Landing Performance Notes

Question 1

What two components do actual landing distance involved?

Answer 1

• Air component

- Ground component

Question 2

What operational factors affect landing distance?

Answer 2

• Weight
• Wind
• Density altitude
• Runway slope and condition

Question 3

Are there generally safety factors applied to PC-21 performance data?

Answer 3

• No

- This is applied in the SIs

Question 4

How does a 10% increase in gross weight at landing change the landing speed and distance?

Answer 4

5% increase in landing speed

10% increase in landing distance

Question 5

What are the two types of hydroplaning?

Answer 5

1) Dynamic hydroplaning - when a wedge of water infront of the wheel lifts it off the runway
2) Viscous hydroplaning - oil of accumulated rubber combines with water on a runway

Question 6

What is the hydroplaning speeds for rotating and non-rotating tyres?

Answer 6

1) 7.7 times the square root of the tyre pressure = hydroplaning speed for a non-rotating tyre
2) 9 times the square root tyre pressure for a rotating tyre