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Federal Register / Vol. 86, No. 35 / Wednesday, February 24, 2021 / Proposed Rules For service information identified in this SNPRM, 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 on the internet at https www.regulations.gov by searching for and locating Docket No.
FAA20190862.
Examining the AD Docket You may examine the AD docket on the internet at https
www.regulations.gov by searching for and locating Docket No. FAA2019
0862; 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 SNPRM, any comments received, and other information. The street address for Docket Operations is listed above.
FOR FURTHER INFORMATION CONTACT:
Wayne Lockett, Aerospace Engineer, Airframe Section, FAA, Seattle ACO
Branch, 2200 South 216th St., Des Moines, WA 98198; phone and fax: 206
2313524; email: wayne.lockett@
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.
FAA20190862; Product Identifier 2019NM121AD 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 SNPRM
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 SNPRM, 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 SNPRM. Submissions containing CBI should be sent to 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. Any commentary that the FAA receives which is not specifically designated as CBI will be placed in the public docket for this rulemaking.
Discussion The FAA issued an NPRM to amend 14 CFR part 39 by adding an AD that would apply to certain The Boeing Company Model 767200, 300, 300F, and 400ER series airplanes. The NPRM
published in the Federal Register on November 7, 2019 84 FR 60007. The NPRM was prompted by a determination that new or more restrictive airworthiness limitations are necessary. The NPRM proposed to require revising the existing maintenance or inspection program, as applicable, to incorporate new or more restrictive airworthiness limitations.
Actions Since the NPRM Was Issued Since the FAA issued the NPRM, the manufacturer has issued new or more restrictive airworthiness limitations, and the FAA has determined it is necessary to mandate those limitations.
In addition, the FAA has determined that those new limitations apply to more airplanes than were included in the NPRM.
Comments The FAA gave the public the opportunity to comment on the NPRM.
The following presents the comments received on the NPRM and the FAAs response to each comment.

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Request To Clarify Compliance Time for Paragraph h2 of the Proposed AD
Boeing, American Airlines, and United Parcel Service UPS requested that the FAA clarify the compliance time for the actions described in paragraph h2 of the proposed AD.
The commenters noted that no compliance time had been given for obtaining the revised inspection intervals as directed in that paragraph, and recommended a period of 24
months.
The FAA agrees to clarify that for any horizontal stabilizer pivot fitting lug SSI 5510I13A on which a lug bore oversize repair has been accomplished, the compliance time for obtaining revised inspection intervals is within 24
months after the effective date of this AD, which is the compliance time for revising the maintenance or inspection program as specified in paragraph g of this proposed AD. The FAA has revised paragraph h2 of this proposed AD to include the specified compliance time.
Request To Clarify New Inspection Intervals American Airlines asked that paragraph h2 of the proposed AD be further clarified to state that the lug bore oversize repairs must be re-evaluated and revised intervals must be obtained, as applicable. American Airlines reasoned that revised inspection intervals might not be required after reevaluation, based on language in the Differences Between This Proposed AD
and the Service Information section of the proposed AD that stated repairs will require further evaluation to determine the applicable inspection interval to be incorporated.
The FAA agrees with the commenters request. The FAA acknowledges that upon further evaluation of the repair, it is possible certain intervals might not be revised, and the inspection program provided in the original approved alternative method of compliance AMOC for that repair would still be acceptable. The FAA has revised paragraph h2 of this proposed AD to clarify that the requirement is to reevaluate the repair and obtain revised inspection intervals, as applicable.
Request To Modify Applicability Paragraph of the Proposed AD
Aviation Partners Boeing APB
requested that paragraph c of the proposed AD be amended to include language advising that a change in product AMOC approval may be needed for airplanes with Supplemental Type Certificate STC ST01920SE
installed. APB stated that installation of
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