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Federal Register / Vol. 86, No. 123 / Wednesday, June 30, 2021 / Proposed Rules
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, 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 20050518, Amendment 39
14007 70 FR 12410, March 14, 2005, and b. Adding the following new AD:

The Boeing Company: Docket No. FAA
20210503; Project Identifier AD2021
00163T.
a Comments Due Date The FAA must receive comments on this airworthiness directive AD action by August 16, 2021.
b Affected ADs This AD replaces AD 20050518, Amendment 3914007 70 FR 12410, March 14, 2005 AD 20050518.
c Applicability 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.

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d Subject Air Transport Association ATA of America Code 53, Fuselage.
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.
f Compliance Comply with this AD within the compliance times specified, unless already done.

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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 73753
1251, 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 principal inspector or responsible Flight Standards Office, as appropriate. If sending information directly to the manager of the certification office, send it to the attention of the person identified in Related Information.
Information may be emailed to: 9-ANMSeattle-ACO-AMOC-Requests@faa.gov.
2 Before using any approved AMOC, notify your appropriate principal inspector,
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or lacking a principal inspector, the manager of the responsible Flight Standards Office.
3 An AMOC that provides an acceptable level of safety may be used for any repair, modification, or alteration required by this AD if it is approved by The Boeing Company Organization Designation Authorization ODA that has been authorized by the Manager, Seattle ACO Branch, FAA, to make those findings. To be approved, the repair method, modification deviation, or alteration deviation must meet the certification basis of the airplane, and the approval must specifically refer to this AD.
4 AMOCs approved for AD 20050518
are approved as AMOCs for the corresponding provisions of Boeing Alert Service Bulletin 73753A1251 Revision 2, dated January 20, 2021, that are required by paragraph g of this AD.
5 Except as specified by paragraph h of this AD: For service information that contains steps that are labeled as Required for Compliance RC, the provisions of paragraphs j5i and ii of this AD apply.
i The steps labeled as RC, including substeps under an RC step and any figures identified in an RC step, must be done to comply with the AD. If a step or substep is labeled RC Exempt, then the RC
requirement is removed from that step or substep. An AMOC is required for any deviations to RC steps, including substeps and identified figures.
ii Steps not labeled as RC may be deviated from using accepted methods in accordance with the operators maintenance or inspection program without obtaining approval of an AMOC, provided the RC steps, including substeps and identified figures, can still be done as specified, and the airplane can be put back in an airworthy condition.
k Related Information 1 For more information about this AD, contact Wayne Lockett, Aerospace Engineer, Airframe Section, FAA, Seattle ACO Branch, 2200 South 216th St., Des Moines, WA
98198; phone and fax: 2062313524; email:
wayne.lockett@faa.gov.
2 For service information identified in this AD, contact Boeing Commercial Airplanes, Attention: Contractual & Data Services C&DS, 2600 Westminster Blvd., MC 110SK57, Seal Beach, CA 907405600;
telephone 5627971717; internet https
www.myboeingfleet.com. You may view this referenced service information at the FAA, Airworthiness Products Section, Operational Safety Branch, 2200 South 216th St., Des Moines, WA. For information on the availability of this material at the FAA, call 2062313195.
Issued on June 11, 2021.
Lance T. Gant, Director, Compliance & Airworthiness Division, Aircraft Certification Service.
FR Doc. 202113930 Filed 62921; 8:45 am BILLING CODE 491013P

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