Document ID: chunk:federal_register_of_legislation:F2007L04359:body:0:p2
Version: federal_register_of_legislation:F2007L04359
Segment Type: other
Provision Reference: 
Character Range: 2853–5239

November 2007) refers.

Compliance:  For Requirements 1 through 3 - Within the next 200 hours time in service after the effective date of the original issue of this Directive, but not later than 30 November 2007, whichever occurs first.
             This Amendment becomes effective on 16 November 2007.
Background:  Recently, a double in-flight engine shut down incident occurred on a DA42 aircraft equipped with TAE125-01 engines.  The Bundesstelle für Flugunfalluntersuchung (German Federal Bureau of Aircraft Accident Investigation) found the root cause to be a violation of the AFM 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 dated 9 March 2007.
             The TAE125-01 and TAE125-02-99 engines, approved for installation on the DA42, are full authority digital engine control (FADEC) controlled and are not totally independent from the aircraft electrical power supply.  A significant drop of the voltage caused a simultaneously reset of the FADEC on both engines with subsequent feathering of the propeller blades.  Thielert Aircraft Engines (TAE) Installation Manuals IM-02-01 Issue 4 and IM-02-02 Issue 1 have been revised to address this issue.
             The original issue of this Directive mandated the installation of additional ECU backup batteries to supply electrical power to the ECU, preventing high transient power drains from causing a short term voltage drop when their insufficient charge in the main battery.  The Directive also required the incorporation of AFM and AMM TRs.
             Amendment 1 continued the requirements of the original issue of this Directive but allows compliance in accordance with later EASA approved revisions of the requirement documents.
             This Amendment continues the requirements of Amendment 1 but introduces an optional alternate method of compliance as approved by the EASA and extends compliance by an additional 100 hours time in service until 30 November 2007.
             The original issue of this Directive became effective on 27 July 2007.
             This Amendment becomes effective on 7 September 2007.

David Punshon
Delegate of the Civil Aviation Safety Authority

13 November 2007