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Federal Register / Vol. 86, No. 34 / Tuesday, February 23, 2021 / Rules and Regulations
RJ Aviation ULC, 12655 Henri-Fabre Blvd., Mirabel, Quebec J7N 1E1, Canada; Widebody Customer Response Center North America toll-free telephone +18442722720 or directdial telephone +15148558500; fax +15148558501; email thd.crj@
mhirj.com; internet https mhirj.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 206231
3195. It is also available on the internet at https www.regulations.gov by searching for and locating Docket No.
FAA20200691.
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
0691; 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:
Andrea Jimenez, Aerospace Engineer, Airframe and Propulsion Section, FAA, New York ACO Branch, 1600 Stewart Avenue, Suite 410, Westbury, NY
11590; telephone 5162287330; 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 Canadian AD
CF202009, dated April 7, 2020 also
referred to as the Mandatory Continuing Airworthiness Information, or the MCAI, to correct an unsafe condition for certain MHI RJ Aviation ULC Model CL6002B19 Regional Jet Series 100 &
440 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.
FAA20200691.
The FAA issued a notice of proposed rulemaking NPRM to amend 14 CFR
part 39 by adding an AD that would apply to certain MHI RJ Aviation ULC
Model CL6002B19 Regional Jet Series 100 & 440 airplanes. The NPRM
published in the Federal Register on October 5, 2020 85 FR 62626. The NPRM was prompted by evidence that a revised structural life limit of some components of the NLG and/or MLG
was not implemented during repair. The NPRM proposed to require verifying that the affected components are installed on the airplane, revising the structural life limits in the existing SDIR
airplane document, and replacing affected components if necessary. The FAA is issuing this AD to address structural life limits that are lower than the life limit published in the Maintenance Requirements Manual MRM, Part 2. This condition, if not corrected, could lead to the collapse of the affected NLG and/or MLG, possibly resulting in airplane damage and injury to the occupants. 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. Air Line Pilots Association, International ALPA stated that it supports the NPRM.
Additional Change Made to This AD
This AD has been revised to provide the revised structural life limits in figure
1 to paragraph h of this AD instead of referencing the individual repair engineering orders REOs in paragraph h of this AD. The REOs did not meet the Office of the Federal Registers criteria for incorporation by reference.
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 with the changes described previously and 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.
The FAA also determined that these changes will not increase the economic burden on any operator or increase the scope of this final rule.
Related Service Information Under 1
CFR Part 51
Bombardier has issued Service Bulletin 601R32112, dated November 11, 2019. This service information describes procedures for verifying that affected components are installed on the airplane, revising the structural life limits in the existing SDIR airplane document, and replacing affected parts if necessary. 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 456 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
Up to 143 work-hours $85 per hour = Up to $12,155

Up to $103,114

Up to $115,269

Up to $52,562,664.

Authority for This Rulemaking Title 49 of the United States Code specifies the FAAs 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 Agencys authority.

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The FAA is 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.

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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 This AD will not have federalism implications under Executive Order 13132. This AD will not have a
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