-
The SVCE INT OVRD pushbutton switch 15RJ
-
The annunciator-light test and interface board 1LP
-
The CIDS directors 101RH and 102RH.
If there is a short-circuit condition in a maintenance-interphone jack-socket, the isolation unit will keep the effects of the failure on the service interphone system to a minimum.
**ON A/C ALL
4. Operation/Control and Indication
________________________________
**ON A/C 001-049, 051-099, 101-105, 151-199, 201-299,
(Ref. Fig. 002)
R **ON A/C 106-149, 301-399, 401-499,
(Ref. Fig. 002A)
**ON A/C ALL
The service interphone system operates automatically when the aircraft is on the ground (nose landing gear compressed) with/without the external power is available. In this case both LGCIUs give ground signals to the CIDS directors.
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Service Interphone System - Component Location
Figure 001A (SHEET 1)
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Service Interphone System - Component Location
Figure 001A (SHEET 2)
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Service Interphone System - Schematic Diagram
Figure 002
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INTENTIONALLY BLANK
1 1
23-44-00Page 9
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Service Interphone System - Schematic Diagram
Figure 002A (SHEET 1)
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Service Interphone System - Schematic Diagram
Figure 002A (SHEET 2)
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R
R
R
When on the MCDU the nose landing gear is in flight simulation or the landing gear is not compressed (flight condition) both LGCIUs give no ground signals to the CIDS directors. The service interphone system operates, when you push the SVCE INT OVRD pushbutton switch 15RJ to the ON position. The integral indicator light in the SVCE INT OVRD pushbutton switch 15RJ comes on.
The system is off when:
-
On the MCDU the nose landing gear is in flight simulation or the landing gear is not compressed, and the SVCE INT OVRD pushbutton switch 15RJ is off.
A.
Operation from the Cockpit The acoustic equipment in the cockpit sends the audio signals to the Audio Management Unit (AMU). The AMU sends the audio signals through the audio lines to the CIDS directors. The active CIDS director sends the audio signals to:
-
The attendant stations through the mid bus lines
-
The maintenance interphone jacks through the audio lines.
B.
Operation from the Cabin Attendant Stations The operation starts when you push the service interphone key on the attendant handset. The cabin attendant stations send the audio signals through the mid bus lines to the CIDS directors. The active CIDS director sends the audio signals to:
-
The cockpit acoustic equipment through the audio lines and the AMU
-
The maintenance interphone jacks through the audio lines.
C.
Operation from a Service Interphone Jack with a connected Boomset The boomset sends the audio signals through the audio lines to the CIDS directors. The active CIDS director sends the audio signals to:
-
The cockpit acoustic equipment through the audio lines and the AMU
-
The attendant stations through the mid bus lines
-
The maintenance interphone jacks through the audio lines.
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R CABIN AND SERVICE INTERPHONE - MAINTENANCE PRACTICES____________________________________________________ TASK 23-44-00-860-001 Operation of the Service Interphone System
1.
Reason for the Job
__________________
Self Explanatory
2.
Job Set-up Information
______________________
A. Fixtures, Tools, Test and Support Equipment
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