Newly stringent FAA tests spur a fundamental software redesign of Boeing 737 MAX flight controls - Grounded for Much Longer Time?
"This is a huge deal," said Peter Lemme, a former flight-controls engineer at Boeing and avionics expert.
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August 1, 2019 - by Dominic Gates for seattletimes.com
- That notion was ruled out by FAA pilots in June when, during testing of the effect of a glitch in the computer hardware, one out of three pilots in a simulation failed to save the aircraft.
After two deadly crashes of Boeing's 737 MAX and the ensuing heavy criticism of the Federal Aviation Administration (FAA) for its limited oversight of the jet's original certification, the agency conducted newly stringent tests that in June uncovered a potential flaw and have spurred Boeing to make a fundamental software-design change.
(video of Boeing 737 MAX cockpit)
As the FAA re-evaluates and recertifies the updated flight-control systems, it has specifically rejected Boeing's assumption that the plane's pilots can be relied upon as the backstop safeguard in scenarios such as the uncommanded movement of the horizontal tail involved in both the Indonesian and Ethiopian crashes. That notion was ruled out by FAA pilots in June when, during testing of the effect of a glitch in the computer hardware, one out of three pilots in a simulation failed to save the aircraft..
David Hinds, a retired Boeing flight controls and autopilot expert, said that clearly "something got missed" in the original MAX certification of MCAS and now this microprocessor fault...
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