What happens when the LG PULL handle is raised in flight?

When the LG PULL handle is raised during flight, it triggers a specific sequence of actions related to the landing gear system. The mechanism involves releasing the uplocks that secure the landing gears in the stowed position, allowing the landing gear to deploy. Simultaneously, the runaround and dump valve opens, which is essential for the hydraulic system that assists in lowering the landing gear. Additionally, the auxiliary actuators become pressurized from the right hydraulic system to facilitate the movement of the landing gear. This ensures that the landing gear is effectively lowered and locked into place as the aircraft prepares for landing, adhering to standard operational protocols for flight safety.

The other options do not accurately describe the function of the LG PULL handle. For instance, deploying landing gear or extending flaps involves separate systems that do not activate merely by raising the LG PULL handle. Automatic landing initiation is a complex procedure involving specific autopilot settings and conditions, not triggered by this handle's position.