What is the primary purpose of the Attitude Indicator?

The primary purpose of the Attitude Indicator is to indicate aircraft orientation. The instrument visually portrays the aircraft's position relative to the horizon, showing whether the wings are level, climbing, descending, or turning. This is crucial for piloting, especially in situations where visual references outside the aircraft are limited, such as in clouds or at night.

By displaying the aircraft's pitch and roll, the Attitude Indicator helps pilots maintain control and perform maneuvers safely. A proper understanding of the aircraft's orientation is essential for effective navigation and maintaining safe flight parameters.

The other options describe functions performed by different instruments. For example, altitude measurement is done by the Altimeter, speed information is provided by the Airspeed Indicator, and engine performance is monitored by various engine instruments. Each of these instruments has its own specialized role within the cockpit, but none directly indicate the aircraft's orientation as the Attitude Indicator does.