What happens if the 1/2 button is selected on the display control panel?

When the 1/2 button is selected on the display control panel, it causes the Multi-Function Display (MFD) to reflect the cross-side radios. This feature allows pilots to monitor and interact with the radio systems that are located on the opposite side of the cockpit, enhancing situational awareness and allowing for better management of communications with air traffic control and other entities. It is particularly useful during phases of flight where rapid switching between radios may be required, ensuring that critical information is readily available.

The other options do not accurately represent the functionality provided when the 1/2 button is pressed. For instance, displaying engine parameters or flight plan information would typically be controlled by different settings or buttons designed specifically for those functions. Similarly, accessing weather radar data is a separate action that the 1/2 button does not initiate. The function of reflecting the cross-side radios is a specific feature designed to optimize communication and operational efficiency in flight.