EASA AD No.: 2011-0087-E 

EASA Form 111 Page 1/3

EASA EMERGENCY AIRWORTHINESS DIRECTIVE 

AD No.: 2011-0087-E 

Date: 12 May 2011 

Note: This Emergency 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) : 

TAE 125 engines 

TCDS Number : EASA.E.055 

Foreign AD : Not applicable 

Supersedure : None 

ATA 72 Engine – Friction Disk – Replacement 

Manufacturer(s): Thielert Aircraft Engines GmbH 

Applicability: TAE 125-02-99 (commercial designation Centurion 2.0) and TAE 125-02-114 

(commercial designation Centurion 2.0S), all serial numbers. 

These engines are known to be installed on, but not limited to, the following 

aeroplane types, mostly through application of a Supplemental Type Certificate 

(STC): 

- Cessna 172 and (Reims-built) F172 series (STC EASA.A.S.01527), 

- Piper PA-28 series (STC EASA.A.S.01632), 

- CEAPR (APEX, Robin) DR 400 series (STC EASA.A.S.01380), and 

- Diamond DA 40 and DA 42 series. 

Reason: In-flight engine shutdown incidents have been reported on aeroplanes equipped 

with TAE 125 engines. 

Preliminary investigations showed that it was mainly the result of the sensitivity 

of friction disk Part Number (P/N) 05-7211-K010201 against possible 

misalignment of gearbox and core engine during assembly. 

This condition, if not corrected, could result in further cases of engine in-flight 

shutdown and consequent loss of control of the aeroplane. 

To address this unsafe condition, Thielert Aircraft Engines GmbH have 

developed a new friction disk. 

For the reasons described above, this AD requires replacement of affected 

friction disk(s) by new friction disk P/N 05-7211-K012301. 

Effective Date: 16 May 2011 
EASA AD No.: 2011-0087-E 

EASA Form 111 Page 2/3

Required Action(s) 

and Compliance 

Time(s): 

Required as indicated, unless accomplished previously: 

(1) Within the compliance time(s) indicated in table 1 and 2 of this AD, 

depending on aeroplane and clutch installed on engine(s) configuration, as 

applicable, replace the friction disk(s) P/N 05-7211-K010201 with P/N 

05-7211-K012301 in accordance with the instructions of Thielert Aircraft 

Engines (TAE) Service Bulletin (SB) TM TAE 125-0013 P1. 

Table 1 – Single engine aeroplanes 

Flight Hours (FH) 

accumulated by the clutch at 

the effective date of this AD 

Compliance time for friction disk 

replacement 

100 FH or more Within 10 FH after the effective date 

of this AD 

Less than 100 FH Upon accumulating 100 FH or within

10 FH after the effective date of this 

AD, whichever occurs later 

Table 2 – Twin engine aeroplanes 

Engines configuration and FH 

accumulated by the clutches 

at the effective date of this AD 

Compliance time for friction disk(s) 

replacement 

Only one of the 2 clutches 

affected, irrespective of FH 

accumulated 

Upon accumulating 300 FH by the 

clutch 

2 clutches are affected and both 

clutches have accumulated 

more than 100 FH 

Within 10 FH after the effective date 

of this AD for the clutch that has 

accumulated more FH, and upon 

accumulating 300 FH for the other 

clutch 

2 clutches are affected and one 

of the two clutches has 

accumulated less than 100 FH 

Upon accumulating 100 FH or within 

the next 10 FH after the effective date 

of this AD, whichever occurs later, for 

the clutch that has accumulated more 

FH, and upon accumulating 300 FH 

for the other clutch 

(2) After modification of an engine as required by paragraph (1) of this AD, do 

not install a friction disk P/N 05-7211-K010201 on that engine. 

(3) From the effective date of this AD, do not install a TAE 125-02-99 or TAE 

125-02-114 engine equipped with a friction disk P/N 05-7211-K010201 on 

an aeroplane. 

Ref. Publications: Thielert Aircarft Engines GmbH Service Bulletin TM TAE 125-1013 P1 dated 10 

May 2011. 

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 approve Alternative 

Methods of Compliance for this AD. 
EASA AD No.: 2011-0087-E 

EASA Form 111 Page 3/3

2. The safety assessment has requested not to implement the full consultation 

process and an immediate publication and notification. 

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, Federal 

Republic Germany; telephone +49-37204-696-0; fax +49-37204-696- 2912; 

E-mail info@centurion-engines.com