What indicators comprise the standby instrument system and how do you use them during primary instrument failure?

• A. Standby attitude, airspeed, and altitude indicators; used when primary instruments fail to provide essential attitude and speed information.
• B. Standby indicators include weather radar display.
• C. Standby indicators are navigation data only.
• D. Standby indicators show engine parameters.

Answer: (A)

In a primary instrument failure, you rely on the standby instrument system to keep you oriented and safe. This system consists of three indicators: a standby attitude indicator that shows the artificial horizon (pitch and bank), a standby airspeed indicator for your current speed, and a standby altimeter for altitude. These instruments are designed to operate independently from the main displays, often with a separate power source, so they remain available when the primary cockpit instruments aren’t. Use the standby attitude indicator to maintain level wings and appropriate pitch, the standby airspeed indicator to stay within safe speed limits, and the standby altimeter to hold your assigned altitude. They provide essential flight reference during troubleshooting or restoration of the main instruments. The weather radar, navigation data, and engine parameters are not part of the standby set.