A solid green block on the EUFD indicates that....

• A. The CCP and CPG are both in emergency mode
• B. The selected radio is monitoring only
• C. The radio is currently transmitting
• D. Both crew stations have selected the same radio to IDM

Answer: (D)

A solid green block on the EUFD shows that both crew stations have selected the same radio for the IDM function, meaning the intercom/data path is synchronized and ready for use by both pilots. This shared selection is a normal, healthy configuration, so the green block indicates a correct setup rather than any fault. If the crew were in emergency mode, the indicator would typically change color or flash to signal the alert. If the radio were only being monitored, the EUFD would show a different status rather than a solid green block for a shared selection. If the radio were transmitting, you’d expect a transmit indicator on the radio itself rather than this shared green block.