# Proposed AD FAA-2008-0649: DG Flugzeugbau GmbH Model DG-500MB Powered Sailplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2008-17-08
- Products: DG Flugzeugbau
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
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- Published: June 17, 2008, Federal Register: June 18, 2008
- Comments due: July 13, 2008
- Became: [AD 2008-17-08](https://openairdocs.org/ad/2008-17-08)
- Docket: FAA-2008-0649 (https://www.regulations.gov/docket/FAA-2008-0649, where comments are filed)
- Project: 2008-CE-038-AD
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/7F3EBCBA495D2BC88625746C006FBBE8.0001
- Page: https://openairdocs.org/proposed/FAA-2008-0649

## 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:

A DG-500MB experienced, after the engine shutdown, an uncommanded retraction of its powerplant. Investigations revealed that some bolts of the extension retraction mechanism had fractured because of fatigue stress due to increasing push-pull loads acting on incorrectly tightened screws. This condition, if not corrected, could lead to damage of the propeller and the fuselage, thereby reducing the structural integrity of the sailplane.

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

## Notices in this docket

- Jun 13, 2008: Notice of proposed rulemaking (NPRM). (first notice), FR document E8-13324, comments due Jul 14, 2008 (https://www.federalregister.gov/documents/2008/06/13/E8-13324/airworthiness-directives-dg-flugzeugbau-gmbh-model-dg-500mb-powered-sailplanes)
- Jun 17, 2008: Notice of proposed rulemaking (NPRM).
-----------------------------------------------------------------------, comments due Jul 13, 2008 (https://drs.faa.gov/browse/excelExternalWindow/7F3EBCBA495D2BC88625746C006FBBE8.0001)

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