DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2017-0241; Product Identifier 2017-NE-09-AD; Amendment
39-19045; AD 2017-19-15]
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 certain
Technify Motors GmbH TAE 125-02 reciprocating engines. This AD requires
replacement of the clutch with a dual mass flywheel. This AD was
prompted by a loss of engine power in flight caused by oil leaking from
the gearbox radial shaft sealing ring that contaminated the clutch. We
are issuing this AD to correct the unsafe condition on these products.

DATES: This AD becomes effective October 31, 2017.
The Director of the Federal Register approved the incorporation by
reference of a certain publication listed in this AD as of October 31,
2017.

ADDRESSES: For service information identified in this final rule,
contact Technify Motors GmbH, Platanenstrasse 14, D-09356 Sankt
Egidien, Germany; phone: +49 37204 696 0; fax: +49 37204 696 29125;
email: engines.com">info@centurion-engines.com. You may view this service
information at the FAA, Engine and Propeller Standards Branch, 1200
District Avenue, 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-2017-0241.

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-2017-
0241; 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, ECO
Branch, FAA, 1200 District Avenue, Burlington, MA 01803; phone: 781-
238-7754; fax: 781-238-7199; email: robert.green@faa.gov.

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 May 5, 2017 (82 FR
21144). The NPRM proposed to correct an unsafe condition for the
specified products. The mandatory continuing airworthiness information
(MCAI) states:

A temporary power loss occurred during flight on a TAE 125-02-
powered aeroplane. Following investigation, it was determined that
an improper lapping of the gearbox driveshaft led to insufficient
sealing of the gearbox radial shaft sealing ring, eventually
resulting in oil leakage and oil contamination of the clutch.
This condition, if not detected and corrected, could lead to
permanent engine power loss, possibly resulting in reduced control
of the aeroplane.

You may obtain further information by examining the MCAI in the AD
docket on the Internet at http://www.regulations.gov by searching for
and locating Docket No. FAA-2017-0241.

Comments

We gave the public the opportunity to participate in developing
this AD. We received no comments on the NPRM or on the determination of
the cost to the public.

Revision to Economic Estimate

We corrected the estimate of work hours from 0 in the NPRM to 4 in
this final rule. This revision increases the estimate of the cost per
product from $5,805 in the NPRM to $6,145 in this final rule. The total
cost was correctly estimated at $24,580 in the NPRM and is therefore
unchanged in this final rule.

Conclusion

We reviewed the relevant data and determined that air safety and
the public interest require adopting this final rule as proposed except
for minor editorial changes and the minor revisions to the costs of
compliance section noted above. We have determined that these minor
changes:
Are consistent with the intent that was proposed in the
NPRM for correcting the unsafe condition; and
Do not add any additional burden upon the public than was
already proposed in the NPRM.

Related Service Information Under 1 CFR Part 51

Technify Motors GmbH has issued Service Bulletin (SB) No. SB TMG
125-1020 P1, Initial Issue, dated January 27, 2016. The SB describes
procedures for replacing the clutch with a dual mass flywheel. This
service information is reasonably available because the interested
parties have access to it through their normal course of business or by
the means identified in the ADDRESSES section.

Costs of Compliance

We estimate that this AD affects 4 engines installed on airplanes
of U.S. registry.
We estimate the following costs to comply with this AD:


Estimated Costs

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. ``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.
This AD is issued in accordance with authority delegated by the
Executive Director, Aircraft Certification Service, as authorized by
FAA Order 8000.51C. In accordance with that order, issuance of ADs is
normally a function of the Compliance and Airworthiness Division, but
during this transition period, the Executive Director has delegated the
authority to issue ADs applicable to engines, propellers, and
appliances to the Manager, Engine and Propeller Standards Branch,
Policy and Innovation Division.

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.

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.

Sec. 39.13 [Amended]

2. The FAA amends Sec. 39.13 by adding the following new airworthiness
directive (AD):