EASA AD No : 2008-0145 

EASA Form 110 Page 1/2 

EASA AIRWORTHINESS DIRECTIVE 

AD No.: 2008-0145 

Date: 01 August 2008 

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 AD applies, except in accordance with the requirements of that AD 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 engines 

TCDS Number : EASA.E.055 

Foreign AD : Not applicable 

Supersedure : This AD supersedes EASA AD 2008-0130 dated 15 July 2008. 

ATA 61 Propellers – Propeller Control Valve – Replacement (Life Limit) 

Manufacturer(s): Thielert Aircraft Engines GmbH. 

Applicability: TAE125-01 and TAE125-02-99 engines, all serial numbers, if installed on 

Diamond Aircraft Industries Model DA 42 aircraft. 

Reason: 

In-flight engine shutdown incidents have been reported on Diamond Aircraft 

Industries DA 42 aircraft equipped with TAE125 engines. Preliminary 

investigations showed that it was mainly the result of failure of the propeller 

control valve. This condition, if not corrected, could lead to further cases of 

engine in-flight shutdown, possibly resulting in reduced control of the aircraft. 

EASA AD 2008-0130 has been published to require implementation of a life 

limit of 300 flight hours (FH) for the Proportional Pressure Reducing Valve 24V 

(propeller control valve) Part Number (P/N) NM-0000-0124501 on TAE125-01 

engines and replacement of propeller control valves that have exceeded the 

established life limit. The same P/N valve is also installed on TAE125-02-99 

engines. 

As this problem has only manifested itself on those engines, as installed on 

Diamond Aircraft Industries DA 42 aircraft, any TAE125-01 and TAE125-02-99 

engines installed on other aircraft are not affected. 

For the reasons stated above, this EASA AD retains the requirements of AD 

2008-0130, which is superseded, and expands the applicability to include 

TAE125-02-99 engines on Diamond DA 42 aircraft that have the affected valve 

installed. 

Effective Date: 15 August 2008 
EASA AD No : 2008-0145 

EASA Form 110 Page 2/2 

Required Action(s) 

and Compliance 

Time(s): 

Required as indicated, unless accomplished previously: 

(1) For TAE125-01 engines, initially replace the propeller control valve 

P/N NM-0000-0124501 in accordance with the instructions of Thielert 

Aircraft Engines (TAE) Service Bulletin (SB) TM TAE125-0018 at the time 

indicated in Table 1 below: 

Table 1 

Gearbox accumulated 

time since new: 

Compliance time: 

More than 400 FH 55 FH or during the next 

scheduled maintenance, 

whichever occurs first after 

29 July 2008, the effective date of 

AD 2008-0130. 

Less than 400 FH Upon accumulating 300 FH (first 

scheduled maintenance), or within 

110 FH, whichever occurs later 

after 29 July 2008, the effective 

date of AD 2008-0130. 

(2) For TAE125-02-99 engines, initially replace the propeller control valve 

P/N NM-0000-0124501 in accordance with the instructions of TAE SB TM 

TAE125-1007 P1 at the time indicated in Table 2 below: 

Table 2 

Gearbox accumulated 

time since new: 

Compliance time: 

More than 400 FH 55 FH or during the next 

scheduled maintenance, 

whichever occurs first after the 

effective date of this AD 

Less than 400 FH Upon accumulating 300 FH (first 

scheduled maintenance), or within 

110 FH, whichever occurs later 

after the effective date of this AD 

(3) After compliance with paragraph (1) or (2) of this AD, as applicable to 

engine model, at intervals not to exceed 300 FH, replace the propeller 

control valve P/N NM-0000-0124501 in accordance with the instructions of 

TAE SB TM TAE125-0018 or SB TM TAE125-1007 P1, as applicable. 

Ref. Publication: 

Thielert Aircraft Engines SB TM TAE125-0018 dated 19 June 2008 and 

TM TAE125-1007 P1 dated 11 July 2008. 

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. This AD was posted on 16 July 2008 as PAD 08-082 for consultation until 

30 July 2008. No comments were received during the consultation period. 

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 GmbH, Platanenstraße 14 

D-09350 Lichtenstein, Germany 

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

E-mail info@centurion-engines.com