Final answer:
The aircraft must be tracked and a fire control solution determined during the engagement phase.
Step-by-step explanation:
In aviation, tracking the aircraft and determining a fire control solution is crucial during the engagement phase. This phase refers to the stage when the aircraft is actively involved in combat or attack operations. It involves continuously monitoring the aircraft's movement, position, and status to ensure effective fire control.
For example, in air-to-air combat scenarios, tracking the enemy aircraft's position and calculating the firing solution (considering factors like distance, speed, and bullet drop) is essential to successfully engage and neutralize the threat.