BoeingCopyright: Boeing
Over the last five months, there have been two fatal crashes of Boeing 737 Max planes.
Due to safety concerns pending the outcomes of investigations, Boeing's entire fleet of 737 Max planes has been grounded worldwide, and it is not clear when the planes will be allowed to fly again.
Initial investigations strongly suggest a problem with the plane's software control systems.
The Boeing 737 Max comes with a multitude of sensors to detect when there is a problem with the plane in flight due to the angle it is flying at, such as the plane encountering turbulence, or stalling.
The plane's computer relies on information coming from the sensors to make adjustments in flight.
The focus is on the Manoeuvring Characteristics Augmentation System (Mcas), which is designed to keep the plane from stalling, by reacting to a set of sensors which detect whether the jet is climbing at too steep an angle.
An investigation of the Lion Air flight last year suggested the system malfunctioned, meaning that the plane's computer forced the nose of the plane down more than 20 times, before it crashed into the sea, killing all 189 passengers and crew.
The US Federal Aviation Administration (FAA) says there are similarities between that crash and the Ethiopian accident on 10 March.
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