Avionics Division Block VI Practice Test

Redundancy in attitude information is achieved by a standby attitude indicator that uses an independent source. If the primary attitude indicator fails, the standby instrument continues to display the aircraft’s attitude using its own gyro or source that is not tied to the failed unit, so the crew still has reliable attitude information. In addition, many standby indicators provide a warning or annunciation when they detect a failure in the primary AI, alerting the crew to rely on the standby and investigate the primary instrument.

This is why the best answer is that the standby indicator keeps providing attitude information from an independent source and may include a warning. It isn’t simply halted or mirrored, and it doesn’t typically require a crew reset to resume indicating.