Voglio sapere a riguardo di…

Federal Register / Vol. 86, No. 12 / Thursday, January 21, 2021 / Proposed Rules C&DS, 2600 Westminster Blvd., MC
110SK57, Seal Beach, CA 907405600;
telephone 5627971717; internet https www.myboeingfleet.com.
For Aviation Partners Boeing service information identified in this SNPRM, contact Aviation Partners Boeing, 2811
South 102nd St., Suite 200, Seattle, WA
98168; phone: 2068307699; fax: 206
7670535; email: leng@
aviationpartners.com; internet: http
www.aviationpartnersboeing.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. Boeing Alert Requirements Bulletin 73757A1349
RB, dated April 14, 2020, is also available on the internet at https
www.regulations.gov by searching for and locating Docket No. FAA2020
0587.
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. FAA2020
0587; 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.
Comments will be available in the AD
docket shortly after receipt.
FOR FURTHER INFORMATION CONTACT:
Wayne Ha, Aerospace Engineer, Airframe Section, FAA, Los Angeles ACO Branch, 3960 Paramount Boulevard, Lakewood, CA 907124137;
phone: 5626275238; fax: 562627
5210; email: wayne.ha@faa.gov.
SUPPLEMENTARY INFORMATION:

jbell on DSKJLSW7X2PROD with PROPOSALS

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.
FAA20200587; Product Identifier 2020NM086AD 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
VerDate Sep<11>2014

15:58 Jan 19, 2021

Jkt 253001

information as described in 14 CFR
11.35, the FAA will post all comments we receive, 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 we receive about this proposed AD.
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 Ha, Aerospace Engineer, Airframe Section, FAA, Los Angeles ACO Branch, 3960
Paramount Boulevard, Lakewood, CA
907124137; phone: 5626275238; fax:
5626275210; email: wayne.ha@
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 all The Boeing Company Model 737100, 200, 200C, 300, 400, and 500 series airplanes. The NPRM published in the Federal Register on July 28, 2020 85 FR 45355.
The NPRM was prompted by crack indications found in the lower aft wing skin bolt holes where the flap tracks attach to the track support fitting. The NPRM proposed to require repetitive inspections for cracking of the left and right wing, lower aft wing skin aft edge, at certain flap track locations, and applicable on-condition actions.
Actions Since the NPRM Was Issued Since the FAA issued the NPRM, the FAA determined that the compliance time should be reduced for airplanes on which Aviation Partners Boeing APB
blended winglets have been installed using supplemental type certificate STC ST01219SE.

PO 00000

Frm 00009

Fmt 4702

Sfmt 4702

6277

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.
Support for the NPRM
One commenter, Jesse Smith, agreed with the intent of the NPRM.
Request To Reduce Compliance Time for Certain Airplanes APB asked that the FAA revise this AD to reduce the compliance times required for accomplishing the specified actions for airplanes that have incorporated STC ST01219SE. APB
stated that it issued APB Alert Service Bulletin AP737C57003, dated July 28, 2020, which contains the same actions as those specified in Boeing Alert Requirements Bulletin 73757A1349
RB, dated April 14, 2020, which is the source of service information for the actions specified in this proposed AD, with reduced compliance times for those airplanes, and, if approved by the FAA, could be added to paragraphs g and h of the proposed AD.
The FAA agrees with the commenters request, and has reviewed Aviation Partners Boeing Alert Service Bulletin AP737C57003, dated July 28, 2020.
The FAA revised paragraph g of this proposed AD, including adding paragraphs g1 and 2 of this proposed AD. Paragraph g2 of this proposed AD specifies, for airplanes on which winglets are installed using STC
ST01219SE, doing the required actions in Boeing Alert Requirements Bulletin 73757A1349 RB, dated April 14, 2020, at the compliance times in Aviation Partners Boeing Alert Service Bulletin AP737C57003, dated July 28, 2020.
The FAA has also added paragraphs h4 and 5 of this proposed AD to provide exceptions to Aviation Partners Boeing Alert Service Bulletin AP737C
57003, dated July 28, 2020.
Request To Clarify Discussion Section Boeing asked that the Discussion section of the NPRM be clarified by removing This condition, if not addressed from the description of the unsafe condition, and instead starting the sentence with undetected cracking in the lower wing skin could result. . . . Boeing stated that the term this condition, is not clearly defined and may lead to confusion. Boeing added that Boeing Alert Requirements Bulletin 73757A1349 RB, dated April 14, 2020, describes inspections for cracking, and removing that language will more specifically indicate the unsafe condition being addressed in the
E:FRFM21JAP1.SGM

21JAP1