Ethiopian Airlines crash: What is the MCAS system on the Boeing 737 Max 8?

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Ethiopian Airlines crash: What is the MCAS system on the Boeing 737 Max 8?
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WASHINGTON: Similarities between the Lion Air and Ethiopian Airlines crashes, confirmed by black box data, have focused attention on an ...

WASHINGTON: Similarities between the Lion Air and Ethiopian Airlines crashes, confirmed by black box data, have focused attention on an anti-stalling system used in the new Boeing 737 Max 8 aircraft.

MCAS was introduced by Boeing on the 737 Max 8 because its heavier, more fuel-efficient engines changed the aerodynamic qualities of the workhorse aircraft and can cause the plane's nose to pitch up in certain conditions during manual flight. According to Boeing, MCAS does not control the plane during normal flight but"improves the behaviour of the airplane" during"non-normal" situations.

The pilots of the Ethiopian Airlines plane reported similar difficulty before the aircraft plunged into the ground shortly after takeoff.A preliminary report on the Lion Air Flight 610 accident blamed it in part on a faulty angle of attack sensor that triggered the MCAS system and automatically forced the plane's nose down.

Following the Lion Air crash, Boeing issued a bulletin to airlines operating the 737 Max 8 advising pilots how to override the MCAS system. It said procedures already exist to"safely handle the unlikely event of erroneous data coming from an angle of attack sensor," the suspected cause of the Lion Air crash.

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