What is the role of standby instruments during air data anomalies?

• A. They provide independent readings to verify or cross-check primary instruments.
• B. They are decorative.
• C. They provide additional engine readings.
• D. They control autopilot.

Answer: (A)

Standby instruments are a backup reference that remains independent from the air data system, so they can continue to provide usable information when the primary sensors are unreliable. They’re designed to stay powered and, in many airplanes, connected to an alternate sensing or power source, giving readings for attitude, airspeed, and altitude that the pilot can rely on while diagnosing the air data anomaly. The pilot uses these readings to verify or cross-check what the primary instruments show, helping identify which data are trustworthy and maintain safe control of the aircraft.

They aren’t decorative, they don’t provide engine performance information, and they don’t drive the autopilot; their purpose is to serve as a trustworthy backup reference when the main air data system is compromised.