Federal Register #2026-13241

FAA Mandates Flight Manual Updates for Boeing 737-8, 737-9, and 737-8200 Aircraft

The Federal Aviation Administration (FAA), under the Department of Transportation, has issued a new airworthiness directive for all Boeing Model 737-8, 737-9, and 737-8200 airplanes. - Government Buyer: - Federal Aviation Administration (FAA) - Office: Aircraft Certification Service - OEM Highlight: - Boeing is the sole Original Equipment Manufacturer (OEM) referenced - Services Required: - Revision of the Airplane Flight Manual (AFM) for 825 U.S. Boeing 737-8, 737-9, and 737-8200 aircraft - Update must include new flightcrew procedures and non-normal checklists for handling tripped BAT BUS SECT 2 and environmental control system (ECS) circuit breakers - Procedures address the risk of uncontrollable, excessively high cabin and flight deck temperatures, which could endanger crew and passengers - Notable Requirements: - No products, hardware, or part numbers are being procured - The directive mandates only AFM documentation updates, not physical modifications - This is an interim action pending further modification development by Boeing

Description

The FAA is superseding AD 2026-04-05 for Boeing Model 737-8, 737-9, and 737-8200 airplanes. The directive requires revising the airplane flight manual to include procedures if certain circuit breakers trip, specifically addressing the standby power control unit and environmental control system circuit breakers. The unsafe condition involves potential uncontrollable high temperatures in the cabin and flight deck, which could lead to injury or incapacitation of flightcrew and passengers, affecting safe flight and landing. The effective date of this directive is July 16, 2026, and comments are open until August 18, 2026.

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