Airworthiness Directives; The Boeing Company Airplanes

[Federal Register Volume 91, Number 132 (Monday, July 13, 2026)]
[Rules and Regulations]
[Pages 42849-42868]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2026-14090]


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

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2026-7218; Project Identifier AD-2026-00702-T; 
Amendment 39-23412; AD 2026-14-11]
RIN 2120-AA64


Airworthiness Directives; The Boeing Company Airplanes

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final rule; request for comments.

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

SUMMARY: The FAA is superseding Airworthiness Directive (AD) 2026-13-
05, which applied to all The Boeing Company Model 737-8, 737-9, and 
737-8200 airplanes. AD 2026-13-05 required revising the existing 
airplane flight manual (AFM) to provide the flightcrew with operating 
procedures (non-normal checklists) if a certain circuit breaker in the 
standby power control unit (SPCU) trips or certain environmental 
control system (ECS) circuit breakers downstream of the SPCU trip. 
Since the FAA issued AD 2026-13-05, a formatting error that omitted 
part of a certain appendix from AD 2026-13-05 was discovered. This AD 
retains the certain requirements of AD 2026-13-05 and requires revising 
the existing AFM to include the corrected appendix. The FAA is issuing 
this AD to address the unsafe condition on these products.

DATES: This AD is effective July 13, 2026.
    The FAA must receive comments on this AD by August 27, 2026.

ADDRESSES: You may send comments, using the procedures found in 14 CFR 
11.43 and 11.45, by any of the following methods:
    <bullet> Federal eRulemaking Portal: Go to regulations.gov. Follow 
the instructions for submitting comments.
    <bullet> Fax: 202-493-2251.
    <bullet> 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.
    <bullet> Hand Delivery: Deliver to Mail address above between 9 
a.m. and 5 p.m., Monday through Friday, except Federal holidays.
    AD Docket: You may examine the AD docket at regulations.gov by 
searching for and locating Docket No. FAA-2026-7218; or in person at 
Docket Operations between 9 a.m. and 5 p.m., Monday through Friday, 
except Federal holidays.

[[Page 42850]]

The AD docket contains this final rule, any comments received, and 
other information. The street address for Docket Operations is listed 
above.

FOR FURTHER INFORMATION CONTACT: Derrick Herrera, Aviation Safety 
Engineer, FAA, 2200 South 216th St., Des Moines, WA 98198; phone: 817-
222-5140; email: [email protected].

SUPPLEMENTARY INFORMATION: 

Comments Invited

    The FAA invites you to send any written data, views, or arguments 
about this final rule. Send your comments using a method listed under 
the ADDRESSES section. Include ``Docket No. FAA-2026-7218 and Project 
Identifier AD-2026-00702-T'' at the beginning of your comments. The 
most helpful comments reference a specific portion of the final rule, 
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 final rule 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 
regulations.gov, including any personal information you provide. The 
agency will also post a report summarizing each substantive verbal 
contact received about this final rule.

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 AD 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 AD, 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 AD. Submissions containing CBI should be sent to Derrick 
Herrera, Aviation Safety Engineer, FAA, 2200 South 216th St., Des 
Moines, WA 98198; phone: 817-222-5140; email: 
[email protected]. Any commentary that the FAA receives that is 
not specifically designated as CBI will be placed in the public docket 
for this rulemaking.

Background

    The FAA issued AD 2026-13-05, Amendment 39-23387 (91 FR 39854, July 
1, 2026) (AD 2026-13-05), for all The Boeing Company Model 737-8, 737-
9, and 737-8200 airplanes. AD 2026-13-05 required revising the existing 
AFM to provide the flightcrew with operating procedures (non-normal 
checklists) if a certain circuit breaker in the SPCU trips or certain 
ECS circuit breakers downstream of the SPCU trip. AD 2026-13-05 was 
prompted by reports of in-flight events of excessive cabin and flight 
deck temperatures that could not be controlled by the flightcrew using 
existing procedures. The FAA issued AD 2026-13-05 to address a tripped 
BAT BUS SECT 2 or ECS circuit breaker that could lead to an air 
conditioning system malfunction causing an uncontrollable, excessively 
high temperature in the cabin and flight deck. The unsafe condition, if 
not addressed, could lead to injury or incapacitation of flightcrew and 
passengers, which could result in the inability to maintain safe flight 
and landing.

Actions Since AD 2026-13-05 Was Issued

    Since the FAA issued AD 2026-13-05, it was discovered that there is 
a formatting error in appendix 5 of AD 2026-13-05 that omitted steps 1 
through 8 of the Cabin Temperature Hot PACK CONT VALVES RIGHT or LEFT 
Circuit Breaker Trips procedure.

FAA's Determination

    The FAA is issuing this AD because the agency has determined the 
unsafe condition described previously is likely to exist or develop in 
other products of the same type design.

AD Requirements

    This AD retains certain requirements of AD 2026-13-05. This AD also 
requires revising the existing AFM to include the corrected appendix 5 
to provide the flightcrew with the Cabin Temperature Hot PACK CONT 
VALVES RIGHT or LEFT Circuit Breaker Trips procedure.

Interim Action

    The FAA considers this AD to be an interim action. The manufacturer 
is currently developing a modification to address the unsafe condition 
identified in this AD. Once this modification is developed, FAA-
approved, and available, the FAA might consider additional rulemaking.

Justification for Immediate Adoption and Determination of the Effective 
Date

    Section 553(b) of the Administrative Procedure Act (APA) (5 U.S.C. 
551 et seq.) authorizes agencies to dispense with notice and comment 
procedures for rules when the agency, for ``good cause,'' finds that 
those procedures are ``impracticable, unnecessary, or contrary to the 
public interest.'' Under this section, an agency, upon finding good 
cause, may issue a final rule without providing notice and seeking 
comment prior to issuance. Further, section 553(d) of the APA 
authorizes agencies to make rules effective in less than thirty days, 
upon a finding of good cause.
    An unsafe condition exists that requires the immediate adoption of 
this AD without providing an opportunity for public comments prior to 
adoption. The FAA has found that the risk to the flying public 
justifies forgoing notice and comment prior to adoption of this rule 
because a tripped BAT BUS SECT 2 or ECS circuit breaker, and resulting 
effects on the cabin environment that cannot be controlled via normal 
procedures, could lead to injury or incapacitation of flightcrew and 
passengers, which could result in the inability to maintain safe flight 
and landing. Additionally, the compliance time in this AD is shorter 
than the time necessary for the public to comment and for publication 
of the final rule. Accordingly, notice and opportunity for prior public 
comment are impracticable and contrary to the public interest pursuant 
to 5 U.S.C. 553(b).
    In addition, the FAA finds that good cause exists pursuant to 5 
U.S.C. 553(d) for making this amendment effective in less than 30 days, 
for the same reasons the FAA found good cause to forgo notice and 
comment.

Regulatory Flexibility Act

    The requirements of the Regulatory Flexibility Act (RFA) do not 
apply when an agency finds good cause pursuant to 5 U.S.C. 553 to adopt 
a rule without prior notice and comment. Because the FAA has determined 
that it has good cause to adopt this rule without notice and comment, 
RFA analysis is not required.

Costs of Compliance

    The FAA estimates that this AD affects 825 airplanes of U.S. 
registry. The FAA estimates the following costs to comply with this AD:

[[Page 42851]]



                                                 Estimated Costs
----------------------------------------------------------------------------------------------------------------
                                                                                         Cost per   Cost on U.S.
                   Action                              Labor cost           Parts cost    product     operators
----------------------------------------------------------------------------------------------------------------
AFM Revision (retained actions from AD 2026- 1 work-hour x $85 per hour =           $0         $85       $70,125
 13-05).                                      $85.
AFM Revision (new AD action)...............  1 work-hour x $85 per hour =            0          85        70,125
                                              $85.
----------------------------------------------------------------------------------------------------------------

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, and
    (2) Will not affect intrastate aviation in Alaska.

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

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:
0
a. Removing Airworthiness Directive (AD) 2026-13-05, Amendment 39-23387 
(91 FR 39854, July 1, 2026); and
0
b. Adding the following new AD:

2026-14-11 The Boeing Company: Amendment 39-23412; Docket No. FAA-
2026-7218; Project Identifier AD-2026-00702-T.

(a) Effective Date

    This airworthiness directive (AD) is effective July 13, 2026.

(b) Affected ADs

    This AD replaces AD 2026-13-05, Amendment 39-23387 (91 FR 39854, 
July 1, 2026) (AD 2026-13-05).

(c) Applicability

    This AD applies to all The Boeing Company Model 737-8, 737-9, 
and 737-8200 airplanes, certificated in any category.

(d) Subject

    Air Transport Association (ATA) of America Code 21, Air 
Conditioning.

(e) Unsafe Condition

    This AD was prompted by reports of in-flight events of excessive 
cabin and flight deck temperatures that could not be controlled by 
the flightcrew using existing procedures and a determination that 
there is a formatting error in appendix 5 of AD 2026-13-05 that must 
be addressed. The FAA is issuing this AD to address a tripped BAT 
BUS SECT 2 or environmental control systems (ECS) circuit breaker 
that could lead to an air conditioning system malfunction causing an 
uncontrollable, excessively high temperature in the cabin and flight 
deck. The unsafe condition, if not addressed, could lead to injury 
or incapacitation of flightcrew and passengers, which could result 
in the inability to maintain safe flight and landing.

(f) Compliance

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

(g) Retained Revision of Existing Airplane Flight Manual (AFM), With No 
Changes

    This paragraph restates the requirements of paragraph (g) of AD 
2026-13-05, with no changes. Within 30 days after February 24, 2026 
(the effective date of AD 2026-04-05, Amendment 39-23265 (91 FR 
8708, February 24, 2026)), revise the Operating Procedures section 
of the existing AFM to include the information specified in 
appendices 1 through 3 of this AD. This may be done by inserting a 
copy of appendices 1 through 3 of this AD into the AFM. 
Accomplishing the revision of the existing AFM required by paragraph 
(h)(1) of this AD terminates the requirement of this paragraph to 
include the information specified in appendix 1 of this AD in the 
existing AFM.

(h) Retained Revision of Existing AFM, With a Corrected Appendix 5

    This paragraph restates the requirements of paragraph (h) of AD 
2026-13-05, with a corrected appendix 5. Within 30 days after July 
16, 2026 (the effective date of AD 2026-13-05), revise the Operating 
Procedures section of the existing AFM as required in paragraphs 
(h)(1) and (2) of this AD.
    (1) Replace the information specified in appendix 1 of this AD 
with the information specified in appendix 4 of this AD. This may be 
done by removing a copy of appendix 1 of this AD from the existing 
AFM and inserting a copy of appendix 4 of this AD into the existing 
AFM. Accomplishing the revision required by this paragraph 
terminates the requirement of paragraph (g) of this AD to include 
the information specified in appendix 1 of this AD in the existing 
AFM.
    (2) Include the information specified in appendices 5 and 6 of 
this AD. This may be done by inserting a copy of appendices 5 and 6 
of this AD into the existing AFM.

(i) Alternative Methods of Compliance (AMOCs)

    (1) The Manager, AIR-520, Continued Operational Safety 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) 
of this AD. Information may be emailed to: [email protected].
    (i) Before using any approved AMOC, notify your appropriate 
principal inspector, or lacking a principal inspector, the manager 
of the responsible Flight Standards Office.
    (ii) AMOCs approved for AD 2026-13-05 are approved as AMOCs for 
the corresponding provisions of this AD.
    (2) 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, AIR-
520, Continued Operational Safety 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.

[[Page 42852]]

(j) Additional Information

    For more information about this AD, contact Derrick Herrera, 
Aviation Safety Engineer, FAA, 2200 South 216th St., Des Moines, WA 
98198; phone: 817-222-5140; email: [email protected].

(k) Material Incorporated by Reference

    None.
BILLING CODE 4910-13-P

Appendix 1 of AD 2026-14-11--Cabin Temperature Hot Procedure
[GRAPHIC] [TIFF OMITTED] TR13JY26.000


[[Page 42853]]


[GRAPHIC] [TIFF OMITTED] TR13JY26.001


[[Page 42854]]


[GRAPHIC] [TIFF OMITTED] TR13JY26.002


[[Page 42855]]


[GRAPHIC] [TIFF OMITTED] TR13JY26.003


[[Page 42856]]



Appendix 2 to AD 2026-14-11--Cabin Temperature Hot BAT BUS SECT 2 
Circuit Breaker Trips Procedure
[GRAPHIC] [TIFF OMITTED] TR13JY26.004


[[Page 42857]]


[GRAPHIC] [TIFF OMITTED] TR13JY26.005


[[Page 42858]]


[GRAPHIC] [TIFF OMITTED] TR13JY26.006


[[Page 42859]]



Appendix 3 of AD 2026-14-11--PACK Procedure
[GRAPHIC] [TIFF OMITTED] TR13JY26.007


[[Page 42860]]


[GRAPHIC] [TIFF OMITTED] TR13JY26.008


[[Page 42861]]


[GRAPHIC] [TIFF OMITTED] TR13JY26.009


[[Page 42862]]



Appendix 4 of AD 2026-14-11--New Cabin Temperature Hot Procedure
[GRAPHIC] [TIFF OMITTED] TR13JY26.010


[[Page 42863]]


[GRAPHIC] [TIFF OMITTED] TR13JY26.011


[[Page 42864]]


[GRAPHIC] [TIFF OMITTED] TR13JY26.012


[[Page 42865]]


[GRAPHIC] [TIFF OMITTED] TR13JY26.013


[[Page 42866]]



Appendix 5 of AD 2026-14-11--Cabin Temperature Hot PACK CONT VALVES 
RIGHT or LEFT Circuit Breaker Trips Procedure
[GRAPHIC] [TIFF OMITTED] TR13JY26.014


[[Page 42867]]


[GRAPHIC] [TIFF OMITTED] TR13JY26.015


[[Page 42868]]



Appendix 6 of AD 2026-14-11--ZONE TEMP Procedure
[GRAPHIC] [TIFF OMITTED] TR13JY26.016


    Issued on July 9, 2026.
Brian Knaup,
Acting Deputy Director, Integrated Certificate Management Division, 
Aircraft Certification Service.
[FR Doc. 2026-14090 Filed 7-9-26; 4:15 pm]
 BILLING CODE 4910-13-C

The complete text was extracted from the official GovInfo HTML edition for this publication. Acquired 2026-10-09T00:47:26.413249+00:00. Text extraction preserves the recorded source wording; it does not determine current requirements.

Open the captured official edition

Source SHA-256

28023ea0774d10e6fa6bc71969b2b1be30ffaae7edfda12992b69206a40565aa

Text SHA-256

5c9e71f97f3e3c3c109be8f2034a103b4c58ef619ab39f63809374bb194462fc