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Federal Register / Vol. 86, No. 208 / Monday, November 1, 2021 / Rules and Regulations Transportation, Docket Operations, M30, West Building Ground Floor, Room W12140, 1200 New Jersey Avenue SE, Washington, DC 20590.
FOR FURTHER INFORMATION CONTACT: Aziz Ahmed, Aerospace Engineer, Airframe and Propulsion Section, FAA, New York ACO Branch, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590;
telephone 5162287329; fax 516794
5531; 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
202043, dated October 21, 2020
referred to after this as the Mandatory Continuing Airworthiness Information, or the MCAI, to correct an unsafe condition for certain De Havilland Aircraft of Canada Limited Model DHC
8400, 401, and 402 airplanes. You may examine the MCAI in the AD
docket at https www.regulations.gov by searching for and locating Docket No.
FAA20210613.

The FAA issued a notice of proposed rulemaking NPRM to amend 14 CFR
part 39 by adding an AD that would apply to certain De Havilland Aircraft of Canada Limited Model DHC8400, 401, and 402 airplanes. The NPRM
published in the Federal Register on August 3, 2021 86 FR 41794. The NPRM was prompted by a report of cracking found on an MLG drag strut assembly. The NPRM proposed to require a records review to determine if an affected MLG drag strut assembly is installed, repetitive detailed inspections for cracking of affected strut assemblies, a one-time magnetic particle inspection for cracking, and on-condition actions if necessary. The FAA is issuing this AD
to address cracking of the MLG drag strut assembly and possible failure under compression loads during landing or ground operations, which could result in asymmetric MLG configuration and potential runway excursion. See the MCAI for additional background information.

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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
indicated 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.
Costs of Compliance The FAA estimates that this AD will affect 34 airplanes of U.S. registry. The FAA estimates the following costs to comply with this AD:

ESTIMATED COSTS FOR REQUIRED ACTIONS
Labor cost
Cost per product
Parts cost
Up to 11 work-hours $85 per hour = Up to $935

The FAA estimates the following costs to do any necessary on-condition actions that would be required based on
$0

Up to $935

the results of any required actions. The FAA has no way of determining the
Cost on U.S. operators Up to $31,790.

number of aircraft that might need these on-condition actions:

ESTIMATED COSTS OF ON-CONDITION ACTIONS
Labor cost
Cost per product
Parts cost
Up to 10 work-hours $85 per hour = Up to $850

$

Up to $850

Cost on U.S. operators Up to $850.

The FAA has received no definitive data that would enable the agency to provide parts cost estimates for the actions specified in this AD.

The FAA has included all known costs in its cost estimate. According to the manufacturer, however, some or all of the costs of this AD may be covered under warranty, thereby reducing the cost impact on affected operators.

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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.
The FAA is issuing this rulemaking under the authority described in Subtitle VII, Part A, Subpart III, Section
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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.
Regulatory Findings 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
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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 Will not affect intrastate aviation in Alaska, and 3 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.

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