Installation manual

UPS Aviation Technologies
SL10 Series Audio Selector Panel and Intercom System
Installation Manual
3-1
Section III OPERATION
GENERAL INFORMATION
3.1 SCOPE
This section provides detailed operating instructions for the UPS Aviation Technologies SL10, SL10S,
SL10M, SL10M-S, SL10C, SL10S-C, SL10M-C, and SL10M-S-C Audio Selector Panel/Intercom
Systems. Please read it carefully before using the equipment so that you can take full advantage of its
capabilities.
This section is divided into four sections covering the basic operating areas of the SL10 systems. They are:
Audio Selector, Transceiver Selection, Intercom, and Marker Beacon Receiver (SL10M and SL10MS
only).
3.2 Audio Selector (All models)
Through the use of two momentary and seven latched, push-button,
back-lit switches, it is possible to select any or all receiver audio. C1
and C2 are momentary switches.
When selected, an internal backlight will illuminate indicating which
audio source is selected. Because the rotary switch controls what
transceiver is being heard by the pilot and copilot (the crew), "Cl"
(Com 1) and "C2" (Com 2) push-buttons are of the momentary type
and do not remain in when selected. This is also part of the "auto
function." You will always hear the audio from the transceiver that is
selected by the rotary mic selector switch.
The users can identify which receivers are selected by noting which
push-button switches are illuminated. Push buttons labeled Nl (Nav 1), N2 (Nav 2), D (DME), M (Marker),
A (ADF), AX (auxiliary), and S (Speaker) are "latched" type switches. When one of these buttons is
pressed, it will stay in the "in" position. Press the switch again and it be in the "out" position and remove
that receiver from the audio. While selected, the switch will also be annunciated by an internal lamp.
NOTE: In Split Mode, no pushbuttons will be active. The only audio selected is the com 1 and 2, as
indicated by their respective lamps.
3.2.1 Speaker Amplifier
The "S" in the push-button section stands for speaker. This switch will place all selected audio on the
cockpit speaker when this switch is selected. NOTE: with the exception of unswitched unmuted inputs
(Altimeter warning), the speaker amplifier is not active in the "Split Mode." To reduce power consumption
and internal heat buildup in the avionics stack, switch off the speaker amplifier when not in use.
3.3 Mic Selector Switch (Fail Safe Operation)
Unit power is turned on and off by the Mic selector switch. In the
OFF or "FAIL-
SAFE" position, the pilot is connected directly to Com 1 allowing transmit and
receive capability regardless of unit condition. Any time power is removed or
turned
OFF, the audio selector will be placed in the fail-safe mode. The first
position clockwise from OFF is COM 1. Both pilot and copilot will be connected
to the Com l transceiver. While in the C
OM 1 or COM 2 mode, the intercom
functions normally. Both the pilot and copilot have transmit capabilities on the
selected transceiver. All hear the selected audio if the intercom is in the A
LL
mode. Only the person who presses their Push To Talk (PTT), will be heard over
the aircraft radio. Turning the rotary switch to the C
OM 2 position will place pilot
and copilot on Com 2.
The SL10-Series has an automatic selector mode. Audio from the selected
transceiver is automatically heard in the headsets and speaker (when selected). You can check this function
by switching from C
OM 1 to COM 2 and watch the selected audio light on the selector change from C1 to
C2. This ensures the pilot will never transmit on a radio is not listening to.
Figure 3-1 Audio Selector
Figure 3-2
Mic Selector