Notice the HUGE discrepancy between the two AoA sensors (20+ degrees). Notice that MCAS is *still* forcing the nose down.

In ME7, this would be noticed by the monitor, which would throw an implausibility code. At that point, it would disable anything that would use that input, unless you are stupid enough to disable implausibility checks. Have fun running your airplane into the ground.

Thats really really sad.

https://www.seattletimes.com/business/boeing-aerospace/black-box-data-reveals-lion-air-pilots-struggle-against-boeings-737-max-flight-control-system/


This should trigger an implausibility fault and MCAS should be disabled, and both inputs ignored. It should not be up to the pilot to disable MCAS.


But apparently, no such fault was triggered, so it just randomly chose a sensor to use.

Yes, this is exactly what happens when a hack ME7 "pro tuner" decides to just disable a DTC.

What I don't understand is which sensor is "wrong".

Right (green) clearly can't be right, it's showing negative alpha during climbout.

But if left (red) is right, then MCAS is properly triggering, since red is showing a much higher AoA.

The only reasonable answer is that neither reading is right. Right is reading too high, and left is reading too low. Really strange.

Unfortunately, the NTSB doesn't trust the average schmo with technical information, and you'll never see the mainstream media do any useful reporting on anything technical.

Pathetic, really.

Rest assured this plane is grounded by every single country lol.. also its one thing to fuck around with ur own car,hopefully in a place with no traffic , and its one thing to fuck up something that 150+ travel on hourly...

Boeing is amazing , they are doing some good stuff but this is unacceptable.

Dang..thats fucked up, but apparently Lion Air wasnt the best at maintenance either to cut costs... I'll take my car on trips ( i know plane is one of the safest way to travel but whatever )

Pretty nuts.. btw Apologies for deleting that section from my post, but i did so because i dont see "430 knots" anywhere in the OP graph

Nyet, I am a pilot by profession and fly commercially, one thing that is not shown that graph is the throttle position ( speed is ). The whole reason Mcas was fitted to these new MAX aircraft was to over come the larger engines which where further forward and higher than the older NG ones, this meant with a change of power (not speed) setting the pitch moment was greater ( up or down ) and thus MCAS was fitted to correct this. Issue with these is that pilot training and conversion from the old aircraft to new ones was a 1 hour conversation including a supposed youtube video. With auto throttles, and the stage of flight they where, IE flap retractions and gear, the possibility for the MCAS to over correct is possible and then big changes in pitch to occur that the pilot due to lack of suitable training where not prepared for, leading to a war between a pilot that wants to 1 thing and a flight computer wanting to do the opposite. The planes wins and result is a non survivable pitch down. It is as much pilot lack of training, the system could of been turned off, as much as it is bad programming for allowing it, ie trip out. It could be the error was noted by the crew but the paper work allowed them to fly, The Mcas was seen , I believe as a flight enhancer rather than a safety critical item. Ie makes the crews life easier.

I agree with the AOA sensors, but generally the air date computer will take both sets of data and for the auto pilot use the sensor relating to the side which is flying, IE of the captain is flying on the left use the left hand AOA sensor, should this fail then the backup will be used, but typically a set limit of tolerance will be built in, ie 6degress then a fault flag will be given, this will be part of the whats called an MEL will give guidance to the pilots if they can fly with the error or not, and in some cases it will allow this.

I am no expert on this particular plane by any means but I know from experience until a problem happens it may have gone unnoticed for years and not been any issue. Computers are only as good as the people who program them or the people that use them.