Seattle - After the deadly crash of a Lion Air Boeing 737 MAX 8 last week, the American manufacturer is preparing to send a safety warning to all 737 MAX operators that a potential failure of the flight monitoring system could cause the aircraft to dive sharply.

The warning comes as a service bulletin following preliminary findings of the ongoing investigation to reveal the cause of the accident. It explains what pilots should do in such a situation.

The MAX jets will automatically try to push down the nose if they detect that a stall is possible.

While further aspects of the service bulletin aren’t known yet, the warning is the first tangible outcome of the investigation.

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Boeing has a safety procedure that enables pilots to continue flying in case of a wrong angle of attack reading.

Following the initial investigation, experts have focused on a sensor that tells the pilots and the flight control computer the angle of attack of the aircraft. The concerns now raised over a faulty flight sensor that might potentially provide a false attack angle information to the flight computer.

To date, Boeing has delivered 219 Max family aircraft to the customers around the world. The latest and most advanced single-aisle jet is the biggest profit source of the American manufacturer.

Boeing has more than 4,500 orders for the MAX jets in its backlog. The re-engineered single-aisle variants feature larger fuel-efficient engines, more aerodynamic wings and an enhanced cockpit with larger displays.