Which components provide DC power to the SME DC busses?

• A. Transformer Rectifier 5 and 6
• B. ESS AC bus
• C. Cobham Aviator 700
• D. EGI 3

Answer: (A)

Providing DC power to the SME DC busses comes from DC sources generated by transformer-rectifier units. These assemblies take AC power from the AC power system, rectify it to DC, and regulate it to the voltage the SME DC busses require. That makes transformer rectifier units the actual source for the DC busses.

The ESS AC bus delivers AC power, not DC, so it cannot feed the SME DC busses directly. The Cobham Aviator 700 is a system component that uses power rather than supplying DC power to the busses. The EGI 3 is an instrument that consumes power from the DC busses, not a source of DC power themselves.