What does a yellow arc on an aircraft instrument indicate?

What does a yellow arc on an aircraft instrument indicate?

• A. Normal operating range
• B. Immediate action required
• C. Caution or limited flight operations range
• D. Redline

Answer: (C)

On the airspeed indicator, colors map the pilot’s operating limits. The yellow arc marks the caution range, which lies between the end of the normal operating range (green arc) and the redline (never-exceed speed). Speeds in this band should only be flown in smooth air and with careful handling; abrupt maneuvers or flying near the redline should be avoided. In short, the yellow arc indicates a caution or limited flight operations range.

On the airspeed indicator, colors map the pilot’s operating limits. The yellow arc marks the caution range, which lies between the end of the normal operating range (green arc) and the redline (never-exceed speed). Speeds in this band should only be flown in smooth air and with careful handling; abrupt maneuvers or flying near the redline should be avoided. In short, the yellow arc indicates a caution or limited flight operations range.