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SELCAL OPERATION
When a selcal call is received, the CALL light flashes
amber on the corresponding transmission key and a
buzzer sound is heard.
The buzzer signal is generated by the Flight Warning
Computer (FWC).
CALL flashes amber on all the ACPs when a selcal call
is received.
The CALL indication can be manually cleared by pressing
the RESET key on any ACP or it can be automatically
cleared upon transmission on the called channel.
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ALL
SELCAL SYSTEM PRESENTATION
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SELF EXAMINATION
How is the SELCAL CALL light reset?
A - By pressing the transmission key on the
ACP.
B - By pressing the CLR pushbutton.
C - By pressing the RESET key on any ACP.
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23 - COMMUNICATIONS
23-11-00 SELCAL AND COCKPIT CALL SYSTEM
D/O
CONTENTS:
General
SELCAL Operation
Ground Call
Attendant Call
Self Examination
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SELCAL AND COCKPIT CALL SYSTEM D/O
GENERAL
The SELCAL and CALL functions are performed in the
Audio Management Unit (AMU) by the SELCAL/CALL card.
This card receives SELCAL calls from the ground
stations via the communication channels, a SELCAL code
from the SELCAL code panel, CALLs from the ground crew
and the attendant stations and provides visual and
aural warnings.
SELCAL OPERATION
The SELCAL/CALL card has 7 inputs connected to the
communication receiver SELCAL outputs. These inputs
are permanently scanned, and when a SELCAL signal is
present, a comparison is made with the code programmed
on the SELCAL code panel.
When the 2 codes agree, a message is sent to the various
ACPs, via the corresponding audio cards.
On the ACPs, the CALL light, corresponding to the
communication channel used, flashes amber.
At the same time, data is sent to the flight warning
computers (FWC). The FWCs send an audio call buzzer
to the loudspeakers.
The Call is cancelled using the RESET key on one ACP,
or selecting the called channel and activating the
PTT.
TMUCOM102-T01 LEVEL 3
EFFECTIVITY 23-11-00 Page 2
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
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ALL
SELCAL AND COCKPIT CALL SYSTEM D/O
TMUCOM102-P01 LEVEL 3
EFFECTIVITY 23-11-00 Page 3
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ALL
SELCAL AND COCKPIT CALL SYSTEM D/O
GROUND CALL
Two types of calls may be received by the SELCAL/CALL
card :
- ground call and,
- cabin attendant call.
When the cockpit call pushbutton, located on the
external power control panel, is pressed, ground
information is sent to the SELCAL/CALL card and to the
FWC.
The FWC activates the buzzer signal through the
loudspeakers.
The SELCAL card sends a signal through the various
audio cards to the ACPs.
The MECH legend flashes amber for 60 seconds on the
ACPs.
The visual call is automatically cancelled and the
circuit reinitialized after 60 seconds or when the
RESET pushbutton is pressed in, on any ACP.
The automatic reset may be cancelled with the AMU pin
programming.
ATTENDANT CALL
When a call is made from a cabin attendant station,
the cabin intercommunication data system (CIDS)
generates ground information to the SELCAL/CALL card
and to the FWC.
During one second, the FWC activates the buzzer signal
through the loudspeakers.
The SELCAL/CALL card sends a signal through the various
audio cards to the ACPs.
The ATT legend flashes for 60 seconds on the ACPs.
The visual call is automatically cancelled and the
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