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Federal Register / Vol. 86, No. 161 / Tuesday, August 24, 2021 / Proposed Rules ON-CONDITION COSTSContinued Action
Labor cost
General visual inspection

1 work-hour $85 per hour = $85

The FAA has received no definitive data on which to base the cost estimates for the on-condition repairs specified in this proposed 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
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The FAA has 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 that the 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,
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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:
a. Removing Airworthiness Directive AD 20172302, Amendment 39
19096 82 FR 52835, November 15, 2017, and b. Adding the following new AD:

The Boeing Company: Docket No. FAA
20210665; Project Identifier AD2021
00270T.
a Comments Due Date The FAA must receive comments on this airworthiness directive AD action by October 8, 2021.
b Affected ADs This AD replaces AD 20172302, Amendment 3919096 82 FR 52835, November 15, 2017 AD 20172302.
c Applicability This AD applies to The Boeing Company Model 737100, 200, 200C, 300, 400, and 500 series airplanes, certificated in any category, as identified in Boeing Alert Service Bulletin 73753A1358, Revision 1, dated February 26, 2021.
d Subject Air Transport Association ATA of America Code 53, Fuselage.
e Unsafe Condition This AD was prompted by an evaluation by the design approval holder indicating that the fuselage crown skin panels are subject to widespread fatigue damage. This AD was also prompted by a determination that certain airplane configurations and inspection locations need to be revised, and that additional airplanes are subject to the unsafe condition. The FAA is issuing this AD
to address cracking in the fuselage crown skin panels. Multiple adjacent cracks in the fuselage crown skin could link up and lead to decompression or loss of structural integrity of the airplane.
f Compliance Comply with this AD within the compliance times specified, unless already done.
g Actions for Group 43 Airplanes For airplanes identified as Group 43 in Boeing Alert Service Bulletin 73753A1358,
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Cost per product
Parts cost 0

85

Revision 1, dated February 26, 2021, within 120 days after the effective date of this AD, inspect the airplane and do all applicable oncondition actions using a method approved in accordance with the procedures specified in paragraph j of this AD
h Required Actions for Groups 1 Through 42 Airplanes For airplanes identified as Groups 1
through 42 in Boeing Alert Service Bulletin 73753A1358, Revision 1, dated February 26, 2021, except as specified by paragraph i of this AD: At the applicable times specified in paragraph 1.E., Compliance, of Boeing Alert Service Bulletin 73753A1358, Revision 1, dated February 26, 2021, do all applicable actions identified as RC
required for compliance in, and in accordance with, the Accomplishment Instructions of Boeing Alert Service Bulletin 73753A1358, Revision 1, dated February 26, 2021. Actions identified as terminating action in Boeing Alert Service Bulletin 737
53A1358, Revision 1, dated February 26, 2021, terminate the applicable required actions of this AD, provided the terminating action is done in accordance with the Accomplishment Instructions of Boeing Alert Service Bulletin 73753A1358, Revision 1, dated February 26, 2021.
i Exceptions to Service Information Specifications 1 Where Boeing Alert Service Bulletin 73753A1358, Revision 1, dated February 26, 2021, uses the phrase the original issue date of this service bulletin, this AD requires using December 20, 2017 the effective date of AD 20172302.
2 Where Boeing Alert Service Bulletin 73753A1358, Revision 1, dated February 26, 2021, specifies contacting Boeing for repair instructions or for work instructions, this AD
requires doing the repair, or doing the work instructions and applicable on-condition actions using a method approved in accordance with the procedures specified in paragraph j of this AD.
3 Part 7 of Boeing Alert Service Bulletin 73753A1358, Revision 1, dated February 26, 2021, specifies post-modification airworthiness limitation inspections in compliance with 14 CFR 25.571a3 at the modified locations to support compliance with 14 CFR 121.1109c2 or 129.109b2.
Although Part 7 is identified as RC, this AD
does not require accomplishment of Part 7.
As airworthiness limitations, these inspections are required by maintenance and operational rules. It is, therefore, unnecessary to mandate them in this AD. Deviations from these inspections require FAA approval, but do not require an alternative method of compliance.

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