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Federal Register / Vol. 86, No. 103 / Tuesday, June 1, 2021 / Rules and Regulations 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.
FAA20210030.
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
0030; 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:
Background Transport Canada Civil Aviation TCCA, which is the aviation authority for Canada, has issued TCCA AD CF
202037, dated October 9, 2020 also referred to as the Mandatory Continuing Airworthiness Information, or the
MCAI, to correct an unsafe condition for certain Bombardier, Inc., Model BD
7001A10 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.
FAA20210030.
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 BD7001A10 airplanes. The NPRM
published in the Federal Register on February 24, 2021 86 FR 11191. The NPRM was prompted by a report indicating that during installation, a fuel pipe bracket assembly on the intermediate rib in the center fuel tank was mislocated, resulting in an offset between the fitting assembly and the refuel/defuel tube assembly. The NPRM
proposed to require modification of the fuel pipe bracket assembly, including all related investigative actions and corrective actions, if necessary; and performing an operational test of the refuel and defuel system. The FAA is issuing this AD to address the offset, which could cause a preload on the fuel pipes and reduce their ability to absorb shock or vibration-induced loads, making the tube and clamp more prone to stress corrosion cracking. This could lead to failure of the coupling and the bracket and p-clamp assembly, resulting in fuel leakage and loss of electrical bonding between fuel pipes, and lightning-induced sparking that could induce fuel 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 received no
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comments on the NPRM or on the determination of the cost to the public.
Conclusion The FAA reviewed the relevant data 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 700286006, dated June 1, 2020. This service information describes procedures for a modification of the fuel pipe bracket assembly, including investigative actions a detailed visual inspection of the fuel pipe assembly for any damaged paint, permanent deformation, corrosion, cracking, gouges, dents, or deep scratches;
installation of certain new parts;
replacement of the fuel pipe and fuel pipe bracket assembly, if necessary; and an operational test of the refuel and defuel system. 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 51 airplanes of U.S. registry. The FAA estimates the following costs to comply with this AD:

ESTIMATED COSTS FOR REQUIRED ACTIONS
Labor cost
Parts cost
Cost per product
Cost on U.S.
operators
10 work-hours $85 per hour = $850

$904

$1,754

$89,454

The FAA estimates the following costs to do any necessary on-condition action that would be required based on
the results of any required actions. The FAA has no way of determining the
number of aircraft that might need this on-condition action:

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ESTIMATED COSTS OF ON-CONDITION ACTIONS
Labor cost
Parts cost
Cost per product
3 work-hours $85 per hour = $255

$1,937

$2,192

According to the manufacturer, some or all of the costs of this AD may be covered under warranty, thereby
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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.

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