How flawed software and excess speed doomed an Ethiopian Airlines 737 MAX

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How flawed software and excess speed doomed an Ethiopian Airlines 737 MAX.

PARIS/SEATTLE/SINGAPORE - Minutes after take-off, the pilots of an Ethiopian Airlines 737 MAX were caught in a bad situation.

Moments later, the Boeing Co jet hit the ground, killing all 157 people onboard after six minutes of flight. The airline's youngest-ever but highly-experienced captain, a 29-year-old with a lengthy 8,122 hours flying time, and his 25-year-old co-pilot, with 361 hours, left the engines at full take-off power.

The Ethiopian Airlines statement suggested the crew left the throttles at takeoff power because they intended to continue to climb and were hampered by the nose-down commands of MCAS.The Ethiopian Airlines statement said"no excess speed was noted at the initial phases of the flight." Chief Executive Dennis Muilenburg said on Friday that both accidents were caused by a chain of events,"with a common chain link being erroneous activation of the aircraft's MCAS function."Sources who reviewed the crash data said the problems started barely 12 seconds after take-off.

But data shows they were not able to fully counteract the computer's movements. At that point, they were a mere 3,000 feet above the airport, so low that a new warning - a computerized voice saying"don't sink" - sounded in the cabin. In the meantime, the aircraft's speed remained abnormally high, the five pilots and four aviation experts said.

 

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