11 / 20

What is the consequence of using a dry V1 on a wet runway for the Accelerate Stop Distance ASD?

  • A
    decreases due to the greater friction drag on a wet runway.
  • B
    increases, and the runway becomes unbalanced.
  • C
    remains the same if thrust reversers are used.
  • D
    increases, and the runway remains balanced.
When compared to a dry runway, V1 for a wet runway decreases. Therefore, using a dry V1 (higher speed) will result in an increased Accelerate-Stop distance (ASD) because of the increased distance to stop resulting from the reduced runway coefficient of braking friction when compared to a dry runway.
For a Balanced Field take-off, Take-Off distance Required (TODR) must be equal to the Accelerate-Stop distance Required (ASDR). In this case, ASDR is increased, therefore, we will have a situation where TODR < ASDR => Unbalanced Condition.
SUMMARY;
  • If TOD = ASD, V1 = BALANCED, Balanced condition.
  • If TOD > ASD, V1 < V1 BALANCED, Unbalanced condition.
    Clearway, no stopway = higher mass and lower V1 speed
  • If TOD < ASD, V1 > V1 BALANCED, Unbalanced condition.
    Stopway, no clearway = higher mass and higher V1 speed.

Your Notes (not visible to others)



This question has appeared on the real examination, you can find the related countries below.

  • United Kingdom
    50
  • Austro Control
    29
  • Spain
    23
  • Poland
    12
  • Greece
    9
  • Sweden
    8
  • Germany
    5
  • Switzerland
    5
  • Czech Republic
    4
  • Ireland
    4
  • Slovakia
    4
  • Hungary
    3
  • Azerbaijan
    2
  • Bulgaria
    2
  • Denmark
    2
  • Finland
    2
  • Iceland
    2
  • Latvia
    2
  • Luxembourg
    2
  • Malta
    2
  • Norway
    2
  • Slovenia
    2
  • Italy
    1
  • Netherlands
    1
  • Portugal
    1
  • Romania
    1
  • Serbia
    1
  • Thailand
    1
Keyboard Shortcut Use Keyboard Shortcuts