On the ground, air exhausted from the cooling displays and the avionics area exits the aircraft through ___?

• A. Through the tailcone exhaust.
• B. The ground valve vents air overboard through the bulkhead.
• C. Into the cockpit ventilation system.
• D. It is recirculated to the cabin.

Answer: (B)

On the ground, the air used to cool the displays and avionics is vented directly outside through a dedicated ground valve that dumps overboard via a bulkhead outlet. This keeps heat out of the cabin and cockpit and avoids recirculating warm avionics air back into occupied areas. The other paths aren’t suitable here: the tailcone exhaust is tied to cabin outflow in flight, not to avionics cooling on the ground; sending it into the cockpit ventilation system would introduce heat and contaminants into the cockpit; and recirculating it to the cabin would simply reuse hot air instead of removing it.