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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