What does a yellow arc on an instrument indicate?

What does a yellow arc on an instrument indicate?

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

Answer: (C)

A yellow arc on the airspeed indicator marks the caution range. It spans from the maximum structural cruising speed up to the never-exceed speed. This band means you may operate in it, but only in smooth air and with careful handling—avoid abrupt maneuvers or gusty conditions, because your structural margins are reduced. If conditions require, you’d typically keep the airplane in the green (normal) range and avoid staying in the yellow arc for extended periods. This is why the yellow arc is described as a caution or limited flight operations range.

A yellow arc on the airspeed indicator marks the caution range. It spans from the maximum structural cruising speed up to the never-exceed speed. This band means you may operate in it, but only in smooth air and with careful handling—avoid abrupt maneuvers or gusty conditions, because your structural margins are reduced. If conditions require, you’d typically keep the airplane in the green (normal) range and avoid staying in the yellow arc for extended periods. This is why the yellow arc is described as a caution or limited flight operations range.