_______
 ELECTRICAL CIRCUITS.
 THERE IS A RISK OF ELECTROCUTION IF THE AC OR DC POWER STAYS
 CONNECTED.

 1.
 Reason for the Job

__________________
 Self Explanatory

 2.
 Job Set-up Information

______________________
 A. Fixtures, Tools, Test and Support Equipment
 -------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific blanking caps
 No specific cable ties
 No specific warning notice(s)
 No specific access platform 0.5 m (1 ft. 8 in.)

 B. Referenced Information -------------------------------------------------------------------------------
REFERENCE DESIGNATION -------------------------------------------------------------------------------25-11-41-000-001 Removal of the Third Occupant Seat
R  **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399,
 24-23-17-991-003 Fig. 401 R **ON A/C 401-499,
R  24-23-17-991-003-A Fig. 401A **ON A/C 001-049, 051-062, 101-105, 151-152, 201-205,
 24-23-17-991-004 Fig. 402 -------------------------------------------------------------------------------

REFERENCE DESIGNATION
 -------------------------------------------------------------------------------

R **ON A/C 063-099, 106-149, 153-199, 206-299, 301-399, 401-499,
 24-23-17-991-004-A Fig. 402A
 **ON A/C ALL
 3. Job Set-up
__________
 Subtask 24-23-17-010-050
 A. Get Access
 (1)
 Remove the Third Occupant seat (Ref. TASK 25-11-41-000-001).

 (2)
 On the rear panel 120VU, open the panel which gives access to the AC power center 123VU.

 (3)
 Put the access platform in position at the access door 121AL.

 (4)
 Open the access door 121AL.

 Subtask 24-23-17-941-050
 B. Safety Precautions
 (1)
 Make sure that the external power connector is not connected to the aircraft EXT PWR receptacle.

 (2)
 Put warning notice(s) in position on the access door 121AL to tell persons not to connect the external power connector to the aircraft EXT PWR receptacle.

 (3)
 In the cockpit, on the ELEC panel 35VU, make sure that these pusbutton switches are released:

 -BAT 1, BAT 2,
 -APU GEN,
 -GEN 1, GEN 2,
 -EXT PWR.

 (4)
 In the cockpit, put warning notice(s) in position to tell persons not to operate the pushbutton switches on these overhead panels:

 -21VU (EMER ELEC PWR section),
 -25VU (APU section),
 -35VU (ELEC).

 4. Procedure
_________ R **ON A/C 001-049, 051-062, 101-105, 151-152, 201-205,
 Subtask 24-23-17-020-051
 A. Removal of the AC Current Transformer (Ref. Fig. 401/TASK 24-23-17-991-003, 402/TASK 24-23-17-991-004)
 (1)
 Remove the screws (12) and the washers (11) from the studs of the contactor (5).

 (2)
 Disconnect the cables (10) from the studs of the contactor (5). NOTE : You must identify (also with the indications on the current

____ transformer) and disconnect only the cables which go through the current transformer.

 (3)
 Remove the nuts (9) and the washers (8) from the studs of the contactor (5).

 (4)
 Disconnect the cables (6) and (7) from the studs of the contactor (5).

 (5)
 Disconnect the electrical connector (4) from the current transformer (1).

 (6)
 Put blanking caps on the disconnected electrical connector (4) and electrical receptacle.

 (7)
 Remove the screws (3) and the washers (2) from the current transformer (1).

 (8)
 Remove the necessary cable ties to move the current transformer (1) along the cables.

 (9)
 Remove the current transformer (1).

 AC Current Transformer - Block Diagram
 Figure 401/TASK 24-23-17-991-003

R 1EFF : 001-049, 051-099, 101-149, 151-199, 1 24-23-17Page 404 1201-299, 301-399, 1Aug 01/05 1 1 1CES 1

R  AC Current Transformer - Block Diagram 
R  Figure 401A/TASK 24-23-17-991-003-A 
R 1EFF :  401-499,  1  24-23-17 Page 405 
1  1  Aug 01/05
 1  1
 1CES  1
　
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