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The following Thread is from a post sent to me by a friend (so sharing as received) but I have fact-checked it with a Pilot friend as valid. It helps to explain what MAY have happened with d Ethiopian that crashed & killed many innocents.
This is 2nd crash in 6month for 737 Max8. 157 pple just died in a tragic crash. The crew & passengers of Ethiopian Airline Flight # ET302 on board a brand new Boeing 737 MAX 8 never had a chance. The less than 3 months old plane had a new software in it. They called it MCAS or...
...Maneuvering Characteristics Augmentations System. MCAS was a system that didn't exist in any of the Boeing 737's before. However, when they built the 737 MAX version, in layman's term, they built the plane with a larger and more efficient engine...
However, this larger engine, which delivered a further 14% fuel efficiency had to be fitted further forward under the low wings of the 737. This potentially may cause the plane to stall. Stalling is bad. It is basically when a plane stops flying and starts falling....
In order to avoid this, Boeing installed the new MCAS software. This software is designed to tell the plane to move its nose down to increase its speed and avoid it from stalling. So here comes the problem. In the computer world, we have this term called GIGO....
The old school fellas will know this. Yes. Garbage In, Garbage Out. The problem based on the findings so far is this. On the plane there is a sensor called the Alpha Vane which measures the Angle of Attack (AOA) of the plane. It looks like a small little wing...
...and they have two of it, one on the pilot side, & the other on the co-pilot's.
The sensor's job is to tell the computer the angle the plane is flying at. And if the AOA of the plane is too high, this will result in d plane stalling. Typically the AOA is below 15 to 20 degrees
...and the new MCAS software will push d plane's nose down if it thinks that d AOA is too high.
With this flight, d Alpha Vane sensor measuring d AOA on d Captain's side was reported to be faulty. So they changed it. Same was reported from d equally harrowing flight fr Bali
...On the fateful final flight, d plane which arrived from Bali d night before, had the sensor changed, & then it took off in d morning. No one knew what was really wrong with d plane, or about d new MCAS software. No one. Not the maintenance folks, and in fact not even the pilot
...He apparently wasn't trained on it yet. So they flew the plane.
And once in the air, d faulty sensor told d computer that d plane is stalling. The computer then, without d pilot ever knowing pushed d nose of d plane down further, while the pilot was trying to raise the plane.
In this battle between the pilot and the computer, the computer won. And the pilot, the crew, and the passengers lost and they died. The plane was too low, and the pilot didn't have enough air to raise the plane and fly it. The computer literally flew the plane into the ocean...
A few wks later, Boeing issued update on d plane, & informed that should d plane have an issue with it's AOA sensors, one of d way to stop d computer was to SWITCH it off! Apparently, 189 lives on Ethiopian could have been saved, had d pilot known about d software, & turn it off
A single switch was d difference betw life & death. Computers are really going to be the end of us; because while a man makes mistakes, to really, really screw up; u need a computer!
This is d initial verdict of what happened & why nations are banning d plane until further notice
There are however some reports that claim there is no effective off switch once the computer takes over and that this was a design problem from manufacturers. Uncertainty is making nation after nation take a cautious path of banning the plane in the meantime.
Pilots will need retraining on this specific issue and the airworthiness of the plane will need to be reassessed. If in the end these tragic accidents are found to have been preventable, then all stakeholders in the airline industry will have cases to answer. May their souls RIP
As Boeing grounds entire crash aircraft fleet worldwide...

Boeing has grounded its entire global fleet of 737 Max aircraft after investigators uncovered new evidence at the scene of the fatal Ethiopian Airlines crash.
The US plane-maker said it would suspend all 371 of the aircraft.... MORE WILL BE REVEALED IN THE WEEKS AHEAD I AM SURE.
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