The backup flight instrument attitude indicator receives inputs from its own gyro, ensuring attitude information is available even if the aircraft's main inertial reference unit fails. Is this statement true or false?

• A. True
• B. False
• C. Not sure
• D. N/A

Answer: (A)

The essential idea is redundancy in attitude sensing. The standby attitude indicator is meant to keep giving you a sky-horizon view even if the primary inertial reference system fails. It does this by using its own gyroscope, often powered separately from the main IRS. That independence means attitude information continues to be available when the aircraft’s main inertial system goes down. Different installations may use a vacuum-driven or an electric gyro for the backup, but the key point is that the standby indicator isn’t relying on the main IRS data to function. Therefore, the statement is true.