Garmin SL10 User Manual

Page 6

UPS Aviation Technologies

SL10 Series Audio Selector Panel and Intercom System

User’s Guide

Page 2

1.2.1 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.

1.3

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 O

is C

1. Both

pilot and copilot will be connected to the Com
l transceiver. While in the C

1 or C

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

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

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

to C

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.
In SL10-series units, Serial Number T03092 and above, when switching
the mic selector rotary switch from C

1 to C

2, while C

2 audio

had been selected, Com 1 audio will continue to be heard. This
eliminates the pilot having to switch Com 1 audio back on, if desired.
When switching from C

1 to C

2 while Com 2 has NOT been

selected, Com 1 audio will be switched off. In essence, switching the mic
selector will not effect the selection of Com audio.

Important: When the mic selector is in the full counter clockwise

position, the SL10 power is removed, and it is in the

FAIL

SAFE

mode.

The pilot headset and microphone is connected directly to Com 1.

Figure 2

Mic Selector