V1 (21-05-18)

Question 1

What is the value of V₁ based on?

Answer 1

Spare runway

Runway surface condition

Weather in climb out

Terrain/obstacles on climb out

Question 2

What is V_go?

Answer 2

The first speed at which you could continue with an engine failure.

Question 3

What is V_stop?

Answer 3

The last speed at which you can stop with the remaining runway.

Question 4

In relation to V_go and V_stop, where is the range of possible V₁s?

Answer 4

Between them

Question 5

What happens to V_go and V_stop with an increase in mass?

Answer 5

V_go gets faster

V_stop gets slower

therefore the range of possible V₁s narrows

Question 6

What is it called when increasing mass causes V_go=V_stop?

Answer 6

We find a balanced V₁

this occurs at RLTOM

Question 7

If a TO situation callls for a pilot to be “go minded” (for example the runway dropping off into the sea) in the range of possble V₁s where would we want out selected V₁ to be?

Answer 7

Slower/closer to V_go so that we are committed to going closer to the beginning of the TO run.

Question 8

If a TO situation callls for a pilot to be “stop minded” (for example the runway having high obstacles just after it) in the range of possble V1s where would we want out selected V1 to be?

Answer 8

Faster/closer to V_stop so that we are committed to stopping in the case off an engine failure for more of the TO run.

Question 9

Out of V₁, V_go and V_stop, which are shown to the pilot on the speed tape?

Answer 9

Only V₁ so that the pilot can’t make subjective decisions based on knowing where the other speeds are.

Question 10

What is the effect of increasing V₁ if the pilot is limited by TODA?

Answer 10

TODR reduces

RLTOM increases

Question 11

What is the effect of increasing V₁ if the pilot is limited by ASDA?

Answer 11

The ASDR increases

The RLTOM reduces

Question 12

When considering the effects of variables on V₁, which variables make us consider effects on V_go?

Answer 12

Mass, density and TO flap

(A/C config & air properties)

Question 13

When considering the effects of variables on V1, which variables make us consider effects on V_stop?

Answer 13

Upslope, downslope, headwind component, tailwind component and a wet runway.

Question 14

What is the effect on V₁ of an increase in:

Mass; density; flap; upslope; downslope; headwind; tailwind and wetness.

Answer 14

Figure:

Question 15

What does the V₁ vs TOM look like and what features are on it?

Answer 15

Figure:

Question 16

Why is there a reduction in screen height on a wet runway?

Answer 16

So that operators can avoid mass penalties.