What is the main function of flight instruments and controls?

The main function of flight instruments and controls is to provide crucial information about the aircraft's performance. Flight instruments display data related to various parameters such as altitude, airspeed, heading, and attitude, which are essential for the safe and effective operation of the aircraft. These instruments help pilots make informed decisions while flying, enabling them to maintain control of the aircraft, navigate, and respond to environmental changes or emergency situations.

In addition to displaying performance information, controls allow the pilot to manage the aircraft's operations, including throttle adjustments, control surface movements, and navigation inputs. Therefore, the integration of instruments and controls is vital for ensuring that pilots have the necessary information and tools at their disposal to operate the aircraft safely.

The other options focus on structural components or functions unrelated to the critical operational role that instruments and controls play in flight. The reference to landing gear, engines, and structural connections indicates functions specific to aircraft design rather than the primary purpose of aiding in the flight operation itself.