What should be the vent direction for aircraft fuel wing tanks?

The correct answer emphasizes the safety protocols necessary when venting fuel tanks in aircraft. Venting to the opposite wing is designed to minimize the risk of fire or explosion caused by fuel vapors. In the event of a fuel leak, directing the vapors away from ignition sources is crucial. By venting to the opposite wing, any potential vapors are positioned further from the ongoing operational areas, thereby enhancing safety for ground personnel and equipment nearby.

Venting to other areas, such as the nearest terminal, downwards into the ground, or into the aircraft interior, could create hazardous situations. These alternatives increase the likelihood of fuel vapors igniting from sparks or other sources, posing significant dangers during both refueling operations and emergency situations. Thus, directing vapors away from populated or active areas contributes to a safer environment.