Which of the following is NOT listed as a fault associated with electrical system malfunctions?

• A. Open circuit
• B. Shorted circuit
• C. Ground fault
• D. Low power

Answer: (C)

Understanding how faults manifest in an aircraft electrical system and how they’re categorized helps you see why this set excludes one option. An open circuit is a break in the conductor that stops current flow completely. A shorted circuit creates a path of very low resistance, causing excessive current. Both are classic faults that directly affect the circuit path and power delivery.

Ground fault, on the other hand, is a current leakage path to the chassis or earth rather than through the intended load. It’s a different kind of fault—more about insulation failures and unintended grounding—often treated as a leakage or protection issue rather than a straightforward fault in the circuit’s normal path. In the context of this list, ground fault isn’t counted among the typical circuit-path malfunctions, so it’s not listed.

So the option describing a ground fault stands out as the one not listed, which is why it’s the correct choice in this question.