External Power Contactor (EPC) Supply - Schematic Diagram
 Figure 005

R 1EFF : 001-049, 051-099, 101-149, 151-199, 1 24-41-00Page 29/30 1201-299, 301-399, 1Aug 01/05 1 1 1CES R External Power Contactor (EPC) Supply - Schematic Diagram R Figure 005A

 1EFF : 401-499, 1 24-41-00Page 31/32 1 1 Aug 01/05 1 1 1CES

R R  NOTE : Nevertheless, the ground power unit can supply ground/flight____ networks in ground service configuration (Ref. 24-42-00). 
R R R R  - when the pushbutton switch is pressed and released, the EPC closes and supplies the transfer circuit. Blue ON legend comes on to indicate the closure of EPC (AVAIL legend goes off). 
R  **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399,
 The effective supply of the aircraft network by means of the BTCs depends on the availability of the onboard main generation sources. In the case of APU generator already supplying the transfer circuit, the supply command by means of the external power receptacle causes the opening of the APU generator line contactor. For reference only, each channel is supplied according to the following priority order: - its generator, - the ground power unit, - the APU generator, - the second generator.
 NOTE : The EXT PWR pushbutton switch is springloaded. At each impulse____ on the EXT PWR pushbutton switch, the EGIU controls the change of position of the external power auxiliary relay, (Ref. 24-22-00). 
R  **ON A/C 401-499, 
R R R R R R R R R R R  The effective supply of the aircraft network by means of the BTCs depends on the availability of the onboard main generation sources. In the case of APU generator already supplying the transfer circuit, the supply command by means of the external power receptacle causes the opening of the APU generator line contactor. For reference only, each channel is supplied according to the following priority order: - its generator, - the ground power unit, - the APU generator, - the second generator. 
R R R R  NOTE : The EXT PWR pushbutton switch is springloaded. At each impulse____ on the EXT PWR pushbutton switch, the GAPCU controls the change of position of the external power auxiliary relay, (Ref. 24-22-00).

 **ON A/C 001-049, 051-099, 101-105, 151-199, 201-228, 301-302,
 (2) Indicating in the external power receptacle housing Two lights located in the external power receptacle housing enable easier utilization or removal of the ground power unit by the ground personnel. - Amber EXT PWR/AVAIL caution light controlled by the GPCU, comes on to indicate that the ground power unit is operating and the voltage correct. - White EXT/PWR NOT IN USE indicator light comes on to indicate that the ground power unit does not supply the aircraft and can be disconnected.
 NOTE : A lamp test of these two lights can be performed by means of____ the LIGHT TEST pushbutton switch located in the external power receptacle housing.
 **ON A/C 106-149, 229-299, 303-399,
 (2) Indicating in the external power receptacle housing Two lights located in the external power receptacle housing enable easier utilization or removal of the ground power unit by the ground personnel. - blue EXT PWR/AVAIL indicator light controlled by the GPCU, comes on to indicate that the ground power unit is operating and the voltage correct. - White EXT/PWR NOT IN USE indicator light comes on to indicate that the ground power unit does not supply the aircraft and can be disconnected.
 NOTE : A lamp test of these two lights can be performed by means of____ the LIGHT TEST pushbutton switch located in the external power receptacle housing. 
R  **ON A/C 401-499, 
R R R R R R R  (2) Indicating in the external power receptacle housing Two lights located in the external power receptacle housing enable easier utilization or removal of the ground power unit by the ground personnel. - blue EXT PWR/AVAIL indicator light controlled by the GAPCU, comes on to indicate that the ground power unit is operating and the voltage correct.

R R R  - White EXT/PWR NOT IN USE indicator light comes on to indicate that the ground power unit does not supply the aircraft and can be disconnected. 
R R R  NOTE : A lamp test of these two lights can be performed by means of____ the LIGHT TEST pushbutton switch located in the external power receptacle housing.
 **ON A/C ALL
 B. Communications 
R  **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399,
 (Ref. Fig. 006) 
R  **ON A/C 401-499, 
R  (Ref. Fig. 006A) 
R  **ON A/C ALL
 A general schematic is shown in this figure and describes all the communications between the different systems. They are of 2 types: - communications toward the SDAC, - BITE communications.
　
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