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Federal Register / Vol. 86, No. 123 / Wednesday, June 30, 2021 / Proposed Rules
For service information identified in this NPRM, 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 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.
It is also available at https
www.regulations.gov by searching for and locating Docket No. FAA2021
0504.
Examining the AD Docket You may examine the AD docket at https www.regulations.gov by searching for and locating Docket No.
FAA20210504; or in person at Docket Operations between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays. The AD docket contains this NPRM, any comments received, and other information. The street address for Docket Operations is listed above.
FOR FURTHER INFORMATION CONTACT:

Tony Koung, Aerospace Engineer, Cabin Safety and Environmental Systems Section, FAA, Seattle ACO Branch, 2200
South 216th St., Des Moines, WA 98198;
phone and fax: 2062313985; email:
tony.koung@faa.gov.
SUPPLEMENTARY INFORMATION:

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Comments Invited The FAA invites you to send any written relevant data, views, or arguments about this proposal. Send your comments to an address listed under ADDRESSES. Include Docket No.
FAA20210504; Project Identifier AD
202001380T at the beginning of your comments. The most helpful comments reference a specific portion of the proposal, explain the reason for any recommended change, and include supporting data. The FAA will consider all comments received by the closing date and may amend the proposal because of those comments.
Except for Confidential Business Information CBI as described in the following paragraph, and other information as described in 14 CFR
11.35, the FAA will post all comments received, without change, to https
www.regulations.gov, including any personal information you provide. The agency will also post a report summarizing each substantive verbal contact received about this proposed AD.

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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 NPRM
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 NPRM, 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 NPRM. Submissions containing CBI
should be sent to Tony Koung, Aerospace Engineer, Cabin Safety and Environmental Systems Section, FAA, Seattle ACO Branch, 2200 South 216th St., Des Moines, WA 98198; phone and fax: 2062313985; email: tony.koung@
faa.gov. Any commentary that the FAA
receives which is not specifically designated as CBI will be placed in the public docket for this rulemaking.
Background The FAA issued AD 20190326, Amendment 3919578 84 FR 7266, March 4, 2019 AD 20190326, for certain The Boeing Company Model 737600, 700, 700C, 800, 900, and 900ER series airplanes. AD 201903
26 was prompted by reports of PSUs becoming detached from the supporting airplane structure in several Model 737
series airplanes. AD 20190326
requires modifying the PSUs and life vest panels by replacing the existing inboard lanyard and installing two new lanyards on the outboard edge of the PSUs and life vest panels; measuring the distance between the hooks of the torsion spring of the lanyard assembly;
replacing discrepant lanyard assemblies;
and re-identifying serviceable lanyard assemblies. The agency issued AD
20190326 to address PSUs and life vest panels detaching from the supporting airplane structure, which could lead to passenger injuries and impede passenger and crew egress during evacuation.
Actions Since AD 20190326 Was Issued Since the FAA issued AD 201903
26, Boeing found that, in the service information required by AD 201903
26, some airplanes were not assigned to the correct group and configuration. In addition, Boeing determined that the
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service information had missing or incorrect re-identification part numbers for those PSUs that were modified using Boeing Service Bulletin 737351107.
The FAA determined that the new requirements in this proposed AD
would take a minimal amount of time to accomplish. Therefore, the proposed compliance time would remain the same as the time required by AD 2019
0326 within 60 months after April 8, 2019 the effective date of AD 201903
26.
FAAs Determination The FAA is issuing this NPRM after determining that the unsafe condition described previously is likely to exist or develop on other products of the same type design.
Related Service Information Under 1
CFR Part 51
The FAA reviewed Boeing Special Attention Service Bulletin 73725
1707, Revision 2, dated July 27, 2020.
This service information specifies procedures for modifying the PSUs and life vest panels by: Replacing the existing inboard lanyard and installing two new lanyards on the outboard edge of the PSUs and life vest panels secondary retention features;
measuring the distance between the hooks of the torsion spring of the lanyard assembly; replacing any discrepant lanyard assemblies; and reidentifying serviceable lanyard assemblies. For some airplanes, the service information specifies procedures for inspecting PSUs for correct reidentification part numbers and, if necessary, re-identifying the PSU. 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.
Proposed AD Requirements in This NPRM
Although this proposed AD does not explicitly restate the requirements of AD
20190326, this proposed AD would retain all of the requirements of AD
20190326. Those requirements are referenced in the service information identified previously, which, in turn, is referenced in paragraph g of this proposed AD. This proposed AD would add additional actions for certain airplanes. This proposed AD would also require accomplishment of the actions identified as RC required for compliance in the Accomplishment Instructions of Boeing Special Attention Service Bulletin 737251707, Revision 2, dated July 27, 2020, described previously, except as discussed under
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