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
The EXT PWR AVAIL (Green) light means? When does the AVAIL (Green) light go out?
Power is connected and good. If ON is lit or power disconnected
An APU GEN FAULT light means?
- A Gen control unit has tripped
- Line contactor has opened (except if GEN selected OFF)
The BATT 1(2) pb controls?
The Battery Charge limiter by connecting and disconnecting the BATT to DC BATT BUS
BATT 1(2) selected OFF means?
Is the DC BATT BUS powered with a BATT 1(2) OFF light?
Are the HOT BUSES powered with a BATT 1(2) OFF light?
Charge limiter is off.
Yes
Yes
An IDG FAULT light means?
Oil overheat or low oil pressure
A GEN 1 LINE SMOKE light indicates?
Smoke in the Avionics Ventilation Duct
When GEN 1 LINE is selected off what happens to the GEN 1?
How is AC BUS 1 Powered?
Are the Main fuel pumps still powered?
- GEN 1 line contactor opens
- AC BUS 1 is powered from GEN 2
- Yes, 1 in each main tank