Section 3
Emergency Procedures
Columbia 400 (LC41-550FG)
RC050002
Initial Issue of Manual: November 10, 2004
3-30
Latest Revision Level/Date: -/11-10-2004
COMPLETE LEFT OR RIGHT BUS FAILURE
General
– Normally, a pilot can anticipate the onset of a complete electrical failure. Items like
an alternator failure and a battery discharging state usually precedes the total loss of electrical
power on the left or right bus. At the point the pilot first determines the electrical system is in an
uncorrectable state of decay, appropriate planning should be initiated. Turning on the crosstie
switch should restore the bus to normal operation. If turning on the crosstie switch negatively
affects the good bus, the crosstie switch should be turned off and only the remaining bus should
be used. The checklist should be reviewed for items that are on the failed bus and rendered
inoperative. The table shown in Figure 3 - 5 lists the equipment driven by each bus.
Crosstie Switch –
The crosstie switch is the white switch located between the left and right
master switches. This switch is to remain in the OFF position during normal operations. The
crosstie switch is only closed, or turned on, when the aircraft is connected to ground power or in
the event of an alternator failure. This switch will join the left and right buses together for
ground operations when connected to ground power. In the event of a left or right alternator
failure, this switch will join the two buses allowing the functioning alternator to carry the load on
both buses and charge both batteries.