DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2017-0810; Product Identifier 2017-NM-045-AD; Amendment
39-19240; AD 2018-07-09]
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-600-2C10 (Regional Jet Series 700, 701, &
702), Model CL-600-2D15 (Regional Jet Series 705), Model CL-600-2D24
(Regional Jet Series 900), and Model CL-600-2E25 (Regional Jet Series
1000) airplanes. This AD was prompted by a report of a smoke-in-cabin
event due to a non-sustaining electrical fire. This AD requires
installation of protective sleeves on the bonding jumper wires of
affected galleys and lavatories. We are issuing this AD to address the
unsafe condition on these products.

DATES: This AD is effective May 14, 2018.
The Director of the Federal Register approved the incorporation by
reference of a certain publication listed in this AD as of May 14,
2018.

ADDRESSES: For service information identified in this final rule,
contact Bombardier, Inc., 400 Cote Vertu Road West, Dorval,
Quebec H4S 1Y9, Canada; Widebody Customer Response Center North
America toll-free telephone: 1-866-538-1247 or direct-dial telephone:
1-514-855-2999; fax: 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 Standards Branch, 2200 South 216th
St., Des Moines, WA. For information on the availability of this material at the
FAA, call 206-231-3195. It is also available on the internet at http://www.
regulations.gov by searching for and locating Docket No. FAA-2017-0810.

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-2017-0810;
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 (telephone:
800-647-5527) is Docket 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: Assata Dessaline, Aerospace Engineer,
Avionics and Administrative Services Section, FAA, New York ACO Branch,
1600 Stewart Avenue, Suite 410, Westbury, NY 11590; telephone: 516-228-
7301; 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-600-2C10 (Regional Jet Series 700, 701, & 702), Model CL-600-
2D15 (Regional Jet Series 705), Model CL-600-2D24 (Regional Jet Series
900), and Model CL-600-2E25 (Regional Jet Series 1000) airplanes. The
NPRM published in the Federal Register on September 13, 2017 (82 FR
42953) (``the NPRM''). The NPRM was prompted by a report of a smoke-in-
cabin event due to a non-sustaining electrical fire. The NPRM proposed
to require installation of protective sleeves on the bonding jumper
wires of affected galleys and lavatories. We are issuing this AD to
prevent an electrical short of a bonding jumper wire that may result in
in-flight smoke or fire events, as well as failure of avionics
equipment, due to possible water spray or leakage from a damaged water
supply line.
Transport Canada Civil Aviation (TCCA), which is the aviation
authority for Canada, has issued Canadian AD CF-2016-20R1, dated
February 3, 2017 (referred to after this as the Mandatory Continuing
Airworthiness Information, or ``the MCAI''), to correct an unsafe
condition for certain Bombardier, Inc., Model CL-600-2C10 (Regional Jet
Series 700, 701, & 702), Model CL-600-2D15 (Regional Jet Series 705),
Model CL-600-2D24 (Regional Jet Series 900), and Model CL-600-2E25
(Regional Jet Series 1000) airplanes. The MCAI states:

A CRJ900 aeroplane reported a smoke in cabin event due to a non-
sustaining electrical fire. The source of smoke was traced to a
burnt heated water supply line behind the #2 Galley. The surrounding
insulation was also found burnt.
The root cause of this electrical fire was an electrical short
between an un-insulated bonding jumper and a terminal block carrying
115 volts AC. The circuit resistance was high enough and the circuit
breakers that protect the wiring did not trip open.
Electrical short of a bonding jumper may result in in-flight
smoke or fire events as well as failure of avionics equipment due to
possible water spray or leakage from a damaged water supply line.
The likelihood of this happening is increased by the removal and
installation of the galley or lavatory during maintenance, allowing
the bonding jumper to become wedged under the terminal block.
* * * * *
Revision 1 of this [Canadian] AD is issued to mandate [the
installation of protective sleeves on the galley and lavatory
bonding jumper wires in accordance with] Bombardier Service Bulletin
(SB) 670BA-25-101 Revision B dated 12 January 2017. * * *

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-2017-0810.

Comments

We gave the public the opportunity to participate in developing
this final rule. We considered the comment received. The Air Line
Pilots Association, International supported the NPRM.

Conclusion

We reviewed the relevant data, considered the comment received, 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 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

Bombardier, Inc., has issued Service Bulletin 670BA-25-101,
Revision B, dated January 12, 2017. The service information describes
procedures for installation of protective sleeves on the bonding jumper
wires of affected galleys and lavatories. 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 544 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 transport category airplanes to
the Director of the System Oversight 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 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):