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Experts are questioning whether the procedures outlined after the Lion Air crash were comprehensive enough to ensure pilots could recover from a real-life cockpit emergency with several distractions at a low altitude shortly after take-off rather than in a pre-planned simulator ride. A 737 MAX pilot said the resistance on the control yoke would be about four times normal and it could take a few dozen turns of the manual wheel to return the nose to the proper position, depending on the alignment when the switches were cut letter l cufflinks.
The preliminary report indicates the pilots tried to move their wheels together but were unable to raise the nose much at all by doing so. “It appears the flight crew reactivated electric trim,” former Boeing engineer Peter Lemme said. “But they only made a very small nose up adjustment – I would have expected them to immediately and without stopping move the stabilizer back into trim. The last MCAS command comes 5 seconds after their last manual trim command.” letter l cufflinks. The proper response to MCAS emergencies, Leeham Co analyst Bjorn Fehrm said, is to correct the dangerous nose-down “trim” using electronic thumb switches, then turn off MCAS and trim manually with the wheel..
But if the aircraft is going too fast, those electronic switches may not be effective, European regulators said in a 2016 memo letter l cufflinks. And failing to fully fix the trim before MCAS is deactivated can make it physically impossible for pilots to control the plane, Fehrm said. Under normal circumstances, trim is used to keep an aircraft flying level. At speeds up to 250 knots (288 mph) pilots can stabilize trim with the manual wheel. But when the speed rises towards 300 knots and higher, the wheel becomes impossible to turn as air rushing over control surfaces makes them harder to move, Fehrm said..
At the time when both pilots were unable to move the wheel, they were traveling at over 340 knots, the maximum operating speed of the airplane and clacker alarms were sounding. By the end of the fatal flight they had reached 500 knots. The plane’s engines were at 94 percent thrust on take-off and remained there for the rest of the flight. That is consistent with the pilots leaving the thrust setting in take-off mode throughout, aviation experts said letter l cufflinks. The 737’s air data computer also uses angle-of-attack (AOA) information to adjust airspeed readings. If it mistakenly thinks the angle of attack is high, it can trigger pilot warnings that airspeed and altitude data are unreliable on one of the pilot’s controls, according to former Boeing engineer Peter Lemme..
That leads to an unreliable airspeed checklist which involves turning off the autothrottle as well as setting engine thrust to 75 percent. The runaway stabilizer checklist to shut off MCAS also says to turn off autothrottle. However, according to the flight data recorder, the pilots never reduced the thrust from 94 percent. “The report does not address information about unreliable airspeed procedures which should be considered because they had erratic airspeed,” said Greg Feith, a former senior air safety investigator with the National Transportation Safety Board letter l cufflinks.