When engines are running at high power during maintenance runs, taxi or takeoffs, what should vehicles do?

• A. Remain well clear until run subsides or aircraft depart
• B. Approach closely for signals
• C. Stop elsewhere
• D. Follow at a distance of 50 feet

Answer: (A)

Engines running at high power create a powerful jet blast that can injure people, move or break objects, and push vehicles off their intended paths. The safest approach is to stay well clear of the aircraft until the power subsides or the aircraft has departed. This keeps you out of the blast zone and avoids interfering with the aircraft’s operation. Approaching closely for signals can put you directly in the danger zone and distract you from safety cues; stopping somewhere else may still place you in the blast path or in the way of ground movements; following at a fixed short distance isn’t a reliable safety measure since blast effects vary with power and conditions.