17 Class A Take Off Theory

Question 1

Regarding a Class A AC, describe what BR is?

Answer 1

• BR: Brake release

- Start point of the AC take off

Question 2

Regarding a Class A AC, describe V1?

Answer 2

• V1: decision speed
• Speed at which the first action for an aborted take off must be made
• Beyond V1 the AC WILL take off

Question 3

Regarding a Class A AC, describe Vef?

Answer 3

• Vef: Velocity Engine Failure
• The speed at which an engine failure is assumed to take place
• Vef < V1 (min 1 sec before V1)

Question 4

Regarding a Class A AC, describe Vmcg?

Answer 4

• Vmcg: Velocity minimum control on the ground

- Vmcg <= Vef

Question 5

Regarding a Class A AC, describe Vr?

Answer 5

• Vr: Velocity Rotate

- Vr >= V1

Question 6

Regarding a Class A AC, describe Vlof?

Answer 6

• Vlof: Velocity Lift Off

- Vlof > Vr

Question 7

Regarding a Class A AC, describe V2?

Answer 7

• V2: Minimum speed the AC must be at 35ft (screen height)

- V2 > Vlof

Question 8

Regarding a Class A AC, describe Vmbe?

Answer 8

• Vmbe: Velocity maximum brake energy absorption
• Maximum velocity at which the brakes are still able to convert kinetic energy into heat energy
• Vmbe >= V1

Question 9

Regarding a Class A AC, describe Vmax tyre?

Answer 9

• Vmax tyre: Maximum velocity the tyres can handle

- Vmax tyre >= Vlof

Question 10

Regarding a Class A AC, in what order do the following speeds sit and how do they relate to each other:

• Vef
• Vr
• V1
• V2
• Vlof

Answer 10

Vef < V1 <= Vr < Vlof < V2

Question 11

Regarding a Class A AC, at what point on a graph is it considered to be a Balanced V1?

Answer 11

The point where ASD and TODn-1 cross

Question 12

Regarding a Class A AC, how do the following effect V1 and Vmbe:

• Upslope
• Tailwind

Answer 12

• V1 and Vmbe increase with an Upslope

- V1 and Vmbe decrease with a tailwind

Question 13

Regarding a Class A AC, in what order do the following speeds sit and how do they relate to each other:

• V1
• Vmbe
• Vmcg
• Vr

Answer 13

Vmcg < V1 <= Vmbe and Vr

Question 14

Regarding a Class A AC, if V1 is reduced what happens to:

• T/O distance
• ASD

Answer 14

• T/O distance increases

- ASD decreases

Question 15

Regarding a Class A AC, if the Stopway is increased what happens to:

• V1
• TOM

Answer 15

• V1 increased

- TOM increased

Question 16

Regarding a Class A AC, if the Clearway is increased what happens to:

• V1
• TOM

Answer 16

• V1 decreases

- TOM increases

Question 17

Regarding a Class A AC, in what conditions are the following likely to be limiting for Vr:

• Vmc
• Vmu

Answer 17

• In Hot and High Altitude conditions Vmu is most likely to be limiting
• In Cold and Low Altitude conditions Vmc is most likely to be limiting

Question 18

What is the Take Off Run from and to on a wet runway?

Answer 18

From brake released to 15ft screen height

Question 19

As contamination on a RW increases, what happens to:

• Mass decrement
• V1 decrement

Answer 19

• Mass decrement increases

- V1 decrement decreases

Question 20

For a balanced field, what can be said about the Field Limited Take-Off Mass?

Answer 20

There is only 1 defined V1 speed

Question 21

For a Class A AC, what is the effect of compacted snow on TODR and ASDR?

Answer 21

• TODR stays the same as compacted snow has no effect on acceleration
• ASDR increases

Question 22

What are the major considerations when establishing the tyre speed limit?

Answer 22

• Rotation rate

- Temperature