202-045-0200 Page 3 August 2017 PAC45 Pilot Guide
CTL45P Operating Controls
Power and Fail Safe
Unit power is controlled by the transmitter
(XMT) selector knob. In the "EMG" or off
(fully clockwise) position, the pilot headset is
connected directly to COM 1 as well as alerts
and unswitched input #1. This allows communication capability regardless of
unit condition. NAV1 audio is also provided to the pilot in the other ear of a
stereo headset.
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 ste-
reo mode.
The power controls all audio selector panel functions, and intercom.
Communications Transmit (XMT) Selection
The PAC45 has a rotary control knob to select
communications transceiver functions. To select a
transceiver for transmit; turn the knob to select the
desired radio.
The radio is automatically selected to receive in-
coming radio calls when the XMT is selected.
With a PAC45, you will never transmit on a radio
that you are not receiving. The selected audio is
indicated by both knob position and the green
text. The pilot and copilot controllers can select
any of the installed transceivers. In the case where both have selected the
same radio for transmission, the pilot will have priority when he uses the ra-
dio push to talk.
COM Audio Selector
The communications receiver
audio sources are controlled by
a combination push on-push-off
switch/volume control. Com-
munication audio from another
radio, not selected for transmit, can be heard by pressing the associated RCV
switch, which will place it in the OUT position. The selected audio is indicat-
ed by both knob position and the green nomenclature text.
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