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Federal Register / Vol. 86, No. 107 / Monday, June 7, 2021 / Proposed Rules FAAs Determination The FAA is issuing this NPRM after determining that the unsafe condition described previously is likely to exist or develop on other products of the same type design.
Related Service Information Under 1
CFR Part 51
The FAA reviewed Boeing Alert Requirements Bulletin 74753A2904
RB, dated December 16, 2020. This service information specifies procedures for repetitive detailed and surface HFEC
inspections of the STA 1000 front spar shear tie at the left and right side BL
11.33, BL 33.99, BL 57.50, and BL 75.92,
and of the intercostal lug fitting at the left and right side BL 11.33, for any cracking, and applicable on-condition actions. On-condition actions include repair, installing a new front spar shear tie, and installing a new intercostal lug fitting. 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 ADDRESSES.

the service information already described except for any differences identified as exceptions in the regulatory text of this proposed AD. For information on the procedures and compliance times, see this service information at https
www.regulations.gov by searching for and locating Docket No. FAA2021
0376.

Proposed AD Requirements in This NPRM

The FAA estimates that this AD, if adopted as proposed, would affect 117
airplanes of U.S. registry. The FAA
estimates the following costs to comply with this proposed AD:

This proposed AD would require accomplishing the actions specified in
Costs of Compliance
ESTIMATED COSTS
Action
Labor cost
Inspections

Up to 314 work-hours $85 per hour = Up to $26,690

The FAA estimates the following costs to do any necessary installations and repairs that would be required
Parts cost
Cost per product $0

based on the results of the proposed inspection. The agency has no way of determining the number of aircraft that
Up to $26,690

Cost on U.S.
operators Up to $3,122,730.

might need these installations and repairs:

ON-CONDITION COSTS
Action
Labor cost
Parts cost
Installations

Up to 368 work-hour $85 per hour = Up to $31,280.

Up to $38,446 for shear ties and intercostal lug fittings.

The FAA has received no definitive data on which to base the cost estimates for the repairs specified in this proposed AD.

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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 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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Regulatory Findings 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 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.
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,
PO 00000

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Cost per product Up to $69,726.

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

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

The Boeing Company: Docket No. FAA
20210376; Project Identifier AD2021
00062T.
a Comments Due Date The FAA must receive comments on this airworthiness directive AD by July 22, 2021.
b Affected ADs None.
c Applicability This AD applies to all The Boeing Company Model 747100, 100B, 100B
SUD, 200B, 200C, 200F, 300, 400, 400D, 400F, 747SR, and 747SP airplanes, certificated in any category.

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