FSX Aerial Firefighter Training Mission. The Aerial Firefighter training mission is for players to learn and practice aerial firefighter skills. The flying tests will help you learn the approach, speed, and height control skills needed to successfully drop mud bombs (retardant) on spot fires. Then you'll be able to practice mud bomb drops on a never-ending series of spot fires. Earn certification reward as an aerial firefighter by passing all three flying tests and by putting out 15 spot fires in less than 15 minutes. By Al Goodrich.