3 ms·
Control column position is not a delta. On a 737 that position directly correlates to the position of the elevator in degrees. Elevator position, stabilizer pos
by cmurf 8y ago
Control column position is not a delta. On a 737 that position directly correlates to the position of the elevator in degrees. Elevator position, stabilizer position, and airspeed as they were we can infer a force; corroborated by their own words, it's reasonable that this situation is described in the "mistrim nose down" sketch about 1/3 of the way down here:
https://www.satcom.guru/2019/04/stabilizer-trim-loads-and-range.html https://www.satcom.guru/2019/04/stabilizer-trim-loads-and-ra...
05:41:30 - PIC requests SIC to pitch up with him
05:41:46, 05:41:54 manual trim not working, that is absolutely a trim wheel hand crank attempt; fairly clear (to me) but not stated is that both pilots were not simultaneously cranking on the trim wheel, there's plenty of anecdotal evidence that this exact configuration puts to much upward force on the jackscrew that it is difficult to impossible to turn.
05:43:04, PIC asks SIC to pitch up together says pitch is not enough
As for the noisiness of the control column position data, it could be partly the stick shaker, it could be light turbulence, the accel vert row at the bottom shows it's a bumpy flight, and pitch and roll attitude is also variable but less so than vertical accelerate. And accel vert gets noticably more perturbed as airspeed increases. I think it's light to moderate turbulence, but I'm not certain. A search for PIREPs and weather reports at the time could corroborate it.
- treis 8y ago>we can infer a force Right, and my point is that until someone actually does that calculation we don't know how high that force was.