FAA Adds New Circuit Breaker Rules for 737 Pilots
Published Date: 7/1/2026
Rule
Summary
The FAA is updating safety rules for Boeing 737-8, 737-9, and 737-8200 airplanes to add new instructions for pilots if certain circuit breakers trip. This update keeps the old rules and adds new checklists to keep flights safe. Airlines must update their flight manuals by July 16, 2026, with no big costs expected but important safety improvements.
Analyzed Economic Effects
3 provisions identified: 1 benefits, 2 costs, 0 mixed.
Passengers and crew gain safety checks
This rule adds new AFM procedures for pilots to follow if certain BAT BUS SECT 2 or environmental control system (ECS) circuit breakers trip, including controlled descent, attempts to reset, and selecting engine bleed switches OFF. The AD is intended to prevent uncontrolled, excessive cabin and flight deck temperatures that could injure or incapacitate flightcrew or passengers and could affect safe flight and landing.
Airlines must update AFMs fast
If you operate Boeing 737-8, 737-9, or 737-8200 airplanes, you must revise the Operating Procedures section of your airplane flight manual (AFM) within 30 days after July 16, 2026 to add new non-normal checklists (appendices 4, 5, and 6) and replace appendix 1 with appendix 4 as specified. This requirement applies to all Boeing Model 737-8, 737-9, and 737-8200 airplanes certificated in any category.
FAA cost estimate for AFM changes
The FAA estimates this AD affects 825 U.S.-registered airplanes. The agency estimates one work-hour at $85 per AFM revision for the retained actions (cost per product $85; cost on U.S. operators $70,125) and one work-hour at $85 for the new AD action (cost per product $85; cost on U.S. operators $70,125).
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