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The engines remained at full take-off power as the airline’s youngest-ever but highly-experienced captain, a 29-year-old with 8,122 hours of flying time, and his 25-year-old co-pilot, with 361 hours, flew the aircraft out of its initial climb. That would be an unusual step in a regular flight, according to the experts and five current and former pilots interviewed by Reuters, most of whom were not authorized to speak publicly. “You would never, ever have full power for the whole flight,” said Hart Langer, a veteran former senior vice president for flight operations at United Airlines.
The Ethiopian Airlines statement suggested the crew left the throttles at take-off power because they intended to continue to climb and were hampered by the nose-down commands of MCAS, By the end, the aircraft was traveling at 500 knots (575 mph, 926 kph), far beyond the Boeing jet’s operating limits, The Ethiopian Airlines statement said “no excess speed was noted at the initial phases of the flight.”, The aircraft’s gathering speed and its downward “trim” when MCAS switched on for the last time may have contributed to a situation in star wars cufflinks which the pilots were unable to fight flawed Boeing software that eventually sent the jet into an uncontrollable dive, the four experts said after studying the data..
Trim is a manual or automatic setting that helps to keep the plane on a desired up or down trajectory by making it harder for pilots to pull the other way. The Ethiopian Airlines crash, and another in Indonesia five months earlier, have left the world’s largest planemaker in crisis as its top-selling jetliner is grounded worldwide, and Ethiopia scrambling to protect one of Africa’s most successful companies. All 737 MAX aircraft have been grounded and Boeing is working on an MCAS software fix and extra training that it says will prevent a repeat of such accidents.
CEO Dennis Muilenburg said on Friday the two 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 star wars cufflinks 12 seconds after take-off, A sudden spike in black box data was consistent with a bird or other debris hitting the plane as it was taking off, shearing away a vital airflow sensor, said the four experts and two U.S, officials briefed on the data..
Ethiopian Airlines on Sunday called that scenario “completely speculative”. Chief investigator Amdye Ayalew Fanta said on Thursday there was no indication of such damage. Boeing said it would not comment on ongoing investigations. As with the Lion Air crash in Indonesia, faulty data from the ‘angle of attack’ sensor, which measures how the wing is cutting through the air, may have set off a volatile chain of events. In both cases, the faulty sensor tricked the plane’s computer into thinking the aircraft was about to stall, or lose lift. The anti-stall MCAS software then pushed the nose down forcefully by intervening in the aircraft’s trim system.
The first time the MCAS software kicked in, flight data shows the Ethiopian Airlines pilots reacted quickly by flicking switches under their thumbs - they had recognized the movements as the same type flight crews had been warned about after the Lion Air crash, 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 star wars cufflinks airport, so low that a new warning - a computerized voice saying “don’t sink” - sounded in the cabin..
When MCAS triggered again, the jetliner’s trim was set to push the nose down at almost the maximum level, flight data shows, while the control column noisily vibrated with another stall warning called a “stick shaker.”. This time, the pilots countered MCAS to greater effect, the experts said after studying the data. But when they turned off the system - as they were instructed to do by Boeing and the U.S. Federal Aviation Administration (FAA) in the wake of the Lion Air disaster - the nose was still trimmed downwards, making it harder to pull up the plane.
The combination of the plane’s speed - edging up towards design limits with the engines still at their take-off power - and the trim setting star wars cufflinks meant the pilots would have had to exert 50 pounds of force to pull back the control columns, the four experts and one of the pilots said, and moving a backup manual wheel instead was impossible, Ethiopian Airlines’ position is that the control problems only resulted from the crew’s losing battle with MCAS, a source familiar with the airline’s thinking said, Boeing declined to comment, The preliminary report did not cover this issue..