The VARTOMS Mode Selector on the main switch panel is controlled by which pushbutton?

• A. AUTO pushbutton
• B. OFF pushbutton
• C. TEST pushbutton
• D. MAN pushbutton

Answer: (D)

The pushbutton labeled MAN is used to control the VARTOMS Mode Selector because MAN stands for manual control. When you press it, you put the VARTOMS system into manual mode, allowing the operator to choose the mode directly rather than relying on the system to switch modes automatically.

Other pushbuttons serve different roles: AUTO keeps the system in automatic mode where it selects modes based on predefined criteria, TEST runs a self-check of the VARTOMS, and OFF disables or powers down the VARTOMS. Since the question asks which button explicitly gives you direct, hands-on control of the mode, the manual pushbutton is the correct one.