PS Engineering
PAC24 Series Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-240-0008 Page 3-6 Rev. 8, June 2003
3.7.4.1 Music Off
Music Off mode may be selected in cases where a music input is not connected, or in use, but audio noise
can be heard due to other loads or cross-talk in the system.
Music can be inhibited completely by pressing NAV1 and AUX for at least 3 seconds. Music Off
will override karaoke mode
3.8 Telephone Mode
The Com 5 mode can serve as a full duplex interface for telephone systems if the installation is correctly
configured. When interfaced with an approved airborne telecommunications system, the PAC24 can serve
as an audio control and distribution center. The crewmember’s telephone access is the "Com 5" button on
the audio panel. When Com 5 is active in the duplex mode, the TX button will blink about twice as fast as
the normal transmit rate.
In a single installation, the intercom mode select switch determines who is on the phone:
ISO - pilot
CREW - pilot and copilot
ALL - pilot, copilot, passengers
In a standard dual installation, the pilot and copilot can select TEL (Com 5) mode independently by press-
ing their respective COM5 Xmt button. The passengers are on the phone only when the pilot has selected
Com 5 mode and his ICS mode switch is in the ALL position.
The copilot cannot put the passengers on the phone, and the passengers can only get on the phone when the
pilot is on the phone.
In an observer dual installation, the crew box works like a single installation. The observer is treated like a
passenger, so he would be on the phone line when COM5 Xmt is selected and the intercom switch is in
ALL mode. The observer cannot select telephone mode independently. The observer is on the phone if the
crew system is in ALL and the observer is not in ISO.
Note: Because the cellphone uses an intercom circuit, all stations on that circuit will lose
intercom capability when the cellphone is in use.
3.9 Internal Recorder System (Option 1 Units Only)
The Intercom Recording System (referred to here as the IRS) is a digital recording system allowing auto-
matic storage and playback of aircraft radio traffic.
Operating as a continuous loop recorder, (first message received will be the last heard), the recorder has
one minute of recording time or up to 16 messages. With its own built in VOX circuit, there are no buttons
to press to start recording. The system automatically begins to record the instant the radio becomes active.
Only aircraft radio audio in pilot’s headset is recorded and only the pilot will hear the playback audio.
3.9.1 Operation
Recording is automatic; there is no action required by the pilot. To play back the last recorded message,
simply press the momentary switch associated with the IRS. Each additional press of the button will play
the preceding recorded message. You must wait for the message to finish playing before accessing the
prior message.
To cancel the playback, press and hold the playback button for two seconds. The next time the button is
pressed, the next earlier message will be heard.
3.9.2 Concurrent Messages
When a recorded message is playing, the recording is momentarily inhibited. For instance, if an IRS mes-
sage is being played, recorder will not begin until the IRS message is finished.
(41 Seiten)
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