Which switch position allows conditioned air to cool the cockpit CRT displays?

• A. OFF
• B. ON
• C. Standby on the DSPLY/Avionics Fan Control Panel
• D. AUTO

Answer: (C)

Providing dedicated, conditioned airflow to cockpit displays is crucial for keeping the CRTs within safe operating temperatures. The Standby position on the DSPLY/Avionics Fan Control Panel ensures a ready supply of conditioned air to the cockpit displays, so cooling is maintained even when other systems aren’t actively demanding airflow.

If you set it to Off, the airflow to the displays is cut off, which risks overheating. Turning the fan on would supply air only when the system is actively commanded to cool, not guaranteeing continuous cooling for the displays. Auto relies on sensors to modulate cooling, which can allow temperature to rise before the system responds. Standby, by contrast, provides steady, conditioned cooling specifically for the cockpit CRT displays, making it the best choice.