The National Transportation Safety Board warned that certain CFM engines installed in some Boeing 737 Max jets may feed smoke into the cockpit or cabin after a bird strike.

The National Transportation Safety Board is issuing a rare urgent safety bulletin warning of potential problems with the jet engines on Boeing 737 Max aircraft.

US safety investigators urge immediate action on Boeing 737 Max engine issues that could lead to smoke in the cockpit and cabin after bird strikes. The NTSB calls for the FAA to alert flight crews and revise safety procedures while work on a software update is underway.