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Federal Register / Vol. 86, No. 136 / Tuesday, July 20, 2021 / Rules and Regulations 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 in the AD docket on the internet at https
www.regulations.gov by searching for and locating Docket No. FAA2021
0339.

DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration 14 CFR Part 39
Docket No. FAA20210339; Project Identifier MCAI202001605T; Amendment 3921636; AD 20211409
RIN 2120AA64

Airworthiness Directives; Airbus Canada Limited Partnership Type Certificate Previously Held by C Series Aircraft Limited Partnership CSALP;
Bombardier, Inc. Airplanes Federal Aviation Administration FAA, DOT.
ACTION: Final rule.
AGENCY:

The FAA is adopting a new airworthiness directive AD for certain Airbus Canada Limited Partnership Model BD5001A10 and BD500
1A11 airplanes. This AD was prompted by a design review that identified rib 0
of the center wing box CWB as an area where a single failure of a clamshell type refuel/defuel line coupling could lead to the accumulation of dangerous levels of electrostatic charges within the fuel tank. This AD requires replacing the clamshell type refuel/defuel line coupling in the CWB at rib 0 with a threaded type fuel coupling, and installing an additional support bracket and clamp in the CWB at rib 0, as specified in a Transport Canada Civil Aviation TCCA AD, which is incorporated by reference. The FAA is issuing this AD to address the unsafe condition on these products.
DATES: This AD is effective August 24, 2021.
The Director of the Federal Register approved the incorporation by reference of a certain publication listed in this AD
as of August 24, 2021.
ADDRESSES: For material incorporated by reference IBR in this AD, contact TCCA, Transport Canada National Aircraft Certification, 159 Cleopatra Drive, Nepean, Ontario K1A 0N5, Canada; telephone 8886633639; email AD-CN@tc.gc.ca; internet https
tc.canada.ca/en/aviation. You may view this IBR material at the FAA, Airworthiness Products Section, SUMMARY:

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. FAA2021
0339; 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, M30, West Building Ground Floor, Room W12140, 1200 New Jersey Avenue SE, Washington, DC 20590.
FOR FURTHER INFORMATION CONTACT:
Joseph Catanzaro, Aerospace Engineer, Airframe and Propulsion Section, FAA, New York ACO Branch, 1600 Stewart Avenue, Suite 410, Westbury, NY
11590; telephone 5162287366; fax 5167945531; email 9-avs-nyaco-cos@
faa.gov.
SUPPLEMENTARY INFORMATION:
Background The TCCA, which is the aviation authority for Canada, has issued TCCA
AD CF202004, dated March 9, 2020
TCCA AD CF202004 also referred to as the Mandatory Continuing Airworthiness Information, or the MCAI, to correct an unsafe condition for certain Airbus Canada Limited Partnership Model BD5001A10 and BD5001A11 airplanes.
The FAA issued a notice of proposed rulemaking NPRM to amend 14 CFR
part 39 by adding an AD that would apply to certain Airbus Canada Limited Partnership Model BD5001A10 and BD5001A11 airplanes. The NPRM
published in the Federal Register on April 26, 2021 86 FR 21967. The NPRM was prompted by a design review that identified rib 0 of the CWB as an area where a single failure of a clamshell type refuel/defuel line
coupling could potentially lead to the accumulation of dangerous levels of electrostatic charges within the fuel tank. The NPRM proposed to require replacing the clamshell type refuel/
defuel line coupling in the CWB at rib 0 with a threaded type fuel coupling, and installing an additional support bracket and clamp in the CWB at rib 0, as specified in TCCA AD CF202004.
The FAA is issuing this AD to address failure of a clamshell type refuel/defuel line coupling, which could lead to fuel tank ignition. See the MCAI for additional background information.
Comments The FAA gave the public the opportunity to participate in developing this final rule. The FAA has considered the comment received. The Air Line Pilots Association, International ALPA
stated its support for the NPRM.
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
TCCA AD CF202004 describes procedures for replacing the clamshell type refuel/defuel line coupling in the CWB at rib 0 with a threaded type fuel coupling, and installing an additional support bracket and clamp in the CWB
at rib 0. This material 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 47 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
27 work-hours $85 per hour = $2,295

$7,191

$9,486

$445,842

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