Landing Distance Available (LDA)

Landing Distance Available (LDA) is the length of runway declared available and suitable for the ground run of an aeroplane landing. LDA is declared by the aerodrome operator and published in the AIP for certified aerodromes. Landing Distance Required (LDR) is measured from a height of 50 ft above the landing threshold at a speed of 1.3 VSO to a complete stop with maximum braking applied.

Key Points

• •LDA is the runway distance available for the landing ground run.
• •LDA is published in AIP/ERSA for certified aerodromes.
• •Landing Distance Required (LDR) includes the airborne segment from 50 ft above the threshold plus the ground roll.
• •LDR assumes maximum braking — actual landing distance may be longer without maximum braking applied.

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