Comm/Nav

Question 1

What is the function of the EMER/NORM switch on the Audio Control Panel?

Answer 1

The onside headset is directly connected to its VHF and NAV and that ACP is then inactive (First Officer: VHF #2, and NAV #2)

Question 2

What happens when the EMER switchlight is pressed on the Interphone Control Unit?

Answer 2

A red light flashes on the mid-cabin overhead exit sign and at the FA’s handset cradle, the amber EMG light flashes. The EMER switchlight flashes on the ICU, and the high/low chime is heard

Question 3

What are the locations of the Service Interphone Panels that allow maintenance personnel to talk to the cockpit crew?

Answer 3

1. Avionics Bay
2. Aft Equipment Bay
3. External Service Panel
4. The Refuel/Defuel Control Panel

Question 4

How can cross-side tuning be regained after an RTU failure?

Answer 4

Pressing the RTU INHIBIT switch associated with the failed RTU and then selecting the 1 / 2 key

Question 5

What is the function of the FMS TUNE INHIBIT switch?

Answer 5

It is used to prevent the FMS from controlling the radios