NTSB Recommends Modifications to LEAP-1B Engines WASHINGTON (June 18, 2025) — The National Transportation Safety Board issued an urgent safety recommendation Wednesday to address the possibility of smoke entering the cockpit or cabin of airplanes equipped with CFM International LEAP-1B engines and issued additional recommendations to evaluate the potential for the same issue with LEAP-1A
NTSB Issues Urgent Safety Warning for Boeing 737 Max Engines These events prompted the U S National Transportation Safety Board (NTSB) to issue an urgent safety recommendation targeting planes equipped with CFM International LEAP-1B engines In its statement, the NTSB warned of the risk of smoke entering the cockpit or cabin due to potential engine oil leaks in the ventilation system