
- Comments due: September 22, 2011
- Became: [AD 2011-21-16](https://openairdocs.org/ad/2011-21-16)
- Docket: FAA-2011-0811 (https://www.regulations.gov/docket/FAA-2011-0811, where comments are filed)
- Project: 2011-CE-026-AD
- FR document: 2011-20038
- Official PDF: https://openairdocs.org/files/sha256/68/81/6881b007765e417a4514735fba19e2d29a4e78c4c460f33df11df9aab364c18d (from https://www.govinfo.gov/content/pkg/FR-2011-08-08/pdf/2011-20038.pdf)
- Federal Register: https://www.federalregister.gov/documents/2011/08/08/2011-20038/airworthiness-directives-diamond-aircraft-industries-powered-sailplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/49ABFD31C4366960862578E6004A83D8.0001
- Page: https://openairdocs.org/proposed/FAA-2011-0811

## Summary

We propose to adopt a new airworthiness directive (AD) for Diamond Aircraft Industries Model H-36 "DIMONA'' powered sailplanes. 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:

A report has been received of a failed air brake control system torsion tube on a Diamond (formerly Hoffman) H 36 powered sailplane. The results of the subsequent investigation show that the failure was due to corrosion damage.

This condition, if not detected and corrected, may lead to failure of the air brake control system in flight, resulting in reduced control of the aeroplane.

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

## Notices in this docket

- Aug 8, 2011: Notice of proposed rulemaking (NPRM). (first notice), FR document 2011-20038, comments due Sep 22, 2011 (https://www.federalregister.gov/documents/2011/08/08/2011-20038/airworthiness-directives-diamond-aircraft-industries-powered-sailplanes)

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