The transformer rectifier providing emergency DC power to Battery Bus is powered from which AC system?

The transformer rectifier providing emergency DC power to Battery Bus is powered from which AC system?

• A. External DC power
• B. Battery
• C. No. 1 AC System
• D. No. 2 AC System

Answer: (D)

In this helicopter’s electrical setup, there are two AC power sources driven by two generators, labeled No.1 and No.2. The transformer-rectifier that provides emergency DC to the Battery Bus is fed from the No.2 AC system. This design gives a dedicated, independent DC source for essential batteries and buses during abnormal conditions, so even if the No.1 AC system isn’t available, the Battery Bus can still receive the necessary DC power. External DC power isn’t used for this emergency path, and the rectification process requires an AC source, which in this case comes from No.2.

In this helicopter’s electrical setup, there are two AC power sources driven by two generators, labeled No.1 and No.2. The transformer-rectifier that provides emergency DC to the Battery Bus is fed from the No.2 AC system. This design gives a dedicated, independent DC source for essential batteries and buses during abnormal conditions, so even if the No.1 AC system isn’t available, the Battery Bus can still receive the necessary DC power. External DC power isn’t used for this emergency path, and the rectification process requires an AC source, which in this case comes from No.2.