EASA AD No : 2010-0020 

EASA Form 110 Page 1/2 

EASA AIRWORTHINESS DIRECTIVE 

AD No.: 2010-0020 

Date: 08 February 2010 

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) : 

TAE125-01 engines 

TCDS Number : EASA E.055 

Foreign AD : Not applicable 

Supersedure : None. 

ATA 72 Engine - Blow-by Oil Separator - Replacement

Manufacturer(s): Thielert Aircraft Engines GmbH. 

Applicability: 

TAE125-01, all serial numbers, unless already equipped with blow-by oil 

separator P/N 02-7250-18310R1, 02-7250-18310R2, 02-7250-18100R6, 02-

7250-18100R7. 

These engines are known to be installed on, but not limited to, Diamond DA 

40, Cessna C172 and Piper PA28. 

Engines installed on Diamond Aircraft Industries DA 42 and DA 42M aircraft 

are not affected. 

Reason: 

Service experience has shown that the small outlet of the blow-by separators 

P/N 02-7250-18100R1, 02-7250-18100R2, 02-7250-18100R3, 02-7250-

18100R4, 02-7250-18300R1, 02-7250-18300R2, 02-7250-18300R3, 02-

7250-18300R4, 02-7250-18300R5 may cause a blow-by gas pressure 

increase inside the crankcase of the engine in excess of the oil seal design 

pressure limits. Leaking engine oil may adversely affect the gearbox clutch or 

the engine lubrication system. This condition, if not corrected, could lead to 

in-flight cases of engine power loss or ultimately shut down. 

To address and correct this situation, TAE has developed a blow-by 

separator of larger diameter and published the Service Bulletin (SB) TM TAE 

125-0019 for the installation of the improved blow-by oil separator. 

For the reasons described above, this AD requires the accomplishment of the 

corrective actions in accordance with SB TM TAE 125-0019. 
EASA AD No : 2010-0020 

EASA Form 110 Page 2/2 

Effective Date: 22 February 2010 

Required action(s) 

and Compliance 

Time(s): 

Required as indicated, unless accomplished previously: 

Within the next 110 flight hours after the effective date of this AD, replace the 

blow-by oil separator in accordance with SB TM TAE125-0019. 

Ref. Publication: 

Thielert Aircraft Engines SB TM TAE125-0019 initial issue dated 12 

November 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 08 January 2010 as PAD 10-007 for consultation 

until 05 February 2010. 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