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Federal Register / Vol. 86, No. 231 / Monday, December 6, 2021 / Rules and Regulations Request To Clarify Applicability Boeing asked that the applicability specified in paragraph c of the proposed AD be clarified, as follows:
This AD applies to The Boeing Company Model 7878 and 7879
airplanes, certificated in any category, as identified in Boeing Alert Requirements Bulletins B78781205
SB53007700 RB and B78781205
SB53007800 RB, both Issue 001, both dated September 8, 2020. Boeing stated that, although the applicability is the same in each bulletin, identifying both will avoid confusion for operators.
The FAA agrees with the commenter for the reason provided. Paragraph c of this AD only identifies Boeing Alert Requirements Bulletin B78781205
SB53007700 RB, Issue 001, dated September 8, 2020; therefore, the FAA
has changed paragraph c of this AD to identify both bulletins, as requested by the commenter.

Conclusion The FAA reviewed the relevant data, considered any comments received, and determined that air safety requires adopting this AD as proposed. Except for minor editorial changes, and any other changes described previously, this AD is adopted as proposed in the NPRM. None of the changes will increase the economic burden on any operator.
Related Service Information Under 1
CFR Part 51
The FAA reviewed Boeing Alert Requirements Bulletin B78781205
SB53007700 RB, Issue 001, dated September 8, 2020. The service information describes procedures for repetitive high frequency eddy current HFEC inspections for cracking of the forward edge of the AWWB side fitting and failsafe strap at station STA 1209
on the left and right side, and the AWWB side fitting outer chord surface
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and failsafe strap, and repair of any cracking found.
The FAA reviewed Boeing Alert Requirements Bulletin B78781205
SB53007800 RB, Issue 001, dated September 8, 2020. The service information describes procedures for repetitive HFEC inspections for cracking of the forward edge of the horizontal flange of the AWWB body chord and around all the fastener heads and vertical beam clips common to the AWWB body chord horizontal flange.
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 79 airplanes of U.S. registry. The FAA estimates the following costs to comply with this AD:

ESTIMATED COSTS FOR REQUIRED ACTIONS
Action
Labor cost
Repetitive inspections

16 work-hours $85 per hour = $1,360 per inspection cycle.

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The FAA has received no definitive data on which to base the cost estimates for the on-condition 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.
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
VerDate Sep<11>2014

15:44 Dec 03, 2021

Jkt 256001

Parts cost
Cost per product $0

$1,360 per inspection cycle.

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.
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.

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39.13

Cost on U.S. operators $107,440 per inspection cycle.

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

20212321 The Boeing Company:
Amendment 3921820; Docket No.
FAA20210338; Project Identifier AD
202001423T.
a Effective Date This airworthiness directive AD is effective January 10, 2022.
b Affected ADs None.
c Applicability This AD applies to The Boeing Company Model 7878 and 7879 airplanes, certificated in any category, as identified in Boeing Alert Requirements Bulletins B787
81205SB53007700 RB and B78781205
SB53007800 RB, both Issue 001, both dated September 8, 2020.
d Subject Air Transport Association ATA of America Code 53, Fuselage.
e Unsafe Condition This AD was prompted by reports that shimming requirements were not met during the assembly of certain aft wheel well bulkhead AWWB structural joints, which can result in reduced fatigue thresholds and cracking of the affected structural joints. The FAA is issuing this AD to address undetected fatigue cracking, which could weaken
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