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Federal Register / Vol. 86, No. 166 / Tuesday, August 31, 2021 / Rules and Regulations 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 on U.S.
operators
Cost per product $0

Up to $26,690

based on the results of the inspection.
The agency has no way of determining
Up to $3,122,730.

the number of aircraft that might need these installations and repairs:

ON-CONDITION COSTS
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 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.

khammond on DSKJM1Z7X2PROD with RULES

Cost per product
Action
Regulatory Findings 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
VerDate Sep<11>2014

19:07 Aug 30, 2021

Jkt 253001

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 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:

20211706 The Boeing Company:
Amendment 3921689; Docket No.
FAA20210376; Project Identifier AD
202100062T.
a Effective Date This airworthiness directive AD is effective October 5, 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.
d Subject Air Transport Association ATA of America Code 53, Fuselage.
e Unsafe Condition This AD was prompted by reports of cracks in the station STA 1000 front spar shear tie
PO 00000

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Up to $69,726.

at the left and right side buttock line BL
11.33, BL 33.99, BL 57.50, and BL 75.92, and in the intercostal lug fitting at the left and right side BL 11.33. The FAA is issuing this AD to address any cracking in these areas that could result in the loss of limit load capability in a principal structural element, the potential inability to restrain the cargo for certain cargo configurations, and the potential for a center fuel tank rupture for certain cargo configurations under limit load conditions, which could adversely affect the structural integrity of the airplane.
f Compliance Comply with this AD within the compliance times specified, unless already done.
g Required Actions Except as specified by paragraph h of this AD: At the applicable times specified in the Compliance paragraph of Boeing Alert Requirements Bulletin 74753A2904 RB, dated December 16, 2020, do all applicable actions identified in, and in accordance with, the Accomplishment Instructions of Boeing Alert Requirements Bulletin 74753A2904
RB, dated December 16, 2020.
NOTE 1 TO PARAGRAPH G: Guidance for accomplishing the actions required by this AD can be found in Boeing Alert Service Bulletin 74753A2904, dated December 16, 2020, which is referred to in Boeing Alert Requirements Bulletin 74753A2904 RB, dated December 16, 2020.
h Exceptions to Service Information Specifications 1 Where Boeing Alert Requirements Bulletin 74753A2904 RB, dated December 16, 2020, uses the phrase the original issue date of Requirements Bulletin 74753A2904
RB, this AD requires using the effective date of this AD.
2 Where Boeing Alert Requirements Bulletin 74753A2904 RB, dated December 16, 2020, specifies contacting Boeing for repair instructions: This AD requires doing the repair using a method approved in accordance with the procedures specified in paragraph i of this AD.

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