AD/Thielert/13 Engine/Propeller Constant Speed Unit Propeller Control Valve (Cth)
AIRWORTHINESS DIRECTIVE
For the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.001(1) of CASR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.
Thielert Piston Engines
| AD/THIELERT/13 | Engine/Propeller - Constant Speed Unit - Propeller Control Valve | 9/2009 |
Applicability: | Thielert Aircraft Engines GmbH (TAE) 125-02-99 engines installed on Diamond Aircraft (DA) Industries Model DA 42 and DA 42 M aircraft. |
Requirement: | Install the Proportional Pressure Reducing Valve 24V (Propeller Control Valve) Part Number (P/N) 05-7212-E002801 and the Vibration Isolator P/N 05-7212-K022302 in accordance with Service Bulletin/Techniche Mittellung (TM) TAE 125-1007 P1 Note 1: Vibration Isolator and Proportional Pressure Reducing Valve (Propeller Control Valve) are part of the Gearbox assembly. The Gearbox, and thus Vibration Isolator and Proportional Pressure Reducing Valve, has to be inspected regularly in accordance with the Operation and Maintenance Manual (OM) OM-02-02 and Repair Manual (RM) RM-02-02. The use of later approved revisions of these documents is acceptable for compliance with the requirements of this AD. Note 2: EASA AD 2009-0151 refers. |
Compliance: | Within 110 flight hours from the effective date of this AD unless previously accomplished. |
| This Airworthiness Directive becomes effective on 27 August 2009. | |
Background: | In-flight engine shutdown incidents have been reported on Diamond Aircraft Industries DA 42 aircraft equipped with TAE125 engines. The investigations showed that it was mainly the result of failure of the Proportional Pressure Reducing Valve (Propeller Control Valve) due to high vibration. This condition, if not corrected, could lead to further cases of engine in-flight shutdown, possibly resulting in reduced control of the aircraft. |
James Coyne
Delegate of the Civil Aviation Safety Authority
17 July 2009
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