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 B.  Center Bus Transfer Relay
_________________________
 (1)  The center bus transfer relay selects the input power source for the AC center bus. When de-energized, the relay selects left main AC and DC bus power. When energized the relay selects standby power sources. The relay is in main power distribution panel P6.
 C.  Ground Service Transfer Relay
_____________________________
 (1)  The ground service transfer relay selects the power source for the ground service bus. When de-energized, the ground service bus is powered from the right main AC bus. Energized, the relay selects external power or APU generator power. The relay is located in P37 panel or P34 panel.
 D.  Ground Handling Relay
_____________________
 (1)  The ground handling relay selects either external power or APU generator power for the ground handling bus. The relay is a dual position type, with a center off position. The relay is in APU/external power panel P34.
 E.  Ground Service Select Relay
___________________________
 (1)  The ground service select relay selects APU or external power for the ground service transfer relay. The relay selects APU power when energized. When APU and external power are available, external power has priority. The relay is located in P34 panel.
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MAINTENANCE MANUAL

P37 PANEL
SEE B

K119 - LEFT UTILITY BUS RELAY 2
P34 PANEL SEE C
P70 PANEL
SEE A

A
INBD FWD
P70 - MISCELLANEOUS ELECTRICAL EQUIPMENT PANEL A
A
K103 -K101 -
GROUND SERVICE GROUND
SELECT RELAY HANDLING
FWD OUTBD RELAY
P37 - RIGHT MISC
ELECTRICAL EQUIP PANEL
B

K102 - GROUND SERVICE TRANSFER RELAY 1
K120 - RIGHT UTILITY FWD
BUS RELAY
INBD
A-A  P34 - APU/EXTERNAL 
POWER PANEL 
1  AIRPLANE WITH K102 IN THE P37 PANEL 
2  AIRPLANE WITH K119 IN THE P70 PANEL  C 

115 - Volt AC Power Distribution Component Location
Figure 1 (Sheet 1)

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MAINTENANCE MANUAL

P31 PANEL SEE A
P37 PANEL SEE B
P34 PANEL
SEE C

A
A
FWD OUTBD
P37 - RIGHT MISC ELECTRICAL EQUIP PANEL
B
K120
RIGHT
UTILITY
BUS RELAY

A-A
1 AIRPLANE WITH K102 IN THE P34 PANEL
2 AIRPLANE WITH K119 IN THE P31 PANEL
K119 LEFT UTILITY BUS RELAY
2
K103 GROUND SERVICE SELECT RELAY
K102 GROUND SERVICE TRANSFER RELAY
1
K101 GROUND HANDLING RELAY
GENERATOR POWER PANEL, P31
A

P34 - APU/EXTERNAL
POWER PANEL

C
115 - Volt AC Power Distribution Component Location
Figure 1 (Sheet 2)

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H74269
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115 - Volt AC Power Distribution Component Location
Figure 1 (Sheet 3)

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 F. Instrument Bus Voltage Sensing Unit
___________________________________
　
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