Section 7
Description of the Airplane and Systems
Columbia 400 (LC41-550FG)
RC050002
Initial Issue of Manual: November 10, 2004
7-122
Latest Revision Level/Date: A/12-01-2004
•
CREW mode
places the pilot and copilot on a common ICS communication channel. The
passengers are on their own intercom channel and can communicate with each other but
cannot communicate with the crew or hear the aircraft radios.
•
ALL mode
allows full intercom communication between everyone plugged into the GMA
340. All seat positions hear ATC communications.
•
MUSIC 1
and
MUSIC 2
stereo entertainment inputs are affected by the intercom mode
selected.
MODE
PILOT HEARS
COPILOT
HEARS
PASSENGER
HEARS
MUSIC 1
MUTING
TRIGGERED BY
PILOT
(LED LIT)
•
Selected radios
•
Pilot
•
Copilot
•
Passengers
•
Music 1
•
Passengers
•
Copilot
•
Music 1
•
Copilot or
passenger ICS
activity.
CREW
(LED LIT)
•
Selected radios
•
Pilot
•
Copilot
•
Music 1
•
Selected Radios
•
Copilot
•
Pilot
•
Music 1
•
Passengers
•
Music 2
•
Aircraft radio
activity
•
MKR activity
•
Pilot or copilot
ICS activity
ALL
(LEDs OFF)
•
Selected radios
•
Pilot
•
Copilot
•
Passengers
•
Music 1
•
Selected Radios
•
Pilot
•
Copilot
•
Passengers
•
Music 1
•
Selected Radios
•
Pilot
•
Copilot
•
Passengers
•
Music 1
•
Aircraft radio
activity
•
MKR activity
•
ICS activity
Figure 7 - 47
Marker Beacon Receiver –
The beacon is used as part of an ILS approach, and in certain
instances, to identify an airway. There are three lights, blue (outer marker), amber (middle
marker), and white (inner/airway marker), which give a visual and aural indication when the
respective marker is crossed in flight. In addition to the normal marker beacon functions, the
GMA 340 provides an audio muting function. The lamps illuminate, and an associated keyed-
tone is heard when the MKR audio is selected, when the aircraft passes over a 75 MHz marker
beacon transmitter.
The GMA 340’s marker beacon receiver controls are located on the left side of the front panel.
The SENS button selects either high or low sensitivity as indicated by the HI or LO LED being
lit. Low sensitivity is used on ILS approaches while high sensitivity allows operation over
airway markers or to get an earlier indication of nearing the outer marker during an approach.
The marker audio is selected initially by pressing the MKR/mute button. If no marker beacon
signal is received, then pressing again will deselect the marker audio. This operation is similar to
selecting any other audio source on the GMA 340. However, if the second button press occurs
while a marker beacon signal is received, then the marker audio is muted but not deselected. The
button’s LED will remain lit to indicate that the source is still selected. The unit will
automatically un-mute the audio when the current marker signal is no longer being received. The
marker beacon lamps operate independently of any audio selection and cannot be turned off.