4. Procedure
_________ (Ref. Fig. 401/TASK 24-41-34-991-001) Subtask 24-41-34-420-050
 A. Installation of the GPCU
 (1)
 Remove the blanking caps from the electrical connectors.

 (2)
 Make sure that the electrical connectors are clean and in the correct condition.

 (3)
 Clean the component interface and/or the adjacent area.

 (4)
 Do an inspection of the component interface and/or the adjacent area.

 (5)
 Put the GPGU in position in its rack (6).

 (6)
 Slowly push the GPCU until it connects with the fixed connector (5).

 (7)
 Lift the 2 knurled nuts (1) over the 2 studs (2).

 (8) Tighten the 2 knurled nuts (1). Subtask 24-41-34-865-058
 B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s): 7XG, 11XG, 2XG
 Subtask 24-41-34-710-050
 C. Operational Test of the Ground Power Control Unit
 (1) Do an operational test of the GPCU with the CFDS (Ref. TASK 24-41-00-740-002).
 NOTE : As an alternative procedure for the operational test without
____ the CFDS, you can do this procedure (Ref. TASK 24-41-00-861-002). Make sure that the aircraft electrical circuits are correctly energized with the external power supply.
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 5. Close-up
________ Subtask 24-41-34-410-050
 A. Close Access
 (1)
 Make sure that the work area is clean and clear of tool(s) and other items.

 (2)
 Remove the warning notice(s).

 (3)
 Close the access door 811.

 (4)
 Close the access door 121AL.

 (5)
 Remove the access platform(s).

R 1EFF : 001-049, 051-099, 101-105, 151-199, 1 24-41-34Page 408 1201-228, 301-302, 1May 01/05 1 1 1CES 1

R  **ON A/C 401-499, 
R  TASK 24-41-34-000-001-A 
R  Removal of the Ground Auxiliary Power Control Unit (GAPCU) (24XG) 
R  CAUTION : MAKE SURE THAT NO AC OR DC POWER IS CONNECTED TO THE AIRCRAFT_______ 
R  ELECTRICAL CIRCUITS. 
R  THERE IS A RISK OF DAMAGE TO EQUIPMENT DURING ITS REMOVAL/ 
R  INSTALLATION IF THE AC OR DC POWER STAYS CONNECTED. 
R  1. Reason for the Job__________________ 
R  Self Explanatory 
R  2. Job Set-up Information______________________ 
R  A. Fixtures, Tools, Test and Support Equipment 
R  -------------------------------------------------------------------------------
R  REFERENCE  QTY DESIGNATION 
R  -------------------------------------------------------------------------------
R  No specific  blanking caps 
R  No specific  circuit breaker(s) safety clip(s) 
R  No specific  warning notice(s) 
R  No specific  access platform 0.5 m (1 ft. 8 in.) 
R  No specific  access platform 1.6 m (5 ft. 3 in.) 
R  B. Referenced Information 
R  -------------------------------------------------------------------------------
R  REFERENCE  DESIGNATION 
R  -------------------------------------------------------------------------------
R  24-41-34-991-003  Fig. 402 
R  3. Job Set-up__________ 
R  Subtask 24-41-34-010-051 
R  A. Get Access 
R  (1) Put an access platform in position at the access door 811. 
R  (2) Open the access door 811.

R  (3) Put an access platform in position at the access door 121AL. 
R  (4) Open the access door 121AL. 
R  Subtask 24-41-34-941-053 
R  B. Safety Precautions 
R  (1) Make sure that the external power connector is not connected to the 
R  aircraft external power receptacle. 
R  (2) Put warning notice(s) on the access door 121AL to tell persons not to 
R  use the external power receptacle. 
R  (3) In the cockpit, on the overhead ELEC panel 35VU, release these 
R  pushbutton switches: 
R  - BAT 1, BAT 2, 
R  - APU GEN, 
R  - GEN 1, GEN 2, 
R  - EXT PWR. 
R  (4) In the cockpit, put warning notice(s) to tell persons not to operate 
R  the pushbutton switches on these overhead panels: 
R  - 21VU (EMER ELEC PWR), 
R  - 35VU (ELEC). 
　
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