Communications

Question 1

What are the components that make up the communications system?

Answer 1

• VHF radio
• HF radio
• SATCOM
• Interphone

Question 2

What other components make up the comm system?

Answer 2

• CVR
• SELCAL
• Crew Alerting System
• Radio Communication System
• Interphone Communication System
• Data Communication System

Question 3

What primarily controls the communications system?

Answer 3

• Audio control panels (ACP)
• Radio tuning panels
• Comm pages of the CDU
• Comm pages of the MFD

Question 4

How many transmitters switches on the ACP can be selected at a time?

Answer 4

1

Question 5

What happens when the crew oxygen mask stowage doors are opened?

Answer 5

Oxygen mask microphone is enabled and the boom microphone is disabled.

Question 6

How is the boom microphone enabled at the completion of using the oxygen mask?

Answer 6

• Close the left oxygen mask stowage door
• Push the RESET/TEST switch
• Ensure OXY ON flag is out of view

Question 7

If the CA or FO’s ACP fails how can comms be restored?

Answer 7

The observer ACP can be used as a backup by selecting CAPT or F/O on the OBS AUDIO selector.

Question 8

The radio communications system consist of?

Answer 8

• VHF radios
• HF radios
• SELCAL

Question 9

What is different about VHF L from VHF R and VHF C?

Answer 9

VHF L is configured for voice only and can be used on standby battery power.

Question 10

What happens if VHF or HF radio has a stuck mic for more than 30 seconds?

Answer 10

The EICAS displays a RADIO TRANSMIT advisory message

Question 11

On the ground with both engines shut down, what happens when any VHF radio is transmitting for more than 35 seconds?

Answer 11

• The radio is automatically disabled
• An intermittent tone can be heard through the audio system for that radio
• Dashes appear on the tuning panel frequency window

Question 12

What are the four parts to the ICS?

Answer 12

• Flight interphone system
• Service interphone system
• Cabin interphone system
• Passenger address system

Question 13

Why should the SERV INTPH be set to OFF during flight?

Answer 13

To eliminate residual circuit noise on the cabin interphone.