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Federal Register / Vol. 86, No. 154 / Friday, August 13, 2021 / Proposed Rules ESTIMATED COSTS FOR REQUIRED ACTIONS
Action
Labor cost
Retained actions from AD 20161712 959 airplanes
1 work-hour $85 per hour = $85 ..

Cost per product
Parts cost $0

$85

Cost on U.S.
operators $81,515

Table does not include estimated costs for reporting/revising the existing maintenance or inspection program.

The FAA has determined that revising the existing maintenance or inspection program takes an average of 90 workhours per operator, although the agency recognizes that this number may vary from operator to operator. Since operators incorporate maintenance or inspection program changes for their
affected fleets, the FAA has determined that a per-operator estimate is more accurate than a per-airplane estimate.
The FAA estimates the total cost per operator for the new proposed actions to be $7,650 90 work-hours $85 per work-hour.

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 this on-condition action:

ESTIMATED COSTS OF ON-CONDITION ACTIONS
Labor cost
Parts cost
21 work-hours $85 per hour = $1,785

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.

jbell on DSKJLSW7X2PROD with PROPOSALS

Regulatory Findings
16:19 Aug 12, 2021

List of Subjects in 14 CFR Part 39
Air transportation, Aircraft, Aviation safety, Incorporation by reference, Safety.
The Proposed Amendment Accordingly, under the authority delegated to me by the Administrator, the FAA proposes to amend 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

Jkt 253001

2. The FAA amends 39.13 by:
a. Removing Airworthiness Directive AD 20161712, Amendment 39
18625 81 FR 58823, August 26, 2016;
and b. Adding the following new AD:
Airbus SAS: Docket No. FAA20210663;
Project Identifier MCAI202001618T.
a Comments Due Date The FAA must receive comments on this airworthiness directive AD by September 27, 2021.
b Affected ADs 1 This AD replaces AD 20161712, Amendment 3918625 81 FR 58823, August 26, 2016 AD 20161712.

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$28,285

2 This AD affects AD 20202110, Amendment 3921283 85 FR 65190, October 15, 2020 AD 20202110.
c Applicability This AD applies to all Airbus SAS
airplanes, certificated in any category, identified in paragraphs c1 through 7 of this AD.
1 Model A318111, 112, 121, and 122
airplanes.
2 Model A319111, 112, 113, 114, 115, 131, 132, and 133 airplanes.
3 Model A320211, 212, 214, 216, 231, 232, and 233 airplanes.
4 Model A321111, 112, 131, 211, 212, 213, 231, and 232 airplanes.
5 Model A319151N, 153N, and 171N
airplanes.
6 Model A320251N, 252N, 253N, 271N, 272N, and 273N airplanes.
7 Model A321251N, 251NX, 252N, 252NX, 253N, 253NX, 271N, 271NX, 272N, and 272NX airplanes.
d Subject
Amended

The FAA determined that this proposed AD would not have federalism implications under Executive Order 13132. This proposed AD would 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 this proposed regulation:
1 Is not a significant regulatory action under Executive Order 12866, 2 Would not affect intrastate aviation in Alaska, and
VerDate Sep<11>2014

3 Would not have a significant economic impact, positive or negative, on a substantial number of small entities under the criteria of the Regulatory Flexibility Act.

$26,500

Cost per product
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Air Transport Association ATA of America Code 05, Time Limits/Maintenance Checks; 27, Flight Controls.
e Reason This AD was prompted by a determination that new or more restrictive airworthiness limitations are necessary. The FAA is issuing this AD to address premature wear of the carbon friction disks on the no-back brake NBB of the trimmable horizontal stabilizer actuator THSA, which could lead to reduced braking efficiency in certain load conditions, and, in conjunction with the inability of the power gear train to keep the ball screw in its last commanded position, could result in uncommanded movements of the trimmable horizontal stabilizer and loss of control of the airplane.

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