[4910-13-P] 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA-2010-0683; Directorate Identifier 2010-NE-25-AD; Amendment 

39-18065; AD 2015-02-01] 

RIN 2120-AA64 

Airworthiness Directives; Technify Motors GmbH (Type certificate previously held 

by Thielert Aircraft Engines GmbH) Reciprocating Engines 

AGENCY: Federal Aviation Administration (FAA), DOT. 

ACTION: Final rule; request for comments. 

SUMMARY: We are superseding airworthiness directive (AD) 2011-23-01 for all 

Technify Motors GmbH (TMG) models TAE 125-01 and TAE 125-02-99 reciprocating 

engines with certain part number (PIN) and serial number (SIN) clutch assemblies 

installed. AD 2011-23-01 required replacement of certain PIN and SIN clutch assemblies. 

This AD requires the same actions but expands the population of affected PIN and SIN 

clutch assemblies. This AD was prompted by an additional report of a clutch assembly 

that malfunctioned due to disk springs that received a nonconforming heat treatment 

process. We are issuing this AD to prevent failure of the clutch assembly, which could 

lead to failure of the engine, in-flight shutdown, and loss of control of the airplane. 

DATES: This AD is effective [INSERT DATE 15 DAYS AFTER DATE OF 

PUBLICATION IN THE FEDERAL REGISTER]. 
The Director of the Federal Register approved the incorporation by reference of a 

certain publication listed in this AD as of [INSERT DATE 15 DAYS AFTER DATE OF 

PUBLICATION IN THE FEDERAL REGISTER]. 

The Director of the Federal Register approved the incorporation by reference of a 

certain other publication listed in this AD as ofNovember 22, 2011 (76 FR 68636, 

November 7, 2011). 

We must receive any comments on this AD by [INSERT DATE 45 DAYS 

AFTER DATE OF PUBLICATION IN THE FEDERAL REGISTER]. 

ADDRESSES: You may send comments, using the procedures found in 14 CFR 11.43 

and 11.45, by any of the following methods: 

• Federal eRulemaking Portal: Go to http://www.regulations.gov. Follow the 

instructions for submitting comments. 

• Fax: 202-493-2251. 

• Mail: U.S. Department of Transportation, Docket Operations, M-30, West 

Building Ground Floor, Room W12-140, 1200 New Jersey Avenue SE., Washington, DC 

20590. 

• Hand Delivery: U.S. Department of Transportation, Docket Operations, M-30, 

West Building Ground Floor, Room W12-140, 1200 New Jersey Avenue SE., 

Washington, DC 20590, between 9 a.m. and 5 p.m., Monday through Friday, except 

Federal holidays. 

For service information identified in this AD, contact Technify Motors GmbH, 

Platanenstrasse 14, D-09356 Sankt Egidien, Germany; phone: +49-37204-696-0; fax : 

+49-37204-696-55; email: info@centurion-engines.com. You may view this service 

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information at the FAA, Engine & Propeller Directorate, 12 New England Executive 

Park, Burlington, MA. For information on the availability of this material at the FAA, 

call 781-238-7125. 

Examining the AD Docket 

You may examine the AD docket on the Internet at http://www.regulations.gov by 

searching for and locating Docket No. FAA-2010-0683; or in person at the Docket 

Management Facility between 9 a.m. and 5 p.m., Monday through Friday, except Federal 

holidays. The AD docket contains this AD, the mandatory continuing airworthiness 

information, regulatory evaluation, any comments received, and other information. The 

address for the Docket Office (phone: 800-647-5527) is in the ADDRESSES section. 

Comments will be available in the AD docket shortly after receipt. 

FOR FURTHER INFORMATION CONTACT: Christopher McGuire, Aerospace 

Engineer, Engine Certification Office, FAA, Engine & Propeller Directorate, 12 New 

England Executive Park, Burlington, MA 01803; phone: 781-238-7120; fax: (781) 238-

7199; email: Chris.McGuire@faa.gov. 

SUPPLEMENTARY INFORMATION: 

Comments Invited 

This AD is a final rule that involves requirements affecting flight safety, and we 

did not provide you with notice and an opportunity to provide your comments before it 

becomes effective. However, we invite you to send any written data, views, or arguments 

about this AD. Send your comments to an address listed under the ADDRESSES section. 

Include "Docket No. F AA-20 10-0683 ; Directorate Identifier 201 0-NE-25-AD" at the 

beginning of your comments. We specifically invite comments on the overall regulatory, 

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economic, environmental, and energy aspects of this AD. We will consider all comments 

received by the closing date and may amend this AD because of those comments. 

We will post all comments we receive, without change, to 

http://www.regulations.gov, including any personal information you provide. We will 

also post a report summarizing each substantive verbal contact we receive about this AD. 

Discussion 

On August 16, 2010, we issued AD 2010-18-02, Amendment 39-16415 (75 FR 

52240, August 25, 201 0), ("AD 201 0-18-02"), for certain Thielert Aircraft Engines 

GmbH (TAE) (previous certificate holder) models TAE 125-01 and TAE 125-02-99 

reciprocating engines. AD 2010-18-02 resulted from reports of engine in-flight 

shutdowns. Preliminary investigation showed that nonconforming disc springs used in a 

certain production batch of the clutch caused the shutdowns. AD 2010-18-02 required 

replacement of certain clutch assemblies. 

On October 19,2011, we superseded AD 2010-18-02, issuing AD 2011-23-01, 

Amendment 39-16852 (76 FR 68636, November 7, 2011), for certain TAE models TAE 

125-01 and T AE 125-02-99 reciprocating engines. AD 2011-23-01 required replacement 

of certain PIN and SIN clutch assemblies due to clutch failure. AD 2011-23-01 resulted 

from T AE identifying additional clutch assemblies with nonconforming disc springs. 

Actions Since AD 2011-23-01 was Issued 

Since we issued AD 2011-23-01, Amendment 39-16852 (76 FR 68636, 

November 7, 2011 ), we received an additional report of a malfunctioning clutch 

assembly. Investigation found that the same unsafe condition exists on approximately 40 

additional SIN clutch assemblies that have nonconforming disk springs. Those additional 

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nonconforming disc springs are identified in TMG Service Bulletin No. TM TAE 125-

0021, Revision 2, dated October 13, 2014. 

FAA's Determination 

We are issuing this AD because we evaluated all the relevant information and 

determined the unsafe condition described previously is likely to exist or develop in other 

products of these same type designs. 

AD Requirements 

This AD requires, for engines with affected clutch assemblies with more than 100 

hours time since new (TSN), replacement of affected clutch assemblies before further 

flight. This AD also requires, for those engines with affected clutch assemblies that have 

accumulated less than 100 hours TSN, replacement of affected clutch assemblies before 

accumulating 100 hours TSN. 

FAA's Justification and Determination of the Effective Date 

An unsafe condition exists that requires the immediate adoption of this AD. The 

FAA has found that the risk to the flying public justifies waiving notice and comment 

prior to adoption of this rule because TMG identified additional clutch assemblies with 

nonconforming disc springs and the need for operators to comply with some of the AD 

actions before further flight. Therefore, we find that notice and opportunity for prior 

public comment are impracticable and that good cause exists for making this amendment 

effective in less than 30 days. 

Costs of Compliance 

We estimate that this AD will affect about 111 engines installed on airplanes of 

U.S. registry. We also estimate that it will take about 16 hours per engine to perform the 

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clutch assembly replacement. The average labor rate is $85 per hour. Required parts will 

cost about $1 ,796. Based on these figures, we estimate the cost of the AD on U.S. 

operators to be $3 50,316. 

Authority for this Rulemaking 

Title 49 ofthe United States Code specifies the FAA's authority to issue rules on 

aviation safety. Subtitle I, Section 106, describes the authority of the FAA Administrator. 

Subtitle VII, Aviation Programs, describes in more detail the scope ofthe Agency's 

authority. 

We are issuing this rulemaking under the authority described in Subtitle VII, 

Part A, Subpart III, Section 44701, "General requirements." Under that section, Congress 

charges the FAA with promoting safe flight of civil aircraft in air commerce by 

prescribing regulations for practices, methods, and procedures the Administrator finds 

necessary for safety in air commerce. This regulation is within the scope of that authority 

because it addresses an unsafe condition that is likely to exist or develop on products 

identified in this rulemaking action. 

Regulatory Findings 

This AD will not have federalism implications under Executive Order 13132. This 

AD will not have a substantial direct effect on the States, on the relationship between the 

national government and the States, or on the distribution of power and responsibilities 

among the various levels of government. 

For the reasons discussed above, I certify that this AD: 

(1) Is not a "significant regulatory action" under Executive Order 12866, 

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(2) Is not a "significant rule" under DOT Regulatory Policies and Procedures 

( 44 FR 11034, February 26, 1979), 

(3) Will not affect intrastate aviation in Alaska to the extent that it justifies 

making a regulatory distinction, and 

(4) Will not have a significant economic impact, positive or negative, on a 

substantial number of small entities under the criteria of the Regulatory Flexibility Act. 

List of Subjects in 14 CFR Part 39 

Air transportation, Aircraft, Aviation safety, Incorporation by reference, Safety. 

Adoption of the Amendment 

Accordingly, under the authority delegated to me by the Administrator, the FAA 

amends part 39 of the Federal Aviation Regulations (14 CFR part 39) as follows: 

PART 39 -AIRWORTHINESS DIRECTIVES 

1. The authority citation for part 39 continues to read as follows: 

Authority: 49 U.S.C. 106(g), 40113,44701. 

§ 39.13 [Amended] 

2. The FAA amends§ 39.13 by removing airworthiness directive (AD) 2011-23-

01 , Amendment 39-16852 (76 FR 68636, November 7, 2011), and adding the following 

new AD: 

2015-02-01 Technify Motors GmbH (Type Certificate previously held by Thielert 

Aircraft Engines GmbH): Amendment 39-18065; Docket No. FAA-2010-0683; 

Directorate Identifier 201 0-NE-25-AD. 

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(a) Effective Date 

This AD is effective [INSERT DATE 15 DAYS AFTER DATE OF 

PUBLICATION IN THE FEDERAL REGISTER]. 

(b) Affected ADs 

This AD supersedes AD 2011-23-01, Amendment 39-16852 (76 FR 68636, 

November 7, 2011). 

(c) Applicability 

This AD applies to Technify Motors GmbH (TMG) models TAE 125-01 and TAE 

125-02-99 reciprocating engines, with a clutch assembly part number (PIN) listed in 

paragraphs (c)(i) through (c)(v) of this AD, and with a serial number (SIN) listed in either 

TMG Service Bulletin (SB) No. TM TAE 125-0021, Revision 2, dated October 13,2014, 

or Thielert Aircraft Engines GmbH (TAE) SB No. TM TAE 125-1011 P1, Revision 2, 

dated August 31, 2011, installed. 

(i) PIN 02-7210-11001R11 

(ii) PIN 02-7210-11001R11-AT 

(iii) PIN 02-7210-11001R13 

(iv) PIN 05-7211-K006001 

(v) PIN 05-7211-K006002 

(d) Unsafe Condition 

This AD was prompted by TMG identifying 40 additional SIN clutch assemblies 

with nonconforming disk springs for TMG TAE 125-01 reciprocating engines. We are 

issuing this AD to prevent failure of the clutch assembly, which could lead to failure of 

the engine, in-flight shutdown, and loss of control of the airplane. 

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(e) Compliance 

Comply with this AD within the compliance times specified, unless already done. 

After the effective date of this AD: 

(1) For engines with affected clutch assemblies that have accumulated 100 hours 

time since new (TSN) or more, replace the clutch assembly before further flight. 

(2) For engines with affected clutch assemblies that have accumulated less than 

100 hours TSN, replace the clutch assembly before accumulating 100 hours TSN. 

(f) Installation Prohibition 

After the effective date of this AD, do not install onto any airplane any engine 

having a clutch assembly, PIN 02-7210-11001R11, PIN 02-7210-11001Rl1-AT, PIN 02-

7210-11001R13 , PIN 05-7211-K006001 , or PIN 05-7211 - K006002, installed, that has 

an SIN listed in TMG SB No. TM TAE 125-0021 , Revision 2, dated October 13,2014, or 

in T AE SB No. TM T AE 125-1011 P 1, Revision 2, dated August 31, 2011. 

(g) Credit for Previous Actions 

If before the effective date of this AD you replaced an affected clutch assembly 

with a clutch assembly not listed in this AD, or with one not listed in either TMG SB No. 

TM TAE 125-0021 , Revision 2, dated October 13,2014, or TAE SB No. TM TAE 125-

1011 P 1, Revision 2, dated August 31, 2011, then you met the requirements of paragraph 

(e) of this AD and no further action is required to comply with this AD. 

(h) Alternative Methods of Compliance (AMOCs) 

The Manager, Engine Certification Office, may approve AMOCs for this AD. Use 

the procedures found in 14 CFR 39.19 to make your request. You may email your request 

to: ANE-AD-AMOC@faa.gov. 

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(i) Related Information 

(1) For more information about this AD, contact Christopher McGuire, Aerospace 

Engineer, Engine Certification Office, FAA, Engine & Propeller Directorate, 12 New 

England Executive Park, Burlington, MA 01803; phone: 781-238-7120; fax: (781) 238-

7199; email: Chris.McGuire@faa.gov. 

(2) Refer to MCAI European Aviation Safety Agency AD 2014-0232, dated 

October 22, 2014 and corrected on November 4, 2014, for more information. You may 

examine the MCAI in the AD docket on the Internet at http://www.regulations.gov by 

searching for and locating it in Docket No. FAA-2010-0683 . 

U) Material Incorporated by Reference 

(1) The Director of the Federal Register approved the incorporation by reference 

(IBR) of the service information listed in this paragraph under 5 U.S.C. 552(a) and 1 CFR 

part 51. 

(2) You must use this service information as applicable to do the actions required 

by this AD, unless the AD specifies otherwise. 

(3) The following service information was approved for IBR on [INSERT DATE 

15 DAYS AFTER DATE OF PUBLICATION IN THE FEDERAL REGISTER]. 

(i) Technify Motors GmbH (TMG) Service Bulletin (SB) No. TM T AE 125-0021 , 

Revision 2, dated October 13, 2014. 

(ii) Reserved. 

(4) The following service information was approved for IBR on November 22, 

2011. 

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(i) Thielert Aircraft Engines GmbH (TAE) SB No. TM TAE 125-1011 P1 , 

Revision 2, dated August 31, 2011. 

(ii) Reserved. 

(5) For TMG and TAE service information identified in this AD, contact Technify 

Motors GmbH, Platanenstrasse 14, D-09356 Sankt Egidien, Germany; phone: +49-

3 7204-696-0; fax : +49-3 7204-696-55 ; email: info@centurion-engines.com. 

( 6) You may view this service information at FAA, Engine & Propeller 

Directorate, 12 New England Executive Park, Burlington, MA. For information on the 

availability of this material at the FAA, call 781-238-7125. 

(7) You may view this service information at the National Archives and Records 

Administration (NARA). For information on the availability of this material at NARA, 

call 202-741-6030, or go to: http://www.archives.gov/federal-register/cfr/ibrlocations.html. 

Issued in Burlington, Massachusetts, on January 8, 2015. 

Colleen M. D' Alessandro, 

Assistant Directorate Manager, Engine & Propeller Directorate, 

Aircraft Certification Service. 

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