412 SAS/ATT
Shawn,
I agree that you are temporarily removing the systems ability to maintain attitude by moving the cyclic and do not disagree for a second that it is entirely possible to accurately hover or manoeuvre using this method.
My contention is that the ATT system works by extending and contracting actuators which need something to push against to do their job of passing that movement to the flight controls.
The way that you are temporarily removing the ATT part of the system is to move the bit that the actuators push against i.e the cyclic held in place by the force trim! As you move the cyclic (without pressing the trim release and selecting Modified SAS Mode) you are not disabling the input from the AHRS and the actuators are still moving but now have nothing to push against so end up in an incorrect position - perhaps explaining why the cyclic/flight controls are in a less than perfect position (not the original datum) when you release them
Not sure that is what Mr. Sperry originally intended which is why he fitted a trim release button.
Trog
Last edited by Troglodita; 15th April 2012 at 15:10.