The green landing gear light will fail to illuminate when the landing gear is down if there is an open in which wire?

The green landing gear light will fail to illuminate when the landing gear is down if there is an open in which wire?

• A. No. 4
• B. No. 2
• C. No. 5
• D. No. 6

Answer: (D)

A lamp needs a complete path for current to flow. When the landing gear is down, the switch completes the circuit to the green landing gear light, allowing current to flow from the power source through the light and back to ground. If the feed wire for that green indicator is open, the path is broken and no current can reach the lamp, so the green light won’t illuminate even though the gear is down. The other wires feed other indicators or parts of the circuit; opening those would not stop the green light from lighting because its path is separate.

A lamp needs a complete path for current to flow. When the landing gear is down, the switch completes the circuit to the green landing gear light, allowing current to flow from the power source through the light and back to ground. If the feed wire for that green indicator is open, the path is broken and no current can reach the lamp, so the green light won’t illuminate even though the gear is down. The other wires feed other indicators or parts of the circuit; opening those would not stop the green light from lighting because its path is separate.