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The volume control lever on the audio control panel permits control of the receiver volume without affecting the operation of the SELCAL system.  In the event of SELCAL system failure, the VHF communications systems will continue to operate normally.
Continental
Rev. 12/01/00 #29 Flight Manual
Flight Interphone System
The flight interphone system provides for communications between positions (stations) within the aircraft, selection and monitoring of the audio outputs of the communications transceivers and navigation receivers, and for selection and transmission with the communications transceivers. Audio selection function is provided and permits the operator to select and monitor the audio output of one or more communications transceivers and navigation receivers. Microphone selection function enables the operator to select and control the desired communications transceiver. The microphone switch on the outboard horn of either control wheel, or a switch on each audio panel provide two means to key transmissions while using the boom or mask microphone. The PTT switch on each hand microphone provides a third means for keying transmissions.
Audio control panels are included for the Captain and F/O, and are also located on the overhead panel for the Observer, and in the electrical / electronics compartment.
A hand microphone jack and a headset jack are installed at the Captain’s, F/O’s, and Observer’s stations. Hand microphone and headset jacks are located in the electrical / electronics compartment for use by maintenance personnel. In addition, a handset jack is located on the external electrical power receptacle panel. Two speaker assemblies are installed overhead in the flight compartment to monitor audio signals selected by the Captain and F/O respectively. Both flight compartment speakers are muted if any microphone is keyed from the Captain or F/O’s station, or if the pedestal handset is keyed on passenger address (PA). The speakers do not mute if a microphone is keyed at the Observer’s station or if the pedestal handset is keyed on service interphone.
Service Interphone System
The service interphone system provides intercommunication between various service and maintenance areas, flight compartment, and cabin attendants. Telephone type handsets in the flight compartment and at the forward, mid and aft attendant’s panels are used for both the service interphone and passenger address system. A switch located in the flight compartment turns off all maintenance interphone jacks when in OFF. All maintenance interphone jacks are connected to the service interphone system when the switch is in ON.
Call System
The call system consists of call lights, aural signals, and call switches which provide both visual and/or aural signals to alert the flight crew of a call from the cabin attendants or ground maintenance, to alert cabin attendants or ground maintenance of a call from the flight crew, and to alert one cabin attendant station of a call from another cabin attendant’s station. The call system also provides a visual and aural signal to alert the cabin attendants of passenger(s) requiring assistance at the passenger seats or in the lavatories.
Passenger Address And Passenger Entertainment Systems
The passenger address (PA) system enables the pilots and cabin attendants to address passengers through speakers located throughout the cabin and in the lavatories. The same handsets installed in the flight compartment and at the forward, mid, and aft attendant’s panels for the service interphone system are used for the passenger address system. PA announcements from the flight compartment station have priority over PA announcements from the cabin stations and the passenger entertainment system. Refer to Chapter 6, Aircraft General, for further description of PA and entertainment systems.
Voice Recorder System
The voice recorder system records all sounds and voice conversations audible in the cockpit, communications through the Captain’s and F/O’s audio panels, and the cockpit handset. The recorder contains a 30-minute continuous loop tape, which unless erased, preserves the last 30 minutes of sound and communication. The cockpit monitor unit contains controls for testing the recorder and erasing previous recordings. It also contains a monitor microphone and a headset jack. The voice recorder system operates continuously when electrical power is on the right radio bus.
Continental
Rev. 12/01/00 #29 Flight Manual
Automatic Communications Addressing and Reporting System (ACARS)
ACARS is a data link communications system with air-to-ground (down-link) and ground-to-air (up-link) capability. The system can handle a large volume of data communications in a few seconds with a resulting reduction of VHF communications requirements. ACARS equipment, installed in the aircraft, operates in conjunction with special ground-based, remote stations and a central computer that is used for message processing. Data is subsequently distributed via dedicated land lines for further dissemination as required.
　
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