What do the colors red, green, and yellow indicate on aircraft gauges?

What do the colors red, green, and yellow indicate on aircraft gauges?

• A. Red indicates a maximum range or limit, Green indicates a normal operating range, Yellow indicates a caution range.
• B. Red indicates a caution range, Green indicates a maximum range, Yellow indicates a normal range.
• C. Red indicates a normal range, Green indicates a caution range, Yellow indicates a maximum range.
• D. Red indicates a fault condition, Green indicates standby, Yellow indicates maintenance required.

Answer: (A)

Colors on aircraft gauges are a quick way to gauge safety and operating status. Green shows the normal operating range where conditions are safe for continuous operation. Red marks the redline or maximum limit you should not exceed; pushing into red can indicate dangerous or prohibited operation. Yellow indicates a caution range—it's a warning that you’re approaching the limit and should operate with extra care, often planning to return to the green range soon. In practice, you monitor the gauge and stay within green for normal flight, back off before reaching yellow, and avoid entering red unless an emergency or specified procedure allows it. This color coding helps pilots make fast, safe decisions with minimal thought required.

Colors on aircraft gauges are a quick way to gauge safety and operating status. Green shows the normal operating range where conditions are safe for continuous operation. Red marks the redline or maximum limit you should not exceed; pushing into red can indicate dangerous or prohibited operation. Yellow indicates a caution range—it's a warning that you’re approaching the limit and should operate with extra care, often planning to return to the green range soon. In practice, you monitor the gauge and stay within green for normal flight, back off before reaching yellow, and avoid entering red unless an emergency or specified procedure allows it. This color coding helps pilots make fast, safe decisions with minimal thought required.