Airworthiness Directives; The Boeing Company Airplanes, 21946-21948 [2018-09977]

Download as PDF 21946 Federal Register / Vol. 83, No. 92 / Friday, May 11, 2018 / Proposed Rules at the previously mentioned address in the FOR FURTHER INFORMATION CONTACT section. A 30-day comment period is provided to allow interested persons to respond to this proposal. All written comments timely received will be considered before a final determination is made on this matter. List of Subjects in 7 CFR Part 930 Marketing agreements, Reporting and recordkeeping requirements, Tart cherries. For the reasons set forth in the preamble, 7 CFR part 930 is proposed to be amended as follows: PART 930—TART CHERRIES GROWN IN THE STATES OF MICHIGAN, NEW YORK, PENNSYLVANIA, OREGON, UTAH, WASHINGTON, AND WISCONSIN 1. The authority citation for 7 CFR part 930 continues to read as follows: ■ Authority: 7 U.S.C. 601–674. 2. Revise § 930.256 and its heading title to read as follows: ■ § 930.256 Free and restricted percentages for the 2017–18 crop year. The percentages for tart cherries handled by handlers during the crop year beginning on July 1, 2017, which shall be free and restricted, respectively, are designated as follows: Free percentage, 69 percent and restricted percentage, 31 percent. Dated: May 8, 2018. Bruce Summers, Acting Administrator, Agricultural Marketing Service. [FR Doc. 2018–10083 Filed 5–10–18; 8:45 am] BILLING CODE 3410–02–P DEPARTMENT OF TRANSPORTATION Federal Aviation Administration –200C, –300, –400, and –500 series airplanes. This proposed AD was prompted by a report indicating that cracks were found on the fuselage frame webs at stations forward and aft of the overwing emergency exits between stringers S–7 and S–8. This proposed AD would require repetitive high frequency eddy current (HFEC) inspections for cracking of the fuselage frame webs at certain stations between stringers S–7 and S–8 and applicable on-condition actions. We are proposing this AD to address the unsafe condition on these products. DATES: We must receive comments on this proposed AD by June 25, 2018. ADDRESSES: You may send comments, using the procedures found in 14 CFR 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, Transport Standards 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 on the internet at https://www.regulations.gov by searching for and locating Docket No. FAA–2018–0392. 14 CFR Part 39 Examining the AD Docket [Docket No. FAA–2018–0392; Product Identifier 2018–NM–044–AD] You may examine the AD docket on the internet at https:// www.regulations.gov by searching for and locating Docket No. FAA–2018– 0392; 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, the regulatory evaluation, any comments received, and other information. The street address for Docket Operations (phone: 800–647–5527) is in the ADDRESSES section. Comments will be available in the AD docket shortly after receipt. sradovich on DSK3GMQ082PROD with PROPOSALS RIN 2120–AA64 Airworthiness Directives; The Boeing Company Airplanes Federal Aviation Administration (FAA), DOT. ACTION: Notice of proposed rulemaking (NPRM). AGENCY: We propose to adopt a new airworthiness directive (AD) for all The Boeing Company Model 737–100, –200, SUMMARY: VerDate Sep<11>2014 17:56 May 10, 2018 Jkt 244001 PO 00000 Frm 00006 Fmt 4702 Sfmt 4702 FOR FURTHER INFORMATION CONTACT: David Truong, Aerospace Engineer, Airframe Section, FAA, Los Angeles ACO Branch, 3960 Paramount Boulevard, Lakewood, CA 90712–4137; phone: 562–627–5224; fax: 562–627– 5210; email: david.truong@faa.gov. SUPPLEMENTARY INFORMATION: Comments Invited We invite you to send any written relevant data, views, or arguments about this proposal. Send your comments to an address listed under the ADDRESSES section. Include ‘‘Docket No. FAA– 2018–0392; Product Identifier 2018– NM–044–AD’’ at the beginning of your comments. We specifically invite comments on the overall regulatory, economic, environmental, and energy aspects of this NPRM. We will consider all comments received by the closing date and may amend this NPRM because of those comments. We will post all comments we receive, without change, to https:// www.regulations.gov, including any personal information you provide. We will also post a report summarizing each substantive verbal contact we receive about this proposed AD. Discussion We have received a report indicating that cracks were found on the fuselage frame webs at stations forward and aft of the overwing emergency exits between stringers S–7 and S–8. Cracks were found at multiple stations and ranged in length from 2.4 inches to 2.55 inches. The cracks started at the end fastener common to the uppermost shear tie above the emergency exit doors, where there is high load transfer due to high shear flows around the emergency exit doors. The cracks are the result of fatigue loading caused by cyclic pressurization of the fuselage. This condition, if not addressed, could result in fuselage frame web cracking, which may lead to subsequent failure of the surrounding structure, and ultimately result in rapid decompression and loss of structural integrity of the airplane. Related Service Information Under 1 CFR Part 51 We reviewed Boeing Alert Requirements Bulletin 737–53A1371 RB, dated January 19, 2018. The service information describes procedures for repetitive HFEC inspections for cracking of the fuselage frame webs at certain stations between stringers S–7 and S–8 and applicable on-condition actions. The on-condition action is repair. This service information is reasonably available because the interested parties E:\FR\FM\11MYP1.SGM 11MYP1 21947 Federal Register / Vol. 83, No. 92 / Friday, May 11, 2018 / Proposed Rules 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–2018– 0392. have access to it through their normal course of business or by the means identified in the ADDRESSES section. FAA’s Determination We are proposing this AD because we 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. Explanation of Requirements Bulletin The FAA worked in conjunction with industry, under the Airworthiness Directives Implementation Aviation Rulemaking Committee (AD ARC), to enhance the AD system. One enhancement is a process for annotating which steps in the service information are ‘‘required for compliance’’ (RC) with an AD. Boeing has implemented this RC concept into Boeing service bulletins. In an effort to further improve the quality of ADs and AD-related Boeing Proposed AD Requirements This proposed AD would require accomplishment of the actions identified in the Boeing Alert Requirements Bulletin 737–53A1371 RB, dated January 19, 2018, described previously, except for any differences identified as exceptions in the regulatory text of this proposed AD. service information, a joint process improvement initiative was worked between the FAA and Boeing. The initiative resulted in the development of a new process in which the service information more clearly identifies the actions needed to address the unsafe condition in the ‘‘Accomplishment Instructions.’’ The new process results in a Boeing Requirements Bulletin, which contains only the actions needed to address the unsafe condition (i.e., only the RC actions). Costs of Compliance We estimate that this proposed AD affects 63 airplanes of U.S. registry. We estimate the following costs to comply with this proposed AD: ESTIMATED COSTS FOR REQUIRED ACTIONS Action Labor cost Repetitive inspections .. Up to 14 work-hours × $85 per hour = $1,190 per inspection cycle. Cost per product Parts cost $0 Up to $1,190 per inspection cycle. Director has delegated the authority to issue ADs applicable to transport category airplanes to the Director of the System Oversight Division. Authority for This Rulemaking sradovich on DSK3GMQ082PROD with PROPOSALS We have received no definitive data that would enable us to provide cost estimates for the on-condition actions specified in this proposed AD. Regulatory Findings 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. We are 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. This proposed AD is issued in accordance with authority delegated by the Executive Director, Aircraft Certification Service, as authorized by FAA Order 8000.51C. In accordance with that order, issuance of ADs is normally a function of the Compliance and Airworthiness Division, but during this transition period, the Executive We 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) Is not a ‘‘significant rule’’ under the DOT Regulatory Policies and Procedures (44 FR 11034, February 26, 1979), (3) Will not affect intrastate aviation in Alaska, and (4) Will not have a significant economic impact, positive or negative, on a substantial number of small entities under the criteria of the Regulatory Flexibility Act. VerDate Sep<11>2014 17:56 May 10, 2018 Jkt 244001 Cost on U.S. operators Up to $74,790 per inspection cycle. 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 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 (AD): ■ The Boeing Company: Docket No. FAA– 2018–0392; Product Identifier 2018– NM–044–AD. (a) Comments Due Date We must receive comments by June 25, 2018. (b) Affected ADs None. (c) Applicability This AD applies to all The Boeing Company Model 737–100, –200, –200C, –300, –400, and –500 series airplanes, certificated in any category. List of Subjects in 14 CFR Part 39 (d) Subject Air Transport Association (ATA) of America Code 53, Fuselage. Air transportation, Aircraft, Aviation safety, Incorporation by reference, Safety. (e) Unsafe Condition This AD was prompted by a report indicating that cracks were found on the PO 00000 Frm 00007 Fmt 4702 Sfmt 4702 E:\FR\FM\11MYP1.SGM 11MYP1 21948 Federal Register / Vol. 83, No. 92 / Friday, May 11, 2018 / Proposed Rules fuselage frame webs at stations forward and aft of the overwing emergency exits between stringers S–7 and S–8. We are issuing this AD to address fuselage frame web cracking, which may lead to subsequent failure of the surrounding structure, and ultimately result in rapid decompression and loss of structural integrity of the airplane. (f) Compliance Comply with this AD within the compliance times specified, unless already done. (g) Required Actions for Group 1 Airplanes For airplanes identified as Group 1 in Boeing Alert Requirements Bulletin 737– 53A1371 RB, dated January 19, 2018: Within 120 days after the effective date of this AD, inspect the fuselage frame webs at station (STA) 616 and STA 639 between stringers S– 7 and S–8 and do all applicable repairs, using a method approved in accordance with the procedures specified in paragraph (j) of this AD. (h) Required Actions for Groups 2 Through 4 Airplanes Except for airplanes identified in paragraph (g) of this AD and except as required by paragraph (i) of this AD: At the applicable times specified in the ‘‘Compliance’’ paragraph of Boeing Alert Requirements Bulletin 737–53A1371 RB, dated January 19, 2018, do all applicable actions identified in, and in accordance with, the Accomplishment Instructions of Boeing Alert Requirements Bulletin 737–53A1371 RB, dated January 19, 2018. Note 1 to paragraph (h) of this AD: Guidance for accomplishing the actions required by this AD can be found in Boeing Alert Service Bulletin 737–53A1371, dated January 19, 2018, which is referred to in Boeing Alert Requirements Bulletin 737– 53A1371 RB, dated January 19, 2018. sradovich on DSK3GMQ082PROD with PROPOSALS (i) Exceptions to Service Information Specifications (1) For purposes of determining compliance with the requirements of this AD: Where Boeing Alert Requirements Service Bulletin 737–53A1371 RB, dated January 19, 2018, uses the phrase ‘‘the original issue date of Requirements Bulletin 737–53A1371 RB,’’ this AD requires using ‘‘the effective date of this AD.’’ (2) Where Boeing Alert Requirements Bulletin 737–53A1371 RB, dated January 19, 2018, specifies contacting Boeing, this AD requires repair using a method approved in accordance with the procedures specified in paragraph (j) of this AD. (j) Alternative Methods of Compliance (AMOCs) (1) The Manager, Los Angeles 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 local Flight Standards District 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 (k)(1) of VerDate Sep<11>2014 17:56 May 10, 2018 Jkt 244001 this AD. Information may be emailed to: 9ANM-LAACO-AMOC-Requests@faa.gov. (2) Before using any approved AMOC, notify your appropriate principal inspector, or lacking a principal inspector, the manager of the local flight standards district office/ certificate holding district 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 Commercial Airplanes Organization Designation Authorization (ODA) that has been authorized by the Manager, Los Angeles ACO Branch, 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. missing attachment bolts for the main landing gear (MLG) center door assemblies. This proposed AD would require repetitive detailed inspections of the forward and aft MLG center door assembly attachments for loose, missing, damaged, or bottomed out attachment bolts; any wear to the retention clip assemblies as applicable; and applicable on-condition actions. This proposed AD would also provide an optional terminating action for the repetitive inspections. Since this is a rotable parts issue, the applicability of this AD has been expanded beyond the airplanes listed in the related service bulletin to include all airplanes on which the MLG center door assemblies may be installed. (k) Related Information We are proposing this AD to address the (1) For more information about this AD, unsafe condition on these products. contact David Truong, Aerospace Engineer, DATES: We must receive comments on Airframe Section, FAA, Los Angeles ACO this proposed AD by June 25, 2018. Branch, 3960 Paramount Boulevard, Lakewood, CA 90712–4137; phone: 562–627– ADDRESSES: You may send comments, 5224; fax: 562–627–5210; email: using the procedures found in 14 CFR david.truong@faa.gov. 11.43 and 11.45, by any of the following (2) For service information identified in methods: this AD, contact Boeing Commercial • Federal eRulemaking Portal: Go to Airplanes, Attention: Contractual & Data https://www.regulations.gov. Follow the Services (C&DS), 2600 Westminster Blvd., instructions for submitting comments. MC 110–SK57, Seal Beach, CA 90740–5600; • Fax: 202–493–2251. telephone 562–797–1717; internet https:// • Mail: U.S. Department of www.myboeingfleet.com. You may view this referenced service information at the FAA, Transportation, Docket Operations, M– Transport Standards Branch, 2200 South 30, West Building Ground Floor, Room 216th St., Des Moines, WA. For information W12–140, 1200 New Jersey Avenue SE, on the availability of this material at the Washington, DC 20590. FAA, call 206–231–3195. • Hand Delivery: Deliver to Mail Issued in Des Moines, Washington, on address above between 9 a.m. and 5 April 27, 2018. p.m., Monday through Friday, except Michael Kaszycki, Federal holidays. Acting Director, System Oversight Division, For service information identified in Aircraft Certification Service. this NPRM, contact Boeing Commercial [FR Doc. 2018–09977 Filed 5–10–18; 8:45 am] Airplanes, Attention: Contractual & Data Services (C&DS), 2600 Westminster BILLING CODE 4910–13–P Blvd., MC 110–SK57, Seal Beach, CA 90740–5600; telephone 562–797–1717; DEPARTMENT OF TRANSPORTATION internet https:// www.myboeingfleet.com. You may view Federal Aviation Administration this referenced service information at the FAA, Transport Standards Branch, 14 CFR Part 39 2200 South 216th St., Des Moines, WA. For information on the availability of [Docket No. FAA–2018–0393; Product this material at the FAA, call 206–231– Identifier 2018–NM–010–AD] 3195. It is also available on the internet RIN 2120–AA64 at https://www.regulations.gov by searching for and locating Docket No. Airworthiness Directives; The Boeing FAA–2018–0393. Company Airplanes Examining the AD Docket AGENCY: Federal Aviation You may examine the AD docket on Administration (FAA), DOT. the internet at https:// ACTION: Notice of proposed rulemaking www.regulations.gov by searching for (NPRM). and locating Docket No. FAA–2018– 0393; or in person at the Docket SUMMARY: We propose to adopt a new Management Facility between 9 a.m. airworthiness directive (AD) for all The Boeing Company Model 737–600, –700, and 5 p.m., Monday through Friday, except Federal holidays. The AD docket –700C, –800, –900, and –900ER series contains this NPRM, the regulatory airplanes. This proposed AD was evaluation, any comments received, and prompted by reports of loose, worn, or PO 00000 Frm 00008 Fmt 4702 Sfmt 4702 E:\FR\FM\11MYP1.SGM 11MYP1

Agencies

[Federal Register Volume 83, Number 92 (Friday, May 11, 2018)]
[Proposed Rules]
[Pages 21946-21948]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2018-09977]


=======================================================================
-----------------------------------------------------------------------

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2018-0392; Product Identifier 2018-NM-044-AD]
RIN 2120-AA64


Airworthiness Directives; The Boeing Company Airplanes

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Notice of proposed rulemaking (NPRM).

-----------------------------------------------------------------------

SUMMARY: We propose to adopt a new airworthiness directive (AD) for all 
The Boeing Company Model 737-100, -200, -200C, -300, -400, and -500 
series airplanes. This proposed AD was prompted by a report indicating 
that cracks were found on the fuselage frame webs at stations forward 
and aft of the overwing emergency exits between stringers S-7 and S-8. 
This proposed AD would require repetitive high frequency eddy current 
(HFEC) inspections for cracking of the fuselage frame webs at certain 
stations between stringers S-7 and S-8 and applicable on-condition 
actions. We are proposing this AD to address the unsafe condition on 
these products.

DATES: We must receive comments on this proposed AD by June 25, 2018.

ADDRESSES: You may send comments, using the procedures found in 14 CFR 
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, Transport 
Standards 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 on the internet at https://www.regulations.gov by 
searching for and locating Docket No. FAA-2018-0392.

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. FAA-2018-
0392; 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, the regulatory evaluation, any comments received, and other 
information. The street address for Docket Operations (phone: 800-647-
5527) is in the ADDRESSES section. Comments will be available in the AD 
docket shortly after receipt.

FOR FURTHER INFORMATION CONTACT: David Truong, Aerospace Engineer, 
Airframe Section, FAA, Los Angeles ACO Branch, 3960 Paramount 
Boulevard, Lakewood, CA 90712-4137; phone: 562-627-5224; fax: 562-627-
5210; email: [email protected].

SUPPLEMENTARY INFORMATION:

Comments Invited

    We invite you to send any written relevant data, views, or 
arguments about this proposal. Send your comments to an address listed 
under the ADDRESSES section. Include ``Docket No. FAA-2018-0392; 
Product Identifier 2018-NM-044-AD'' at the beginning of your comments. 
We specifically invite comments on the overall regulatory, economic, 
environmental, and energy aspects of this NPRM. We will consider all 
comments received by the closing date and may amend this NPRM because 
of those comments.
    We will post all comments we receive, without change, to https://www.regulations.gov, including any personal information you provide. We 
will also post a report summarizing each substantive verbal contact we 
receive about this proposed AD.

Discussion

    We have received a report indicating that cracks were found on the 
fuselage frame webs at stations forward and aft of the overwing 
emergency exits between stringers S-7 and S-8. Cracks were found at 
multiple stations and ranged in length from 2.4 inches to 2.55 inches. 
The cracks started at the end fastener common to the uppermost shear 
tie above the emergency exit doors, where there is high load transfer 
due to high shear flows around the emergency exit doors. The cracks are 
the result of fatigue loading caused by cyclic pressurization of the 
fuselage. This condition, if not addressed, could result in fuselage 
frame web cracking, which may lead to subsequent failure of the 
surrounding structure, and ultimately result in rapid decompression and 
loss of structural integrity of the airplane.

Related Service Information Under 1 CFR Part 51

    We reviewed Boeing Alert Requirements Bulletin 737-53A1371 RB, 
dated January 19, 2018. The service information describes procedures 
for repetitive HFEC inspections for cracking of the fuselage frame webs 
at certain stations between stringers S-7 and S-8 and applicable on-
condition actions. The on-condition action is repair. This service 
information is reasonably available because the interested parties

[[Page 21947]]

have access to it through their normal course of business or by the 
means identified in the ADDRESSES section.

FAA's Determination

    We are proposing this AD because we 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.

Proposed AD Requirements

    This proposed AD would require accomplishment of the actions 
identified in the Boeing Alert Requirements Bulletin 737-53A1371 RB, 
dated January 19, 2018, described previously, 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-2018-0392.

Explanation of Requirements Bulletin

    The FAA worked in conjunction with industry, under the 
Airworthiness Directives Implementation Aviation Rulemaking Committee 
(AD ARC), to enhance the AD system. One enhancement is a process for 
annotating which steps in the service information are ``required for 
compliance'' (RC) with an AD. Boeing has implemented this RC concept 
into Boeing service bulletins.
    In an effort to further improve the quality of ADs and AD-related 
Boeing service information, a joint process improvement initiative was 
worked between the FAA and Boeing. The initiative resulted in the 
development of a new process in which the service information more 
clearly identifies the actions needed to address the unsafe condition 
in the ``Accomplishment Instructions.'' The new process results in a 
Boeing Requirements Bulletin, which contains only the actions needed to 
address the unsafe condition (i.e., only the RC actions).

Costs of Compliance

    We estimate that this proposed AD affects 63 airplanes of U.S. 
registry. We estimate the following costs to comply with this proposed 
AD:

                                      Estimated Costs for Required Actions
----------------------------------------------------------------------------------------------------------------
                                                                                                Cost on  U.S.
              Action                    Labor cost        Parts cost     Cost per  product        operators
----------------------------------------------------------------------------------------------------------------
Repetitive inspections...........  Up to 14 work-hours              $0  Up to $1,190 per     Up to $74,790 per
                                    x $85 per hour =                     inspection cycle.    inspection cycle.
                                    $1,190 per
                                    inspection cycle.
----------------------------------------------------------------------------------------------------------------

    We have received no definitive data that would enable us to provide 
cost estimates for the on-condition actions specified in this proposed 
AD.

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.
    We are 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.
    This proposed AD is issued in accordance with authority delegated 
by the Executive Director, Aircraft Certification Service, as 
authorized by FAA Order 8000.51C. In accordance with that order, 
issuance of ADs is normally a function of the Compliance and 
Airworthiness Division, but during this transition period, the 
Executive Director has delegated the authority to issue ADs applicable 
to transport category airplanes to the Director of the System Oversight 
Division.

Regulatory Findings

    We 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) Is not a ``significant rule'' under the DOT Regulatory Policies 
and Procedures (44 FR 11034, February 26, 1979),
    (3) Will not affect intrastate aviation in Alaska, and
    (4) Will 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 (AD):

The Boeing Company: Docket No. FAA-2018-0392; Product Identifier 
2018-NM-044-AD.

(a) Comments Due Date

    We must receive comments by June 25, 2018.

(b) Affected ADs

    None.

(c) Applicability

    This AD applies to all The Boeing Company Model 737-100, -200, -
200C, -300, -400, and -500 series airplanes, certificated in any 
category.

(d) Subject

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

(e) Unsafe Condition

    This AD was prompted by a report indicating that cracks were 
found on the

[[Page 21948]]

fuselage frame webs at stations forward and aft of the overwing 
emergency exits between stringers S-7 and S-8. We are issuing this 
AD to address fuselage frame web cracking, which may lead to 
subsequent failure of the surrounding structure, and ultimately 
result in rapid decompression and loss of structural integrity of 
the airplane.

(f) Compliance

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

(g) Required Actions for Group 1 Airplanes

    For airplanes identified as Group 1 in Boeing Alert Requirements 
Bulletin 737-53A1371 RB, dated January 19, 2018: Within 120 days 
after the effective date of this AD, inspect the fuselage frame webs 
at station (STA) 616 and STA 639 between stringers S-7 and S-8 and 
do all applicable repairs, using a method approved in accordance 
with the procedures specified in paragraph (j) of this AD.

(h) Required Actions for Groups 2 Through 4 Airplanes

    Except for airplanes identified in paragraph (g) of this AD and 
except as required by paragraph (i) of this AD: At the applicable 
times specified in the ``Compliance'' paragraph of Boeing Alert 
Requirements Bulletin 737-53A1371 RB, dated January 19, 2018, do all 
applicable actions identified in, and in accordance with, the 
Accomplishment Instructions of Boeing Alert Requirements Bulletin 
737-53A1371 RB, dated January 19, 2018.

    Note 1 to paragraph (h) of this AD:  Guidance for accomplishing 
the actions required by this AD can be found in Boeing Alert Service 
Bulletin 737-53A1371, dated January 19, 2018, which is referred to 
in Boeing Alert Requirements Bulletin 737-53A1371 RB, dated January 
19, 2018.

(i) Exceptions to Service Information Specifications

    (1) For purposes of determining compliance with the requirements 
of this AD: Where Boeing Alert Requirements Service Bulletin 737-
53A1371 RB, dated January 19, 2018, uses the phrase ``the original 
issue date of Requirements Bulletin 737-53A1371 RB,'' this AD 
requires using ``the effective date of this AD.''
    (2) Where Boeing Alert Requirements Bulletin 737-53A1371 RB, 
dated January 19, 2018, specifies contacting Boeing, this AD 
requires repair using a method approved in accordance with the 
procedures specified in paragraph (j) of this AD.

(j) Alternative Methods of Compliance (AMOCs)

    (1) The Manager, Los Angeles 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 local Flight Standards 
District 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 (k)(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 local flight standards district office/certificate holding 
district 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 Commercial Airplanes Organization 
Designation Authorization (ODA) that has been authorized by the 
Manager, Los Angeles ACO Branch, 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.

(k) Related Information

    (1) For more information about this AD, contact David Truong, 
Aerospace Engineer, Airframe Section, FAA, Los Angeles ACO Branch, 
3960 Paramount Boulevard, Lakewood, CA 90712-4137; phone: 562-627-
5224; fax: 562-627-5210; 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, Transport Standards Branch, 2200 South 216th 
St., Des Moines, WA. For information on the availability of this 
material at the FAA, call 206-231-3195.

    Issued in Des Moines, Washington, on April 27, 2018.
Michael Kaszycki,
Acting Director, System Oversight Division, Aircraft Certification 
Service.
[FR Doc. 2018-09977 Filed 5-10-18; 8:45 am]
 BILLING CODE 4910-13-P
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