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Federal Register / Vol. 86, No. 123 / Wednesday, June 30, 2021 / Rules and Regulations
tolerance ligaments, and corrective actions if necessary. Corrective actions include replacement of seat track sections, and replacement of the entire seat track. 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 59 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 28 work-hours $85 per hour = Up to $2,380

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

Cost on U.S.
operators
Up to $2,380

based on the results of any required actions. The FAA has no way of determining the number of aircraft that
Up to $140,420.

might need these on-condition replacements:

ESTIMATED COSTS OF ON-CONDITION ACTIONS
Labor cost
Cost per product
Parts cost
172 work-hours $85 per hour = $14,620

$14,620

The FAA has received no definitive data that would enable us to provide parts cost estimates for the on-condition replacements specified in this AD.

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 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.

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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 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
16:21 Jun 29, 2021

List of Subjects in 14 CFR Part 39
Air transportation, Aircraft, Aviation safety, Incorporation by reference, Safety.
Adoption of the Amendment Accordingly, under the authority delegated to me by the Administrator, the FAA amends 14 CFR part 39 as follows:
PART 39AIRWORTHINESS
DIRECTIVES
1. The authority citation for part 39
continues to read as follows:

Authority: 49 U.S.C. 106g, 40113, 44701.
39.13

Amended
2. The FAA amends 39.13 by adding the following new airworthiness directive:

Regulatory Findings
VerDate Sep<11>2014

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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20211217 ATRGIE Avions de Transport Regional: Amendment 3921604; Docket No. FAA20200790; Project Identifier 2020NM077AD.
a Effective Date This airworthiness directive AD is effective August 4, 2021.
b Affected ADs None.
c Applicability This AD applies to the ATRGIE Avions de Transport Regional airplanes identified in
PO 00000

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paragraphs c1 and 2 of this AD, certificated in any category.
1 Model ATR42300, 320, and 500
airplanes, all manufacturer serial numbers, except manufacturer serial numbers 001
through 362 inclusive.
2 ATR72101, 102, 201, 202, 211, 212, and 212A airplanes, all manufacturer serial numbers.
d Subject Air Transport Association ATA of America Code 53, Fuselage.
e Reason This AD was prompted by reports of defective seat tracks. The FAA is issuing this AD to address a structural failure of the seat track attachment during an emergency landing, possibly resulting in injury to occupants, and affecting emergency evacuation.
f Compliance Comply with this AD within the compliance times specified, unless already done.
g Requirements Except as specified in paragraph h of this AD: Comply with all required actions and compliance times specified in, and in accordance with, European Union Aviation Safety Agency EASA AD 20200097R1, dated May 28, 2020 EASA AD 2020
0097R1.
h Exceptions to EASA AD 20200097R1
1 Where EASA AD 20200097R1 refers to May 18, 2020 the effective date of its original issue, this AD requires using the effective date of this AD.
2 The Remarks section of EASA AD
20200097R1 does not apply to this AD.

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