What must an aircraft do during the base leg flight path before final approach?

During the base leg flight path, an aircraft typically executes a 90-degree turn to transition from the base leg to the final approach. This maneuver is essential for aligning the aircraft with the runway for landing. The base leg is flown parallel to the runway but off to one side, and the turn at this stage helps the pilot position the aircraft correctly for landing.

Executing this turn allows the pilot to manage the approach airspeed and descent rate effectively while ensuring adequate spacing from other aircraft and obstacles. The turn is integral to the landing sequence, promoting a safe and controlled approach at the right altitude and orientation for a successful landing.

Turning at a 90-degree angle is standard procedure during this phase, making it a critical skill for pilots to master in their training. This is why the choice indicating a 90-degree turn from the base leg aligns with proper aircraft operation during approach procedures.