Airworthiness Directives; The Boeing Company Airplanes, 56840-56843 [2021-22203]

Download as PDF 56840 Proposed Rules Federal Register Vol. 86, No. 195 Wednesday, October 13, 2021 This section of the FEDERAL REGISTER contains notices to the public of the proposed issuance of rules and regulations. The purpose of these notices is to give interested persons an opportunity to participate in the rule making prior to the adoption of the final rules. DEPARTMENT OF AGRICULTURE Agricultural Marketing Service 7 CFR Part 984 [Doc. No. AMS–SC–21–0067; SC20–984–3 CR] Walnuts Grown in California; Continuance Referendum Agricultural Marketing Service, Department of Agriculture (USDA). ACTION: Referendum order. AGENCY: This document directs that a referendum be conducted among eligible California walnut growers to determine whether they favor continuance of the marketing order regulating the handling of walnuts grown in California. DATES: The referendum will be conducted from December 6 through December 31, 2021. To vote in this referendum, growers must have produced walnuts in California during the period September 1, 2020, through August 31, 2021. ADDRESSES: Copies of the marketing order may be obtained from the office of the referendum agents at 1220 SW 3rd Avenue, Suite 305, Portland, OR 97204; Telephone: (503) 326–2724; or the Office of the Docket Clerk, Marketing Order and Agreement Division, Specialty Crops Program, AMS, USDA, 1400 Independence Avenue SW, STOP 0237, Washington, DC 20250–0237; Telephone: (202) 720–2491; or on the internet at https://www.regulations.gov. FOR FURTHER INFORMATION CONTACT: Joshua R. Wilde or Gary D. Olson, Northwest Marketing Field Office, Marketing Order and Agreement Division, Specialty Crops Program, AMS, USDA, 1220 SW 3rd Avenue, Suite 305, Portland, OR 97204; Telephone: (503) 326–2724, or Email: Joshua.R.Wilde@usda.gov or GaryD.Olson@usda.gov. SUPPLEMENTARY INFORMATION: Pursuant to Marketing Agreement and Order No. 984, as amended (7 CFR part 984), jspears on DSK121TN23PROD with PROPOSALS1 SUMMARY: VerDate Sep<11>2014 16:28 Oct 12, 2021 Jkt 256001 hereinafter referred to as the ‘‘Order,’’ and applicable provisions of the Agricultural Marketing Agreement Act of 1937, as amended (7 U.S.C. 601–674), hereinafter referred to as the ‘‘Act,’’ it is hereby directed that a referendum be conducted to ascertain whether continuance of the Order is favored by the growers. The referendum shall be conducted from December 6 to December 31, 2021, among eligible California walnut growers. Only growers that were engaged in the production of walnuts in California during the period September 1, 2020, through August 31, 2021, may participate in the continuance referendum. USDA has determined that continuance referenda are an effective means for determining whether growers favor continuation of marketing order programs. The Order will continue in effect if at least two-thirds of growers voting in the referendum, or growers of at least two-thirds of the volume of California walnuts represented in the referendum, favor continuance. In evaluating merits of continuance versus termination, USDA will not exclusively consider results of the continuance referendum. USDA will also consider all other relevant information concerning the operation of the Order and relative benefits and disadvantages to growers, handlers, and consumers in order to determine whether continued operation of the Order would tend to effectuate the declared policy of the Act. In accordance with the Paperwork Reduction Act of 1995 (44 U.S.C. Chapter 35), the ballots used in the referendum have been approved by the Office of Management and Budget (OMB) and have been assigned OMB No. 0581–0178—Vegetable and Specialty Crops. It has been estimated that it will take an average of 20 minutes for each of the approximately 4,400 growers of California walnuts to cast a ballot. Participation is voluntary. Ballots postmarked after December 31, 2021, will not be included in the vote tabulation. Joshua R. Wilde and Gary D. Olson of the Northwest Marketing Field Office, Specialty Crops Program, Agricultural Marketing Service (AMS), USDA, are hereby designated as the referendum agents of the Secretary of Agriculture to conduct this referendum. The procedure applicable to the referendum shall be the ‘‘Procedure for the Conduct of PO 00000 Frm 00001 Fmt 4702 Sfmt 4702 Referenda in Connection with Marketing Orders for Fruits, Vegetables, and Nuts Pursuant to the Agricultural Marketing Agreement Act of 1937, as Amended’’ (7 CFR 900.400 through 900.407). Ballots will be mailed to all growers of record and may also be obtained from the referendum agents or from their appointees. List of Subjects in 7 CFR Part 984 Marketing agreements, Nuts, Reporting and recordkeeping requirements, Walnuts. Authority: 7 U.S.C. 601–674. Erin Morris, Associate Administrator, Agricultural Marketing Service. [FR Doc. 2021–22312 Filed 10–12–21; 8:45 am] BILLING CODE P DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14 CFR Part 39 [Docket No. FAA–2021–0788; Project Identifier AD–2021–00489–T] RIN 2120–AA64 Airworthiness Directives; The Boeing Company Airplanes Federal Aviation Administration (FAA), DOT. ACTION: Notice of proposed rulemaking (NPRM). AGENCY: The FAA proposes to adopt a new airworthiness directive (AD) for certain The Boeing Company Model 737–700, –800, and –900ER series airplanes. This proposed AD was prompted by reports of incorrectly installed fuselage skin fasteners. This proposed AD would require a detailed inspection of a certain body station bulkhead, between certain stringers, for any incorrectly installed fastener common to fuselage skin, and applicable on-condition actions. The FAA is proposing this AD to address the unsafe condition on these products. DATES: The FAA must receive comments on this proposed AD by November 29, 2021. ADDRESSES: You may send comments, using the procedures found in 14 CFR SUMMARY: E:\FR\FM\13OCP1.SGM 13OCP1 Federal Register / Vol. 86, No. 195 / Wednesday, October 13, 2021 / Proposed Rules 11.43 and 11.45, by any of the following methods: • Federal eRulemaking Portal: Go to https://www.regulations.gov. Follow the instructions for submitting comments. • Fax: 202–493–2251. • Mail: U.S. Department of Transportation, Docket Operations, M–30, West Building Ground Floor, Room W12–140, 1200 New Jersey Avenue SE, Washington, DC 20590. • Hand Delivery: Deliver to Mail address above between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays. For service information identified in this NPRM, contact Boeing Commercial Airplanes, Attention: Contractual & Data Services (C&DS), 2600 Westminster Blvd., MC 110–SK57, Seal Beach, CA 90740–5600; telephone 562–797–1717; internet https:// www.myboeingfleet.com. You may view this referenced 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 206–231– 3195. It is also available at https:// www.regulations.gov by searching for and locating Docket No. FAA–2021– 0788. jspears on DSK121TN23PROD with PROPOSALS1 Examining the AD Docket You may examine the AD docket at https://www.regulations.gov by searching for and locating Docket No. FAA–2021–0788; 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: Lu Lu, Aerospace Engineer, Airframe Section, FAA, Seattle ACO Branch, 2200 South 216th St., Des Moines, WA 98198; phone and fax: 206–231–3525; email: lu.lu@faa.gov. SUPPLEMENTARY INFORMATION: 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. FAA–2021–0788; Project Identifier AD– 2021–00489–T’’ 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 this proposal because of those comments. VerDate Sep<11>2014 16:28 Oct 12, 2021 Jkt 256001 56841 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 NPRM. loads on the bulkhead chord that could cause chord failure and adjacent skin failure, resulting in reduced control of the airplane. 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 Lu Lu, Aerospace Engineer, Airframe Section, FAA, Seattle ACO Branch, 2200 South 216th St., Des Moines, WA 98198; phone and fax: 206–231–3525; email: lu.lu@ 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. Related Service Information Under 1 CFR Part 51 The FAA reviewed Boeing Alert Requirements Bulletin 737–53A1384 RB, dated September 10, 2020. This service information specifies procedures for a detailed inspection for incorrectly installed fasteners at the STA 727 bulkhead outer chord common to the fuselage skin between stringers S–22 and S–27 on the left and right sides, and applicable on-condition actions. In addition to repair and replacement, oncondition actions include repetitive inspections for cracking of the fuselage skin between stringers S–22 and S–27; an open hole high frequency eddy current (HFEC) inspection for cracking at all incorrectly installed fastener locations; and external and internal general visual inspections for repairs of the STA 727 bulkhead. On-condition actions also include repetitive HFEC and low frequency eddy current (LFEC) inspections in unrepaired areas for cracking of the inner skin from the wheel well; of the outer, upper, and lower chords from the wheel well; and of the fail-safe chord from the cargo compartment. 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 ADDRESSES. Background The FAA has received a report indicating incorrectly installed fasteners were found at the station (STA) 727 bulkhead between stringers S–22 and S– 27. The fasteners, installed with a gap under the fastener head, were found at the STA 727 bulkhead common to fuselage skin, including the S–23 skin lap splice. Incorrectly installed fasteners are suspected to exist on airplanes delivered within a certain time period. The FAA has confirmed that the fastener installation procedures were corrected on airplanes subsequently delivered. This condition was the result of incorrect procedures used to install affected fasteners during airplane production, which could result in incorrectly installed fasteners going undetected. Continuous operation of the airplane with incorrectly installed fasteners may generate fatigue cracking that could adversely affect the structural integrity of the airplane. Gaps under fastener heads will result in bending PO 00000 Frm 00002 Fmt 4702 Sfmt 4702 FAA’s 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. Proposed AD Requirements in This NPRM This proposed AD would require accomplishing the actions specified in the service information already described except for any differences identified as exceptions in the regulatory text of this proposed AD. For information on the procedures and compliance times, see this service information at https:// www.regulations.gov by searching for and locating Docket No. FAA–2021– 0788. Costs of Compliance The FAA estimates that this AD, if adopted as proposed, would affect 78 airplanes of U.S. registry. The FAA estimates the following costs to comply with this proposed AD: E:\FR\FM\13OCP1.SGM 13OCP1 56842 Federal Register / Vol. 86, No. 195 / Wednesday, October 13, 2021 / Proposed Rules ESTIMATED COSTS Action Labor cost Inspections .............................. 13 work-hours × $85 per hour = $1,105 ................................ The FAA estimates the following costs to do any necessary actions that would be required based on the results Cost per product Parts cost of the proposed inspection. The agency has no way of determining the number $0 Cost on U.S. operators $1,105 $86,190 of aircraft that might need these oncondition actions. ON-CONDITION COSTS Action Labor cost Open hole HFEC inspections .. HFEC and LFEC inspections .. 21 work-hours × $85 per hour = $85 per inspection cycle ...... 36 work-hours × $85 per hour = $3,060 per inspection cycle The FAA has included all known costs in its cost estimate. According to the manufacturer, however, some or all of the costs of this proposed AD may be covered under warranty, thereby reducing the cost impact on affected operators. (2) Would not affect intrastate aviation in Alaska, and (3) Would not have a significant economic impact, positive or negative, on a substantial number of small entities under the criteria of the Regulatory Flexibility Act. Authority for This Rulemaking List of Subjects in 14 CFR Part 39 Title 49 of the United States Code specifies the FAA’s 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 Agency’s 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. jspears on DSK121TN23PROD with PROPOSALS1 Regulatory Findings The FAA determined that this proposed AD would not have federalism implications under Executive Order 13132. This proposed AD would 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 this proposed regulation: (1) Is not a ‘‘significant regulatory action’’ under Executive Order 12866, VerDate Sep<11>2014 16:28 Oct 12, 2021 Jkt 256001 Cost per product Parts cost $0 0 $1,785 per inspection cycle. 3,060 per inspection cycle. (d) Subject Air Transport Association (ATA) of America Code 53, Fuselage. The Proposed Amendment (e) Unsafe Condition This AD was prompted by reports of incorrectly installed fuselage skin fasteners. The FAA is issuing this AD to address incorrectly installed fasteners. This condition, if not addressed, could result in incorrectly installed fasteners going undetected. Continuous operation of the airplane with undetected incorrectly installed fasteners may generate fatigue cracking that could adversely affect the structural integrity of the airplane. Accordingly, under the authority delegated to me by the Administrator, the FAA proposes to amend 14 CFR part 39 as follows: (f) Compliance Comply with this AD within the compliance times specified, unless already done. PART 39—AIRWORTHINESS DIRECTIVES (g) Required Actions Except as specified by paragraph (h) of this AD: At the applicable times specified in the ‘‘Compliance’’ paragraph of Boeing Alert Requirements Bulletin 737–53A1384 RB, dated September 10, 2020, do all applicable actions identified in, and in accordance with, the Accomplishment Instructions of Boeing Alert Requirements Bulletin 737–53A1384 RB, dated September 10, 2020. Note 1 to paragraph (g): Guidance for accomplishing the actions required by this AD can be found in Boeing Alert Service Bulletin 737–53A1384, dated September 10, 2020, which is referred to in Boeing Alert Requirements Bulletin 737–53A1384 RB, dated September 10, 2020. Air transportation, Aircraft, Aviation safety, Incorporation by reference, Safety. 1. The authority citation for part 39 continues to read as follows: ■ Authority: 49 U.S.C. 106(g), 40113, 44701. § 39.13 [Amended] 2. The FAA amends § 39.13 by adding the following new airworthiness directive: ■ The Boeing Company: Docket No. FAA– 2021–0788; Project Identifier AD–2021– 489–T. (a) Comments Due Date The FAA must receive comments on this airworthiness directive (AD) by November 29, 2021. (b) Affected ADs None. (c) Applicability This AD applies to The Boeing Company Model 737–700, –800, and –900ER series airplanes, certificated in any category, and identified in Boeing Alert Requirements Bulletin 737–53A1384 RB, dated September 10, 2020. PO 00000 Frm 00003 Fmt 4702 Sfmt 4702 (h) Exceptions to Service Information Specifications (1) Where the ‘‘Effectivity’’ paragraph and the Condition and Compliance Time columns of the tables in the ‘‘Compliance’’ paragraph of Boeing Alert Requirements Bulletin 737– 53A1384 RB, dated September 10, 2020, use the phrase ‘‘the Original Issue date of Requirements Bulletin 737–53A1384 RB,’’ this AD requires using ‘‘the effective date of this AD.’’ (2) Where Boeing Alert Requirements Bulletin 737–53A1384 RB, dated September 10, 2020, specifies contacting Boeing for E:\FR\FM\13OCP1.SGM 13OCP1 Federal Register / Vol. 86, No. 195 / Wednesday, October 13, 2021 / Proposed Rules repair instructions or for alternative inspections: This AD requires doing the repair, or doing the alternative inspections and applicable on-condition actions, using a method approved in accordance with the procedures specified in paragraph (i) of this AD. (i) 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 responsible Flight Standards 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 (j)(1) of this AD. Information may be emailed to: 9ANM-Seattle-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 responsible Flight Standards 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 Manager, Seattle ACO Branch, FAA, to make those findings. To be approved, the repair method, modification deviation, or alteration deviation must meet the certification basis of the airplane, and the approval must specifically refer to this AD. (j) Related Information jspears on DSK121TN23PROD with PROPOSALS1 (1) For more information about this AD, contact Lu Lu, Aerospace Engineer, Airframe Section, FAA, Seattle ACO Branch, 2200 South 216th St., Des Moines, WA 98198; phone and fax: 206–231–3525; email: lu.lu@ faa.gov. (2) For service information identified in this AD, contact Boeing Commercial Airplanes, Attention: Contractual & Data Services (C&DS), 2600 Westminster Blvd., MC 110–SK57, Seal Beach, CA 90740–5600; telephone 562–797–1717; internet https:// www.myboeingfleet.com. You may view this referenced 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 206–231–3195. Issued on September 9, 2021. Lance T. Gant, Director, Compliance & Airworthiness Division, Aircraft Certification Service. [FR Doc. 2021–22203 Filed 10–12–21; 8:45 am] BILLING CODE 4910–13–P VerDate Sep<11>2014 16:28 Oct 12, 2021 Jkt 256001 DEPARTMENT OF TRANSPORTATION 56843 FOR FURTHER INFORMATION CONTACT: [Docket No. FAA–2021–0804; Airspace Docket No. 20–AWP–56] Matthew Van Der Wal, Federal Aviation Administration, Western Service Center, Operations Support Group, 2200 S 216th Street, Des Moines, WA 98198; telephone (206) 231–3695. SUPPLEMENTARY INFORMATION: RIN 2120–AA66 Authority for This Rulemaking Proposed Modification of Class D and Class E Airspace; China Lake NAWS (Armitage Field) Airport, CA The FAA’s authority to issue rules regarding aviation safety is found in Title 49 of the United States Code. Subtitle I, Section 106 describes the authority of the FAA Administrator. Subtitle VII, Aviation Programs, describes in more detail the scope of the agency’s authority. This rulemaking is promulgated under the authority described in Subtitle VII, Part A, Subpart I, Section 40103. Under that section, the FAA is charged with prescribing regulations to assign the use of airspace necessary to ensure the safety of aircraft and the efficient use of airspace. This regulation is within the scope of that authority, as it would modify the Class D and Class E airspace at China Lake NAWS (Armitage Field) Airport, China Lake, CA, to support IFR operations at the airport. Federal Aviation Administration 14 CFR Part 71 Federal Aviation Administration (FAA), DOT. ACTION: Notice of proposed rulemaking (NPRM). AGENCY: This action proposes to modify the Class D airspace at China Lake NAWS (Armitage Field) Airport, China Lake, CA. This action also proposes to modify the Class E airspace extending upward from 700 feet above the surface. Additionally, this action proposes to remove the China Lake (Navy) TACAN from the Class E5 text header and airspace description. Lastly, this action proposes numerous administrative updates to the Class D and Class E5 text headers and the Class D airspace description. This action would ensure the safety and management of instrument flight rules (IFR) operations at the airport. DATES: Comments must be received on or before November 29, 2021. ADDRESSES: Send comments on this proposal to the U.S. Department of Transportation, Docket Operations, 1200 New Jersey Avenue SE, West Building Ground Floor, Room W12–140, Washington, DC 20590; telephone: 1– 800–647–5527, or (202) 366–9826. You must identify FAA Docket No. FAA– 2021–0804; Airspace Docket No. 20– AWP–56, at the beginning of your comments. You may also submit comments through the internet at https://www.regulations.gov. FAA Order JO 7400.11F, Airspace Designations and Reporting Points, and subsequent amendments can be viewed online at https://www.faa.gov/air_ traffic/publications/. For further information, you can contact the Airspace Policy Group, Federal Aviation Administration, 800 Independence Avenue SW, Washington, DC 20591; telephone: (202) 267–8783. The Order is also available for inspection at the National Archives and Records Administration (NARA). For information on the availability of FAA Order JO 7400.11F at NARA, email fr.inspection@nara.gov or go to https:// www.archives.gov/federal-register/cfr/ ibr-locations.html. SUMMARY: PO 00000 Frm 00004 Fmt 4702 Sfmt 4702 Comments Invited Interested parties are invited to participate in this proposed rulemaking by submitting such written data, views, or arguments, as they may desire. Comments that provide the factual basis supporting the views and suggestions presented are particularly helpful in developing reasoned regulatory decisions on the proposal. Comments are specifically invited on the overall regulatory, aeronautical, economic, environmental, and energy-related aspects of the proposal. Communications should identify both docket numbers and be submitted in triplicate to the address listed above. Persons wishing the FAA to acknowledge receipt of their comments on this notice must submit with those comments a self-addressed, stamped postcard on which the following statement is made: ‘‘Comments to Docket No. FAA–2021–0804; Airspace Docket No. 20–AWP–56’’. The postcard will be date/time stamped and returned to the commenter. All communications received before the specified closing date for comments will be considered before taking action on the proposed rule. The proposal contained in this notice may be changed in light of the comments received. A report summarizing each substantive public contact with FAA personnel concerned with this rulemaking will be filed in the docket. E:\FR\FM\13OCP1.SGM 13OCP1

Agencies

[Federal Register Volume 86, Number 195 (Wednesday, October 13, 2021)]
[Proposed Rules]
[Pages 56840-56843]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2021-22203]


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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2021-0788; Project Identifier AD-2021-00489-T]
RIN 2120-AA64


Airworthiness Directives; The Boeing Company Airplanes

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Notice of proposed rulemaking (NPRM).

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SUMMARY: The FAA proposes to adopt a new airworthiness directive (AD) 
for certain The Boeing Company Model 737-700, -800, and -900ER series 
airplanes. This proposed AD was prompted by reports of incorrectly 
installed fuselage skin fasteners. This proposed AD would require a 
detailed inspection of a certain body station bulkhead, between certain 
stringers, for any incorrectly installed fastener common to fuselage 
skin, and applicable on-condition actions. The FAA is proposing this AD 
to address the unsafe condition on these products.

DATES: The FAA must receive comments on this proposed AD by November 
29, 2021.

ADDRESSES: You may send comments, using the procedures found in 14 CFR

[[Page 56841]]

11.43 and 11.45, by any of the following methods:
     Federal eRulemaking Portal: Go to https://www.regulations.gov. Follow the instructions for submitting comments.
     Fax: 202-493-2251.
     Mail: U.S. Department of Transportation, Docket 
Operations, M-30, West Building Ground Floor, Room W12-140, 1200 New 
Jersey Avenue SE, Washington, DC 20590.
     Hand Delivery: Deliver to Mail address above between 9 
a.m. and 5 p.m., Monday through Friday, except Federal holidays.
    For service information identified in this NPRM, contact Boeing 
Commercial Airplanes, Attention: Contractual & Data Services (C&DS), 
2600 Westminster Blvd., MC 110-SK57, Seal Beach, CA 90740-5600; 
telephone 562-797-1717; internet https://www.myboeingfleet.com. You may 
view this referenced 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 206-231-3195. It is also available at https://www.regulations.gov by searching for and locating Docket No. FAA-2021-
0788.

Examining the AD Docket

    You may examine the AD docket at https://www.regulations.gov by 
searching for and locating Docket No. FAA-2021-0788; 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:  Lu Lu, Aerospace Engineer, Airframe 
Section, FAA, Seattle ACO Branch, 2200 South 216th St., Des Moines, WA 
98198; phone and fax: 206-231-3525; email: [email protected].

SUPPLEMENTARY INFORMATION:

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. FAA-2021-0788; Project Identifier 
AD-2021-00489-T'' 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 
this 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 NPRM.

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 Lu 
Lu, Aerospace Engineer, Airframe Section, FAA, Seattle ACO Branch, 2200 
South 216th St., Des Moines, WA 98198; phone and fax: 206-231-3525; 
email: [email protected]. 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 has received a report indicating incorrectly installed 
fasteners were found at the station (STA) 727 bulkhead between 
stringers S-22 and S-27. The fasteners, installed with a gap under the 
fastener head, were found at the STA 727 bulkhead common to fuselage 
skin, including the S-23 skin lap splice. Incorrectly installed 
fasteners are suspected to exist on airplanes delivered within a 
certain time period. The FAA has confirmed that the fastener 
installation procedures were corrected on airplanes subsequently 
delivered. This condition was the result of incorrect procedures used 
to install affected fasteners during airplane production, which could 
result in incorrectly installed fasteners going undetected. Continuous 
operation of the airplane with incorrectly installed fasteners may 
generate fatigue cracking that could adversely affect the structural 
integrity of the airplane. Gaps under fastener heads will result in 
bending loads on the bulkhead chord that could cause chord failure and 
adjacent skin failure, resulting in reduced control of the airplane.

FAA's 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 Alert Requirements Bulletin 737-53A1384 RB, 
dated September 10, 2020. This service information specifies procedures 
for a detailed inspection for incorrectly installed fasteners at the 
STA 727 bulkhead outer chord common to the fuselage skin between 
stringers S-22 and S-27 on the left and right sides, and applicable on-
condition actions. In addition to repair and replacement, on-condition 
actions include repetitive inspections for cracking of the fuselage 
skin between stringers S-22 and S-27; an open hole high frequency eddy 
current (HFEC) inspection for cracking at all incorrectly installed 
fastener locations; and external and internal general visual 
inspections for repairs of the STA 727 bulkhead. On-condition actions 
also include repetitive HFEC and low frequency eddy current (LFEC) 
inspections in unrepaired areas for cracking of the inner skin from the 
wheel well; of the outer, upper, and lower chords from the wheel well; 
and of the fail-safe chord from the cargo compartment.
    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 ADDRESSES.

Proposed AD Requirements in This NPRM

    This proposed AD would require accomplishing the actions specified 
in the service information already described except for any differences 
identified as exceptions in the regulatory text of this proposed AD. 
For information on the procedures and compliance times, see this 
service information at https://www.regulations.gov by searching for and 
locating Docket No. FAA-2021-0788.

Costs of Compliance

    The FAA estimates that this AD, if adopted as proposed, would 
affect 78 airplanes of U.S. registry. The FAA estimates the following 
costs to comply with this proposed AD:

[[Page 56842]]



                                                 Estimated Costs
----------------------------------------------------------------------------------------------------------------
                                                                                     Cost per      Cost on U.S.
               Action                         Labor cost            Parts cost        product        operators
----------------------------------------------------------------------------------------------------------------
Inspections........................  13 work-hours x $85 per                  $0          $1,105         $86,190
                                      hour = $1,105.
----------------------------------------------------------------------------------------------------------------

    The FAA estimates the following costs to do any necessary actions 
that would be required based on the results of the proposed inspection. 
The agency has no way of determining the number of aircraft that might 
need these on-condition actions.

                                               On-Condition Costs
----------------------------------------------------------------------------------------------------------------
                Action                            Labor cost              Parts cost        Cost per product
----------------------------------------------------------------------------------------------------------------
Open hole HFEC inspections............  21 work-hours x $85 per hour =              $0  $1,785 per inspection
                                         $85 per inspection cycle.                       cycle.
HFEC and LFEC inspections.............  36 work-hours x $85 per hour =               0  3,060 per inspection
                                         $3,060 per inspection cycle.                    cycle.
----------------------------------------------------------------------------------------------------------------

    The FAA has included all known costs in its cost estimate. 
According to the manufacturer, however, some or all of the costs of 
this proposed AD may be covered under warranty, thereby reducing the 
cost impact on affected operators.

Authority for This Rulemaking

    Title 49 of the United States Code specifies the FAA's 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 Agency's 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

    The FAA determined that this proposed AD would not have federalism 
implications under Executive Order 13132. This proposed AD would 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 this proposed 
regulation:
    (1) Is not a ``significant regulatory action'' under Executive 
Order 12866,
    (2) Would not affect intrastate aviation in Alaska, and
    (3) Would not have a significant economic impact, positive or 
negative, on a substantial number of small entities under the criteria 
of the Regulatory Flexibility Act.

List of Subjects in 14 CFR Part 39

    Air transportation, Aircraft, Aviation safety, Incorporation by 
reference, Safety.

The Proposed Amendment

    Accordingly, under the authority delegated to me by the 
Administrator, the FAA proposes to amend 14 CFR part 39 as follows:

PART 39--AIRWORTHINESS DIRECTIVES

0
1. The authority citation for part 39 continues to read as follows:

    Authority:  49 U.S.C. 106(g), 40113, 44701.


Sec.  39.13  [Amended]

0
2. The FAA amends Sec.  39.13 by adding the following new airworthiness 
directive:

The Boeing Company: Docket No. FAA-2021-0788; Project Identifier AD-
2021-489-T.

(a) Comments Due Date

    The FAA must receive comments on this airworthiness directive 
(AD) by November 29, 2021.

(b) Affected ADs

    None.

(c) Applicability

    This AD applies to The Boeing Company Model 737-700, -800, and -
900ER series airplanes, certificated in any category, and identified 
in Boeing Alert Requirements Bulletin 737-53A1384 RB, dated 
September 10, 2020.

(d) Subject

    Air Transport Association (ATA) of America Code 53, Fuselage.

(e) Unsafe Condition

    This AD was prompted by reports of incorrectly installed 
fuselage skin fasteners. The FAA is issuing this AD to address 
incorrectly installed fasteners. This condition, if not addressed, 
could result in incorrectly installed fasteners going undetected. 
Continuous operation of the airplane with undetected incorrectly 
installed fasteners may generate fatigue cracking that could 
adversely affect the structural integrity of the airplane.

(f) Compliance

    Comply with this AD within the compliance times specified, 
unless already done.

(g) Required Actions

    Except as specified by paragraph (h) of this AD: At the 
applicable times specified in the ``Compliance'' paragraph of Boeing 
Alert Requirements Bulletin 737-53A1384 RB, dated September 10, 
2020, do all applicable actions identified in, and in accordance 
with, the Accomplishment Instructions of Boeing Alert Requirements 
Bulletin 737-53A1384 RB, dated September 10, 2020.

    Note 1 to paragraph (g): Guidance for accomplishing the actions 
required by this AD can be found in Boeing Alert Service Bulletin 
737-53A1384, dated September 10, 2020, which is referred to in 
Boeing Alert Requirements Bulletin 737-53A1384 RB, dated September 
10, 2020.

(h) Exceptions to Service Information Specifications

    (1) Where the ``Effectivity'' paragraph and the Condition and 
Compliance Time columns of the tables in the ``Compliance'' 
paragraph of Boeing Alert Requirements Bulletin 737-53A1384 RB, 
dated September 10, 2020, use the phrase ``the Original Issue date 
of Requirements Bulletin 737-53A1384 RB,'' this AD requires using 
``the effective date of this AD.''
    (2) Where Boeing Alert Requirements Bulletin 737-53A1384 RB, 
dated September 10, 2020, specifies contacting Boeing for

[[Page 56843]]

repair instructions or for alternative inspections: This AD requires 
doing the repair, or doing the alternative inspections and 
applicable on-condition actions, using a method approved in 
accordance with the procedures specified in paragraph (i) of this 
AD.

(i) 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 responsible Flight Standards 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 (j)(1) of this AD. Information may be 
emailed to: [email protected].
    (2) Before using any approved AMOC, notify your appropriate 
principal inspector, or lacking a principal inspector, the manager 
of the responsible Flight Standards 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 Manager, Seattle 
ACO Branch, FAA, to make those findings. To be approved, the repair 
method, modification deviation, or alteration deviation must meet 
the certification basis of the airplane, and the approval must 
specifically refer to this AD.

(j) Related Information

    (1) For more information about this AD, contact Lu Lu, Aerospace 
Engineer, Airframe Section, FAA, Seattle ACO Branch, 2200 South 
216th St., Des Moines, WA 98198; phone and fax: 206-231-3525; email: 
[email protected].
    (2) For service information identified in this AD, contact 
Boeing Commercial Airplanes, Attention: Contractual & Data Services 
(C&DS), 2600 Westminster Blvd., MC 110-SK57, Seal Beach, CA 90740-
5600; telephone 562-797-1717; internet https://www.myboeingfleet.com. You may view this referenced 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 206-231-3195.

    Issued on September 9, 2021.
Lance T. Gant,
Director, Compliance & Airworthiness Division, Aircraft Certification 
Service.
[FR Doc. 2021-22203 Filed 10-12-21; 8:45 am]
BILLING CODE 4910-13-P