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Federal Register / Vol. 86, No. 42 / Friday, March 5, 2021 / Rules and Regulations and locating Docket No. FAA2020
1106.
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
1106; 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:
Kathleen Arrigotti, Aerospace Engineer, Large Aircraft Section, International Validation Branch, FAA, 2200 South 216th St., Des Moines, WA 98198;
telephone and fax 2062313218; email kathleen.arrigotti@faa.gov.
Background The EASA, which is the Technical Agent for the Member States of the European Union, has issued EASA AD
20200166, dated July 27, 2020 EASA
AD 20200166 also referred to as the Mandatory Continuing Airworthiness Information, or the MCAI, to correct an unsafe condition for certain Airbus SAS
Model A350941 and A3501041
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 SAS Model A350941 and A3501041 airplanes.

The NPRM published in the Federal Register on December 4, 2020 85 FR
78279. The NPRM was prompted by reports that suitable corrosion protection treatment had not been applied to certain areas of the seat track.
The NPRM proposed to require a onetime detailed inspection of the seat tracks between certain frames for suitable corrosion protection or presence of corrosion, and on-condition actions if necessary, as specified in EASA AD 20200166.
The FAA is issuing this AD to address a potential structural deficiency at certain seat track locations, providing insufficient resistance to environmental damage. This condition, if not addressed, could lead to seat or monument detachment during an emergency landing, possibly resulting in injury to occupants and preventing safe evacuation from the airplane. 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 comments on the NPRM or on the determination of the cost to the public.
Clarification of Terminology The FAA has added paragraph h3
to this AD to clarify the definition of deficiencies, which is used in EASA
AD 20200166 but is not referred to in the service information referenced in EASA AD 20200166.

Conclusion The FAA reviewed the relevant data and determined that air safety and the public interest require adopting this final rule with the change 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
EASA AD 20200166 describes procedures for a one-time detailed inspection of the seat tracks between certain frames for suitable corrosion protection or presence of corrosion, and on-condition actions if necessary. Oncondition actions include applying protection, removing corrosion, measuring the dimensions of the seat rails, and performing a splice repair.
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 5 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
14 work-hours $85 per hour = $1,190

$0

$1,190

$5,950

The FAA estimates the following costs to do any necessary on-condition actions 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 these on-condition actions:

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ESTIMATED COSTS OF ON-CONDITION ACTIONS
Labor cost
Parts cost
Cost per product
6 work-hours $85 per hour = $510

$0

$510

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
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warranty coverage for affected operators.
As a result, the FAA has included all known costs in the cost estimate.

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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
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