Operating instructions

202-066-0002 3 PMA6000 –Mono Pilot Guide
beled 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 will 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 from Com 1 and Com 2, as indicated by their
respective lamps.
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.
Mic Selector Switch (Fail Safe Operation)
Figure 2 Mic Selector
Unit power is turned on and off by the
Mic selector switch. In the
OFF or
"
FAIL-SAFE" position, the pilot is con-
nected directly to Com 1 allowing
transmit and receive capability regard-
less of unit condition. Any time power
is removed or turned
OFF, the audio se-
lector will be placed in the fail-safe mode. In fail-safe mode,
the pilot headset is connected directly to Com 1. The first posi-
tion clockwise from O
FF is COM 1. Both pilot and copilot will
be connected to the Com l transceiver.
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