What is the standby battery voltage?

What is the standby battery voltage?

• A. 12 V
• B. 24 V
• C. 48 V
• D. 24 VDC

Answer: (D)

Standby power is a dedicated source that keeps essential flight instruments and basic avionics alive if the main electrical system fails. The standby battery is designed to provide power at 24 volts direct current (24 VDC), which matches the airplane’s standby power bus and is sufficient to run the critical loads for a short, safe period. A 12 V supply would generally be too small to support all the required loads for the necessary time, and 48 V would require a different system design not used for standby on this aircraft. The explicit DC specification is important because it confirms the type of current powering those essential systems.

Standby power is a dedicated source that keeps essential flight instruments and basic avionics alive if the main electrical system fails. The standby battery is designed to provide power at 24 volts direct current (24 VDC), which matches the airplane’s standby power bus and is sufficient to run the critical loads for a short, safe period. A 12 V supply would generally be too small to support all the required loads for the necessary time, and 48 V would require a different system design not used for standby on this aircraft. The explicit DC specification is important because it confirms the type of current powering those essential systems.