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Federal Register / Vol. 86, No. 34 / Tuesday, February 23, 2021 / Rules and Regulations this AD. The FAA has not changed the AD in this regard.

burden on any operator or increase the scope of this final rule.

Conclusion
Related Service Information Under 1
CFR Part 51

The FAA reviewed the relevant data, considered the comments 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
The FAA reviewed Boeing Multi Operator Message MOMMOM20
004901BR4, dated September 28, 2020. This service information describes procedures for a general visual inspection for insufficient sealant in the SOB slot. The service information also describes procedures for related investigative actions including a general visual inspection of the ADMB for fuel contamination, a check for external leaks of the center fuel tank external surfaces inside the pressure boundary, and an internal leak check of the center fuel tank to identify the leakage paths.

The service information also describes procedures for corrective actions including removal of all insulation blankets below the crease beam left side to right side, clean-up of all fuel contamination, repair of any leak, preparation of the SOB slot for sealing, application of sealant, and repair of the secondary fuel barrier. 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 731 airplanes of U.S. registry.
The FAA estimates the following costs to comply with this AD:

ESTIMATED COSTS
Action
Labor cost
Inspection for sealant

30 work-hours $85 per hour = $2,550

The FAA estimates the following costs to do any necessary repairs that
Cost per product
Parts cost
would be required based on the results of the inspection. The FAA has no way
$0

Cost on U.S.
operators
$2,550

$1,864,050

of determining the number of aircraft that might need these repairs:

ON-CONDITION COSTS
Action
Labor cost
Parts cost
Repair of sealant
Insulation blanket replacement
Leak checks

2 work-hours $85 per hour = $170
24 work-hours $85 per hour = $2,040
6 work-hours $85 per hour = $510

Cost per product
$129
6,312
0

$299
8,352
510

Authority for This Rulemaking
Regulatory Findings
Adoption of the Amendment
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.

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 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.

Accordingly, under the authority delegated to me by the Administrator, the FAA amends 14 CFR part 39 as follows:

VerDate Sep<11>2014

21:28 Feb 22, 2021

Jkt 253001

List of Subjects in 14 CFR Part 39
Air transportation, Aircraft, Aviation safety, Incorporation by reference, Safety.

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Fmt 4700

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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:

20210214 The Boeing Company:
Amendment 3921397 ; Docket No.
FAA20200331; Product Identifier 2020NM019AD.
a Effective Date This airworthiness directive AD is effective March 30, 2021.
b Affected ADs None.

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