DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2015-8129; Directorate Identifier 2014-NM-197-AD;
Amendment 39-18573; AD 2016-13-09]
RIN 2120-AA64

Airworthiness Directives; Bombardier, Inc. Airplanes

AGENCY: Federal Aviation Administration (FAA), Department of
Transportation (DOT).

ACTION: Final rule.

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SUMMARY: We are adopting a new airworthiness directive (AD) for certain
Bombardier, Inc. Model CL-600-2B16 (CL-604 Variant) airplanes. This AD
was prompted by a determination that certain maintenance tasks for the
horizontal stabilizer trim actuator (HSTA) are inadequate. This AD
requires revising the maintenance or inspection program, as applicable,
to incorporate new airworthiness limitations for the HSTA. We are
issuing this AD to detect and correct premature wear and cracking of
the HSTA, which could result in failure of the HSTA and consequent loss
of control of the airplane.

DATES: This AD becomes effective August 16, 2016.
The Director of the Federal Register approved the incorporation by
reference of certain publications listed in this AD as of August 16,
2016.

ADDRESSES: For service information identified in this final rule,
contact Bombardier, Inc., 400 C[ocirc]te-Vertu Road West, Dorval,
Qu[eacute]bec H4S 1Y9, Canada; Widebody Customer Response Center, toll-
free telephone 1-866-538-1247, or direct dial telephone 1-514-855-2999;
fax 1-514-855-7401; email ac.yul@aero.bombardier.com; Internet http://www.
bombardier.com. You may view this referenced service information at
the FAA, Transport Airplane Directorate, 1601 Lind Avenue SW., Renton,
WA. For information on the availability of this material at the FAA,
call 425-227-1221. It is also available on the Internet at http://www.regulations.
gov by searching for and locating Docket No. FAA-2015-8129.

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-
8129; 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 Operations office
(telephone 800-647-5527) is in the ADDRESSES section.

FOR FURTHER INFORMATION CONTACT: Cesar Gomez, Aerospace Engineer,
Airframe and Mechanical Systems Branch, ANE-171, FAA, New York Aircraft
Certification Office, 1600 Stewart Avenue, Suite 410, Westbury, NY
11590; telephone 516-228-7318; fax 516-794-5531.

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 certain Bombardier, Inc.
Model CL-600-2B16 (CL-604 Variant) airplanes. The NPRM published in the
Federal Register on January 4, 2016 (81 FR 32) (``the NPRM''). The NPRM
was prompted by a determination that certain maintenance tasks for the
HSTA are inadequate. The NPRM proposed to require revising the
maintenance or inspection program, as applicable, to incorporate new
airworthiness limitations for the HSTA. We are issuing this AD to
detect and correct premature wear and cracking of the HSTA, which could
result in failure of the HSTA and consequent loss of control of the
airplane.
Transport Canada Civil Aviation (TCCA), which is the aviation
authority for Canada, has issued Canadian Airworthiness Directive CF-
2014-30, dated September 5, 2014 (referred to after this as the
Mandatory Continuing Airworthiness Information, or ``the MCAI''), to
correct an unsafe condition for certain Bombardier, Inc. Model CL-600-
2B16 (CL-604 Variant) airplanes. The MCAI states:

A revision has been made to the CL 604/605 Time Limits/
Maintenance Checks (TLMC) manual, to introduce new tasks for the
HSTA. Failure to comply with the TLMC tasks could lead to an unsafe
condition.
This [Canadian] AD is issued to ensure that premature wear and
cracking of the affected components are detected and corrected.

The unsafe condition is premature wear and cracking of the HSTA,
which could result in failure of the HSTA and consequent loss of
control of the airplane.
You may examine the MCAI in the AD docket on the Internet at http://
www.regulations.gov by searching for and locating Docket No. FAA-2015-
8129.

Comments

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

Request To Change the Manufacturer's Contact Information

Bombardier Inc., asked that we change the contact information to
include the telephone numbers and email address for the Widebody
Customer Response Center. Bombardier Inc. provided the updated
information.
We agree with the commenter. We have changed the contact
information in this AD accordingly.

Conclusion

We reviewed the relevant data, considered the comment received, and
determined that air safety and the public interest require adopting
this AD with the change described previously and minor editorial
changes. 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.
We also determined that these changes will not increase the
economic burden on any operator or increase the scope of this AD.

Related Service Information Under 1 CFR Part 51

Bombardier Inc. has issued the following service information, which
describes procedures for revising the maintenance or inspection program
to incorporate new airworthiness limitations for the HSTA.
Section 5-10-40, Certification Maintenance Requirements,
of Part 2, Airworthiness Limitations, of the Bombardier Challenger 604
Time Limits/Maintenance Checks Manual, Revision 22, dated July 11,
2014.
Section 5-10-40, Certification Maintenance Requirements,
of Part 2, Airworthiness Limitations, of the Bombardier Challenger 605
Time Limits/Maintenance Checks Manual, Revision 10, dated July 11,
2014.
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 78 airplanes of U.S. registry.
We also estimate that it takes about 1 work-hour per product to
comply with the basic requirements of this AD. The average labor rate
is $85 per work-hour. Based on these figures, we estimate the cost of
this AD on U.S. operators to be $6,630, or $85 per product.

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 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 the 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 adding the following new airworthiness
directive (AD):