Originally Posted by
Chiefttp
FDR,
Any blame accorded to the Ethiopian pilot who left the throttles, ooops I mean Thrust Levers at max power the whole time? Isn’t that the reason why the manual trim system was ineffective due to the excessive speed and high loads on it?
You seem to have convieniently ignored the Autothrottle issue whereby while the pilots were busy trying to figure out the MCAS issue amid the myriad or alarms, the autothrottle was silently accelerating well past the speed set by the pilots.
From ET-302 Interim Investigation Report - p13
"At 05:39:42, the crew engaged Level Change mode and set MCP speed to 238kt"
Description taken from piece by Seattle Times, March 7th 2021
According to the interim investigation report released a year ago, the faulty Angle of Attack sensor on Flight ET302, even before it triggered MCAS to push the plane’s nose down, interfered with other sensor readings of altitude and airspeed. Registering the plane as still below 800 feet above the ground even after it passed that threshold, the jet’s computer had the autothrottle maintain full takeoff thrust for 16 seconds after it should have reduced the power for the climb phase. More significantly, seconds later the pilots set the jet’s speed target at 238 knots, but the autothrottle didn’t follow through. Again because of the faulty sensor on the left, the flight computer detected the discrepancy between the left and right airspeed values and flagged the data as invalid. Unable to validate the aircraft’s speed, the computer stopped sending thrust instructions to the autothrottle. As a result, the engines remained at maximum thrust for the rest of the fatal flight. The plane eventually exceeded the 737’s maximum design speed of 340 knots. This so increased the forces on the jet’s tail that the pilots couldn’t budge it manually.