Electrical Flashcards
The AC ESS BUS normally feeds from? Can it feed from another source?
AC BUS 1 Yes, AC BUS 2
When GALY & CAB is in the normal position,what are powered?
Main and secondary galleys powered.
When the EXT PWR light is ON it means?
Ground Power is connected to the plane’s systems
The BUS PRIORITY is?
ENG GEN, EXT PWR, APU GEN, OFFSIDE
In flight with one generator only, the main galley will be automatically?
Shed!
A BATT 1(2) FAULT light means?
Charging current outside limits.
Contactor opens
The AC ESS FEED ALTN will light when?
AC ESS BUS is then powered by?
Only when pushed.
AC BUS 2
The BUS TIE’s in AUTO mean?
Bus tie contactors open and close to supply AC buses.
When APU GEN selected OFF what happens?
Line contactor opens, fault reset
When AFT AVIONICS selected OFF what happens?
Removes power from Aft Avionics Rack, Live TV, WADL, XM Radio
A GEN 1(2) FAULT will light when?
Is this normal before engine start?
- Gen control unit or GCU has tripped
- Line contactor opens
Yes
The AC ESS FEED FAULT light means?
The AC ESS BUS is not powered
A GALY & CAB FAULT light means?
A load on any GEN is more than 100%
COMMERCIAL selected OFF
Commercial loads are turned off Cargo, cabin, galley, water, toilet, drain mast heat
GEN 1(2) selected OFF Will this reset the fault circuit?
Line contactor opens Yes