What electrical output is commonly provided by an aircraft APU during ground operations?

What electrical output is commonly provided by an aircraft APU during ground operations?

• A. AC electrical power (115 VAC, 400 Hz) to aircraft systems, and sometimes DC power via an integrated converter as required
• B. DC power via an integrated converter
• C. No electrical output on the ground
• D. 230 VAC at 60 Hz

Answer: (A)

During ground operations, the aircraft APU is used to supply electrical power to the aircraft systems. Its primary output is AC power at 115 VAC, 400 Hz, which powers avionics, lighting, environmental controls, and other onboard systems while the engines aren’t running. If a DC load is needed, the APU can provide DC power through an integrated converter that derives it from the AC output. The 230 VAC at 60 Hz option isn’t the standard on-board electrical system for most aircraft, and the APU is specifically used to provide power on the ground rather than none at all.

During ground operations, the aircraft APU is used to supply electrical power to the aircraft systems. Its primary output is AC power at 115 VAC, 400 Hz, which powers avionics, lighting, environmental controls, and other onboard systems while the engines aren’t running. If a DC load is needed, the APU can provide DC power through an integrated converter that derives it from the AC output. The 230 VAC at 60 Hz option isn’t the standard on-board electrical system for most aircraft, and the APU is specifically used to provide power on the ground rather than none at all.