Safety experts recommended Wednesday that the engines on Boeing's troubled 737 Max airplanes and some Airbus models be modified quickly to prevent smoke from filling the cockpit or cabin after a safety feature is activated following a bird strike.

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.

The National Transportation Safety Board (NTSB) has issued a rare and “urgent” bulletin recommending safety modifications for some engines on Boeing and Airbus planes.