Operation of the Service Interphone System

TASK 23-44-00-860-001-A
Operation of the Service Interphone System

ZONE: 120
ZONE: 122
ZONE: 138
ZONE: 200
ZONE: 312
FIN: 1RJ
FIN: 11RJ
FIN: 13RJ
FIN: 14RJ
FIN: 15RJ
FIN: 2RJ
FIN: 3RJ

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	BOOMSET 600 OHMS

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
120	AVIONICS COMPARTMENT
122	AVIONICS COMPARTMENT
138	BAY BETW AFT PART. BULKHEAD OF FWD CARGO
200	UPPER HALF FUSELAGE
312	AFT FUSLG TAIL SECTION

C. Referenced Information

REFERENCE	DESIGNATION
TASK 23-73-00-861-001-A	Energize the Cabin Intercommunication Data System (CIDS)
TASK 24-41-00-861-002-A	Energize the Aircraft Electrical Circuits from the External Power
TASK 24-41-00-861-002-A-01	Energize the Aircraft Electrical Circuits from the APU
TASK 24-41-00-861-002-A-02	Energize the Aircraft Electrical Circuits from Engine 1(2)
TASK 24-41-00-862-002-A	De-energize the Aircraft Electrical Circuits Supplied from the External Power
TASK 24-41-00-862-002-A-01	De-energize the Aircraft Electrical Circuits Supplied from the APU
TASK 24-41-00-862-002-A-02	De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2)

3. Job Set-up
Subtask 23-44-00-860-052-A

A. Aircraft Maintenance Configuration
(1) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).
(2) Make sure that the Cabin Intercommunication Data System (CIDS) is energized (Ref. AMM TASK 23-73-00-861-001).

Subtask 23-44-00-865-051-A

B. Make sure that this(these) circuit breaker(s) is(are) closed:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	COM/AUDIO/ACP/F/O	5RN	G07
** ON A/C NOT FOR ALL
49VU	COM/AUDIO/FLT/INTPH	9RN	G08
49VU	COM/AUDIO/ACP/CAPT	4RN	G06
** ON A/C NOT FOR ALL
49VU	COM/ACP F/O/BITE/ INT 2 AUDIO/3&5 OCCPNT	5RN	G07
** ON A/C NOT FOR ALL
49VU	COM/INT/1+2	9RN	G08
49VU	COM/ACP CAPT/SELCAL/INT 1 AUDIO/AVNCS	4RN	G06
** ON A/C ALL
121VU	COM NAV/SELCAL	8RN	M04
121VU	COM NAV/ACP/THIRD/OCCPNT	6RN	M02

4. Procedure
Subtask 23-44-00-860-053-A

A. Operation of the Service Interphone System
(1) Connect the BOOMSET 600 OHMS to the related connectors.
(2) In the cockpit on the overhead panel 50VU push the SVCE INT OVRD pushbutton switch 15RJ.

NOTE: It is only necessary to push the SVCE INT OVRD pushbutton switch when the nose landing gear is not compressed (e.g.: nose landing gear is in flight simulation or the A/C is jacked).

(3) Put the INT/RAD switches of all Audio Control Panels (ACPs) in the center position.
(4) Push the CAB pushbutton switch of the related ACP (integral light on).
(5) Push to release and turn the CAB knob of the related ACP fully clockwise.
(6) The service interphone system operates.

NOTE: On the related ACP put and hold the INT/RAD switch in the RAD position while you speak.

5. Close-up
Subtask 23-44-00-860-054-A

A. Put the aircraft back to its initial configuration.
(1) On the ACP push the CAB knob.
(2) In the cockpit push the SVCE INT OVRD pushbutton switch to off.
(3) Disconnect the boomsets.
(4) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).

[Rev.10 from 2021] 2026.04.01 12:41:41 UTC