As a pilot, you must have a clear perspective on your aircraft's capabilities. It is essential for you to know, for instance, how well, or how badly, your aircraft performs in the various phases of flight. How much runway will you use for take-off and landing, how well will the aircraft climb, how far it can fly, how long can it remain airborne? These are questions you need to know the answer to for every aircraft you fly. You will find the answers to these questions through your study of the theoretical knowledge subject 'Aircraft Performance'. Fully appreciating your aircraft's performance and what controls that performance is vital for safe and efficient flying operations.