What does the data say?
Non-pilot but expert number cruncher with a basic questions about the DATA shown in post 69 and several prior to that.
Looking at the ADS-B numbers, in ascending time sequence from the start of the takeoff roll at 05:38:01Z, I see:
18 seconds with 0 elevation gain (to 7,200') and acceleration from 0 to 93 knots (ETH-302 still on the runway?)
5 seconds with 25' elevation gain (to 7,225') and acceleration from 93 to 105 knots (ETH-302 still on the runway?)
11 seconds with 00' elevation gain (to 7,225') and acceleration from 105 to 154 knots
11 seconds with 25' elevation LOSS (to 7,200') and acceleration from 154 to 183 knots (did ETH-402 try to lift off runway and then settle back on to it?)
14 seconds with 25' elevation gain (to 7,225') and acceleration from 183 to 200 knots
59-seconds after beginning the takeoff roll - the plane was at 200-knots and had gained NO altitude above the runway (based on elevation at 105-knots). Is that possible?
At 59-seconds there could not be much of the ~12,465' runway left ahead of the plane since it had been doing an average of 150-knots (250 fps) for 33-seconds (8,250') and had travelled about 3,000' accelerating in the first 26-seconds.. At what point would the takeoff be rejected? Or is this just a normal takeoff at a hot and high airport?
I assume MCAS could not have been active during the first 60-seconds of the takeoff event.
Continuing with the sequential timestamps:
50-seconds with 925' elevation gain (to 8,150') and acceleration from 200 to 263 knots.
25-seconds with 450' elevation LOSS (to 7,700') and acceleration from 263 to 323 knots.
45-seconds with 900' elevation gain (to 8,609') and acceleration from 323 to 283 knots.
From the time ET-402 reached 226-knots at 7,575' there were 33 ADS-B reports of which only 7 showed a loss of altitude and they all occurred in a 21-second period (5:39:55 to 5:40:16)
During the period 5:40:09 to 5:40:45 the plane maintained an altitude of 7,750' +25'/-50'.
From 5:40:35 to 5:41:02 (end of data) the plane climbed steadily and gained 875' while accelerating to 383-knots.
How does the data above fit with the theory of MCAS forcing a rapid descent?