On the recent two crashes of Boeings 737 Max

[Rockin Robbins]

Originally Posted by Dowly

Can you point where, during the time the pilots had control of the plane, did they exceed 500 kts?

Dowly, when we're talking about airspeed, you can see (airspeed is the bottom red/blue line, one for each airspeed sensor) the last half of the flight was over Vmo for any altitude. Maximum operating airspeed for under 10,000 feet is 250 knots and the plane was over 300 for that entire time, gaining a 500 knot speed by time of impact, according to the graph from the Preliminary Accident Report. The differences in the speeds supplied by the two sensors reflects the badly out of trim state of the aircraft. Here's a better view of that graph: https://ibb.co/DwpPG45

And a transcript from a simulator session is basically irrelevant to the actual Ethiopian Airlines flight. 340 knots is already 90 knots over maximum flying speed for that altitude, OF COURSE trims are very difficult or even impossible to adjust. The plane was not designed to fly in extreme overspeed conditions. Mentour Pilot proved that, didn't he. Now reflect an additional 160 knots airspeed over the speed where Mentour Pilot couldn't adjust trim and reflect on the consequences of letting the plane get that far outside its rated flight envelope.

However, Mentour Pilot has withdrawn the video of his own volition because "it's wrong." No simulator session can say anything about the facts of what happened on that flight. The final accident report has not been issued and he acknowledged that publishing a "best guess" simulator run with conditions different from the actual flight was wrong and would result in people responding inappropriately to a video that was wrong to produce to begin with. "You subscribe to my channel because you want the facts." The deleted video was pure speculation based on a simulator set up with parameters not reflected in the facts of the case. Mentour Pilot made the right choice for the right reason. Your laborious typing of the transcript from that purely speculative video accomplished nothing at all toward evidence that the pilots don't bear the vast majority of the responsibility for the crash.

Like Mentour Pilot said in his deleted video, "don't try this at home, folks." It's really way beyond any reasonable flying of the aircraft, and not because of MCAS either. Rule #1: fly the plane. Rule #2: see rule #1. These pilots didn't fly the plane. In fact they turned control over, against Flight Manual instructions, to a known malfunctioning electric trim system. Had they followed procedures, they might have saved the flight.