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and HF communication systems can be used for SELCAL monitoring. The SELCAL code is
a four--letter code assigned to each aircraft and is represented by a combination of audio
tone signals. <0011><0060>
Each aircraft is assigned its own SELCAL code when the decoder is installed in the aircraft.
The strapping connector is located next to the decoder in the avionics compartment and
provides the means of programming the decoder with the aircraft SELCAL code.
For SELCAL operation, the crew will normally tune one of the VHF radios to a pre-assigned
SELCAL frequency. When ATC contacts the flight crew, the ground communication
equipment sends a SELCAL code on this frequency. When the SELCAL signal is received
by the VHFcommunications system, it is redirected to the decoder. The decoder then sends
a signal to the EICAS and Audio Integrating System. A green SELCAL VHF advisory
message will be displayed on the EICAS status page and a “SELCAL” oral message will be
heard through the speakers and headsets. Pressing the PTT button for the VHF radio that
received the call will reset the channel decoder and EICAS advisory.
REV 56, Jan 31/03
Vol. 1 05--45--2
COMMUNICATIONS
Selective Call System (SELCAL)
Flight Crew Operating Manual MASTER
CSP A--013
For SELCAL operation, the crew will normally tune one of the VHF or HF radios to a
pre-assigned SELCAL frequency. When ATC contacts the flight crew, the ground
communication equipment sends a SELCAL code on this frequency. When the SELCAL
signal is received by the VHF or HF communications system, it is redirected to the decoder.
The decoder then sends a signal to the EICAS and Audio Integrating System. A green
SELCAL VHF/HF advisory message will be displayed on the EICAS status page and a
“SELCAL” oral message will be heard through the speakers and headsets. Pressing the
PTT button for the VHF or HF radio that received the call will reset the channel decoder and
EICAS advisory. <0011><0060>
Vol. 1 05--45--3
REV 56, Jan 31/03
COMMUNICATIONS
Selective Call System (SELCAL)
Flight Crew Operating Manual
CSP A--013
MASTER
Selective Call System (SELCAL) --- Simplified Diagram <MST>
Figure 05---45---1
VHF/COMM 2 VHF/COMM 1
AUDIO AUDIO
RTU 2 RTU 1
CH 4 CH 3 CH 2 CH 1
SELCAL
RESET
EICAS
MESSAGES
SELCAL
CODE
AECU DCUs
RESET
(MIC PITT)
EICAS
STRAPPING CONNECTOR
SELCAL
DECODER
SELCAL
28 VDC
BUS 1
CBP1--H9
28 VDC
SELCAL
AURAL MSG
ANTENNA ANTENNA
VHF/COMM 3
AUDIO
ANTENNA
<0008>
<0014>
<0082>
<0084>
AUDIO
<0011>
HF/COMM HF/COMM
<0060>
ANTENNA
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Vol. 1 05--45--4
COMMUNICATIONS
Selective Call System (SELCAL)
Flight Crew Operating Manual MASTER
CSP A--013
SELCAL EICAS Messages <MST>
Figure 05---45---2
Indicates that SELCAL has been
received.
Alerts inhibited by pushing PTT
button.
SELCAL VHF (1, 2) advisory (green)
SELCAL VHF (1, 2, 3) advisory (green)
SELCAL VHF 3 advisory (green)
SELCAL HF advisory (green)
SELCAL HF (1, 2) advisory (green)
Status Page
SELCAL, SELCAL
<TYP><0010>
<0008><0010><0014>
<0082, 0084>
<0010><0060>
<0010><0011>
<0039>
<0039>
Vol. 1 05--45--5
REV 56, Jan 31/03
COMMUNICATIONS
Selective Call System (SELCAL)
Flight Crew Operating Manual
CSP A--013
MASTER
A. System Circuit Breakers
SYSTEM SUB--SYSTEM CB NAME BUS BAR CB
PANEL
CB
LOCATION
NOTES
Selective Call
System
Decoder SELCAL DC BUS 1 1 H9
REV 56, Jan 31/03
Vol. 1 05--45--6
COMMUNICATIONS
Selective Call System (SELCAL)
Flight Crew Operating Manual MASTER
CSP A--013
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