airspeed indicator markings

Question 1

white arc

Answer 1

• flaps operating range
• starts at Vso (stall speed in landing configuration); ends at Vfe (max flap extension speed)

Question 2

green arc

Answer 2

• normal operating range
• stars at Vs1 (stall speed in specific configuration); ends at Vno (max structural cruise speed)

Question 3

yellow arc

Answer 3

caution range
fly only in smooth air and only with cation

Question 4

red line

Answer 4

Vne ( never exceed speed)