When the rotary switch located in the vehicle cab is placed in position 2 or 4 the
operators panel runs through a check sequence of operations required for the
launcher to be fully powered. Should a failure occur this will be indicated by the
sequence of lights not fully illuminating with the error occurring at the first none
illuminated light on the Bridge Build Select sub-panel (10).
The status of the parking brake and the gearbox being selected to neutral are
indicated by annunciators on the Vehicle Status sub-panel (11).