-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.

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 C. Open, safety and tag this(these) circuit breaker(s):
 -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------
122VU ELEC/EXT PWR/CTL 11XG X29 122VU ELEC/GPCU 7XG Y24 123VU GND/PWR/PROT 2XG AB07
 4. Procedure
_________
 (Ref. Fig. 401/TASK 24-41-34-991-001) Subtask 24-41-34-020-050
 A. Removal of the GPCU
 (1)
 Loosen the two knurled nuts (1).

 (2)
 Lower the two knurled nuts (1) to release the two studs (2).

 (3)
 Carefully pull on the handle (3) of the GPCU (4) until the fixed connector (5) is disconnected.

 (4)
 Remove the GPCU from its rack (6).

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

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 Ground Power Control Unit (GPCU)
 Figure 401/TASK 24-41-34-991-001

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 TASK 24-41-34-400-001 Installation of the Ground Power Control Unit (GPCU) (1XG) CAUTION : MAKE SURE THAT NO AC OR DC POWER IS CONNECTED TO THE AIRCRAFT
_______ ELECTRICAL CIRCUITS. THERE IS A RISK OF DAMAGE TO EQUIPMENT DURING ITS REMOVAL/ INSTALLATION 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.)
 No specific access platform 1.6 m (5 ft. 3 in.)

 B. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
24-41-00-740-002  Operational Test of the Ground power Control Unit (GPCU) 24-41-00-861-002 Energize the Aircraft Electrical Circuits from the External Power 24-41-34-991-001 Fig. 401
 3. Job Set-up
__________ Subtask 24-41-34-860-050
 A. Aircraft Maintenance Configuration
 (1)
 Make sure that the access platform is in position at the access door

 811.

 (2)
 Make sure that the access door 811 is open.

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 (3)
 Make sure that the access platform is in position at the access door 121AL.

 (4)
 Make sure that the access door 121AL is open.

 (5)
 Make sure that the external power connector is not connected to the aircraft receptacle.

 (6)
 Make sure that a warning notice is in position on the access door 121AL to tell persons not to use the external power receptacle.

 (7)
 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.

 (8)
 In the cockpit, make sure that a warning notice is in position to tell persons not to operate the pushbutton switches on these overhead panels:

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

 (9)
 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.

 Subtask 24-41-34-865-057
 B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged
 -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------122VU ELEC/EXT PWR/CTL 11XG X29 122VU ELEC/GPCU 7XG Y24 123VU GND/PWR/PROT 2XG AB07
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