Which color light illuminates the UAC fitting when air pressure is low?

Which color light illuminates the UAC fitting when air pressure is low?

• A. Blue
• B. Green
• C. White
• D. Red

Answer: (C)

The indicator on the UAC fitting uses color signaling to show air status, and white is used to flag low air pressure. When the cylinder is running low, a white light illuminates at the UAC so you can quickly recognize you’re nearing the end of the air supply and act accordingly, even in smoky or low-visibility conditions. Blue or green typically indicate normal or ready status, while red is reserved for urgent or critical alarms. So the white signal specifically communicates “low air,” prompting a timely response.

The indicator on the UAC fitting uses color signaling to show air status, and white is used to flag low air pressure. When the cylinder is running low, a white light illuminates at the UAC so you can quickly recognize you’re nearing the end of the air supply and act accordingly, even in smoky or low-visibility conditions. Blue or green typically indicate normal or ready status, while red is reserved for urgent or critical alarms. So the white signal specifically communicates “low air,” prompting a timely response.