# Proposed AD FAA-2007-28955: 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: August 27, 2007, 72 FR 48948
- Comments due: September 26, 2007
- Docket: FAA-2007-28955 (https://www.regulations.gov/docket/FAA-2007-28955, where comments are filed)
- Project: 2007-CE-067-AD
- FR document: E7-16891
- Official PDF: https://openairdocs.org/files/sha256/6d/25/6d2572ef6bcbc805c3a5c4d7fd50ca16e1c95c1c7896c4ac003d68e2748eb9aa (from https://www.govinfo.gov/content/pkg/FR-2007-08-27/pdf/E7-16891.pdf)
- Federal Register: https://www.federalregister.gov/documents/2007/08/27/E7-16891/airworthiness-directives-diamond-aircraft-industries-gmbh-model-da-42-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/69B9699334BFCF81862573440047D47E.0001
- Page: https://openairdocs.org/proposed/FAA-2007-28955

## 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:

Recently, a double in-flight engine shut down incident occurred on a DA42 aircraft equipped with TAE125-01 engines. The BFU (German Accident Investigation Body) found the root cause to be a violation of the Airplane Flight Manual procedures (taking-off with an insufficiently charged main aircraft battery) and momentary low voltage in the electrical system of the aircraft when retracting the main landing gear. This has been the subject of Diamond Service Information (SI) 42-040 and a subsequent EASA Safety Information Notice, SIN 2007-08, issued on 18 April 2007.

The TAE125-01 and TAE125-02-99 engines, approved for installation on the DA42, are FADEC (Full Authority Digital Engine Control) controlled and are not totally independent from the aircraft electrical power supply. A significant drop of the voltage causes simultaneously a reset of the FADEC on both engines with subsequent feathering of the propeller blades. In the case of an empty battery this scenario may be considered as catastrophic at the aircraft level.

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

## Notices in this docket

- Aug 26, 2007: Notice of proposed rulemaking (NPRM).
----------------------------------------------------------------------- (first notice), comments due Sep 25, 2007 (https://drs.faa.gov/browse/excelExternalWindow/AB7D875B662959298625734400548642.0001)
- Aug 27, 2007: Notice of proposed rulemaking (NPRM)., FR document E7-16891, comments due Sep 26, 2007 (https://www.federalregister.gov/documents/2007/08/27/E7-16891/airworthiness-directives-diamond-aircraft-industries-gmbh-model-da-42-airplanes)

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