Operational Check of CVR Recording Logic Including Time Delay Relay

TASK 23-71-00-710-002-B
Operational Check of 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 Cockpit Voice Recorder (CVR) and the Solid State Cockpit Voice Recorder (SSCVR).

NOTE: During the test, it is possible that you hear an audio signal related to the synchronization with the second recorder (Solid State Flight Data 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 flight or ground power supply of the CVR.
To do a check of the CVR power supply to the engines.
To make sure that recorder power-delay relays 46TU (for ENG1) and 45TU (for ENG2) operate correctly.
To make sure that oil low pressure and ground relay 10KS1 (for ENG1) operates correctly for the logic related to relay 46TU.
To make sure that oil low pressure and ground relay 12KS2 (for ENG2) operates correctly for the logic related to relay 45TU.
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 23-71-00-860-089-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 the HEADSET 600 OHMS to the CVR/HEADSET connector.

Subtask 23-71-00-865-080-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	23RK	E14
49VU	COM/CVR/CTL	26RK	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
** ON A/C NOT FOR ALL
49VU	RCDR1 CVR&FDR	40TU	E14
49VU	RCDR CTL	41TU	E13
** ON A/C NOT FOR ALL
121VU	ENGINE/ENG2/FADEC B/AND EIU2	4KS2	Q40
121VU	ENGINE/ENG1/FADEC B/AND EIU 1	4KS1	R41
** ON A/C NOT FOR ALL
121VU	ENGINE/ENG2/FADEC B/AND EIU2	4KS2	R41
121VU	ENGINE/ENG1/FADEC B/AND EIU 1	4KS1	R40

Subtask 23-71-00-865-081-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 23-71-00-865-082-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 23-71-00-710-062-A ** ON A/C NOT FOR ALL

A. Operational Test of the Recorder Power-Flight Control-Relay (23TU)

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

During the test, if you hear a sound (Larsen effect), do the test of the CVR with headset jack 22RK and the parking brake set to OFF. Before you set the parking brake to OFF and start the test, install the wheel chocks or apply the brakes.
After you complete the test, 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 six seconds and then release it.	There is no tone in the headset.
2.On panel 21VU: Push the RCDR/GND CTL/AUTO pushbutton switch.	On panel 21VU, on the RCDR/GND CTL/AUTO 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 six seconds.	You can hear a tone in the headset connected to the CVR.
4.On panel 21VU: Push the RCDR/GND CTL/AUTO pushbutton switch.	On panel 21VU, on the RCDR/GND CTL/AUTO pushbutton switch: The ON legend goes off.

Subtask 23-71-00-710-063-A ** ON A/C NOT FOR ALL

B. Operational Test of Recorder-Power ENG1 Control-Relay 24TU, Time Delay of Recorder-Power ENG1 Delay-Relay 46TU of the CVR with Engine 1 and the Related Logic of Oil Low Pressure and Ground Relay 10KS1

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

NOTE: During the test, it is possible that you 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 six seconds and then 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 six seconds.	You can hear a tone in the headset connected to the CVR. NOTE: The test of relay 24TU 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 for four minutes. Then, push the CVR TEST pushbutton switch until you hear a tone or for a maximum of six seconds.	You can hear a tone in the headset connected to the CVR.
Wait again for two minutes. Then, push the CVR TEST pushbutton switch for a maximum of six seconds.	There is no tone in the headset. NOTE: The test of relay 46TU is satisfactory with the related logic of relay 10KS1.

Subtask 23-71-00-710-065-A ** ON A/C NOT FOR ALL

C. Operational Test of Recorder-Power ENG2 Control-Relay 22TU, Time Delay of Recorder-Power ENG2 Delay-Relay 45TU of the CVR with Engine 2 and the Related Logic of Oil Low Pressure and Ground Relay 12KS2

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

NOTE: During the test, it is possible that you 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 six seconds and then release it.	There is no tone in the headset.
2.On the overhead panel, on panel 49VU: Open circuit breaker 2KS2.
3.On the rear panel, on panel 121VU: Open circuit breaker 4KS2.
4.On panel 21VU: Push the CVR TEST pushbutton switch until you hear a tone or for a maximum of six seconds.	You can hear a tone in the headset connected to the CVR. NOTE: The test of relay 22TU is satisfactory.
5.On panel 49VU: Close circuit breaker 2KS2.
6.On panel 121VU: Close circuit breaker 4KS2.
7.Immediately start the STOPWATCH in the cockpit.
8.On panel 21VU:
Wait for four minutes. Then, push the CVR TEST pushbutton switch until you hear a tone or for a maximum of six seconds.	You can hear a tone in the headset connected to the CVR.
Wait again for two minutes. Then, push the CVR TEST pushbutton switch for a maximum of six seconds.	There is no tone in the headset. NOTE: The test of relay 45TU is satisfactory with the related logic of relay 12KS2.

Subtask 23-71-00-710-064-A ** ON A/C NOT FOR ALL

D. Operational Test of Recorder-Power ENG1 Delay-Relay 46TU and Recorder-Power ENG2 Delay-Relay 45TU

NOTE: During the test, it is possible that you 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 for four minutes. Then, push the CVR TEST pushbutton switch until you hear a tone or for a maximum of six seconds.	You can hear a tone in the headset connected to the CVR.
Wait again for two minutes. Then, push the CVR TEST pushbutton switch for a maximum of six seconds.	There is no tone in the headset. NOTE: The test of relays 45TU and 46TU is satisfactory.

Subtask 23-71-00-865-083-A ** ON A/C NOT FOR ALL

E. 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 23-71-00-865-084-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)
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 23-71-00-860-090-A ** ON A/C NOT FOR ALL

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

[Rev.10 from 2021] 2026.03.31 23:16:05 UTC