MC switch 1K-C106 is which relay?

MC switch 1K-C106 is which relay?

• A. Ground Power Relay (No. 27)
• B. Power Relay
• C. Grounding Relay
• D. Signal Relay

Answer: (A)

The MC switch 1K-C106 is linked to the Ground Power Relay, the device that connects an external ground power source to the mission computer’s power bus. Engaging this relay lets the system be powered from the ground for preflight checks and testing without using onboard power generation. This is distinct from a general Power Relay (which would switch main power to loads), a Grounding Relay (which handles establishing a ground reference rather than supplying power), or a Signal Relay (which switches control or data lines). So the switch in question is specifically for enabling external ground power.

The MC switch 1K-C106 is linked to the Ground Power Relay, the device that connects an external ground power source to the mission computer’s power bus. Engaging this relay lets the system be powered from the ground for preflight checks and testing without using onboard power generation. This is distinct from a general Power Relay (which would switch main power to loads), a Grounding Relay (which handles establishing a ground reference rather than supplying power), or a Signal Relay (which switches control or data lines). So the switch in question is specifically for enabling external ground power.