[4910-13-P]

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2015-1383; Directorate Identifier 2015-NE-15-AD; Amendment 

39-18293; AD 2015-21-01]

RIN 2120-AA64

Airworthiness Directives; Technify Motors GmbH Reciprocating Engines

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final rule.

SUMMARY: We are adopting a new airworthiness directive (AD) for all Technify 

Motors GmbH TAE 125-02 reciprocating engines with a dual mass flywheel installed. 

This AD requires installation of a start phase monitoring system and associated specified 

software. This AD was prompted by reports of a gearbox drive shaft breaking during 

starting or restarting of the engine. We are issuing this AD to prevent overload and failure

of the gearbox drive shaft, which could result in failure of the engine, in-flight shutdown, 

and loss of control of the airplane.

DATES: This AD becomes effective [INSERT DATE 35 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 35 DAYS AFTER DATE OF 

PUBLICATION IN THE FEDERAL REGISTER].
ADDRESSES: 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 29125; email: info@centurion-engines.com; and Diamond Aircraft 

Industries GmbH, N. A. Otto-Strasse 5, 2700 Wiener Neustadt, Austria; phone: +43 2622 

26700; fax: +43 2622 26700 1369; email: airworthiness@diamond-air.at. You may view 

this service 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. It is also available on the Internet at 

http://www.regulations.gov by searching for and locating Docket No. FAA-2015-1383.

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-2015-1383; 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 (MCAI), the regulatory evaluation, any comments received, and other 

information. The address for the Docket Office (phone: 800-647-5527) is Document 

Management Facility, U.S. Department of Transportation, Docket Operations, M-30, 

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

Washington, DC 20590.

FOR FURTHER INFORMATION CONTACT: Robert Green, Aerospace Engineer, 

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

Executive Park, Burlington, MA 01803; phone: 781-238-7754; fax: 781-238-7199; email: 

robert.green@faa.gov.

2
SUPPLEMENTARY INFORMATION:

Discussion

We issued a notice of proposed rulemaking (NPRM) to amend 14 CFR part 39 by 

adding an AD that would apply to the specified products. The NPRM was published in 

the Federal Register on July 8, 2015 (80 FR 38990). The NPRM proposed to correct an 

unsafe condition for the specified products. The MCAI states:

Cases of a broken gearbox drive shaft have been reported on 

aeroplanes equipped with TAE 125-02 engines that have a Dual 

Mass Flywheel installed.

Investigations results showed a possible overload of the gearbox 

drive shaft during starting of the engine or during restarting of the 

engine in-flight.

This condition, if not corrected, could lead to engine power loss 

during flight, possibly resulting in loss of control of the aeroplane.

Comments

We gave the public the opportunity to participate in developing this AD. We 

received no comments on the NPRM (80 FR 38990, July 8, 2015).

Conclusion

We reviewed the available data and determined that air safety and the public 

interest require adopting this AD as proposed.

Related Service Information under 1 CFR Part 51

Technify Motors GmbH has issued Service Bulletin No. SB TMG 125-1018 P1, 

Revision 1, dated February 5, 2015. The service information describes procedures for 

installing a start phase monitoring system and associated specified software mapping on 

particular airplane models. This service information is reasonably available because the 

3
interested parties have access to it through their normal course of business or by the 

means identified in the ADDRESSES section of this final rule.

Other Related Service Information

Technify Motors GmbH has also issued Technify Motors SB No. TM TAE 000-

0007, Revision 28, dated February 5, 2015; Technify Motors Installation Manual No. IM02-02, Issue 4, Revision 2, dated January 30, 2015, with Chapter 02-IM-13-02, section 

13.8.16, Revision 1, dated November 28, 2014; Technify Motors SB No. SB TMG 601-

1007 P1, Revision 3, dated February 5, 2015; and Technify Motors SB No. SB TMG 

651-1004 P1, Revision 2, dated February 5, 2015. Diamond Aircraft Industries GmbH 

(DAI) has issued DAI Mandatory Service Bulletin (MSB) No. 42-109/1, dated February 

4, 2015; and DAI MSB No. 42-007/16, dated February 4, 2015. The service information 

describes procedures for installing a start phase monitoring system and associated 

specified software mapping.

Costs of Compliance

We estimate that this AD affects 97 engines installed on airplanes of U.S. registry. 

We also estimate that it will take about 3 hours per engine to comply with this AD. The 

average labor rate is $85 per hour. For 13 of the engines, required parts cost about $285

per engine. For 84 of the engines, required parts cost about $206 per engine. Based on 

these figures, we estimate the cost of this AD on U.S. operators to be $45,744.

Authority for This Rulemaking

Title 49 of the 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.

4
“Subtitle VII: Aviation Programs,” describes in more detail the scope of the 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

We determined that 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 this AD:

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

(2) Is not a “significant rule” under the 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.

5
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 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 adding the following new airworthiness directive 

(AD):

2015-21-01 Technify Motors GmbH (Type Certificate Previously Held by Thielert 

Aircraft Engines GmbH): Amendment 39-18293; Docket No. FAA-2015-1383; 

Directorate Identifier 2015-NE-15-AD.

(a) Effective Date

This AD becomes effective [INSERT DATE 35 DAYS AFTER DATE OF 

PUBLICATION IN THE FEDERAL REGISTER].

(b) Affected ADs

None.

(c) Applicability

This AD applies to Technify Motors GmbH TAE 125-02-99 (commercial 

designation CD-135, formerly Centurion 2.0) and TAE 125-02-114 (commercial 

6
designation CD-155, formerly Centurion 2.0S) reciprocating engines, with a dual mass 

flywheel installed.

(d) Reason

This AD was prompted by reports of a gearbox drive shaft breaking during 

starting or restarting of the engine. We are issuing this AD to prevent overload and failure 

of the gearbox drive shaft, which could lead to failure of the engine, in-flight shutdown, 

and loss of control of the airplane.

(e) Actions and Compliance

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

Within 110 flight hours or at the next scheduled inspection after the effective date 

of this AD, whichever occurs first, install a start phase monitoring system and software 

mapping. Use Technify Motors Service Bulletin (SB) No. SB TMG 125-1018 P1, 

Revision 1, dated February 5, 2015, to do the installation.

(f) Installation Prohibition

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

Motors TAE 125-02-99 or TAE 125-02-114 reciprocating engine that is not equipped 

with a start phase monitoring system and software mapping.

(g) 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.

7
(h) Related Information

(1) For more information about this AD, contact Robert Green, Aerospace 

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

England Executive Park, Burlington, MA 01803; phone: 781-238-7754; fax: 781-238-

7199; email: robert.green@faa.gov.

(2) Refer to MCAI European Aviation Safety Agency AD 2015-0055, dated 

March 31, 2015, for more information. You may examine the MCAI in the AD docket on 

the Internet at http://www.regulations.gov/#!documentDetail;D=FAA-2015-1383-0002.

(3) Technify Motors SB No. TM TAE 000-0007, Revision 28, dated February 5, 

2015; Technify Motors Installation Manual No. IM-02-02, Issue 4, Revision 2, dated 

January 30, 2015, with Chapter 02-IM-13-02, section 13.8.16, Revision 1, dated 

November 28, 2014; Technify Motors SB No. SB TMG 601-1007 P1, Revision 3, dated 

February 5, 2015; and Technify Motors SB No. SB TMG 651-1004 P1, Revision 2, dated 

February 5, 2015, which are not incorporated by reference in this AD, can be obtained 

from Technify Motors GmbH, using the contact information in paragraph (i)(3) of this 

AD.

(4) Diamond Aircraft Industries GmbH (DAI) MSB No. 42-109/1, dated February 

4, 2015; and DAI MSB No. 42-007/16, dated February 4, 2015, which are not 

incorporated by reference in this AD, can be obtained from Diamond Aircraft Industries 

GmbH, using the contact information in paragraph (h)(5) of this AD. 

(5) For DAI service information identified in this AD, contact Diamond Aircraft 

Industries GmbH, N. A. Otto-Strasse 5, 2700 Wiener Neustadt, Austria; phone: +43 2622 

26700; fax: +43 2622 26700 1369; email: airworthiness@diamond-air.at.

8
(6) You may view this service 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.

(i) 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.

(i) Technify Motors Service Bulletin (SB) No. SB TMG 125-1018 P1, Revision 1, 

dated February 5, 2015.

(ii) Reserved.

(3) For Technify Motors GmbH 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.

(4) 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.

(5) 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.

9
Issued in Burlington, Massachusetts, on October 6, 2015.

Ann C. Mollica,

Acting Directorate Manager, Engine & Propeller Directorate,

Aircraft Certification Service.

10