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Ethiopia Reveals Initial Boeing 737 MAX Crash Findings
The Ethiopian Ministry of Transport’s Aircraft Accident Investigation Bureau released its Interim Investigation Report regarding the 2019 Ethiopian Airlines 737 MAX crash. The report goes over the crash and the events leading up to it in excruciating detail. (simpleflying.com) और अधिक...Sort type: [Top] [Newest]
Think for a minute that instead of a possible bird strike disabling the left AOA vane allowing it to give false information, a flock of birds damages both left and right AOA vanes and they both erroneously send info back to the aircraft that is in a stall scenario? However the aircraft attitude, speed, rate of climb are all normal but both stick shakers are firing, the aircraft is trying to trim itself downwards because of known/unknown MCAS...thrust is at climb power! The crew finally turn off the trim cut-out switches while manually trimming but do not reduce power. The aircraft still about 7000’ above ground and now in 100’ fpm descent and almost under control.....the crew decides to turn the cut-out switches back on (probably because they are uncomfortable hand flying) to get the autopilot back and the aircraft dives into the ground at over 5000’ fpm. Bad design for sure, poorly trained crew probably, sign of the times by pushing both aircraft and pilots out the door without adequate testing......definitely. Just an opinion.
I've heard of both AOA sensors being waterlogged before takeoff and freezing in flight, but if two birds got close enough to seriously damage either AOA sensor, it'd be all but guaranteed that other things on the airplane would be damaged as well.
I was just using a flock of birds as an example that if both AOA’s were damaged and giving bad information and the aircraft was flying normally except that MCAS activated, the QRH or memory items for runaway trim are the same....cut out switches to off. It wouldn’t matter if Boeing wired one or two AOA sensors into MCAS as the crew actions are the same. However, they Boeing should never have been allowed to deliver an aircraft with just one warning sensor wired and an optional light?
Yes, there have been many accidents in the past where systems relying on single sensors for information were a factor. But that's my only criticism of Boeing in regards to the 737 MAX.
It strikes me as a pretty significant criticism. This was done to circumvent training and type certification requirements. It is at a bare minimum a moral outrage, with both Boeing and Southwest Airlines to blame.
Lack of training between aircraft variants was a factor in the crash of British Midland Flight 92 in 1989.
Where do you get the idea of the plane being 7000' above the ground? The Addis airport is at nearly 7000' elevation. This explains the continued take-off thrust, the rapid acceleration and the very short duration of the flight.