Spoilers

Question 1

Which spoilers act as speed brakes and which spoilers act as roll spoilers?

Answer 1

Speed brakes are spoilers 2,3 and 4. Roll spoilers are 2, 3, 4 and 5.

Question 2

At what speed will the ground spoilers deploy?

Answer 2

In an RTO: 72kts

Question 3

Explain phased lift dumping and its purpose?

Answer 3

Partial spoiler deployment when 1 wheel touches. They then fully extend when both wheels touch. Allows for a smoother touch down.

Question 4

What is the effect on VLS when operating the speed brakes?

Answer 4

It increases VLS

Question 5

What is the effect of speed brakes when operating at high Mach numbers and approximately how long does it take to go from full extension to fully retracted?

Answer 5

Causes a pitch up effect but the AP compensates for it in normal law. It reduces the buffet margin.
Very effective but takes ages to retract them - I think 20s