-the other position controls the ground service network supply from the ground power unit, if available. This position is electromagnetically latched.
 The switch returns to the normal position in case of voluntary or automatic
 (GPCU protections) unlatching of the ground power unit.
 The normal supply configuration takes precedence over the ground service
 configuration.

 NOTE : Overheat of TR2 results in the automatic unlatching of MAINT BUS
____ switch. This entails the cut-off of the ground distribution network.
 **ON A/C 106-149, 159-199, 210-299, 301-399,
 Supply selection for ground service network is controlled from panel 2000VU,
 MAINT BUS switch:
 - one position corresponds to the normal supply configuration.

 -the other position controls the ground service network supply from the ground power unit, if available and if the "COMMERCIAL" pushbutton switch (commercial load shed) is pressed. This position is electromagnetically latched.
 The switch returns to the normal position in case of voluntary or automatic
 (GPCU protections) unlatching of the ground power unit.
 The normal supply configuration takes precedence over the ground service
 configuration.

 NOTE : Overheat of TR2 results in the automatic unlatching of MAINT BUS
____ switch. This entails the cut-off of the ground distribution network.

 AC Ground Service Bus Control - Schematic Diagram
 Figure 003B

R AC Ground Service Bus Control - Schematic Diagram R Figure 003C
 1EFF : 401-499, 1 24-42-00Page 16 1 1 Aug 01/05 1 1 1CES 1

R  **ON A/C 401-499, 
R  Supply selection for ground service network is controlled from panel 2000VU, 
R  MAINT BUS switch: 
R  - one position corresponds to the normal supply configuration. 
R  - the other position controls the ground service network supply from the 
R  ground power unit, if available and if the "COMMERCIAL" pushbutton switch 
R  (commercial load shed) is pressed. This position is electromagnetically 
R  latched. 
R  The switch returns to the normal position in case of voluntary or automatic 
R  (GAPCU protections) unlatching of the ground power unit. 
R  The normal supply configuration takes precedence over the ground service 
R  configuration. 
R  NOTE : Overheat of TR2 results in the automatic unlatching of MAINT BUS____ 
R  switch. This entails the cut-off of the ground distribution network.

 AC GROUND SERVICE BUS CONTROL - MAINTENANCE PRACTICES
_____________________________________________________
 TASK 24-42-00-861-001
 Energize the Ground Service Network from the External Power
 1.
 Reason for the Job

__________________
 Self Explanatory

 2.
 Job Set-up Information

______________________
 A. Fixtures, Tools, Test and Support Equipment
 -------------------------------------------------------------------------------
REFERENCE QTY DESIGNATION
 -------------------------------------------------------------------------------
98A24403000000 1 CABLE HOLDING STRAP
 B. Referenced Information
 -------------------------------------------------------------------------------
REFERENCE DESIGNATION
 -------------------------------------------------------------------------------
24-41-00-861-002 Energize the Aircraft Electrical Circuits from the
 External Power R 24-41-51-000-001 Removal of the External Power Receptacle (20XG) R 24-41-51-400-001 Installation of the External Power Receptacle (20XG)
 3. Job Set-up
__________
 Subtask 24-42-00-010-050

 A. Get Access
 (1) Open the door 121AL to have access to the external power receptacle and panel 108VU.

 Subtask 24-42-00-480-050
 B. Aircraft Maintenance Configuration
 (1) Make sure that the CABLE HOLDING STRAP (98A24403000000) with the snap hook is in position on the feeder of the ground power unit.
 (2) Attach the feeder to the support with the snap hook.
 Subtask 24-42-00-420-050
 C. Connect the connector
 CAUTION : MAKE SURE THAT THE CABLE STRAP SUPPORTS ALL THE WEIGHT OF THE_______ CABLE WHEN THE CONNECTOR IS CONNECTED. THIS PREVENTS DAMAGE TO THE EXTERNAL POWER RECEPTACLE. 
R R R R R  NOTE : Examine the external power supply-cable and the external power____ receptacle before you do the connection. If you find corrosion or damage, or if the pins are not aligned correctly, replace the external power receptacle (Ref. TASK 24-41-51-000-001) and (Ref. TASK 24-41-51-400-001).
　
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