202-890-0913 Page 7 OCT 2017 PMA8000G Pilot Guide
Remote ICS Mode switch
If a remote SWAP switch is installed, the intercom mode can be changed by
a long press (more than 1 second) of the swap button.
Alternate Intercom Function
This function controls the distribution of aircraft radio within the intercom,
as well as passenger intercom muting, when in the “ALL” intercom mode.
In the “standard intercom function” mode, aircraft radios are distributed to
all, when the intercom is in the ALL mode. In CREW mode, only the pilot
and copilot positions will hear aircraft radios.
When “Alternate Intercom” function is toggled (hold ICS button for more
than three seconds in ALL mode) a voice announces “Alternate Intercom
Function,” and the passengers will NOT hear aircraft radios, even in the All
intercom mode. They will be able to converse with the crew. However, when
the aircraft radio becomes active, the intercom audio from the passengers is
muted, allowing the crew to focus on the radio. The passengers will still be
able to talk to each other. Pressing holding the ICS button for three seconds
again switches the intercom back to “Standard Intercom Function.”
Alternate Intercom mode is reset at power up.
Marker Beacon Operation (9)
The Marker Beacon Receiver uses visual and audio indicators to alert you
when the aircraft passes over an ILS Marker Beacon transmitter.
The Blue, Outer Marker lamp has an associated 400-Hertz 'dash' tone. The
lamp and tone will be keyed at a rate of two tones/flashes per second when
the aircraft is in the range of the Outer Marker.
The Amber, Middle Marker lamp is coupled with a 1300 Hertz tone, keyed
alternately with short 'dot' and long 'dash' bursts at 95 combinations per mi-
nute.
The White, Inner marker lamp has a 3000 Hertz 'dot' tone, and will be keyed
at a rate of six times per second.
Marker Beacon Receiver audio can be heard by a short press of the "MKR"
push-button switch. The Audio (AUD) indicator will illuminate.
The MKR button is also used to set the receiver sensitivity and to test the
indicator lamps mute the marker audio.
Short press - Controls Marker audio on/off. The top
indicator (AUD) lights green when audio selected. Se-
lection will be remembered during power cycles.
Medium press - This mutes the marker beacon audio.
It will stay muted until the pilot reaches the next ILS marker indicator and
then it will un-mute. The test mode is activated, all the marker lamps activate
and light the T/M indicator next to the MKR button.
(Continued on page 12)
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