Communications - General

Introduction

The communication system includes:

 

The Communication Systems are controlled using the:

  • Control Display Unit (CDU) for controlling the data link (refer to ACARS)
  • Control Panel for controlling the data link (refer to ACARS)

Audio Control Panels

Audio Control Panel The Audio Control Panels (ACP) are used to manage the Radio and Interphone communication systems, and are installed at the Captain, First Officer and Flight Observer stations. Each ACP provides voice and identification monitoring of selected navigation aids.

Systems are monitored using headphones or speakers. Receiver volume is controlled on the ACP by rotating the knob beneath the respective receiver. A cockpit loudspeaker is provided adjacent to each pilot seat with a speaker volume control located in the center of the speaker.

Microphones are keyed by pushing the desired ACP transmitter select switch and holding in a Push-To-Talk (PTT) switch. The PTT switches are located on:

There is a boom microphone on the headset, a microphone in the oxygen mask and a hand microphone jack at all flight crew member stations.

The oxygen mask microphone is enabled and the boom microphone disabled when the BOOM/OXY BOOM/MASK switch on the ACP is in the OXY MASK position. Conversely, the oxygen mask microphone is disabled and the boom microphone is enabled when the BOOM/OXY BOOM/MASK switch is in the BOOM position.

When the oxygen mask stowage door is open, the oxygen mask microphone is enabled and the boom microphone is disabled. The boom microphone can be reselected by closing the left oxygen panel door and pushing and releasing the reset/test switch. This also shuts off oxygen to the mask. The oxygen can be restored by opening the left oxygen panel door.

Radios