What is the term for a reflection of aircraft pitch-and-bank attitude by instruments other than the attitude indicator?

The term "Indirect Indication" refers to the ability of certain instruments to provide information about the aircraft's pitch-and-bank attitude, even though they do not directly show this information like the attitude indicator does. Instruments such as the altimeter, vertical speed indicator (VSI), and heading indicator can provide meaningful clues about the aircraft's attitude by reflecting changes in altitude, rate of climb or descent, and changes in heading.

For instance, a climb or descent indicated by the altimeter and the VSI can suggest pitch attitude, while a change in heading can imply bank angle. Understanding how these instruments reflect the aircraft’s performance is crucial for pilots, especially during instrument flying when visual references are limited. This indirect indication is essential in verifying or cross-checking the data shown by the primary instrument, the attitude indicator, thus improving situational awareness and safety in flight.

Understanding the function of each instrument helps pilots maintain control and situational awareness even when they cannot rely on direct visual cues, reinforcing why this term is used in this context.