Final answer:
In aviation, the landing distance required refers to the length of the runway that a turbojet aircraft needs to come to a complete stop during landing. The available landing distance is the length of the runway available for the aircraft to land. The turbojet aircraft in a 705 operation may not be dispatched unless the landing distance required at the destination or alternate is at most a certain fraction of the available landing distance.
Step-by-step explanation:
In aviation, the landing distance required refers to the length of the runway that a turbojet aircraft needs to come to a complete stop during landing. The available landing distance is the length of the runway available for the aircraft to land. According to the question, the turbojet aircraft in a 705 operation may not be dispatched unless the landing distance required at the destination or alternate is at most a certain fraction of the available landing distance.
For example, if the available landing distance is 5000 feet, the turbojet aircraft may be dispatched if the landing distance required at the destination or alternate is no more than, let's say, 0.8 (80%) of the available landing distance (which would be 4000 feet in this case).
Therefore, in this scenario, the answer to the question would be the fraction or percentage specified in the particular operation's regulations.