The center position of the switch disables the enable and inhibit functions. The center position disables the tripped and inhibited functions. The center position of the switch on panel R13 or panel C3 disables the clear and read functions. The B switch functions the same as the A switch for system B tone generators. The right position functions the same as the left, except for the right five columns of lights.
Annunciator lights provide visual indications of the status of the vehicle and payload systems.
The annunciator lights are classified as emergency, warning, caution and advisory. Annunciator lighting is provided by incandescent lamps that illuminate the lens area of the annunciators. Most annunciators are driven by an annunciator control assembly that controls the illumination of the lights during a normal or test input and the brightness level. There are three different lens configurations for push button indicator and indicator lights. One configuration has illuminated nomenclature in the appropriate color on an opaque black background, and the nomenclature cannot be seen until it is illuminated.