Section 7
Columbia 400 (LC41-550FG)
Description of the Airplane and Systems
Initial Issue of Manual: November 10, 2004
RC050002
Latest Revision Level/Date: A/12-01-2004
7-121
and MKR as selected. The Split Com mode is cancelled by pressing the Com 1/2 button a second
time.
When in the Split Com mode, the copilot may make PA announcements while the pilot continues
using Com 1 independently. When the PA button is pressed after the Split Com mode is
activated, the copilot’s microphone is output over the cabin speaker when keyed. A second press
of the PA button returns the copilot to normal Split Com operation.
Aircraft Radios and Navigation –
Pressing NAV 1, NAV 2, DME, or MKR selects each audio
source. A second button press deselects the audio.
Speaker Output –
Pressing the SPKR button selects aircraft radios over the cabin speaker. The
speaker output is muted when a Com microphone is keyed.
PA Function –
Pressing the PA button activates the PA mode. Then when either the pilot or
copilot’s microphone is keyed, the corresponding mic audio is heard over the cabin speaker. If
the SPKR button is also active, then any selected speaker audio is muted while the microphone is
keyed. The SPKR button does not have to be previously active in order to use the PA function.
Intercom System (ICS) –
Intercom volume and squelch (VOX) are adjusted using the following
front panel knobs:
•
Left small knob – Unit On/Off power control and pilot ICS volume. Full counterclockwise
detent position is Off.
•
Left large knob – Pilot ICS mic VOX squelch level. Clockwise rotation increases the amount
of mic audio (VOX level) required to break squelch. Full counterclockwise is the “hot mic”
position.
•
Right small knob – In position: Copilot ICS volume. Out position: Passenger ICS volume.
•
Right large knob – Copilot and passenger mic VOX squelch level. Clockwise rotation
increases the amount of mic audio (VOX level) required to break squelch. Fully
counterclockwise is the “hot mic” position.
Each of the four microphone inputs have dedicated VOX circuits ensuring that only the active
microphone(s) is/are heard when squelch is broken. After the operator has stopped talking, the
intercom channel remains momentarily open to avoid closure between words or normal pauses.
The unit provides three intercom modes: PILOT, CREW, and ALL. The mode selection is
accomplished using the PILOT and/or CREW buttons. Pressing a mode button activates the
corresponding ICSA mode. Pressing again deactivates the mode. The operator can switch
directly from PILOT to CREW or from CREW to PILOT by pressing the other mode button. The
ALL mode is active when neither the PILOT nor CREW LED is lit. To switch from PILOT to
CREW mode, press the CREW button; from CREW to PILOT, press the PILOT button. An LED
ON indicates the isolation mode is active. The following modes are summarized in Figure 7 - 47.
•
PILOT mode
isolates the pilot from everyone else and dedicates the aircraft radios to the
pilot exclusively. The copilot and passengers share communication between themselves but
cannot communicate with the pilot or hear the aircraft radios.