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This pilot guide provides detailed operating instructions for the PS Engineer-
ing PAC45J, Audio Selector Panel/Intercom Systems. Please read it careful-
ly before using the equipment so that you can take full advantage of its capa-
bilities. NOTE: Because of user customization of the labels, appearance
may differ from illustrations
PAC45J Operating Controls
Power and Fail Safe (11)
Unit power is controlled by the transmitter (XMT) selector knob. In the
"EMG" or off (fully clockwise) position, the pilot headset is connected di-
rectly to COM 1 as well as alerts and unswitched input #1. This allows com-
munication capability regardless of unit condition. NAV1 audio is also pro-
vided to the pilot in the other ear of a stereo headset. If NAV 1 is not pre-
sent, verify tat the headset is in stereo and that the installation is configured
for stereo operation.
In Fail Safe (EMG) on the Copilot panel, that position will hear COM 2. The
copilot can place the control panel in EMG without affecting pilot operation.
Any time power is removed or turned off, the audio selectors will revert to
fail-safe mode. If fail-safe audio is present in both ears of a stereo headset,
or completely absent, verify that a stereo headset is used and is selected for
stereo mode.
The power controls all audio selector panel functions, and intercom.
Page 2
202-045-2200
Oct. 2021 PAC45J Pilot Guide
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