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2021-18-17 THE BOEING COMPANY:
Amendment 39-21718; Docket No. FAA-2020-0103; Product Identifier 2019-NM-149-AD.

(a) EFFECTIVE DATE

    This airworthiness directive (AD) is effective December 20, 2021.

(b) AFFECTED ADS

    This  AD  replaces AD  2012-21-08,  Amendment 39-17224  (77  FR 64711,
    October 23, 2012) (AD 2012-21-08).

(c) APPLICABILITY

    This AD applies to all The Boeing Company Model 737-600, -700,  -700C,
    -800, -900, and -900ER series airplanes, certificated in any category.

(d) SUBJECT

    Air Transport Association (ATA) of America Code 22, Auto flight.

(e) UNSAFE CONDITION

    This AD was prompted by  reports that during autopilot coupled  instru
    -ment landing system (ILS)  approaches,  the airplane did not  capture
    or  track the  glideslope correctly.  The FAA  is issuing  this AD  to
    address  this condition,  which could  allow the  airplane to  descend
    below  the  glideslope  beam  and  result  in  controlled  flight into
    terrain.

(f) COMPLIANCE

    Comply with this AD within the compliance times specified,  unless al-
    ready done.

(g) RETAINED PART NUMBERS INSPECTION WITH REVISED PARAGRAPH REFERENCES AND
    REMOVED TERMINATING ACTION

    This paragraph restates the requirements  of paragraph (h) of AD  2012
    -21-08,  with  revised paragraph  references  and removed  terminating
    action.  For The Boeing Company Model 737-600, -700, -700C, -800,  and
    -900 series  airplanes, certificated  in any  category; delivered with
    the Rockwell Collins Enhanced  Digital Flight Control System  (EDFCS),
    as  identified  in  the  variable  number  table  in  Section  1.A.1.,
    Effectivity,  of  Boeing  Alert  Service  Bulletin 737-22A1211,  dated
    April 13, 2010,  and  not  defined  by  the "Group  1" description  in
    Section  1.A. of  Boeing Alert  Service Bulletin  737- 22A1211,  dated
    April 13, 2010: Within 3 months after November 27, 2012 (the effective
    date of AD  2012-21-08), inspect to  determine the part  number of the
    operational program  software (OPS)  of the  flight control  computers
    (FCCs), in accordance with  the Accomplishment Instructions of  Boeing
    Alert Service Bulletin 737-22A1211, dated April 13, 2010, and  install
    the software  as required  by paragraph  (g)(1) of  this AD, or verify
    that the  software is  installed as  specified by  paragraph (g)(2) of
    this AD, as applicable.

(1) For any OPS having a part number  identified in table 1  of the Accom-
    plishment Instructions  of  Boeing Alert Service Bulletin 737-22A1211,
    dated April 13, 2010:  Before further flight, do the actions specified
    in paragraph (g)(1)(i) or (ii), as applicable.

(i) Install software  identified in table 2 of the Accomplishment Instruc-
    tions of  Boeing Alert Service Bulletin 737-22A1211,  dated  April 13,
    2010,  in  accordance  with  the Accomplishment Instructions of Boeing
    Alert Service Bulletin 737-22A1211, dated April 13, 2010.

(ii) Install software identified in table 2 of the Accomplishment Instruc-
     tions  of  Boeing Alert Service Bulletin 737-22A1224,  dated  May 18,
     2012,  in  accordance  with the Accomplishment Instructions of Boeing
     Alert Service Bulletin 737-22A1211, dated April 13, 2010.

(2) For any OPS having a part number identified  in table 2  of the Accom-
    plishment Instructions  of  Boeing Alert Service Bulletin 737-22A1211,
    dated April 13, 2010; or in table 2 of the Accomplishment Instructions
    of Boeing Alert Service Bulletin 737-22A1224,  dated  May 18, 2012: No
    further action is required by this paragraph.

(h) RETAINED OPTIONAL SOFTWARE INSTALLATION, WITH REVISED PARAGRAPH REFER-
    ENCES

    This paragraph restates the requirements of paragraph (i)  of AD 2012-
    21-08, with revised paragraph references. Installing a version of  the
    FCC OPS approved after  May 18, 2012 (the  issue date of Boeing  Alert
    Service Bulletin 737-22A1224) terminates the requirements of paragraph
    (g) of this AD, provided  that the conditions specified in  paragraphs
    (h)(1) and (2) of this AD are met.

(1) The version of the FCC OPS  must be approved  by the Manager,  Seattle
    ACO Branch, FAA; the Manager, Boeing Aviation Safety Oversight  Office
    (BASOO),  FAA;   or  The   Boeing  Company   Organization  Designation
    Authorization (ODA). If approved by the ODA, the approval must include
    the ODA-authorized signature.

(2) The installation must be done in accordance  with a method approved by
    the Manager, Seattle ACO, FAA; the Manager, BASOO, FAA; or The  Boeing
    Company ODA.  If approved  by the  ODA, the  approval must include the
    ODA-authorized signature.

(i) NEW REQUIREMENT OF THIS AD: INSPECTION

    For all airplanes: Within 12  months after the effective date  of this
    AD, inspect to determine the  FCC OPS vendor and version  installed on
    FCC  A  and  FCC  B.  A  review  of  airplane  maintenance  records is
    acceptable  in lieu  of  this  inspection if  the FCC  OPS vendor  and
    version can be conclusively determined from that review.

(j) NEW REQUIREMENT OF THIS AD: SOFTWARE INSTALLATION

(1) For airplanes equipped with Rockwell Collins FCCs with FCC OPS version
    P8.0 or P9.0  software: Within 12  months after the  effective date of
    this AD, do  all applicable actions  identified in, and  in accordance
    with,  the Accomplishment  Instructions of  Boeing Alert  Requirements
    Bulletin 737-22A1322 RB, Revision 1, dated January 28, 2021.

Note 1 to paragraph (j)(1): Guidance  for accomplishing  the  actions  re-
quired by paragraph (j)(1) of this AD can be found in Boeing Alert Service
Bulletin 737-22A1322 Revision 1, dated January 28, 2021, which is referred
to in Boeing Alert Requirements Bulletin 737-22A1322 RB, Revision 1, dated
January 28, 2021.

(2) For airplanes  not equipped  with  Rockwell Collins FCCs  with FCC OPS
    version P8.0 or P9.0 software:  No further action is required  by this
    paragraph.

(k) NEW REQUIREMENT OF THIS AD: PARTS INSTALLATION PROHIBITION

    For all airplanes:  As of the effective date of this AD, no person may
    install Rockwell Collins  FCC OPS software  version  P1.1, P2.0, P3.0,
    P8.0, or P9.0, on any airplane.

(l) CREDIT FOR PREVIOUS ACTIONS

    This paragraph provides credit for the actions  specified in paragraph
    (j) of this AD,  if those actions were performed  before the effective
    date of this AD  using  Boeing Alert Requirements Bulletin 737-22A1322
    RB, dated November 21, 2018.

(m) 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  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 (n)(1) 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 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  Company 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.

(n) RELATED INFORMATION

(1) For more information about this AD,  contact  Michael J. Tucker, Aero-
    space Engineer, Systems and Equipment Section, FAA, Seattle ACO Branch
    2200 South 216th St, Des Moines, WA 98198; phone and fax: 206-231-3974
    email: michael.j.tucker@faa.gov.

(2) Service information  identified in this AD that is not incorporated by
    reference is available at the addresses specified in paragraphs (o)(5)
    and (6) of this AD.

(o) 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 this AD specifies otherwise.

(3) The following service information was approved for IBR on December 20,
    2021.

(i) Boeing Alert Requirements Bulletin 737-22A1322 RB,  Revision 1,  dated
    January 28, 2021.

(ii) [Reserved]

(4) The following service information was approved for IBR on November 27,
    2012 (77 FR 64711, October 23, 2012).

(i) Boeing Alert Service Bulletin 737-22A1211, dated April 13, 2010.

(ii) Boeing Alert Service Bulletin 737-22A1224, dated May 18, 2012.

(5) 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.

(6) 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.

(7) 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,  email fr.
    inspection@nara.gov,   or   go  to:  https://www.archives.gov/federal-
    register/cfr/ibr-locations.html.

Issued on August 30, 2021. Gaetano A. Sciortino, Deputy Director for Stra-
tegic Initiatives, Compliance & Airworthiness Division,  Aircraft Certifi-
cation Service.

FOR FURTHER INFORMATION CONTACT:  Michael J. Tucker,  Aerospace  Engineer,
Systems and Equipment Section,  FAA,  Seattle ACO Branch, 2200 South 216th
St., Des Moines, WA 98198;  phone and fax: 206-231-3974; email: michael.j.
tucker@faa.gov.
PREAMBLE 

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2020-0103; Product Identifier 2019-NM-149-AD; Amendment
39-21718; AD 2021-18-17]
RIN 2120-AA64

Airworthiness Directives; The Boeing Company Airplanes

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final rule.

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

SUMMARY: The FAA is superseding Airworthiness Directive (AD) 2012-21-
08, which applied to certain The Boeing Company Model 737-600, -700, -
700C, -800, and -900 series airplanes. AD 2012-21-08 required
inspecting for part numbers of the operational program software (OPS)
of the flight control computers (FCCs) and installing and testing an
updated version of the FCC OPS. This AD was prompted by reports that
during autopilot coupled instrument landing system (ILS) approaches,
the airplane did not capture or track the glideslope correctly. This AD
retains the requirement to inspect for part numbers of the OPS of the
FCCs, and adds a new requirement to update the version of the FCC OPS
if necessary. This AD also expands the applicability to include The
Boeing Company Model 737-900ER series airplanes. The FAA is issuing
this AD to address the unsafe condition on these products.

DATES: This AD is effective December 20, 2021.
The Director of the Federal Register approved the incorporation by
reference of a certain publication listed in this AD as of December 20,
2021.
The Director of the Federal Register approved the incorporation by
reference of certain other publications listed in this AD as of
November 27, 2012 (77 FR 64711, October 23, 2012).

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-2020-0103.

Examining the AD Docket


You may examine the AD docket at https://www.regulations.gov by
searching for and locating Docket No. FAA-2020-0103; 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: Michael J. Tucker, Aerospace Engineer,
Systems and Equipment Section, FAA, Seattle ACO Branch, 2200 South
216th St., Des Moines, WA 98198; phone and fax: 206-231-3974; email:
michael.j.tucker@faa.gov.

SUPPLEMENTARY INFORMATION:

Background

The FAA issued a notice of proposed rulemaking (NPRM) to amend 14
CFR part 39 to supersede AD 2012-21-08, Amendment 39-17224 (77 FR
64711, October 23, 2012) (AD 2012-21-08). AD 2012-21-08 applied to
certain The Boeing Company Model 737-600, -700, -700C, -800, and -900
series airplanes. The NPRM published in the Federal Register on
February 27, 2020 (85 FR 11319). The NPRM was prompted by reports that
during autopilot coupled ILS approaches, the airplane did not capture
or track the glideslope correctly. In the NPRM, the FAA proposed to
continue to require inspecting for part numbers of the OPS of the FCCs,
and to add a new requirement to update the version of the FCC OPS if
necessary. The NPRM also proposed to expand the applicability to
include The Boeing Company Model 737-900ER series airplanes. The FAA is
issuing this AD to address the glideslope capture problem, which could
allow the airplane to descend below the glideslope beam and result in
controlled flight into terrain on airplanes that do not have the
upgraded FCC OPS installed.

Discussion of Final Airworthiness Directive

Comments

The FAA received comments from two commenters, including Air Line
Pilots Association, International (ALPA) and United Airlines, who
supported the NPRM without change.
The FAA received additional comments from three commenters,
including Boeing, Alaska Airlines, and Aviation Partners Boeing. The
following presents the comments received on the NPRM and the FAA's
response to each comment.

Effect of Winglets on Accomplishment of the Proposed Actions

Aviation Partners Boeing stated that the installation of winglets
per Supplemental Type Certificate (STC) ST00830SE does not affect the
actions specified in the NPRM.
The FAA agrees with the commenter that 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. The FAA has not
changed this AD in this regard.

Request To Require Removal of Certain Software Versions

Alaska Airlines requested that the proposed AD be revised to
require removing a particular version of the software or earlier
versions, rather than require installing a particular version or later
versions. The commenter asserted that Rockwell Collins software
versions 9.0 and earlier are the cause of the unsafe condition.
The FAA does not agree with the suggested change to the
requirements of this AD. Such a change would require operators who have
certain acceptable earlier software to install different software
unnecessarily. Paragraph (k) of
this AD specifically prohibits installing Rockwell Collins FCC OPS
software versions P1.1, P2.0, P3.0, P8.0, and P9.0. The unsafe
conditions identified in AD 2012-21-08 and in this AD only exist with
Rockwell Collins software versions P1.1, P2.0, P3.0, P8.0, and P9.0.
Paragraph (k) of the proposed AD had inadvertently referred to
software version ``P1.0'' as one of the affected versions that was
prohibited for installation. Boeing Alert Service Bulletin 737-22A1211
correctly identifies this affected software version as ``P1.1.'' The
FAA has corrected this reference as version ``P1.1'' in paragraph (k)
of this AD.

Request To Require Latest Service Information

Boeing requested that the FAA revise the NPRM to refer to Boeing
Alert Requirements Bulletin 737-22A1322 RB, Revision 1, dated January
28, 2021, rather than Boeing Alert Requirements Bulletin 737-22A1322
RB, dated November 21, 2018. Boeing noted that Boeing Alert
Requirements Bulletin 737-22A1322 RB, Revision 1, dated January 28,
2021, is the most current revision and has the correct FAA-only
approval statement for The Boeing Company Model 737-700C airplanes.
The FAA agrees with the request. The changes in Revision 1 are non-
substantive and do not affect the requirements as proposed in the NPRM
for this AD. Therefore, the FAA has revised this final rule to refer to
Boeing Alert Requirements Bulletin 737-22A1322 RB, Revision 1, dated
January 28, 2021, as the appropriate source of service information for
the newly required software installation. The FAA also has added
paragraph (l) of this AD to provide credit for certain actions that
were performed before the effective date of this AD using Boeing Alert
Requirements Bulletin 737-22A1322 RB, dated November 21, 2018.
Subsequent paragraphs have been re-identified 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 737-22A1322 RB,
Revision 1, dated January 28, 2021. The service information describes
procedures for installing and testing an updated version of the FCC
OPS.
This AD also requires Boeing Alert Service Bulletin 737-22A1211,
dated April 13, 2010; and Boeing Alert Service Bulletin 737-22A1224,
dated May 18, 2012; which the Director of the Federal Register approved
for incorporation by reference as of November 27, 2012 (77 FR 64711,
October 23, 2012).
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 520 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
Inspection and installation (retained actions from AD 2012-21-08) 3 work-hours x $85 per hour = $255 per inspection
$0
$255
$52,785 (based on 207 affected airplanes)
Part number inspection (new action) 1 work-hour x $85 per hour = $85
0
85
$44,200

The FAA estimates the following costs to do any necessary on-
condition actions that would be required. The FAA 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
Install upgraded software 1 work-hour x $85 per hour = $85
$0
$85

According to the manufacturer, all of the costs of this AD may be
covered under warranty, thereby reducing the cost impact on affected
operators. The FAA does not control warranty coverage for affected
operators. As a result, the FAA has included all costs in this cost
estimate.

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:

a. Removing Airworthiness Directive (AD) 2012-21-08, Amendment 39-17224
(77 FR 64711, October 23, 2012); and

b. Adding the following new AD: