Operational Test of the CVR Recording Logic Including Time Delay Relay

TASK 23-71-00-710-002-A
Operational Test of the CVR Recording Logic Including Time Delay Relay

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: This procedure is applicable to the CVR and the SSCVR.

NOTE: During the test, it is possible that you will hear an audio signal related to the synchronization with the second recorder (SSFDR). You can ignore it.

ZONE: 210

1. Reason for the Job
Refer to the MPD TASK: 237100-02
OPERATIONAL CHECK OF CVR RECORDING LOGIC INCLUDING TIME DELAY RELAY
To do a check of the FLT/GND power supply of the CVR.
To do a check of the CVR power supply through the engines.
To make sure that the CVR PWR CUT OFF RELAY 10RK operates correctly.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	HEADSET 600 OHMS
No specific	AR	STOPWATCH

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
210	CKPT,FWD COMPT BHD TO FLT COMPT BULKHEAD

C. Referenced Information

REFERENCE	DESIGNATION
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 23-71-00-860-053-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Wait for a minimum of five minutes after the engines were stopped.
(2) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).
(3) Make sure that the PARK BRK control handle is in the ON position.
(4) Make sure that the aircraft is in the ground configuration.
(5) On maintenance panel 50VU, connect a HEADSET 600 OHMS to the CVR/HEAD SET connector.

Subtask 23-71-00-865-053-A ** ON A/C NOT FOR ALL

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	COM/CVR/SPLY	2RK	E14
49VU	COM/CVR/CTL	4RK	E13
** ON A/C NOT FOR ALL
49VU	ENGINE/2/FADEC A/AND EIU 2	2KS2	A05
49VU	ENGINE/1/FADEC A/AND EIU 1	2KS1	A04
49VU	ENGINE/1 AND 2/IGN/SYS A	1JH	A03
** ON A/C NOT FOR ALL
49VU	COM/CVR/SPLY	23RK	E14
49VU	COM/CVR/CTL	26RK	E13
** ON A/C NOT FOR ALL
121VU	ENGINE/IGN/ENG2/SYS A BAT	2JH2	P40
121VU	ENGINE/IGN/ENG1/SYS A BAT	2JH1	P39
121VU	ENGINE/ENG2/FADEC B	4KS2	Q40
** ON A/C NOT FOR ALL
121VU	ENGINE/IGN/ENG2/SYS B	3JH2	P42
121VU	ENGINE/IGN/ENG1/SYS B	3JH1	P41
121VU	ENGINE/ENG1/FADEC B/AND EIU 1	4KS1	R41
** ON A/C NOT FOR ALL
121VU	ENGINE/ENG2/FADEC B/AND EIU2	4KS2	Q40

Subtask 23-71-00-865-054-A ** ON A/C NOT FOR ALL

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR 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 23-71-00-865-055-A ** ON A/C NOT FOR ALL

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR 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 23-71-00-710-052-A ** ON A/C NOT FOR ALL

A. Test of the FLT/GND power supply of the CVR

NOTE: Before this test, you can hear an audio signal related to the synchronization with the 2nd recorder (SSFDR). You can ignore this audio signal.

ACTION	RESULT
1.Make sure that you cannot hear the cockpit conversations in the headset.
2.On the overhead panel, on panel 21VU:	On panel 21VU, on the RCDR/GND CTL pushbutton switch:
Push the RCDR/GND CTL pushbutton switch.	The ON legend comes on. You can hear the conversations from the CVR microphone in the headset.
Push the RCDR/GND CTL pushbutton switch.	The ON legend goes off. In the headset, you cannot hear the conversations.

Subtask 23-71-00-710-053-A ** ON A/C NOT FOR ALL

WARNING: MAKE SURE THAT YOU OPEN THE CIRCUIT BREAKERS AS FOLLOWS:

1JH, 2JH2 AND 3JH2 BEFORE 2KS2.

IF YOU DO NOT OBEY THIS SEQUENCE, THERE IS A RISK OF ELECTROCUTION. THIS IS BECAUSE YOU WILL START CONTINUOUS IGNITION IF YOU OPEN CIRCUIT BREAKER 2KS2 FIRST.

B. Test of the Power Supply of the CVR through the engines

ACTION	RESULT
1.Make sure that you cannot hear the cockpit conversations in the headset.
2.On the rear panel, on panel 121VU: Open circuit breakers 2JH1, 3JH1, 2JH2 and 3JH2.
3.On the overhead panel, on panel 49VU:
Open circuit breaker 1JH then circuit breakers 2KS1 and 2KS2.	In the headset, you can hear the conversations from the CVR microphone.
4.On panel 121VU: Open circuit breakers 4KS1 and 4KS2.
5.On panels 49VU and 121VU:
Close circuit breakers 2KS1, 2KS2, 4KS1 and 4KS2, and then close circuit breakers 1JH, 2JH1, 3JH1, 2JH2 and 3JH2.
Start the STOPWATCH.	You can hear the conversations from the CVR microphone in the headset for 5 minutes. Then you cannot hear the cockpit conversations.

Subtask 23-71-00-710-052-B ** ON A/C NOT FOR ALL

C. Operational Test of the FLT/GND Power Supply of the CVR (6RK)

NOTE: During the test, it is possible that you will hear your voice in the headset.

NOTE: During the test, if there is an acoustic feedback (Larsen effect), you can do the test of the CVR through jack headset 22RK and with the parking brake set to off. Then, installed wheel chocks or brakes applied are necessary conditions before you set the parking brake to off and start the test. After you complete the test, it will be necessary to set the parking brake back to on.

ACTION	RESULT
1.On the overhead panel, on panel 21VU: Push the CVR TEST pushbutton switch for a maximum of 6 seconds and release it.	There is no tone in the headset.
2.On panel 21VU: Push the RCDR/GND CTL pushbutton switch.	On panel 21VU, on the RCDR/GND CTL pushbutton switch: The ON legend comes on.
3.On panel 21VU: Push the CVR TEST pushbutton switch until you hear a tone or for a maximum of 6 seconds.	You can hear a tone in the headset connected to the CVR.
4.On panel 21VU: Push the RCDR/GND CTL pushbutton switch.	On panel 21VU, on the RCDR/GND CTL pushbutton switch: The ON legend goes off.

Subtask 23-71-00-710-053-B ** ON A/C NOT FOR ALL

D. Operational Test of Power Supply Relay 8RK and Time Delay Power Cut-Off Relay 10RK of the CVR through the Engines

NOTE: A stopwatch is necessary to measure the time in the cockpit.

NOTE: During the test, it is possible that you will hear your voice in the headset.

ACTION	RESULT
1.On the overhead panel, on panel 21VU: Push the CVR TEST pushbutton switch for a maximum of 6 seconds and release it.	There is no tone in the headset.
2.On the overhead panel, on panel 49VU: Open circuit breaker 2KS1.
3.On the rear panel, on panel 121VU: Open circuit breaker 4KS1.
4.On panel 21VU: Push the CVR TEST pushbutton switch until you hear a tone or for a maximum of 6 seconds.	You can hear a tone in the headset connected to the CVR. NOTE: The test of relay 8RK is satisfactory.
5.On panel 49VU: Close circuit breaker 2KS1.
6.On panel 121VU: Close circuit breaker 4KS1.
7.Immediately, start the STOPWATCH in the cockpit.
8.On panel 21VU:
Wait 4 minutes then push the CVR TEST pushbutton switch until you hear a tone or for a maximum of 6 seconds.	You can hear a tone in the headset connected to the CVR.
Wait 2 more minutes then push the CVR TEST pushbutton switch for a maximum of 6 seconds.	There is no tone in the headset. NOTE: The test of relay 10RK is satisfactory.

Subtask 23-71-00-710-054-A ** ON A/C NOT FOR ALL

E. Test of the CVR PWR CUT OFF RELAY (10RK).

NOTE: During the test, if there is an acoustic feedback (Larsen effect), you can do the test of the CVR through jack headset 22RK and with the parking brake set to OFF. Then, installed wheel chocks or brakes applied are necessary conditions before you set the parking brake to off and start the test. After you complete the test, it will be necessary to set the parking brake back to ON.

ACTION	RESULT
1.On the overhead panel, on panel 49VU:
Open circuit breaker 4RK. Close circuit breaker 4RK.
Start the STOPWATCH.	You can hear the conversations from the CVR microphone in the headset for 5 minutes. Then you cannot hear the cockpit conversations.

Subtask 23-71-00-710-054-C ** ON A/C NOT FOR ALL

E. Test of the CVR PWR CUT OFF RELAY (10RK).

NOTE: During the test, it is possible that you will hear your voice in the headset.

ACTION	RESULT
1.On the overhead panel, on panel 49VU:
Open circuit breaker 26RK. Close circuit breaker 26RK.
2.Immediately, start the STOPWATCH in the cockpit.
3.On the overhead panel, on panel 21VU:
Wait 4 minutes then push the CVR TEST pushbutton switch until you hear a tone or for a maximum of 6 seconds.	You can hear the CVR TEST tone in the headset.
Wait 2 more minutes then push the CVR TEST pushbutton switch for a maximum of 6 seconds.	You cannot hear the CVR TEST tone in the headset. NOTE: The test of relay 10RK is satisfactory.

Subtask 23-71-00-865-056-A ** ON A/C NOT FOR ALL

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR 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 23-71-00-865-057-A ** ON A/C NOT FOR ALL

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR 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 23-71-00-860-052-A ** ON A/C NOT FOR ALL

A. Put the aircraft back to its initial configuration.
(1) Disconnect the headset from the CVR/HEAD SET connector.
(2) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).

[Rev.10 from 2021] 2026.03.31 23:16:03 UTC