AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final rule.

SUMMARY: We are superseding an existing airworthiness directive (AD)
for certain TCM and R-RM series reciprocating engines. That AD
currently requires replacement of certain magnetos if they fall within
the specified serial number (S/N) range, inspection of the removed
magneto to verify that the stop pin is still in place, and, if the stop
pin is not in place, inspection of the engine gear train, crankcase,
and accessory case. This new AD corrects the range of S/Ns affected,
requires the same replacement and inspections, and adds R-RM C-125, C-
145, O-300, IO-360, TSIO-360, and LTSIO-520-AE series reciprocating
engines to the applicability. This AD was prompted by our awareness of
an error in the previous AD applicability in the range of magneto S/Ns
affected and of the need to include certain engines made by R-RM, under
license of TCM. We are issuing this AD to prevent engine failure and
loss of control of the airplane due to migration of the magneto impulse
coupling stop pin out of the magneto frame and into the gear train of
the engine.

DATES: This AD is effective January 24, 2012.

ADDRESSES: For service information identified in this AD, contact
Teledyne Continental Motors, Inc., PO Box 90, Mobile, AL 36601; phone:
251-438-3411, or go to http://tcmlink.com/servicebulletins.cfm. You may
review copies of the referenced service information at the FAA, Engine
& Propeller Directorate, 12 New England Executive Park, Burlington, MA
01803. 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;
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 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: Juanita Craft, Aerospace Engineer,
Atlanta Certification Office, FAA, Small Airplane Directorate, 1701
Columbia Avenue, College Park, Georgia 30337; phone: (404) 474-5584;
fax: (404) 474-5606; email: juanita.craft@faa.gov.

SUPPLEMENTARY INFORMATION:

Discussion

We issued a notice of proposed rulemaking (NPRM) to amend 14 CFR
part 39 to supersede AD 2002-13-04, amendment 39-12792 (67 FR 43230,
June 27, 2002). That AD applies to the specified products. The NPRM
published in the Federal Register on June 28, 2011 (76 FR 37682). That
NPRM proposed to continue to require replacement of certain magnetos if
they fall within the specified S/N range, inspection of the removed
magneto to verify that the stop pin is still in place, and, if the stop
pin is not in place, inspection of the engine gear train, crankcase,
and accessory case. That NPRM also proposed to correct the range of S/
Ns affected and add R-RM C-125, C-145, O-300, IO-360, TSIO-360, and
LTSIO-520-AE series reciprocating engines to the applicability. We are
issuing this AD to prevent engine failure and loss of control of the
airplane due to migration of the magneto impulse coupling stop pin out
of the magneto frame and into the gear train of the engine.

Comments

We gave the public the opportunity to participate in developing
this AD. The following presents the comment received on the proposal
and the FAA's response to this comment.

Question on Who the AD Is Written Against

A commenter, not further identified, asked why the AD was issued
against TCM and not ``Slick.''
We do not agree. We write ADs against either a product or an
appliance. In the case of this AD, magnetos are part of the engine type
certificate and, therefore, considered part of the product (the
engine). We did not change the AD as a result of this comment.

Conclusion

We reviewed the relevant data, considered the comment received, and
determined that air safety and the public interest require adopting the
AD as proposed.

Costs of Compliance

We estimate that this AD affects 100 R-RM C-125, C-145, O-300, IO-
360, TSIO-360, and LTSIO-520-AE series reciprocating engines installed
on airplanes of U.S. registry. We also estimate that it will take about
2 work-hours per engine to perform the inspections, and that the
average labor rate is $85 per work-hour. Based on these figures, we
estimate the total cost of this AD to U.S. operators to be $17,000. Our
cost estimate is exclusive of possible warranty coverage.

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.

Regulatory Findings

We have 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 that this AD:
(1) Is not a ``significant regulatory action'' under Executive
Order 12866,
(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, 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 removing airworthiness directive (AD)
2002-13-04, Amendment 39-12792 (67 FR 43230, June 27, 2002), and adding
the following new AD: