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Federal Register / Vol. 86, No. 213 / Monday, November 8, 2021 / Rules and Regulations
61681

ON-CONDITION COSTS
Action
Labor cost
Parts cost
Repair

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

Up to $30,000

Cost per product Up to $32,550.

Repair costs will vary depending on size of the repair required.

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 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.

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 20050518, Amendment 39
14007 70 FR 12410, March 14, 2005;
and b. Adding the following new AD:

20212109 The Boeing Company:
Amendment 3921769; Docket No.
FAA20210503; Project Identifier AD
202100163T.
a Effective Date This airworthiness directive AD is effective December 13, 2021.
b Affected ADs This AD replaces AD 20050518, Amendment 3914007 70 FR 12410, March 14, 2005 AD 20050518.
c Applicability 1 This AD applies to The Boeing Company Model 737600, 700, 700C, 800, and 900 series airplanes, certificated in any category, as identified in Boeing Alert Service Bulletin 73753A1251, Revision 2, dated January 20, 2021.
2 Installation of Supplemental Type Certificate STC ST00830SE does not affect the ability to accomplish the actions required by this AD. Therefore, for airplanes on which STC ST00830SE is installed, a change in product alternative method of compliance AMOC approval request is not necessary to comply with the requirements of 14 CFR
39.17.
d Subject Air Transport Association ATA of America Code 53, Fuselage.

The Amendment
e Unsafe Condition This AD was prompted by a report of cracks found at several of the fastener rows in the web lap splices at the dome apex of the aft pressure bulkhead, and the determination that airplanes not affected by AD 20050518 are subject to this unsafe condition. The FAA is issuing this AD to address fatigue cracks in the webs of the aft pressure bulkhead, which could result in rapid decompression of the airplane.

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

f Compliance Comply with this AD within the compliance times specified, unless already done.

List of Subjects in 14 CFR Part 39

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PART 39AIRWORTHINESS
DIRECTIVES

Air transportation, Aircraft, Aviation safety, Incorporation by reference, Safety.

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g Required Actions Except as specified by paragraph h of this AD: At the applicable times specified in paragraph 1.E., Compliance, of Boeing Alert Service Bulletin 73753A1251 Revision 2, dated January 20, 2021, do all applicable actions identified as RC required for compliance in, and in accordance with, the Accomplishment Instructions of Boeing Alert Service Bulletin 73753A1251, Revision 2, dated January 20, 2021. For Group 1
airplanes, as defined in Boeing Alert Service Bulletin 73753A1251, Revision 2, dated January 20, 2021: Step 3.B.2. of the Accomplishment Instructions of Boeing Alert Service Bulletin 73753A1251, Revision 2, dated January 20, 2021, is an RC step, and the provisions of paragraphs j5i and ii of this AD apply.
h Exceptions to Service Information Specifications 1 Where Boeing Alert Service Bulletin 73753A1251, Revision 2, dated January 20, 2021, uses the phrase the Revision 1 date of this service bulletin, this AD requires using the effective date of this AD.
2 Where Boeing Alert Service Bulletin 73753A1251, Revision 2, dated January 20, 2021, specifies contacting Boeing for repair instructions or for alternative inspections:
This AD requires doing the repair, or doing the alternative inspections and applicable oncondition actions using a method approved in accordance with the procedures specified in paragraph j of this AD.
i Credit for Previous Actions 1 For airplanes having line numbers 1
through 1166 inclusive: This paragraph provides credit for the corresponding actions of Boeing Alert Service Bulletin 737
53A1251, Revision 2, dated January 20, 2021, that are required by paragraph g of this AD, if those actions were performed before the effective date of this AD using Boeing Service Bulletin 737531251, dated June 3, 2004, which was incorporated by reference in AD
20050518.
2 This paragraph provides credit for the corresponding actions of Boeing Alert Service Bulletin 73753A1251, Revision 2, dated January 20, 2021, that are required by paragraph g of this AD, if those actions were performed before the effective date of this AD
using Boeing Alert Service Bulletin 737
53A1251, Revision 1, dated September 22, 2020, which is not incorporated by reference in this AD.
j Alternative Methods of Compliance AMOCs 1 The Manager, Seattle ACO Branch, FAA, has the authority to approve AMOCs for this AD, if requested using the procedures found in 14 CFR 39.19. In accordance with 14 CFR 39.19, send your request to your
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