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 DC GROUND SERVICE BUS CONTROL - DESCRIPTION AND OPERATION_________________________________________________________
 1. General_______ 
R  **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399,
 (Ref. Fig. 001) 
R  **ON A/C 401-499, 
R  (Ref. Fig. 001A) 
R  **ON A/C ALL
 DC ground flight distribution network can be supplied: - either normally from the aircraft network, - or directly by the ground power unit upstream of the external power contactor. This is via the TR2 in ground service configuration, without energizing the whole aircraft network.
 2. Component Location__________________
 **ON A/C 001-049, 051-062, 101-105, 151-152, 201-205,
 (Ref. Fig. 002) 
R  **ON A/C 063-099, 106-149, 153-199, 206-299, 301-399, 401-499,
 (Ref. Fig. 002A)
 **ON A/C ALL
 -------------------------------------------------------------------------------FIN | FUNCTIONAL DESIGNATION | PANEL|ZONE|ACCESS | ATA | | | | DOOR | REF. -------------------------------------------------------------------------------3PX CNTOR-DC SVCE BUS GND SPLY 120VU 212 831 24-43-55

 

 3. System Description__________________ 
R  **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399,
 (Ref. Fig. 001) 
R  **ON A/C 401-499, 
R  (Ref. Fig. 001A) 
R  **ON A/C ALL
 The DC ground/flight network comprises the following 28 VDC service busses: - 601PP, - 602PP. These sub-busbars are supplied directly from the ground power unit through the contactor 14XX via the TR2. The contactor 14XX is controlled by the MAINT BUS control switch 5XX located on panel 2000VU.
 4. Operation/Control and Indicating________________________________ The operation is described in ATA Ref. 24-42-00.
 NOTE : In case of TR2 overheat, the supply of the ground service network is____ cut off. 

R 1EFF : ALL 1 24-43-00Page 2 1 1 Aug 01/05 1 1 1CES 1

 Ground Service Network-General
 Figure 001

R 1EFF : 001-049, 051-099, 101-149, 151-199, 1 24-43-00Page 3/4 1201-299, 301-399, 1Aug 01/05 1 1 1CES R Ground Service Network-General R Figure 001A

R 1EFF : 401-499, 1 24-43-00Page 5/6 1 1 Aug 01/05 1 1 1CES

 DC Ground Service Bus Control-Component Location
 Figure 002

 

 DC Ground Service Bus Control - Component Location
 Figure 002A

 

 CONTACTOR (3PX) - REMOVAL/INSTALLATION
______________________________________
 TASK 24-43-55-000-001
 Removal of the DC Service Bus Ground Supply Contactor (3PX)
 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 circuit breaker(s) safety clip(s)
 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 **ON A/C 001-049, 051-062, 101-105, 151-152, 201-205,
 24-43-55-991-001 Fig. 401 R **ON A/C 063-099, 106-149, 153-199, 206-299, 301-399, 401-499,
 24-43-55-991-001-A Fig. 401A

 **ON A/C ALL
 3. Job Set-up__________
 Subtask 24-43-55-010-050
 A. Get Access 
R  (1) Remove the Third Occupant seat (Ref. TASK 25-11-41-000-001). 
R R  (2) In the cockpit, remove the front panel on the bottom right side of the panel 120VU. 
R  (3) Put the access platform in position at the access door 121AL.
 (4) Open the access door 121AL.
 Subtask 24-43-55-860-050
 B. Safety Precautions
R  (1) Make sure that the external power connector is not connected to the aircraft EXT PWR receptacle. 
R R R  (2) Put warning notice(s) in position on the access door 121AL to tell persons not to connect the external power connector to the EXT PWR receptacle. 
　
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