What conditions must be met to be number one for departure in the landing pattern?

To be number one for departure in the landing pattern, the correct conditions are that the flaps must be up and the aircraft that is upwind has initiated the crosswind turn. This is essential because it indicates that the aircraft is no longer in the landing phase and has effectively cleared the immediate area for the next aircraft to depart.

Having the flaps up is important as it reflects the aircraft's configuration for takeoff and departure, ensuring optimal performance and handling characteristics are in place for climb out. The initiation of the crosswind turn by the upwind aircraft confirms that it is making progress away from the runway, allowing the next aircraft to safely depart without conflict.

In the context of this question, other options do not reflect the appropriate state for departure. For instance, having gear raised and flaps down would not align with standard operating procedures, since flaps should be configured for a safe takeoff and departure scenario. Understanding these configurations helps maintain safety and efficiency in the landing pattern.