FAA issues immediate AD 2026-04-05 for Boeing 737 MAX over ECS ground‑wire fault causing cabin and flight‑deck overheating
The FAA issued an immediately effective airworthiness directive (AD 2026-04-05) for Boeing 737 MAX 8, 9 and 8200 aircraft after identifying a ground‑wire fault in the environmental control system that can produce dangerous overheating in the cabin and flight deck, requiring revised procedures and manual updates.