What is the primary method used in attitude instrument flying to indicate performance and attitude?

In attitude instrument flying, the primary method used to indicate performance and attitude is through a combination of primary and supporting instruments. The primary instruments provide essential information for maintaining control of the aircraft, such as the attitude indicator, which shows the aircraft's orientation relative to the horizon. Supporting instruments, including the altimeter and airspeed indicator, offer additional data that helps pilots assess their performance and make necessary adjustments during flight.

The use of both primary and supporting instruments allows for a comprehensive understanding of the aircraft's state, which is critical in conditions where visual references are limited. This combination enables pilots to make informed decisions about their flight path and attitude, ensuring safe and effective operation of the aircraft.