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 b y EASA, acting in accordance with Regulation (EC) No 216/2008 on behalf of the Europe an 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 en sured by accomplishing any applicable ADs. Conseque ntly, no person may operate an aircraft to which an AD applies, except in accordance with the requirements of that AD unle ss otherwise specified by the Agency [EC 2042/2003 Annex I, Part M.A.303] or agre ed 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 equip ped 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, 02-7250-18100 R3, 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 exce ss of the oil seal design pressure limits. Leaking engine oil may adversely a ffect the gearbox clutch or the engine lubrication system. This condition, if n ot corrected, could lead to in-flight cases of engine power loss or ultimately shut down.
To address and correct this situation, TAE has deve loped a blow-by separator of larger diameter and published the Serv ice Bulletin (SB) TM TAE 125-0019 for the installation of the improved blow- by oil separator. For the reasons described above, this AD requires t he 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 previous ly: Within the next 110 flight hours after the effectiv e date of this AD, replace the blow-by oil separator in accordance with SB TM TAE1 25-0019.

Ref. Publication: Thielert Aircraft Engines SB TM TAE125-0019 initial issue dated 12 November 2008. The use of later approved revisions of these docume nts is acceptable for compliance with the requirements of this AD.

Remarks : 1. If requested and appropriately substantiated, EA SA 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 d uring the consultation period. 3. Enquiries regarding this AD should be referred t o the Airworthiness Directives, Safety Management & Research Section, C ertification Directorate, EASA. E-mail ADs@easa.europa.eu

. 4. For any question concerning the technical conten t 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