Control Speeds

Question 1

What is Vmo/Mmo?

Answer 1

Speeds that may not be deliberately exceeded

Question 2

What is Vfe?

Answer 2

The established speed so that flap speed is not exceeded

Question 3

What is Vlo/Vle?

Answer 3

Vlo - speed not to exceed when extending or retracting the landing gear

Vle - speed not to exceed when the landing gear is extended

Question 4

What is Vmcg? what are the limitations of Vmcg?

Answer 4

• The minimum control speed on the ground
• The CAS at the t/o run when critical engine inop, is possible to maintain control with the primary controls
• lateral deviation limit of 30ft on the runway (less deviation when a/c is travelling faster and vice versa)

Question 5

What is Vmca? what are the limitations of Vmca?

Answer 5

• The minimum control speed in the air
• The CAS at when critical engine inop, is possible to maintain control and straight flight with an AoB not more than 5 degrees.
• Heading change limit of 20 degrees.

Question 6

What is Vmcl?

Answer 6

• The minimum control speed on approach/landing
• considered at aircraft’s most critical config
• considered at it’s most unfavorable weight/ go around thrust

Question 7

What is Vmu?

Answer 7

• Minimum unstick speed
• CAS at which the a/c can safely lift off the ground
• Vmu (n) is for all engines operational
• Vmu (n-1) is for 1 engine inoperative

Question 8

what are the effects of Vmu on long and short aircraft?

Answer 8

• a short aircraft will stall

- a long aircraft will tail strike

Question 9

What is Vs1g?

Answer 9

• speed at which CLmax is reached
• The stall speed at “1G”
• Is the same thing as Vsr
• used on fly-by-wire aircraft