# Proposed AD FAA-2008-0991: Diamond Aircraft Industries GmbH Model DA 42 Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Comment period closed
- Products: Diamond
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: September 17, 2008, 73 FR 53766
- Comments due: October 17, 2008
- Docket: FAA-2008-0991 (https://www.regulations.gov/docket/FAA-2008-0991, where comments are filed)
- Project: 2008-CE-054-AD
- FR document: E8-21701
- Official PDF: https://openairdocs.org/files/sha256/c7/0c/c70cf6b72b6be9fc3125ffaada73d8941db9ac5012b53cd24254de1660fc2ff9 (from https://www.govinfo.gov/content/pkg/FR-2008-09-17/pdf/E8-21701.pdf)
- Federal Register: https://www.federalregister.gov/documents/2008/09/17/E8-21701/airworthiness-directives-diamond-aircraft-industries-gmbh-model-da-42-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/E415090D32D6AD92862574C700545E47.0001
- Page: https://openairdocs.org/proposed/FAA-2008-0991

## 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:

In-service experience indicates that the powder coating of the rear right hand (RH) engine support bracket degrades over time, leading to a reduced torque of the engine mountings bolts. In some cases, bolts had fully unscrewed and fell into the engine cowling. One case was reported where the pilot had to shut down an engine in flight because of a failed V-belt, the cause of failure assumed to be one of these bolts. This condition, if not corrected, may lead to further cases of loose bolts and subsequent damage to the engine or accessories in the engine compartment, possibly resulting in in- flight engine shut-down and reduced control of theaircraft.

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 E8-21701, comments due Oct 17, 2008 (https://www.federalregister.gov/documents/2008/09/17/E8-21701/airworthiness-directives-diamond-aircraft-industries-gmbh-model-da-42-airplanes)

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