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2022-11-13 THE BOEING COMPANY: Amendment 39-22063; Docket No. FAA-2021-0788; Project Identifier AD-2021-00489-T.
(a) EFFECTIVE DATE

    This airworthiness directive (AD) is effective August 3, 2022.

(b) AFFECTED ADS

    None.

(c) APPLICABILITY

(1) 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.

(2) Installation of Supplemental Type Certificate (STC) ST00830SE does not
    affect the  ability to  accomplish the  actions required  by this  AD.
    Therefore,  for  airplanes  on which  STC  ST00830SE  is installed,  a
    "change in product" alternative  method of compliance (AMOC)  approval
    request is  not necessary  to comply  with the  requirements of 14 CFR
    39.17.

(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 al-
    ready 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 Require-
    ments  Bulletin  737-53A1384  RB,  dated  September 10, 2020,  do  all
    applicable actions identified in,  and in accordance with,  the Accom-
    plishment 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 Compliance Time column  and  the notes  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 Septem-
    ber 10, 2020,  specifies contacting Boeing  for 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 appro-
    priate. If sending information directly to the manager of the certifi-
    cation office,  send it to the attention  of the person  identified in
    paragraph (j) of this AD. Information may be emailed to: 9-ANM-Seattle
    -ACO-AMOC-Requests@faa.gov.

(2) Before using any approved AMOC,  notify your appropriate principal in-
    spector, or lacking a principal inspector,  the manager of the respon-
    sible 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

    For more information about this AD,  contact Bill Ashforth,  Aerospace
    Engineer, Airframe Section, FAA,  Seattle ACO Branch, 2200 South 216th
    St., Des Moines, WA 98198;  phone and fax: 206-231-3520;  email: bill.
    ashforth@faa.gov.

(k) MATERIAL INCORPORATED BY REFERENCE

(1) The Director of the Federal Register  approved  the  incorporation  by
    reference (IBR)  of the service information  listed  in this paragraph
    under 5 U.S.C. 552(a) and 1 CFR part 51.

(2) You must use this service information  as applicable to do the actions
    required by this AD, unless the AD specifies otherwise.

(i) Boeing Alert Requirements Bulletin 737-53A1384 RB, dated September 10,
    2020.

(ii) [Reserved]

(3) For service information identified in this AD,  contact Boeing Commer-
    cial 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.

(4) You may view this service information at the FAA,  Airworthiness Prod-
    ucts 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.

(5) You may view  this service information  that is incorporated by refer-
    ence at the National Archives and Records Administration  (NARA).  For
    information on the availability of this material at NARA fr.inspection
    @nara.gov, or go to: https://www.archives.gov/federal-register/cfr/ibr
    -locations.html.

Issued on May 25, 2022. Gaetano A Sciortino, Deputy Director for Strategic
Initiatives,  Compliance & Airworthiness Division,  Aircraft Certification
Service.

FOR FURTHER INFORMATION CONTACT: Bill Ashforth,  Aerospace Engineer,  Air-
frame Section, FAA, Seattle ACO Branch,  2200 South 216th St., Des Moines,
WA 98198; phone and fax: 206-231-3520; email: bill.ashforth@faa.gov.
PREAMBLE 

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2021-0788; Project Identifier AD-2021-00489-T;
Amendment 39-22063; AD 2022-11-13]
RIN 2120-AA64

Airworthiness Directives; The Boeing Company Airplanes

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final rule.

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

SUMMARY: The FAA is adopting a new airworthiness directive (AD) for
certain The Boeing Company Model 737-700, -800, and -900ER series
airplanes. This AD was prompted by reports of incorrectly installed
fuselage skin fasteners. This AD requires 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 issuing this AD to address the unsafe
condition on these products.

DATES: This AD is effective August 3, 2022.
The Director of the Federal Register approved the incorporation by
reference of a certain publication listed in this AD as of August 3,
2022.

ADDRESSES: For service information identified in this final rule,
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 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 final rule, any
comments received, and other information. The address for Docket
Operations is U.S. Department of Transportation, Docket Operations, M-
30, West Building Ground Floor, Room W12-140, 1200 New Jersey Avenue
SE, Washington, DC 20590.

FOR FURTHER INFORMATION CONTACT: Bill Ashforth, Aerospace Engineer,
Airframe Section, FAA, Seattle ACO Branch, 2200 South 216th St., Des
Moines, WA 98198; phone and fax: 206-231-3520; email:
bill.ashforth@faa.gov.

SUPPLEMENTARY INFORMATION:

Background

The FAA issued a notice of proposed rulemaking (NPRM) to amend 14
CFR part 39 by adding an AD that would apply to certain The Boeing
Company Model 737-700, -800, and -900ER series airplanes. The NPRM
published in the Federal Register on October 13, 2021 (86 FR 56840).
The NPRM was prompted by reports of incorrectly installed fuselage skin
fasteners found at the station (STA) 727 bulkhead. This condition was
the result of incorrect procedures used to install affected fasteners
during airplane production that occurred within a certain time period.
In the NPRM, the FAA proposed to require a detailed inspection of STA
727 body station bulkhead, between stringers S-22 and S-27, for any
incorrectly installed fastener common to fuselage skin, and applicable
on-condition actions. The FAA is issuing this AD to prevent continuous
operation of the airplane with undetected incorrectly installed
fasteners, which may generate fatigue cracking that could adversely
affect the structural integrity of the airplane.

Discussion of Final Airworthiness Directive

Comments

The FAA received comments from Boeing, United Airlines, Air Line
Pilots Association, International, and an individual commenter, who
supported the NPRM without change.
The FAA received additional comments from two commenters, including
Aviation Partners Boeing and Delta Air Lines (DAL). The following
presents the comments received on the NPRM and the FAA's response.

Effects of Winglets on Accomplishment of the Proposed Actions

Aviation Partners Boeing and DAL commented regarding the
installation of blended or split scimitar winglets per Supplemental
Type Certificate (STC) ST00830SE and the effect of that installation on
compliance with the proposed actions. DAL further requested a change to
paragraph (c) of the proposed AD to clarify that the installation of
STC ST00830SE does not affect the accomplishment of the manufacturer's
service instructions.
The FAA agrees to clarify that the installation of winglets per STC
ST00830SE does not affect the accomplishment of the manufacturer's
service instructions. Therefore, the installation of STC ST00830SE does
not affect the ability to accomplish the actions required by this AD.
Operators of airplanes with these winglets do not need to request a
``change in product'' alternative method of compliance (AMOC) approval
as specified in 14 CFR 39.17. The FAA has redesignated paragraph (c) of
the proposed AD as paragraph (c)(1) of this AD, and added paragraph
(c)(2) to this AD accordingly.

Conclusion

The FAA reviewed the relevant data, considered any comments
received, and determined that air safety requires adopting this AD as
proposed. Except for minor editorial changes, and any other changes
described previously, this AD is adopted as proposed in the NPRM. None
of the changes will increase the economic burden on any operator.

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.

Costs of Compliance

The FAA estimates that this AD affects 78 airplanes of U.S.
registry. The FAA estimates the following costs to comply with this AD:

Estimated Costs

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

The FAA estimates the following costs to do any necessary actions
that would be required based on the results of the 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 = $85 per inspection cycle $0 $1,785 per inspection cycle
HFEC and LFEC inspections 36 work-hours x $85 per hour = $3,060 per inspection cycle 0 3,060 per inspection cycle

The FAA has received no definitive data on which to base the work-
hour estimates for the repair and replacement specified in this AD. The
cost of any required fasteners, which are operator supplied, would be
minimal.
The FAA has included all known costs in its cost estimate.
According to the manufacturer, however, some or all of the costs of
this 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

This AD will not have federalism implications under Executive Order
13132. This AD will 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 that this AD:
(1) Is not a ``significant regulatory action'' under Executive
Order 12866,
(2) Will not affect intrastate aviation in Alaska, and
(3) 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 Amendment

Accordingly, under the authority delegated to me by the
Administrator, the FAA amends 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.

Sec. 39.13 [Amended]

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