NTSB Recommends Modifications to LEAP-1B Engines Some CFM International jet engines allowed smoke to enter the cockpit or cabin when damaged 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
NTSB raises serious concerns over LEAP-1B engines - AeroTime The safety agency also issued additional recommendations to evaluate the potential for the same issue with LEAP-1A and -1C engines LEAP-1B engines are used exclusively by Boeing 737 MAX jets while LEAP-1A and -1C engines are used on some variants of the A320neo family aircraft and COMAC C919s
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