Operational Test of the Service Interphone

TASK 23-44-00-700-001-A
Operational Test of the Service Interphone

WARNING: MAKE SURE THAT ALL THE CIRCUITS IN MAINTENANCE ARE ISOLATED BEFORE YOU SUPPLY ELECTRICAL POWER TO THE AIRCRAFT. UNWANTED ELECTRICAL POWER CAN BE DANGEROUS.

WARNING: YOU MUST BE IN THE ENTRY CORRIDOR (SAFETY AREA) TO DO THIS PROCEDURE. THIS IS TO PREVENT ACCIDENTS CAUSED BY THE BLAST OR SUCTION FROM THE ENGINES. FOR SAFETY, YOU MUST NOT USE THE MOBILE EQUIPMENT.

WARNING: BEFORE YOU OPEN PHC CIRCUIT BREAKERS 2DA1(2,3), OPEN PROBE HEATER CIRCUIT-BREAKERS 1DA1(2), 3DA1(2,3), 4DA1(2,3) AND 5DA1(2,3). IF YOU DO NOT OBEY THIS SEQUENCE: - THE PROBES WILL BECOME TOO HOT. - THIS CAN CAUSE DAMAGE TO EQUIPMENT AND INJURY TO MAINTENANCE PERSONNEL.

NOTE: Three persons are necessary to perform this test.

ZONE: 120
ZONE: 122
ZONE: 138
ZONE: 210
ZONE: 221
ZONE: 312
ZONE: 410
ZONE: 420
FIN: 1RJ
FIN: 11RJ
FIN: 13RJ
FIN: 14RJ
FIN: 15RJ
FIN: 2RJ
FIN: 3RJ
FIN: 4000RJ1 ** ON A/C NOT FOR ALL
FIN: 4000RJ2 ** ON A/C NOT FOR ALL

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
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER

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
210	CKPT,FWD COMPT BHD TO FLT COMPT BULKHEAD
221	FWD CAB UTILITY AREA
312	AFT FUSLG TAIL SECTION
410	ENG 1 PYLON BOX AND FORWARD FAIRING
420	ENG 2 PYLON BOX AND FORWARD FAIRING

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 23-44-00-860-050-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).
(3) Make sure that the aircraft is in ground condition (landing gear compressed).
(4) Make sure that the INT/RAD selector switches of the Audio Control Panels (ACPs) are in the center position.
(5) On the captain jack panel, connect the first of the BOOMSET 600 OHMS to the related connector.

Subtask 23-44-00-865-050-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 ALL
49VU	L/G/LGCIU/SYS1/NORM	1GA	C09
49VU	FWS/FWC1/SPLY	3WW	F01
** 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
121VU	HYDRAULIC/LGCIU/SYS2	2GA	Q35
121VU	HYDRAULIC/LGCIU/SYS1/GRND SPLY	52GA	Q34
121VU	EIS/FWC2/SPLY	2WW	Q07

Subtask 23-44-00-865-059-A

C. Open, safety and tag these circuit breakers in this sequence:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
FOR FIN: 9DA1 (PROBEPITOT, 1)
122VU	ANTI ICE/PROBES/1/TAT	1DA1	Z12
49VU	ANTI ICE/PROBES/PITOT/1	3DA1	D02
49VU	ANTI ICE/PROBES/AOA/1	4DA1	D04
122VU	ANTI ICE/PROBES/1/STATIC	5DA1	Z13
FOR FIN: 9DA2 (PROBEPITOT, 2)
122VU	ANTI ICE/PROBES/2/TAT	1DA2	Y15
122VU	ANTI ICE/PROBES/2/PITOT	3DA2	Y14
122VU	ANTI ICE/PROBES/2/AOA	4DA2	Y13
122VU	ANTI ICE/PROBES/2/STATIC	5DA2	Y11
FOR FIN: 9DA3 (PROBEPITOT, 3)
122VU	ANTI ICE/PROBES/3/PITOT	3DA3	Z16
122VU	ANTI ICE/PROBES/3/AOA	4DA3	Z15
122VU	ANTI ICE/PROBES/3/STATIC	5DA3	Z14

Subtask 23-44-00-865-060-A

D. Open, safety and tag these circuit breakers in this sequence:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
FOR FIN: 9DA1 (PROBEPITOT, 1)
49VU	ANTI ICE/PROBES/PHC/1	2DA1	D03
FOR FIN: 9DA2 (PROBEPITOT, 2)
122VU	ANTI ICE/PROBES/PHC/2	2DA2	Y12
FOR FIN: 9DA3 (PROBEPITOT, 3)
122VU	ANTI ICE/PROBES/PHC/3	2DA3	Y16

4. Procedure
Subtask 23-44-00-710-050-B ** ON A/C NOT FOR ALL

A. Operational Test of the Service Interphone

ACTION	RESULT
1.In the cockpit, on captain's Audio-Control-Panel (ACP) 2RN1:	In the cockpit, on captain's ACP 2RN1:
Push the CAB pushbutton switch.	The green internal light of the CAB pushbutton switch comes on.
Push the CAB rotary switch and turn it fully clockwise.	The internal light of the CAB rotary switch comes on.
2.In the forward electronics compartment:	In the cabin, at all Attendant Indication Panels (AIP) 320RH:
Connect the second service interphone boomset to service interphone jack 1RJ.	All AIP 320RH show the message "SVCE INTPH AVAIL" on the lower row. NOTE: With some service interphone boomsets, it is necessary to key the microphone manually.
3.In the cockpit, on captain's ACP 2RN1:	In the forward electronics compartment and in the cockpit:
Set and hold the INT/RAD selector switch in the RAD position.
Speak into the cockpit boomset and the service interphone boomset in the forward electronics compartment. NOTE: It is necessary to hold the INT/RAD selector switch in the RAD position when you speak into the cockpit boomset.	The announcement through the related boomsets is correct and clear. Make sure that you do not hear a 400Hz interference. NOTE: A small 400Hz interference is permitted.
Release the INT/RAD selector switch.
4.At the forward attendant station, zone 221:	In the cabin, at forward attendant AIP 320RH, the AIP shows the subsequent messages:
Lift the handset from the cradle.	Upper row: "#" Lower row: "SVCE INTPH AVAIL".
5.At the forward attendant station, zone 221:	In the cabin, at forward attendant AIP 320RH, the AIP shows the subsequent messages:
Push the INTPH pushbutton two times.	Upper row: "SVCE INTPH AVAIL".
6.At the forward attendant station, zone 221:	In the forward electronics compartment and at the forward attendant station, zone 221:
Push the PTT switch and speak into the handset.	The announcement through the boomset and the handset is correct and clear. Make sure that you do not hear a 400Hz interference. NOTE: A small 400Hz interference is permitted. NOTE: It is necessary to complete the test steps 7. thru 12. in less than 30 seconds.
7.On circuit breaker panel 121VU:
Open circuit breakers 2GA and 52GA.
8.On circuit breaker panel 49VU:	In the forward electronics compartment and at the forward attendant station, zone 221:
Open circuit breaker 1GA.	You cannot speak from the forward electronics compartment to a person at the forward attendant station, zone 221. The person at the forward attendant station, zone 221 cannot speak to you at the forward electronics compartment.
9.In the cockpit, on panel 50VU:	In the cockpit, on panel 50VU:
Push SVCE INT OVRD pushbutton switch 15RJ.	The internal light of SVCE INT OVRD pushbutton switch 15RJ comes on.
10.In the cockpit, on captain's ACP 2RN1:	In the forward electronics compartment and in the cockpit:
Set and hold the INT/RAD selector switch in the RAD position.
Speak into the cockpit boomset and the service interphone boomset in the forward electronics compartment.	The announcement through the related boomsets is correct and clear. Make sure that you do not hear a 400Hz interference. NOTE: A small 400Hz interference is permitted.
Release the INT/RAD selector switch.
11.On circuit breaker panel 121VU:	In the cockpit, on panel 50VU:
Close circuit breakers 2GA and 52GA.	Internal light of the SVCE INT OVRD pushbutton switch 15RJ goes off.
12.On circuit breaker panel 49VU:
Close circuit breaker 1GA.
13.Do the test steps 3. and 4. again for all other service interphone jacks.	The same results as in the test steps 3. and 4. for the related service interphone jacks.
14.In the cockpit, on captain's ACP 2RN1:	In the cockpit, on captain's ACP 2RN1:
Push the CAB pushbutton switch.	The internal light of the CAB pushbutton switch goes off.
Push the CAB rotary switch and turn it fully counterclockwise.	The internal light of the CAB rotary switch goes off.
15.At the related service interphone jack:	In the cabin at all AIP 320RH:
Disconnect the service interphone boomsets.	The "SVCE INTPH AVAIL" message goes out of view.

Subtask 23-44-00-710-050-C ** ON A/C NOT FOR ALL

A. Operational Test of the Service Interphone

ACTION	RESULT
1.In the cockpit, on captain's Audio-Control-Panel (ACP) 2RN1:	In the cockpit, on captain's ACP 2RN1:
Push the "CAB" pushbutton switch.	The green internal light of the "CAB" pushbutton switch comes on.
Push the "CAB" rotary switch and turn it fully clockwise.	The internal light of the "CAB" rotary switch comes on.
2.In the forward electronics compartment:	In the cabin, at all Attendant Indication Panels (AIP) 320RH:
Connect the second service interphone boomset to the service interphone jack 1RJ.	All AIP 320RH show the message "SERVICE INTERPHONE IN USE" on the lower row. NOTE: With some service interphone boomsets, it is necessary to key the microphone manually.
3.In the cockpit, on the captain's ACP 2RN1:	In the forward electronics compartment and in the cockpit:
Set and hold the "INT/RAD" selector switch in the "RAD" position.
Speak into the cockpit boomset and the service interphone boomset in the forward electronics compartment. NOTE: You must hold the "INT/RAD" selector switch in the "RAD" position when you speak into the cockpit boomset.	The announcement through the related boomsets is correct and clear. Make sure that you do not hear a 400Hz interference. NOTE: A small 400Hz interference is permitted.
Release the "INT/RAD" selector switch.
4.At the forward attendant station, zone 221:	In the cabin, at the forward attendant AIP 320RH, the AIP shows the subsequent messages:
Lift the handset from the cradle.	upper row: "#" lower row: "SERVICE INTERPHONE IN USE".
5.At the forward attendant station, zone 221:	In the cabin, at the forward attendant AIP 320RH, the AIP shows the subsequent messages:
Push the "INTPH" pushbutton two times.	upper row: "SERV INT" lower row: "#"
6.At the forward attendant station, zone 221:	In the forward electronics compartment and at the forward attendant station, zone 221:
Speak into the handset.	The announcement through the boomset and the handset is correct and clear. Make sure that you do not hear a 400Hz interference. NOTE: A small 400Hz interference is permitted. NOTE: You must complete the test steps 7. thru 12. in less than 30 seconds.
7.On the circuit breaker panel 121VU:
Open the circuit breakers 2GA and 52GA.
8.On the circuit breaker panel 49VU:	In the forward electronics compartment and at the forward attendant station, zone 221:
Open the circuit breaker 1GA.	You cannot speak from the forward electronics compartment to a person at the forward attendant station, zone 221, The person at the forward attendant station, zone 221 cannot speak to you at the forward electronics compartment.
9.In the cockpit, on the panel 50VU:	In the cockpit, on the panel 50VU:
Push the "SVCE INT OVRD" pushbutton switch 15RJ.	The internal light of the "SVCE INT OVRD" pushbutton switch 15RJ comes on.
10.In the cockpit, on the captain's ACP 2RN1:	In the forward electronics compartment and in the cockpit:
Set and hold the "INT/RAD" selector switch in the "RAD" position.
Speak into the cockpit boomset and the service interphone boomset in the forward electronics compartment.	The announcement through the related boomsets is correct and clear. Make sure that you do not hear a 400Hz interference. NOTE: A small 400Hz interference is permitted.
Release the "INT/RAD" selector switch.
11.On the circuit breaker panel 121VU:	In the cockpit, on the panel 50VU:
Close the circuit breakers 2GA and 52GA.	The internal light of the "SVCE INT OVRD" pushbutton switch 15RJ goes off.
12.On the circuit breaker panel 49VU:
Close the circuit breaker 1GA.
13.Do the test steps 3. and 4. again for all other service interphone jacks.	The same results as in the test steps 3. and 4. for the related service interphone jacks.
14.In the cockpit, on the captain's ACP 2RN1:	In the cockpit, on the captain's ACP 2RN1:
Push the "CAB" pushbutton switch.	The internal light of the "CAB" pushbutton switch goes off.
Push the "CAB" rotary switch and turn it fully counterclockwise.	The internal light of the "CAB" rotary switch goes off.
15.At the related service interphone jack:	In the cabin at all AIP 320RH:
Disconnect the service interphone boomset.	The "SERVICE INTERPHONE IN USE" message goes out of view.

Subtask 23-44-00-865-052-A

B. Open, safety and tag this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	COM/CIDS/DIR ESS/2	157RH	G02
** ON A/C NOT FOR ALL
49VU	COM/CIDS/DIR ESS/1	150RH	G01
** ON A/C NOT FOR ALL
49VU	COM DIR ESS/2	157RH	G02
** ON A/C NOT FOR ALL
49VU	COM NAV/CIDS/DIR2 ESS	157RH	G02
49VU	COM NAV/CIDS/DIR1 ESS	150RH	G01
** ON A/C NOT FOR ALL
121VU	COM NAV/CIDS/DIR NORM/2	156RH	M06
121VU	COM NAV/CIDS/DIR NORM/1	151RH	M05
** ON A/C NOT FOR ALL
121VU	COM NAV/CIDS/DIR NORM/2	156RH	M07
121VU	COM NAV/CIDS/DIR NORM/1	151RH	M06
** ON A/C NOT FOR ALL
121VU	COM NAV/CIDS/DIR2 NORM	156RH	M06
121VU	COM NAV/CIDS/DIR1 NORM	151RH	M05

Subtask 23-44-00-865-053-A

C. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	COM/CIDS/DIR ESS/2	157RH	G02
** ON A/C NOT FOR ALL
49VU	COM DIR ESS/2	157RH	G02
** ON A/C NOT FOR ALL
49VU	COM NAV/CIDS/DIR2 ESS	157RH	G02
** ON A/C NOT FOR ALL
121VU	COM NAV/CIDS/DIR NORM/2	156RH	M06
** ON A/C NOT FOR ALL
121VU	COM NAV/CIDS/DIR NORM/2	156RH	M07
** ON A/C NOT FOR ALL
121VU	COM NAV/CIDS/DIR2 NORM	156RH	M06

Subtask 23-44-00-865-054-A

D. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	COM/CIDS/DIR ESS/1	150RH	G01
** ON A/C NOT FOR ALL
49VU	COM NAV/CIDS/DIR1 ESS	150RH	G01
** ON A/C NOT FOR ALL
121VU	COM NAV/CIDS/DIR NORM/1	151RH	M05
** ON A/C NOT FOR ALL
121VU	COM NAV/CIDS/DIR NORM/1	151RH	M06
** ON A/C NOT FOR ALL
121VU	COM NAV/CIDS/DIR1 NORM	151RH	M05

Subtask 23-44-00-865-061-A

E. Remove the safety clips and tags and close these circuit breakers in this sequence:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
FOR FIN: 9DA1 (PROBEPITOT, 1)
49VU	ANTI ICE/PROBES/PHC/1	2DA1	D03
FOR FIN: 9DA2 (PROBEPITOT, 2)
122VU	ANTI ICE/PROBES/PHC/2	2DA2	Y12
FOR FIN: 9DA3 (PROBEPITOT, 3)
122VU	ANTI ICE/PROBES/PHC/3	2DA3	Y16

Subtask 23-44-00-865-062-A

F. Remove the safety clips and tags and close these circuit breakers in this sequence:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
FOR FIN: 9DA1 (PROBEPITOT, 1)
122VU	ANTI ICE/PROBES/1/TAT	1DA1	Z12
49VU	ANTI ICE/PROBES/PITOT/1	3DA1	D02
49VU	ANTI ICE/PROBES/AOA/1	4DA1	D04
122VU	ANTI ICE/PROBES/1/STATIC	5DA1	Z13
FOR FIN: 9DA2 (PROBEPITOT, 2)
122VU	ANTI ICE/PROBES/2/TAT	1DA2	Y15
122VU	ANTI ICE/PROBES/2/PITOT	3DA2	Y14
122VU	ANTI ICE/PROBES/2/AOA	4DA2	Y13
122VU	ANTI ICE/PROBES/2/STATIC	5DA2	Y11
FOR FIN: 9DA3 (PROBEPITOT, 3)
122VU	ANTI ICE/PROBES/3/PITOT	3DA3	Z16
122VU	ANTI ICE/PROBES/3/AOA	4DA3	Z15
122VU	ANTI ICE/PROBES/3/STATIC	5DA3	Z14

5. Close-up
Subtask 23-44-00-860-051-A

A. Put the aircraft back to its initial configuration.
(1) De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002).

[Rev.10 from 2021] 2026.04.01 04:14:20 UTC