What is the purpose of the Standby Attitude Indicator?

The purpose of the Standby Attitude Indicator is to provide backup attitude information. In aviation, the attitude indicator is a critical instrument that displays the aircraft's orientation relative to the horizon, indicating whether the wings are level or if the aircraft is climbing, descending, or turning.

Having a standby attitude indicator serves as a crucial safety feature, ensuring that pilots have access to essential flight information even if the primary attitude indicator fails. This redundancy is vital, as accurate attitude data is key to maintaining control of the aircraft during different flying conditions, particularly in low visibility situations.

In contrast, the other options focus on different functions, such as monitoring engine performance, measuring airspeed and altitude, or displaying navigation data, which are not the primary roles of the Standby Attitude Indicator.