Which of the following describes ASDA?

The term ASDA stands for Accelerate-Stop Distance Available, which is a critical parameter in aviation, particularly for takeoff and landing operations. It refers to the distance available on the runway for a pilot to accelerate to a certain speed and then come to a complete stop in the event of an aborted takeoff. This measurement is essential for ensuring that the aircraft can safely stop before reaching the end of the runway if necessary.

Understanding ASDA is vital for pilots and operators to ensure safe operational practices, especially regarding runway lengths and aircraft performance. This knowledge helps in planning for various scenarios, including engine failures or other issues that may necessitate an early decision to abort a takeoff.

The other options do not accurately define ASDA. "Available take-off speed distance assessment" and "Altitude stop-distance assessment" do not align with the recognized definition and concept of ASDA. Similarly, "Airstop distance available on approach" does not accurately represent the term in a manner that is relevant to takeoff operations. Recognizing ASDA is therefore crucial for safe flight operations and compliance with regulations in Part 135 operations.