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Federal Register / Vol. 86, No. 35 / Wednesday, February 24, 2021 / Rules and Regulations West, Dorval, Quebec H4S 2A3, Canada;
North America toll-free telephone 1
8665381247 or direct-dial telephone 15148552999; email ac.yul@
aero.bombardier.com; internet https
www.bombardier.com. You may view this service information at the FAA, Airworthiness Products Section, Operational Safety Branch, 2200 South 216th St., Des Moines, WA. For information on the availability of this material at the FAA, call 2062313195.
It is also available on the internet at https www.regulations.gov by searching for and locating Docket No.
FAA20200859.
Examining the AD Docket You may examine the AD docket on the internet at https
www.regulations.gov by searching for and locating Docket No. FAA2020
0859; or in person at Docket Operations between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays.
The AD docket contains this final rule, any comments received, and other information. The address for Docket Operations is U.S. Department of Transportation, Docket Operations, M
30, West Building Ground Floor, Room W12140, 1200 New Jersey Avenue SE, Washington, DC 20590.
FOR FURTHER INFORMATION CONTACT:
Siddeeq Bacchus, Aerospace Engineer, Mechanical Systems and Administrative Services Section, FAA, New York ACO
Branch, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590; telephone 5162287362; fax 5167945531; email 9-avs-nyaco-cos@faa.gov.
SUPPLEMENTARY INFORMATION:
Discussion Transport Canada Civil Aviation TCCA, which is the aviation authority for Canada, has issued TCCA AD CF
202012, dated April 17, 2020 TCCA
AD CF202012 also referred to as the Mandatory Continuing Airworthiness Information, or the MCAI, to correct an unsafe condition for certain Bombardier, Inc., Model BD1001A10 airplanes.

You may examine the MCAI in the AD
docket on the internet at https
www.regulations.gov by searching for and locating Docket No. FAA2020
0859.
The FAA 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 BD1001A10 airplanes. The NPRM
published in the Federal Register on October 1, 2020 85 FR 61881. The NPRM was prompted by reports of failure of a certain FIREX control unit.
The NPRM proposed to require replacing FIREX control units having a certain part number. The FAA is issuing this AD to address the failure of a FIREX
control unit, which could result in the loss of the ability to detect a fire. See the MCAI for additional background information.
Comment The FAA gave the public the opportunity to participate in developing this final rule. The following presents the comment received on the NPRM and the FAAs response to that comment.
Request To Allow Records Review NetJets requested that paragraph i of the proposed AD be revised to allow operators to review airplane maintenance records to determine the part number of the FIREX control unit installed on an airplane. The commenter stated that for the airplane having serial number S/N 20662 the logbook delivery document specifies that the 3
FIREX control unit is installed. The commenter explained that there is not a signoff sheet for Bombardier Service Bulletin 35026001, but that the serialized parts list clearly indicates that the 3 FIREX control unit is installed.
The FAA disagrees with the commenters request because this AD
does not mandate the method an operator must use to determine what FIREX control unit part number is installed on an airplane. As specified in paragraph c of this AD, this AD is only
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applicable to Bombardier, Inc., Model BD1001A10 airplanes fitted with FIREX control unit part number P/N
4741122. If an operator is able to confirm that FIREX control unit P/N
4741123 is installed on an airplane the requirements of this AD are not applicable to that airplane. This AD
requires operators to remove FIREX P/
N 4741122 and install P/N 4741123.
The FAA has not changed this AD in regard to this issue.
Conclusion The FAA reviewed the relevant data, considered the comment received, and determined that air safety and the public interest require adopting this final rule as proposed, except for minor editorial changes. The FAA has determined that these minor changes:
Are consistent with the intent that was proposed in the NPRM for addressing 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 has issued Service Bulletin 1002601, Revision 01, dated December 5, 2019; and Service Bulletin 35026001, Revision 01, dated December 5, 2019. This service information describes procedures for replacing FIREX control units having P/
N 4741122 with units having P/N
4741123. These documents are distinct since they apply to different airplane configurations. 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 The FAA estimates that this AD
affects 223 airplanes of U.S. registry.
The FAA estimates the following costs to comply with this AD:

khammond on DSKJM1Z7X2PROD with RULES

ESTIMATED COSTS FOR REQUIRED ACTIONS
Labor cost
Parts cost
Cost per product
Cost on U.S.
operators
1 work-hour $85 per hour = $85

$6,389

$6,474

$1,443,702

According to the manufacturer, some or all of the costs of this AD may be covered under warranty, thereby reducing the cost impact on affected operators. The FAA does not control warranty coverage for affected operators.

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As a result, the FAA has included all known costs in the cost estimate.
Authority for This Rulemaking Title 49 of the United States Code specifies the FAAs authority to issue rules on aviation safety. Subtitle I,
PO 00000

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section 106, describes the authority of the FAA Administrator. Subtitle VII:
Aviation Programs, describes in more detail the scope of the Agencys authority.
The FAA is issuing this rulemaking under the authority described in
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