AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final rule.

SUMMARY: We are adopting a new airworthiness directive (AD) for
Hamilton Standard Division model 6/5500/F and 24PF and Hamilton
Sundstrand Corporation model 14RF, 14SF, 247F, and 568F series
propellers. This AD was prompted by the amount of corrosion detected
during major inspections (MI). This AD requires incorporating
inspections, based on a calendar time, into the propeller maintenance
schedule. We are issuing this AD to prevent corrosion that could result
in propeller failure and loss of airplane control.

DATES: This AD is effective September 19, 2013.

ADDRESSES: The Docket Operations office is located at Docket Management
Facility, U.S. Department of Transportation, 1200 New Jersey Avenue
SE., West Building Ground Floor, Room W12-140, Washington, DC 20590-
0001.
For service information identified in this AD, contact Hamilton
Sundstrand Corporation, One Hamilton Road, Mail Stop 1A-3-C63, Windsor
Locks, CT 06096-1010; or Hamilton Standard Division, One Hamilton Road,
United Technologies Corporation, Mail Stop 1A-3-C63, Windsor Locks, CT
06096-1010; phone: 877-808-7575; fax: 860-660-0372; email:
tech.solutions@hs.utc.com; Internet: http://myhs.hamiltonsundstrand.com.
You may view this 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 street address for
the Docket Office (phone: 800-647-5527) is provided in the ADDRESSES
section. Comments will be available in the AD docket shortly after
receipt.

FOR FURTHER INFORMATION CONTACT: Michael Schwetz, Aerospace Engineer,
Boston Aircraft Certification Office, FAA, 12 New England Executive
Park, Burlington, MA 01803; phone: 781-238-7761; fax: 781-238-7170;
email: michael.schwetz@faa.gov.

SUPPLEMENTARY INFORMATION:

Discussion

We issued a notice of proposed rulemaking (NPRM) to amend 14 CFR
part 39 to include an AD that would apply to the specified products.
The NPRM published in the Federal Register on May 23, 2013 (78 FR
30795). The NPRM proposed to require incorporating inspections, based
on a calendar time, into the propeller maintenance schedule.

Comments

We gave the public the opportunity to participate in developing
this AD. We received no comments on the NPRM (78 FR 30795, May 23,
2013) or on the determination of the cost to the public.

Conclusion

We reviewed the relevant data and determined that air safety and
the public interest require adopting this AD as proposed except for
minor editorial changes. We have determined that these minor changes:
Are consistent with the intent that was proposed in the
NPRM (78 FR 30795, May 23, 2013) for correcting the unsafe condition;
and
Do not add any additional burden upon the public than was
already proposed in the NPRM (78 FR 30795, May 23, 2013).

Costs of Compliance

We estimate that this AD affects about 1,044 propeller/hub
combinations installed on airplanes of U.S. registry. We also estimate
that it will take about 160 hours per propeller to perform one MI. The
average labor rate is $85 per hour. Based on these figures, we estimate
the cost of this AD on U.S. operators to be $14,198,400.

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

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 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):