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EFFECTIVITY Page 279
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SERVICE INTERPHONE D/O
LGCIU AND SERVICE INTERPHONE OVERRIDE CONDITIONS
The SERVICE INTERPHONE SYSTEM is integrated in the
CIDS DIRECTORS.
There are 2 modes to connect the JACKS to the SERVICE
INTERPHONE.
The AUTOMATIC mode:
On ground only, with the Landing Gear down and
compressed or with the GROUND POWER connected.
The Landing Gear Interface Units (LGCIUs) send a ground
signal to the SERVICE INTERPHONE SYSTEM, integrated
in the DIRECTORS.
The MANUAL mode:
The SERVICE INTERPHONE OVERRIDE pushbutton 15RJ, on
the overhead panel (50 VU), must be pressed. Then the
white ON light comes on.
The aircraft is on the ground with no signal from the
LGCIUs (e.g: The LGCIUs are not supplied). When the
SERVICE INTERPHONE OVERRIDE pushbutton is pressed, a
ground signal is sent to the DIRECTORS.
OPERATIONS FROM COCKPIT
To establish a speech communication from the cockpit
with the SERVICE INTERPHONE JACKS, the CABin key on
any AUDIO CONTROL PANEL (ACP), must be pressed.
The audio signals are transmitted to the JACKS through
the Audio Management Unit (AMU), the SERVICE INTERPHONE
SYSTEM, integrated in the CIDS DIRECTORS and the audio
lines.
OPERATIONS FROM CABIN STATIONS
To establish a speech communication from the cabin
with the SERVICE INTERPHONE JACKS, the SERVice key on
the cabin attendant HANDSET must be pressed.
The message "SERV INT" is displayed on the calling
station AIP.
On all other ATTENDANT INDICATION PANELs, the steady
"SERV INT IN USE" message appears.
The audio signals are digitized through the Type B
Decoder Encoder Units and transmitted through the MID
DATA BUS LINES to the DIRECTORS.
After conversion to analog signals, they are
transmitted to the JACKS through audio lines.
NOTE: When the CAB and INT keys are pressed
(respectively on the ACPs in the cockpit and on
the handset in the cabin), speech communications
can be established between the cockpit, the cabin
stations and the JACKS.
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SERVICE INTERPHONE D/O
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23 - COMMUNICATIONS
23-73-00 PASSENGER CALL SYSTEM D/O
CONTENTS:
General
Passenger to Cabin Attnd Call from Passenger Seat
Passenger to Cabin Attnd Call from Lavatories
Options
TMUCI2T03 LEVEL 3
EFFECTIVITY 23-73-00 Page 1
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PASSENGER CALL SYSTEM D/O
GENERAL
At CIDS power up a general call reset will be initiated.
Any call initiated from a passenger seat or a lavatory
activates aural and visual indications.
If no passenger call is made during boarding time, all
seat row numbering lights will be steadily illuminated.
If a passenger call is made during boarding time, the
respective seat row numbering light will flash.
PASSENGER TO CABIN ATTND CALL FROM PASSENGER SEAT (ONE
CABIN ZONE)
Basic version
When a passenger seat PAX call pushbutton is pressed
on the PSU, the following happens:
- the associated seat row numbering light comes
on,
- a high 1 chime is broadcast over all attendant
and passenger loudspeakers,
- the blue light on all ACPs comes on steady.
If several pushbuttons are pressed simultaneously, a
maximum of three chimes sound. The call indications
associated with an activated pushbutton are reset when
the same pushbutton is pressed a second time.
PASSENGER TO CABIN ATTND CALL FROM LAVATORIES (ONE
CABIN ZONE)
Basic version
Call to Attendants from Lavatories
When a lavatory call pushbutton is pressed, the
following happens:
- the integrated call light comes on,
- a chime is broadcast over all attendants and
passenger loudspeakers,
- the amber light comes on steady on the
respective ACP,
　
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