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Operation
The VHF and/or HF communication systems are tuned to a SELCAL frequency that has been
assigned to a ground station.
When a ground station wants to talk to the flight crew, the ground station sends a SELCAL code
on the assigned frequency. The SELCAL unit monitors the VHF and HF communication systems
audio output channels.
When a SELCAL signal is received, the decoder checks the signal tones for the correct frequency,
sequence, amplitude, and duration.
GF0610_050
" SELCAL, SELCAL"
If all the parameters are met, a SELCAL HF or VHF advisory message will be displayed on EICAS
and the audio integrating system will command an aural message “SELCAL, SELCAL” in the flight
compartment speakers and headsets.
The pilot selects the respective VHF or HF system on the audio panel and when the Push-To-Talk
(PTT) switch is pushed, the EICAS message is cancelled.
COMMUNICATIONS
Flight Crew Operating Manual REV 41, Jul 08, 2004
CSP 700−6
Volume 2
06−10−24
RADIO ALTIMETER
The Radio Altimeter (RA) system provides airplane altitude above the terrain up to +2550 feet. The
RA system is comprised of two RA transceivers, each connected to two separate antennas. The
antennas are identical and dedicated, one for transmitting and the other for receiving. The antennas
are positioned on the bottom centerline of the fuselage to minimize performance degradation in turns
and prior to landing while in the flare on landing.
GF0610_051
RAD
Radio Altitude Failure
Boxed "RAD"display replaces
RA digits.
Takes priority over miscompare
annunciation.
Radio Altitude Miscompare
Boxed " RAD"display above
RA digits.
Indicates a miscompare of
greater than 10 feet on ground
and varies with altitude in flight.
0 RAD
20 20
20 20
The altitude above the terrain indication for approach and landing phases of operation is displayed
on the Primary Flight Display (PFD).
GF0610_052
MINIMUMS Outer Knob
Height (DH) value on PFD.
RAD − Sets the Decision
AP1 HDG 104 00
VAPP
500 RAD
ASEL
VNAV
RAD BARO
MINIMUMS
The Decision Height (DH) is displayed on the PFD when the minimums on the PFD controller is set
to RAD.
The following systems receive RA information:
• TCAS.
• EGPWS.
• FCUs.
• DAUs (to display processors for PFD displays).
Refer to FLIGHT INSTRUMENTS Chapter 11, for additional information on RA indications.
COMMUNICATIONS
REV 41, Jul 08, 2004 Flight Crew Operating Manual
CSP 700−6
Volume 2
06−10−25
STATIC DISCHARGER
The airplane wings and tail sections contain static wicks installed to discharge static electricity,
reducing radio interference. They are installed at the following locations:
• Winglets/wingtips and ailerons.
• Elevators, rudder, vertical stabilizer, horizontal stabilizer and tail cone.
GF0610_053
There are two parts to each static discharge assembly: the static discharger and the mounting base.
If any are found missing during the walkaround, refer to the configuration deviation list of the AFM to
verify if you can dispatch.
GF0610_054
COMMUNICATIONS
Flight Crew Operating Manual REV 51, Aug 14, 2006
CSP 700−6
Volume 2
06−10−26
COCKPIT VOICE RECORDER
The Cockpit Voice Recorder (CVR) is a crash survivable recording device that simultaneously
records four channels of audio data representing the cockpit acoustic environment. The system
consists of:
• CVR.
• Microphone monitor/control panel.
• Remote area microphone.
• Impact switch.
CVR LOCATION
The CVR retains the most recent two hours of recorded information in memory. Input is received
from each audio control panel and CVR area microphone. The CVR also receives digital data (GMT
time) from DAU #4 to synchronize the CVR with the flight data recorder.
COCKPIT VOICE
RECORDER
GF0610_055
The CVR is mounted in the aft equipment bay. The microphone monitor/control panel is located in
the flight compartment right side panel.
MICROPHONE MONITOR CONTROL PANEL
GF0610_056
STATUS Display
Illuminates as a function
of test and/or failure.
ERASE Push button
Pushing the ERASE
push button initiates a
memory erase sequence
within the CVR.
HEADSET Monitor Jack
Used to monitor tone
transmissions during test
and audio signals currently
being recorded.
TEST Push button
Pushing the test button
　
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