EASA AD No : 2009-0224 

EASA Form 110 Page 1/2 

 

EASA AIRWORTHINESS DIRECTIVE 

AD No.: 2009-0224 

Date: 20 October 2009 

Note: This Airworthiness Directive (AD) is issued by EASA, acting in accordance with 

Regulation (EC) No 216/2008 on behalf of the European Community, its Member States 

and of the European third countries that participate in the activities of EASA under Article 

66 of that Regulation. 

This AD is issued in accordance with EC 1702/2003, Part 21A.3B. In accordance with EC 2042/2003 Annex I, Part M.A.301, the 

continuing airworthiness of an aircraft shall be ensured by accomplishing any applicable ADs. Consequently, no person may 

operate an aircraft to which an Airworthiness Directive applies, except in accordance with the requirements of that Airworthiness 

Directive unless otherwise specified by the Agency [EC 2042/2003 Annex I, Part M.A.303] or agreed with the Authority of the 

State of Registry [EC 216/2008, Article 14(4) exemption]. 

Type Approval Holder’s Name : 

Thielert Aircraft Engines GmbH

Type/Model designation(s) : 

TAE125-02-99 engines 

TCDS Number : EASA.E.055 

Foreign AD : Not applicable 

Supersedure: This AD supersedes EASA AD 2009-0151, dated 10 July 2009. 

ATA 61 Engine/Propeller – Constant Speed Unit – Propeller Control 

Valve – Vibration Isolator - Installation

Manufacturer(s): Thielert Aircraft Engines GmbH. 

Applicability: TAE125-02-99 engines, all serial numbers, if installed on Diamond Aircraft 

Industries Model DA 42 and DA 42 M aircraft.

Reason: 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. 

As this problem has only manifested itself on these engines installed on 

Diamond Aircraft Industries DA 42 aircraft, TAE125-02-99 engines 

installed on other aircraft are not affected. 

In addition to the information stated above, it has been found out that 

failure of the electrical connection to the Proportional Pressure Reducing 

Valve 24V (Propeller Control Valve) Part Numbers (P/N) NM-0000-

0124501 and 05-7212-K021401 contributed to power loss events or IFSD. 

To address and correct this situation, Thielert Aircraft Engines GmbH has 

published TM TAE 125-1009 P1, providing instructions for installation of 

the Vibration Isolator P/N 05-7212-K022302 that reduces the vibration 

level on the Proportional Pressure Reducing Valve. For preventing failures 
EASA AD No : 2009-0224 

EASA Form 110 Page 2/2 

 

of the valve’s electrical connection, a new Proportional Pressure Reducing 

Valve 24V (Propeller Control Valve) Part Number (P/N) 05-7212-E002801 

has been introduced by TM TAE 125-1007 P1 Revision 2. 

For the reasons described above, EASA AD 2009-0151 required the 

installation of the Vibration Isolator and the new Proportional Pressure 

Reducing Valve 24V (Propeller Control Valve). This AD supersedes AD 

2009-0151, retaining the requirements and reducing the compliance time 

from 110 to 55 flight hours. 

Effective Date: 03 November 2009 

Required Action(s) 

and Compliance 

Time(s): 

Required as indicated unless already accomplished: 

Within 55 flight hours from the effective date of this AD, at the next 

inspection or until 31 January 2010, whichever occurs first, 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 TM TAE 125-1007 P1 Rev. 2 and 

TM TAE 125-1009 P1 Revision 3. 

Installations done in accordance with previous issues of TM TAE 125-

1009 P1 are acceptable for compliance with the requirements of this AD. 

Note: 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 OM-02-02 and RM-02-02. 

Ref. Publications: Thielert Service Bulletin TM TAE125-1009 P1 Rev. 3 dated 14 October 

2009.

Thielert Service Bulletin TM TAE125-1007 P1 Rev. 2 dated 29 April 2009. 

Thielert Service Bulletin TM TAE125-1009 P1 dated 07 July 2009. 

Engine Operation & Maintenance Manual OM-02-02 Issue 1 Rev. 7 dated 

17 June 2009. 

Engine Repair Manual RM-02-02 Issue 1 Rev. 15 dated 29 April 2009. 

The use of later approved revisions of these documents is acceptable for 

compliance with the requirements of this AD. 

Remarks : 1. If requested and appropriately substantiated, EASA can approve 

Alternative Methods of Compliance for this AD. 

2. The required actions and the risk allowance have granted the 

issuance of a Final AD with Request for Comments, postponing the 

public consultation process after publication. 

3. Enquiries regarding this AD should be referred to the Airworthiness 

Directives, Safety Management & Research Section, Certification 

Directorate, EASA. E-mail ADs@easa.europa.eu.

4. For any question concerning the technical content of the requirements 

in this AD, please contact: 

Thielert Aircraft Engines 

Platanenstraße 14 

D-09350 Lichtenstein, Germany 

Telephone +49-37204-696-0; Fax +49-37204-696-55; 

E-mail info@centurion-engines.com