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Federal Register / Vol. 86, No. 33 / Monday, February 22, 2021 / Rules and Regulations 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.
Since issuance of that AD, the FAA
has determined that additional actions are necessary to address the same unsafe condition identified in AD 20160406
for The Boeing Company Model 737
700 series airplanes having line numbers L/Ns 481, 545, 684, 979, 1089, 1211, and 1223. Those actions have been included in the revised service information specified in paragraphs g and h of this AD. This AD adds the requirements of paragraph h that include installing new relays and changing the wiring to the environmental control system, and accomplishing certain concurrent actions, for the affected airplanes.
Relationship Between This AD and AD
20160406
This AD does not supersede AD
20160406. Rather, the FAA has determined that a stand-alone AD
would be more appropriate to address the requirements of this AD. AD 2016
0406 did not address the unsafe condition for the 7 airplanes mentioned previously and identified in paragraph c of this AD. To address the unsafe condition for these 7 airplanes, this AD
requires repetitive testing to verify correct operation of the smoke clearance mode of the equipment cooling system and low pressure environmental control system, and corrective actions if necessary; and also requires installing new relays and changing the wiring to the environmental control system, and accomplishing certain concurrent actions. As such, this AD terminates all of the requirements of AD 20160406
for the airplanes identified in paragraph c of this AD only.
Related Service Information Under 1
CFR Part 51
The FAA reviewed the following service information:
Boeing Alert Service Bulletin 737
26A1122, Revision 3, dated January 31, 2020. This service information describes procedures for installing new relays and changing the wiring to the environmental control system.

Boeing Alert Service Bulletin 737
26A1137, Revision 2, dated January 27, 2020. This service information describes procedures for repetitive testing to verify correct operation of the smoke clearance mode of the equipment cooling system and low pressure environmental control system, and applicable corrective actions.
This service information is reasonably available because the interested parties have access to it through their normal course of business or by the means identified in the ADDRESSES section.
FAAs Determination The FAA is issuing this AD because the agency evaluated all the relevant information and determined the unsafe condition described previously is likely to exist or develop in other products of the same type design.
AD Requirements This AD requires accomplishing the actions specified in the service information described previously.
FAAs Justification and Determination of the Effective Date There are currently no domestic operators of these products. Therefore, the FAA finds that notice and opportunity for prior public comment are unnecessary and that good cause exists for making this amendment effective in less than 30 days.
Comments Invited This AD is a final rule that involves requirements affecting flight safety and was not preceded by notice and an opportunity for public comment.
However, the FAA invites you to send any written data, views, or arguments about this final rule. Send your comments to an address listed under the ADDRESSES section. Include Docket No.
FAA20201109 and Product Identifier 2020NM067AD at the beginning of your comments. The FAA specifically invites comments on the overall regulatory, economic, environmental, and energy aspects of this final rule. The FAA will consider all comments received by the closing date and may amend this final rule because of those comments.
Except for Confidential Business Information CBI as described in the following paragraph, and other
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information as described in 14 CFR
11.35, the FAA will post all comments received, without change, as well as a report summarizing each substantive public contact with FAA personnel concerning this AD. The FAA will consider all comments received by the closing date for comments. The FAA
may amend this AD because of those comments.
Confidential Business Information CBI is commercial or financial information that is both customarily and actually treated as private by its owner.
Under the Freedom of Information Act FOIA 5 U.S.C. 552, CBI is exempt from public disclosure. If your comments responsive to this AD contain commercial or financial information that is customarily treated as private, that you actually treat as private, and that is relevant or responsive to this AD, it is important that you clearly designate the submitted comments as CBI. Please mark each page of your submission containing CBI as PROPIN. The FAA
will treat such marked submissions as confidential under the FOIA, and they will not be placed in the public docket of this AD. Submissions containing CBI
should be sent to Susan L. Monroe, Aerospace Engineer, Cabin Safety and Environmental Systems Section, FAA, Seattle ACO Branch, 2200 South 216th St., Des Moines, WA 98198; phone and fax: 2062313570; email:
susan.l.monroe@faa.gov. Any commentary that the FAA receives that is not specifically designated as CBI will be placed in the public docket for this rulemaking.
Regulatory Flexibility Act RFA
The requirements of the RFA do not apply when an agency finds good cause pursuant to 5 U.S.C. 553 to adopt a rule without prior notice and comment.
Because the FAA has determined that it has good cause to adopt this rule without notice and comment, RFA
analysis is not required.
Costs of Compliance Currently, there are no affected U.S.registered airplanes. For any affected airplane that is imported and placed on the U.S. Register in the future, the FAA
provides the following cost estimates to comply with this AD:

tkelley on DSKBCP9HB2PROD with RULES

ESTIMATED COSTS
Action
Labor cost
Operational Test
New relays/wiring changes

4 work-hours $85 per hour = $340 per test cycle
104 work hours $85 per hour = $8,840

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16:23 Feb 19, 2021

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Parts cost
E:FRFM22FER1.SGM

$0
11,417

22FER1

Cost per product $340 per test cycle.
$20,257.