How are the avionics cooled?

• A. Two Avionics Cooling Fans; One Operates on the Ground, One Operates in the Air
• B. Two Avionics Cooling Fans; Both Operate in Flight
• C. One Avionics Cooling Fan; Ground Operation Only
• D. Three Avionics Cooling Fans; All Operate in Flight

Answer: (A)

Avionics cooling relies on a pair of fans designed to provide cooling under all operating conditions. One fan operates when the aircraft is on the ground, ensuring there’s airflow to the avionics bay even with little ram air available. The other fan takes over in flight, using the ram air and the aircraft’s ventilation paths to keep the electronics within safe temperatures during cruise and higher-speed phases. This arrangement gives redundancy and consistent cooling whether the aircraft is parked, taxiing, or flying fast through the air. Having all cooling occur only in flight or only on the ground would leave the avionics vulnerable in the other scenario, and adding more than two fans isn’t how the system is configured.