Marker Beacon Operation - PS Engineering PMA8000C Operation Manual

the ISO mode is selected. Then press and hold the COM 3 button, then hold
the ICS mode button for more than one second. The ICS indicator will blink
slowly to indicate music is present in ISO. The music muting will be the
selected mode.
A : All parties will hear the aircraft radio and intercom. Crew will hear
LL
Music 1, passengers can hear Music 1 or 2. The music mutes in accordance
with the muting mode selected.
C : (Crew) Pilot and copilot are connected on one intercom channel and
RW
have exclusive access to the aircraft radios. The passengers have their own
intercom. The music that the crew and passengers will hear is determined by
the Smart Function Keys.

Marker Beacon Operation (9)

The Marker Beacon Receiver uses
visual and audio indicators to alert
you when the aircraft passes over a
Beacon transmitter.
The Blue, Outer Marker lamp has an
associated 400-Hertz Morse '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 min-
ute.
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 added to the selected audio pushing
the "MKR switch momentarily and noting the AUD indicator lights. There is
a service adjustment located on the top of the unit to adjust the marker re-
ceiver volume if desired.
The MKR button is also used to test the indicator lamps and mute the marker
audio. Pressing the MKR button for one second will cause the marker audio
to mute. The next beacon received will re-activate the audio.
Holding the MKR button for one second also activates marker test, labeled
"T/M" and illuminates all three lamps simultaneously to confirm the lamps
(internal and external) are working. Releasing the button returns to the last
sensitivity.
The marker can be set for high sensitivity with
an external switch. In the High sensitivity mode,
the LOW indicator will extinguish.
May 2015 PMA8000C Pilot Guide
202-890-0303 Page 5