Originally Posted by
Just This Once...
So being unable to use the electric trimmers whilst pulling back on the column is a design feature, hard-wired into the system.
Not so keen on that idea.
Only trim in the
opposing direction is stopped, and
all electric trim in the
opposing direction is stopped. The only way to trim
forward whilst pulling
back would be manual trim wheel.
This is one of the simplest and neatest examples of Boeing philosophy of helping the pilot not do stupid but never by overriding the pilot's primary control inputs. This
was a good system, but not any more. MCAS broke the system. Now there is another way to trim forward whilst pulling back - just let HAL do it for you, all the way down.