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

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

 -21VU (EMER ELEC PWR),
 -35VU (ELEC).

 (5)
 In the cockpit, on the APU section of the overhead panel 25VU, put warning notice(s) to tell persons not to start the APU.

 Subtask 24-51-51-865-050
 C. Open, safety and tag this(these) circuit breaker(s):
 -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------FOR 15XN1
 123VU BUS 1/131XP-A/SPLY 5XN1 AB12 FOR 15XN2
 123VU BUS 2/231XP-A/SPLY 5XN2 AB01

 4. Procedure
_________

 (Ref. Fig. 401/TASK 24-51-51-991-001) Subtask 24-51-51-020-050
 A. Removal of the Autotransformer
 (1)
 Disconnect the electrical connector (1).

 (2)
 Put blanking caps on the disconnected electrical connectors (1) and (5).

 (3)
 Loosen the 4 screws (4).

 (4)
 Hold the transformer (2).

 (5)
 Remove the screws (4) and the washers (3).

 (6)
 Remove the transformer (2).

 Autotransformers
 Figure 401/TASK 24-51-51-991-001
 1EFF :  ALL  1  24-51-51 Page 404 
1  1  Feb 01/98
 1  1
 1CES  1

 TASK 24-51-51-400-001
 Installation of the 115/26VAC Autotransformer (15XN1, 15XN2)
 WARNING : MAKE SURE THAT NO AC OR DC POWER IS CONNECTED TO THE AIRCRAFT
_______ 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 warning notice
 No specific access platform 0.5 m (1 ft. 8 in.)

 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 24-51-51-991-001 Fig. 401 FOR FIN 15XN1 31-60-00-860-001 EIS Start Procedure 31-60-00-860-002 EIS Stop Procedure

 3. Job Set-up
__________
 Subtask 24-51-51-860-051
 A. Aircraft Maintenance Configuration
 (1)
 Make sure that the access platform is in position at the access door 121AL.

 (2)
 Make sure that the access door 121AL is open.

 (3)
 Make sure that the external power connector is not connected to the aircraft receptacle.

 (4)
 Make sure that, on the access door 121AL, there is a warning notice to tell persons not to connect the external power connector.

 (5)
 In the cockpit, on the overhead ELEC panel 35VU, make sure that these pushbutton switches are released:

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

 (6)
 Make sure that there is a warning notice in the cockpit to tell persons not to operate the pushbutton switches on these overhead panels:

 -21VU (EMER ELEC PWR),
 -35VU (ELEC).

 (7)
 In the cockpit, on the APU section of the overhead panel 25VU, make sure that a warning notice is in position to tell persons not to start the APU.

 (8)
 In the cockpit, make sure that the panel (6) which gives access to the panel 122VU is removed.

 Subtask 24-51-51-865-051
 B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged
 -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------FOR 15XN1
 123VU BUS 1/131XP-A/SPLY 5XN1 AB12 FOR 15XN2
 123VU BUS 2/231XP-A/SPLY 5XN2 AB01
 4. Procedure
_________
　
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