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Federal Register / Vol. 86, No. 33 / Monday, February 22, 2021 / Rules and Regulations The FAA has included all known costs in the cost estimate. According to the manufacturer, however, some or all of the costs of this AD may be covered under warranty, thereby reducing the cost impact on affected operators.

39.13

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

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.

20210104 The Boeing Company:
Amendment 3921380; Docket No.
FAA20200459; Product Identifier 2020NM049AD.

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.

d Subject Air Transport Association ATA of America Code 52, Doors.

List of Subjects in 14 CFR Part 39
Air transportation, Aircraft, Aviation safety, Incorporation by reference, Safety.

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Authority: 49 U.S.C. 106g, 40113, 44701.

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:

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a Effective Date This airworthiness directive AD is effective March 29, 2021.
b Affected ADs None.
c Applicability 1 This AD applies to all The Boeing Company Model 737 series airplanes, excluding Model 737100, 200, 200C, 300, 400, and 500 series airplanes, certificated in any category.
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.

e Unsafe Condition This AD was prompted by reports of cracked or completely severed lugs in the stop fitting assembly of the forward entry door. The FAA is issuing this AD to address such cracking or severing, which could result in reduced structural integrity of the forward entry door and consequent rapid decompression of the airplane.
f Compliance Comply with this AD within the compliance times specified, unless already done.
g Required Actions For airplanes having a date of issuance of the original airworthiness certificate or date of issuance of the original export certificate of airworthiness on or before the effective date of this AD: Except as specified by paragraph h of this AD, at the applicable times specified in the Compliance paragraph of Boeing Alert Requirements Bulletin 73752A1180 RB, dated January 24, 2020, do all applicable actions identified in, and in accordance with, the Accomplishment Instructions of Boeing Alert Requirements Bulletin 73752A1180 RB, dated January 24, 2020.
Note 1 to paragraph g: Guidance for accomplishing the actions required by this AD can be found in Boeing Alert Service Bulletin 73752A1180, dated January 24, 2020, which is referred to in Boeing Alert Requirements Bulletin 73752A1180 RB, dated January 24, 2020.

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h Exceptions to Service Information Specifications 1 Where Boeing Alert Requirements Bulletin 73752A1180 RB, dated January 24, 2020, uses the phrase the original issue date of Requirements Bulletin 73752A1180 RB, this AD requires using the effective date of this AD.
2 Where Boeing Alert Requirements Bulletin 73752A1180 RB, dated January 24, 2020, specifies contacting Boeing for repair instructions: This AD requires doing the repair before further flight using a method approved in accordance with the procedures specified in paragraph j of this AD.
3 Where the heading in Table 1 of the Accomplishment Instructions in Boeing Alert Requirements Bulletin 73752A1180 RB, dated January 24, 2020, identifies SB 747
52A1180, the correct reference for this AD
is SB 73752A1180.
i Parts Installation Prohibition No person may install a stop fitting assembly with part number 141A61043 or a forward entry door that has a stop fitting assembly with part number 141A61043, on any airplane, as of the applicable time specified in paragraph i1, 2, or 3 of this AD.
1 For airplanes having an original airworthiness certificate or original export certificate of airworthiness dated after the effective date of this AD: As of the effective date of this AD.
2 For airplanes on which it is determined a stop fitting assembly with part number 141A61043 is not installed, as required by paragraph g of this AD: After accomplishing the inspection, records check, or measurement required by paragraph g of this AD.
3 For airplanes on which it is determined a stop fitting assembly with part number 141A61043 is installed, as required by paragraph g of this AD: After accomplishing the replacement required by paragraph g of 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 local Flight Standards District Office, as appropriate. If sending information directly to the manager of the certification office, send it to the attention of the person identified in paragraph k1 of this AD. Information may be emailed to: 9ANM-Seattle-ACO-AMOC-Requests@faa.gov.
2 Before using any approved AMOC, notify your appropriate principal inspector, or lacking a principal inspector, the manager of the local flight standards district office/
certificate holding district 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
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