-
Set the TUNING potentiometer to zero.

 -
Set the GAIN potentiometer to OFF.

 (2)
 Disconnect the electrical lead that connects the water switch to the body of the battery (short circuit).

 (3)
 Make sure that there is no grease on the support of the ULB and the water switch. If you find grease, clean it off with CLEANING AGENTS (Material No. 11-005).

 (4)
 Close the access door 312AR.

 (5)
 Remove the access platform(s).

 1EFF : ALL 1 23-71-00Page 513 1 1 May 01/04 1 1 1CES 1 TASK 23-71-00-720-002

 Functional Test of the bulk-erase function and bulk-erase inhibition-logic of the CVR WARNING : MAKE SURE THAT ALL THE CIRCUITS IN MAINTENANCE ARE ISOLATED BEFORE
_______ YOU SUPPLY ELECTRICAL POWER TO THE AIRCRAFT.
 NOTE : This procedure is applicable to the CVR and the SSCVR.
____
 1. Reason for the Job
__________________
 To make sure that the CVR will erase only when the aircraft is on the ground with the parking brake set.
 2. Job Set-up Information
______________________
 A. Fixtures, Tools, Test and Support Equipment
 -------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific  600 ohms headset
 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 32-69-00-860-001 Simulation of Flight, with the Aircraft on the Ground
 1EFF : ALL 1 23-71-00Page 514 1 1 May 01/04R 1 1 1CES 1

 3. Job Set-up
__________ Subtask 23-71-00-860-057
 A. Aircraft Maintenance Configuration
 (1)
 Energize the aircraft electrical circuits
 (Ref. TASK 24-41-00-861-002).

 (2)
 Make sure that the engine shutdown occured not less than 5 minutes before you do the procedure.

 (3)
 On the maintenance panel 50VU, connect a 600 ohms headset to the CVR/HEAD SET connector.

 Subtask 23-71-00-865-052
 B. Make sure that this(these) circuit breaker(s) is(are) closed:
 -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------49VU COM/CVR/SPLY 2RK E14
 49VU COM/CVR/CTL 4RK E13 121VU HYDRAULIC/PARK BRK/CTL/STBY 71GG N37 121VU HYDRAULIC/PARK BRK/CTL/NORM 70GG N36
 4. Procedure
_________ Subtask 23-71-00-720-050
 A. Do the functional test with the parking brake locked and the aircraft in the ground configuration:
 (1) Aircraft Maintenance Configuration
 (a)
 On the panel 110VU, make sure that the Parking Brake Control Switch (73GG) is in the ON position.

 (b)
 Make sure that the aircraft is on the ground (landing gear compressed).

 1EFF : ALL 1 23-71-00Page 515 1 1 May 01/04R 1 1 1CES 1

 (2) Test:
 -------------------------------------------------------------------------------ACTION RESULT -------------------------------------------------------------------------------
1. On the overhead control and indicating panel 21VU: On the panel 21VU:
 - Push the RCDR/GND CTL pushbutton switch.  - On the pushbutton switch, the ONlegend comes on.
 In the headset:
 - Make sure that you can hear the conversations from the CVR
 microphone.
 - Push the RCDR/CVR ERASE pushbutton switch for not less than 2 seconds and release it.  In the headset:- Make sure that you can hear the 400Hztone signal.
 After approximately 3 seconds  Make sure that you can hear the conversations from the CVR microphone.
 Subtask 23-71-00-720-054

 B. Do the functional test with the parking brake unlocked:
 (1)
 Aircraft Maintenance Configuration

 (a)
 On the panel 110VU, put the Parking Brake Control Switch (73GG) in the OFF position.

 (b)
 Make sure that the aircraft is on the ground (landing gear compressed).

 (2)
 Test:

 -------------------------------------------------------------------------------ACTION RESULT -------------------------------------------------------------------------------
　
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