Bus Transfer Switch
The Bus Transfer switch is normally in the AUTO (guarded) position to
insure uninterrupted AC power to the Transfer Busses from any
operating generator or ground power through automatic operation of the
Bus Tie Breakers.
With the Bus Transfer switch in AUTO, the DC Cross Bus Tie relay
automatically opens at glide slope capture to isolate DC Bus 1 from DC
Bus 2 during a Flight Director or Autopilot ILS approach preventing a
single failure from affecting both navigation receivers and Flight Control
Computers (FCC) .
The Bus Transfer switch is normally in the AUTO (guarded) position to
insure uninterrupted AC power to the Transfer Busses from any
operating generator or ground power through automatic operation of the
Bus Tie Breakers.
With the Bus Transfer switch in AUTO, the DC Cross Bus Tie relay
automatically opens at glide slope capture to isolate DC Bus 1 from DC
Bus 2 during a Flight Director or Autopilot ILS approach preventing a
single failure from affecting both navigation receivers and Flight Control
Computers (FCC) .
In Flight - Bus Transfer switch AUTO
- The Transfer Busses are powered by their respective Integrated
Drive Generator.
- The BTBs will operate automatically to maintain power on the
Transfer Busses.
- The DC Cross Bus Tie Relay operates normally and will open at glide
slope capture during a Flight Director or Autopilot ILS approach.
Electrical System SGR
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