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EASA AIRWORTHINESS DIRECTIVE 

AD No.: 2008-0016 R1 

Date: 22 February 2008 

Type Approval Holder’s Name: 

Thielert Aircraft Engines

Type/Model designation(s): 

TAE125-01 engines 

TCDS Numbers: EASA E.055 

Foreign AD: Not applicable 

Revision: This Airworthiness Directive (AD) revises and replaces AD 2008-0016, including the 

‘Correction’ thereof, both dated 22 January 2008. 

ATA 79 Engine Oil System – Piston Cooling Nozzles – Inspection 

Manufacturer: Thielert Aircraft Engines 

Applicability: TAE125-01 engines, all serial numbers, except engines that have been modified 

in accordance with TAE Design Modification No. 2007-001. 

These engines are known to be installed on, but not limited to, Cessna 172 and 

(Reims-built) F172 series (EASA STC Nr. EASA.A.S.01527); Piper PA-28 series 

(EASA STC Nr. EASA.A.S.01632), APEX (Robin) DR 400 series (EASA STC 

Nr. EASA.A.S.01380); and Diamond DA40 and DA42 aircraft. 

Reason: In-flight engine shutdown incidents were reported on aircraft equipped with 

TAE125-01 engines. This was found to be mainly the result of operation over a 

long time period with broken piston cooling oil nozzles which caused thermal 

overload of the piston. 

Consequently, the German Federal Bureau for the investigation of 

transportation accidents (BFU) issued Safety Recommendation no. 10/2007. 

For the reasons stated above, this Airworthiness Directive (AD) requires the 

inspection of all affected TAE125-01. 

This AD has been revised to exclude engines that have been modified in 

accordance with TAE Design Modification No. 2007-001. Thielert Aircraft 

Engines (TAE) Service Bulletin (SB) TM TAE125-0017 has been updated to 

Revision 2, dated 22 February 2008, and now includes an approved alternative 

inspection method. 

Effective Date: 05 February 2008 

Compliance Required as indicated, unless accomplished previously: 
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(1) Within the next 110 Flight Hours (FH) or 6 months or during the next 

scheduled maintenance, whichever occurs first after the effective date of 

this directive, inspect the piston cooling nozzle in accordance with the 

instructions of Thielert Aircraft Engines TM TAE125-0017; 

(2) Thereafter, at intervals not to exceed 100 FH (+/- 10 FH), inspect the piston 

cooling nozzle in accordance with the instructions of Thielert Aircraft 

Engines TM TAE125-0017; 

(3) When a broken piston cooling nozzle is found during any inspection as 

required by paragraph (1) or (2) of this AD, contact TAE, do not operate the 

engine anymore and send it back to TAE. 

Ref. Publications: Thielert Service Bulletin TM TAE125-0017 dated 14 December 2007. 

The use of later approved revisions of this document is acceptable for 

compliance with the requirements of this AD. 

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

Methods of Compliance for this AD. 

2. The original issue of this AD was posted on 21 December 2007 as PAD 07-

230 for consultation until 18 January 2008. The Comment Response 

Document can be found at http://ad.easa.europa.eu/ . 

3. Enquiries regarding this AD should be referred to the AD Focal Point - 

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

4. For any questions concerning the content of 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