2026-13-05: Air conditioning

1. The authority citation for part 39 continues to read as follows: Authority: 49 U.S.C. 106(g), 40113, 44701. 2. The FAA amends § 39.13 by: a. Removing Airworthiness Directive (AD) 2026-04-05, Amendment 39-23265 (91 FR 8708, February 24, 2026); and b. Adding the following new AD: 2026-13-05 The Boeing Company: Amendment 39-23387; Docket No. FAA-2026-4660; Project Identifier AD-2026-00423-T. (a) Effective Date This airworthiness directive (AD) is effective July 16, 2026. (b) Affected ADs This AD replaces AD 2026-04-05, Amendment 39-23265 (91 FR 8708, February 24, 2026) (AD 2026-04-05). (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. 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 a New Terminating Action for Appendix 1 This paragraph restates the requirements of paragraph (g) of AD 2026-04-05, with a new terminating action for appendix 1 of this AD. Within 30 days after February 24, 2026 (the effective date of AD 2026-04-05), 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) New Revision of Existing AFM Within 30 days after the effective date of this AD, 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: AMOC@faa.gov . Before using any approved AMOC, notify your appropriate principal inspector, or lacking a principal inspector, the manager of the responsible Flight Standards Office. (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. (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: derrick.r.herrera@faa.gov . (k) Material Incorporated by Reference None. BILLING CODE 4910-13-P ER01JY26.000 ER01JY26.001 ER01JY26.002 ER01JY26.003 ER01JY26.004 ER01JY26.005 ER01JY26.006 ER01JY26.007 ER01JY26.008 ER01JY26.009 ER01JY26.010 ER01JY26.011 ER01JY26.012 ER01JY26.013 ER01JY26.014 ER01JY26.015 Issued on June 26, 2026. Brian Knaup, Acting Deputy Director, Integrated Certificate Management Division, Aircraft Certification Service. [FR Doc. 2026-13241 Filed 6-29-26; 11:15 am]BILLING CODE 4910-13-P