Definitions

Question 1

TORA

Answer 1

TORA (Take off Run Available)

TORA is defined as the length of runway suitable for takeoff run of an aircraft. If there is a displaced threshold, TORA is not equal to LDA (Landing Distance Available). On the other hand, TORA does not include the stopway or the clearway. TORA is 15% shorter than the whole runway length.

Question 2

TODA

Answer 2

Take off Distance Available

TODA is the length of runway plus any clearway if exists. In case that there is no clearway, TODA is same as TORA. TODA includes ground as well as air segments. In short, TODA = TORA + Clearway.

Question 3

ASDA

Answer 3

Accelerate-Stop Distance Available

ASDA is defined as the sum of LDA/TORA (as applicable) and Stopway. In case that the takeoff is aborted, the aircraft can be brought to a stop either on the runway or on the stopway ASDA must not be used as TORA because of the structure of the clearway area.

Question 4

LDA

Answer 4

Landing Distance Available

LDA is the portion of runway length declared available and suitable for landing of an aircraft. If there is a displaced threshold, LDA starts from the beginning of displaced threshold. Otherwise the beginning of the threshold is the beginning point of LDA.

Question 5

Runway

Answer 5

The area designated for the takeoff and the landing of an aircraft.

Question 6

Clearway

Answer 6

The part of runways located beyond the paved part that is free of all types of obstructive material.

Question 7

Stopway

Answer 7

The part that is used to slow down the aircraft in case of a cancelled takeoff.

Question 8

S-###

Answer 8

S is single wheel the number is the maximum weight

Eg: S-20 - Single Wheel - 20,000 lbs maximum weight
S-12.5 - Single Wheel - 12,500 Lbs maximum weight

Question 9

D-###

Answer 9

Dual Wheel Maximum Weight

Eg: D-85 Dual Wheel 85,000 Lbs maximum weight