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PS Engineering

PAC24 Series Audio Selector Panel and Intercom System

Installation and Operator’s Manual

200-240-0008 Page 2-9 Rev. 8, June 2003

Caution: Local oscillators and internal signals from some entertainment equipment can cause undesired

interference with other aircraft systems. Before takeoff, operate the entertainment devices to determine if

there is any adverse effect within the aircraft systems. If any unusual operation is noted in flight, immedi-

ately switch off the entertainment devices.

All entertainment devices must be switched off for both takeoff and landing.

2.4.13.2 Entertainment inhibit

The music input to the PAC24 uses the existing Speaker Power input from the KMA24-71. This pin should

be removed even if music is not desired. However, if avionics power remains on Pin 7, there is the

possibility of power ripple entering the system. The Music input can be deactivated from the front panel by

pressing the NAV 1 and AUX buttons for at least 3 seconds. The audio panel will then ignore any signal

on this input, until the Music Off mode is toggled again.

2.4.14 Intercom expansion (J3, Pins 22, 23 and a

)

The PAC24 contains a five-place intercom (pilot, copilot and three passengers). In applications where more

intercom positions are needed, PS Engineering can provide intercom expansion units, such as the Intelli-

PAX, part number 11606, 11606R, etc. These can add up to six additional stereo intercom stations, plus

independent stereo music input. Interface to the expansion unit is through, pins 22 (audio input from ex-

pansion unit), 23 (audio output to expansion unit) and a

(9 VDC expansion power).

These pins are shared with the microphone inputs; therefore the internal DIP switched must

be correctly

configured (see above).

2.4.15 Playback button Installation (Pin 2- Option 1 units only)

To activate the Recording System playback, a momentary push button switch is required. This switch can

be located anywhere in cockpit convenient to the pilot's reach. The normally open switch must be con-

nected to pin 2 of J3 of the PAC24, and ground. This pin is shared with the CVR output; therefore the in-

ternal DIP switched must

be correctly configured (see above).

2.5 Adjustments

The PAC24 is factory adjusted to accommodate the typical requirements for most aircraft configurations.

There are two adjustments however, that will allow the installer to tailor the volume controls to suit spe-

cific functions.

Figure 2-1- PAC24 Adjustments

PA Volume

Master Volume

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 34 35

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