Which systems are powered by inverter power?

Which systems are powered by inverter power?

• A. Flight data recorder
• B. Primary flight display
• C. TCAS II, EGPWS/Windshear
• D. Radio navigation receivers

Answer: (C)

Inverters provide AC power (typically 115V, 400 Hz) from the aircraft’s DC electrical system for avionics that are designed to run on AC rather than DC. TCAS II and EGPWS/Windshear are example systems that require this AC power to operate their processors and displays, so they are fed from the inverter power source. The other items—flight data recorder, primary flight display, and radio navigation receivers—are typically powered from the DC bus or have dedicated DC power supplies, so they don’t rely on inverter power in normal operation.

Inverters provide AC power (typically 115V, 400 Hz) from the aircraft’s DC electrical system for avionics that are designed to run on AC rather than DC. TCAS II and EGPWS/Windshear are example systems that require this AC power to operate their processors and displays, so they are fed from the inverter power source. The other items—flight data recorder, primary flight display, and radio navigation receivers—are typically powered from the DC bus or have dedicated DC power supplies, so they don’t rely on inverter power in normal operation.