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FOR SIMULATION USE ONLY ā NOT A TRAINING AID
Bus Tie Switch
Figure 1-16 Bus Tie Switch Location
The BUS TIE switch, located on the front cockpit right console, is used to tie/isolate
the battery and generator buses. With the BUS TIE switch engaged (NORM position),
the generator feeds both generator and battery bus items. If the bus tie fails, or is
set to OPEN, the amber BUS TIE caution on the EICAS illuminates, separating the
battery and generator buses.
If the battery or battery bus fails (red BAT BUS warning on the EICAS illuminated)
while the BUS TIE caution is illuminated, items on the battery bus will not be
powered.
If the generator fails while the BUS TIE caution is illuminated, items on the
generator bus will not be powered. Expect a minimum of 30 minutes of battery
power to the battery bus items.
If the generator has failed and the BUS TIE switch is in the NORM position, then the
battery powers all items except the air conditioner, but for a reduced amount of
time. If only the generator bus (red GEN BUS warning on EICAS illuminated) has
failed, the items on the generator bus will not be powered, but if the BUS TIE switch
is in the NORM position, the generator continues to power the battery bus and
charge the battery.
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