What occurs when the CAS switch is pressed once on the CCP?

When the CAS switch is pressed once on the Central Control Panel (CCP), the system hides the caution, advisory, and status messages. This functionality allows the crew to clear the display of non-critical alerts and focus on essential information, especially during high-workload situations or when these messages are not relevant to the current operational context. The key point is that pressing the CAS switch provides a way to minimize distractions without losing the ability to access those messages later, as they can be shown again or retrieved if needed.

Other options may discuss different functions performed by the aircraft systems but are not the direct effect of pressing the CAS switch once. For example, generating a new status message would not occur with a single press, as this action is intended to control the display rather than create new alerts. Additionally, activating the warning system and resetting all warning lights have distinct operational procedures and are not directly linked to the CAS switch's immediate effect.