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Federal Register / Vol. 86, No. 33 / Monday, February 22, 2021 / Rules and Regulations
We estimate the following costs to do any necessary system fault isolation and replacements that would be required
based on the results of the operational test. We have no way of determining the
number of aircraft that might need these actions:

ON-CONDITION COSTS
Action
Labor cost
Perform system fault isolation and replace faulty component

10 work-hours $85 per hour = $850

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, and 2 Will not affect intrastate aviation in Alaska.

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List of Subjects in 14 CFR Part 39
Air transportation, Aircraft, Aviation safety, Incorporation by reference, Safety.
Adoption of the Amendment Accordingly, under the authority delegated to me by the Administrator, the FAA amends 14 CFR part 39 as follows:

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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 adding the following new airworthiness directive:

20210107 The Boeing Company:
Amendment 3921383; Docket No.
FAA20201109; Product Identifier 2020NM067AD.
a Effective Date This airworthiness directive AD is effective March 9, 2021.
b Affected ADs This AD affects AD 20160406, Amendment 3918400 81 FR 9756, February 26, 2016 AD 20160406.
c Applicability This AD applies to The Boeing Company Model 737700 airplanes, certificated in any category, having line numbers L/Ns 481, 545, 684, 979, 1089, 1211, and 1223.
d Subject Air Transport Association ATA of America Code 2120, Air Distribution System.
e Unsafe Condition This AD was prompted by a determination that a repetitive test is needed to assess the components on airplanes equipped with a certain air distribution system configuration.
The FAA is issuing this AD to address latent failures of the equipment cooling system and low pressure environmental control system, which, in combination with a cargo fire event, could result in smoke in the flight deck and/or main cabin, and possible loss of aircraft control.
f Compliance Comply with this AD within the compliance times specified, unless already done.
g Repetitive Operational Tests and Corrective Actions At the applicable times identified in paragraph 1.E., Compliance of Boeing Alert Service Bulletin 73726A1137, Revision 2, dated January 27, 2020, except as required by paragraph i of this AD, do the test to verify correct operation of the smoke clearance mode of the equipment cooling system and
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Cost per product
Parts cost $0

$850

low pressure environmental control system, and do all applicable corrective actions, in accordance with the Accomplishment Instructions of Boeing Alert Service Bulletin 73726A1137, Revision 2, dated January 27, 2020. Do all applicable corrective actions before further flight. Repeat the test thereafter at intervals not to exceed 9,000 flight hours.
h Concurrent Requirements Before or concurrently with accomplishing the initial operational test required by paragraph g of this AD, install new relays and change the wiring to the environmental control system, in accordance with the Accomplishment Instructions of Boeing Alert Service Bulletin 73726A1122, Revision 3, dated January 31, 2020. When the actions required by this paragraph are performed, the installation and changes specified in paragraph 1.B. Concurrent Requirements of Boeing Alert Service Bulletin 73726A1122, Revision 3, dated January 31, 2020, must also be done.
i Exceptions to Service Information Specifications Where Boeing Alert Service Bulletin 737
26A1137, Revision 2, dated January 27, 2020, uses the phrase the R02 issue date of SB
73726A1137, this AD requires using the effective date of this AD.
j Terminating Action for AD 20160406
As of the effective date of this AD, for the airplanes identified in paragraph c of this AD only, the requirements of AD 201604
06 are terminated.
k 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 l of this AD. Information may be emailed to: 9-ANMSeattle-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
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