B. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
24-41-00-861-002  Energize the Aircraft Electrical Circuits from the External Power 24-41-00-862-002 De-energize the Aircraft Electrical Circuits Supplied from the External Power
 3. Job Set-up
__________
 Subtask 23-71-00-860-053

 A. Aircraft Maintenance Configuration
 (1)
 Energize the aircraft electrical circuits
 (Ref. TASK 24-41-00-861-002).

 (2)
 Make sure that the parking brake is locked.

 (3)
 Make sure that the aircraft is in the ground configuration.

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 (4) Make sure that the engines are stopped.
 (5) On the maintenance panel50VU, connect a 600 ohms headset to the CVR/HEAD SET connector.
 Subtask 23-71-00-865-053
 B. Make sure that this(these) circuit breaker(s) is(are) closed:
 -------------------------------------------------------------------------------
PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------
R R R R R  49VU ENGINE/2/FADEC A/AND EIU 2 49VU ENGINE/1/FADEC A/AND EIU 1 49VU ENGINE/1 AND 2/IGN/SYS A 49VU COM/CVR/SPLY 49VU COM/CVR/CTL 121VU ENGINE/IGN/ENG2/SYS B 121VU ENGINE/IGN/ENG1/SYS B 121VU ENGINE/IGN/ENG2/SYS A BAT 121VU ENGINE/IGN/ENG1/SYS A BAT 121VU ENGINE/ENG2/FADEC B 121VU ENGINE/ENG1/FADEC B/AND EIU 1  2KS2 2KS1 1JH 2RK 4RK 3JH2 3JH1 2JH2 2JH1 4KS2 4KS1  A05A04 A03E14E13 P42 P41 P40 P39Q40R41
 4. Procedure_________
 Subtask 23-71-00-710-052
 A. Test of the FLT/GND power supply of the CVR
 -------------------------------------------------------------------------------
ACTION RESULT -------------------------------------------------------------------------------
1. Make sure that you cannot hear the audio input in the headset. On the panel 21VU:
 2. On the overhead control and indicating panel 21VU:
 - Push the RCDR/GND CTL pushbutton switch.  - On the pushbutton switch, the ONlegend comes on. Make sure that you can hear the conversations from the CVR microphone in the headset.
 - Push the RCDR/GND CTL  On the panel 21VU:

 -------------------------------------------------------------------------------
ACTION RESULT -------------------------------------------------------------------------------
pushbutton switch. - On the pushbutton switch, the ON legend goes off. In the headset, make sure that you cannot hear the audio input.
 Subtask 23-71-00-710-053
 B. Test of the Power Supply of the CVR through the engines

R WARNING : MAKE SURE THAT YOU OPEN THE CIRCUIT BREAKERS AS FOLLOWS:
_______ R - 1JH, 2JH1 AND 3JH1 BEFORE 2KS1 R - 1JH, 2JH2 AND 3JH2 BEFORE 2KS2. R IF YOU DO NOT OBEY THIS SEQUENCE, THERE IS A RISK OF R ELECTROCUTION. THIS IS BECAUSE YOU WILL START CONTINUOUS R IGNITION IF YOU OPEN CIRCUIT BREAKER 2KS1 OR 2KS2 FIRST.
 -------------------------------------------------------------------------------ACTION RESULT -------------------------------------------------------------------------------
1. Make sure that you cannot hear the audio input in the headset.
 2.
 On the panel 121VU: R - Open the circuit breakers 2JH1, R 3JH1, 2JH2 and 3JH2.

 3.
 On the panel 49VU: R - Open the circuit breaker 1JH R then circuit breakers 2KS1 and R 2KS2.

 4. On the panel 121VU:
R - Open the circuit breakers 4KS1 R and 4KS2. R
5. On the panels 49VU and 121VU:
 -Close the circuit breakers
 2KS1, 2KS2, 4KS1 and 4KS2, and R then close the circuit breakers R 1JH, 2JH1, 3JH1, 2JH2 and 3JH2.
In the headset, make sure that you can hear the conversations from the CVR microphone.
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 -------------------------------------------------------------------------------
ACTION RESULT -------------------------------------------------------------------------------
-Start the chronometer.  Make sure that you can hear the conversations from the CVR microphone in the headset for 5 minutes. Then the audio input stops.
 Subtask 23-71-00-710-054
 C. Test of the CVR PWR CUT OFF RELAY (10RK).
 -------------------------------------------------------------------------------ACTION RESULT -------------------------------------------------------------------------------
　
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