Alternate pitch trim levers Always have the highest priority as they are mechanically linked to the STCM's. Their primary function would be to control stab movement if the PFC's (elevator offload function) or the 'pickle' s/w's failed to do so, or command the stab to move if there was a failure of the 28vdc supply from the right and centre PSA's.
You could use them at any time BUT the stab would move at full speed. 0.5 deg/sec.
In direct mode you would still use the 'pickle' s/w's.