When the landing gear is down, in which scenario will the green light not illuminate?

The situation described focuses on the conditions that affect the illumination of the green light that indicates the landing gear is down. When the landing gear is down, the proper functioning of the system requires that specific electrical conditions are met for the light to illuminate.

In the case where wire number 6 is open, the circuit is not complete. An open wire creates a break in the path through which electrical current would flow. This interruption means that the electrical signal required to illuminate the green light does not reach it. Therefore, the light will not turn on even if the landing gear is properly positioned down and functioning correctly. This is the reason open wiring directly impacts the status indicator, leading to the green light not illuminating.

Other scenarios like a shorted wire or disconnected wires can create different faults, but fundamentally, the open circuit condition caused by a break in wire number 6 effectively prevents the circuit from completing and thus the light remains off.