Which indicator warns that the Night Vision System is not cooled?

• A. Amber night status indicator
• B. Green indicator
• C. Red indicator
• D. Blue indicator

Answer: (A)

The Night Vision System relies on proper cooling to keep the image intensifier tube from overheating. When cooling isn’t active or is insufficient, the system can degrade in performance or be damaged, so the indicator set is designed to alert you quickly. The amber night status indicator is the warning signal that the Night Vision System is not cooled. Seeing amber means you should halt use and follow the cooling procedure in the manual—check that the cooling system is functioning, allow time for cooldown, and apply any appropriate cooling or fan checks before proceeding.

A green indicator usually means the system is properly cooled and operating normally. A red indicator signals a fault or an overheating condition beyond safe limits that requires maintenance or a shutdown. A blue indicator isn’t used to signify cooling status in this setup, so it doesn’t guide cooling decisions. In practice, amber is your cue to address cooling before continuing operation.