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AIRCRAFT SYSTEMS
ELECTRICAL
CONTROLS AND INDICATORS
A318/A319/A320/A321 FLEET DSC-24-20 P 19/44
FCOM 19 AUG 10
(6) BUS TIE pushbutton
AUTO : The bus tie contactors (BTCs) automatically open or close to maintain power
supply to both AC BUS 1 and 2.
‐ One contactor is closed, when :
• One engine generator supplies the associated AC BUS, and
• The APU generator, or external power supplies the other side.
‐ Both contactors are closed during single-engine operation, or operation on the
APU generator, or external power supply.
OFF : Both bus tie contactors open.
(7) AC ESS FEED pushbutton

　
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