2026-04-05: Electrical Power

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 adding the following new airworthiness directive: 2026-04-05 The Boeing Company: Amendment 39-23265; Docket No. FAA-2026-1332; Project Identifier AD-2026-00084-T. (a) Effective Date This airworthiness directive (AD) is effective February 24, 2026. (b) Affected ADs None. (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 24, Electrical Power. (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 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) Revision of Existing Airplane Flight Manual (AFM) Within 30 days after the effective date of this AD, 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. (h) 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 (i) 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. (i) 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 (j) Material Incorporated by Reference None. BILLING CODE 4910-13-P Appendix 1 of AD 2026-04-05-Cabin Temperature Hot Procedure ER24FE26.000 ER24FE26.001 ER24FE26.002 ER24FE26.003 Appendix 2 to AD 2026-04-05-Cabin Temperature Hot BAT BUS SECT 2 Circuit Breaker Trips Procedure ER24FE26.004 ER24FE26.005 ER24FE26.006 Appendix 3 of AD 2026-04-05-PACK Procedure ER24FE26.007 ER24FE26.008 ER24FE26.009 Issued on February 17, 2026. Lona C. Saccomando, Acting Deputy Director, Integrated Certificate Management Division, Aircraft Certification Service. [FR Doc. 2026-03615 Filed 2-20-26; 4:15 pm]BILLING CODE 4910-13-P