PerformanceTake-off and Landing

Landing Distance Required (LDR)

Landing Distance Required (LDR) is the total distance required to safely land an aircraft, calculated from a specified height above the threshold to the point where the aircraft comes to a complete stop. This calculation must account for factoring and operational variables such as wind, slope, and surface conditions.

Key Points

  • •LDR must never exceed the published Landing Distance Available (LDA).
  • •LDR is increased by tailwinds, downhill slopes, high density altitude, and wet or contaminated surfaces.
  • •LDR is derived using the aircraft's flight manual or approved performance charts.

Exam Relevance

Essential for determining aerodrome suitability and ensuring regulatory safety margins are met for landing operations.

Related Terms

take off distance requiredlanding distance available

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Landing Distance Required (LDR) | The Pilot Exam