Hope this helps.
STAB TRIM OVERRIDE switch
NORMAL
- normally guarded to ensure normal operation of the column actuated cutout switch
OVERRIDE
- bypasses the column cutout switches (if both fail)
- restores power to the stabilizer trim switches
- when this switch is placed in override, the main electric trim will operate when commanded regardless of control column position because the column cutout switches are bypassed
- if the stab is jammed you may be up against the column cutout switch (opposite force)
- use STAB TRIM OVRD switch to enable use of main electric stab trim again
- operational test of column cutout switches and OVRD switch:
- do this at the gate during your preflight
- while trimming with electric stab trim, oppose the trim by moving the column in the opposite direction
- column cutout switches should engage, stopping the electric stab trim input
- move the stab trim OVRD switch to OVRD
- trim should resume