Electrical Power Flashcards
AC system is ___V at ___Hz
115V at 400Hz
The AC system is supplied power from what sources?
2 engine driven Integrated Drive Generators (IDGs)
1 APU Generator
1 RAT Generator
1 AC external power input
DC system is __V
24V
The DC system is supplied power from what sources?
2 Nickel cadmium batteries
1 DC external power input
3 Transformer Rectifier Units (TRUs) convert AC to DC
1 Inverter converts DC to AC
What converts variable engine speed into constant generator supply?
Constant Speed Drive (CSD). One per engine
Each IDG generates constant frequency __ power at __kVA, ___V, ___Hz, _-phase
AC power at 40kVA, 115V, 400Hz, 3-phase
(T/F) The IDG oil system is liquid-cooled
False. Air cooled
If the amber light next to the IDG switch illuminates what does this mean?
The IDG OIL message is on EICAS and a manual disconnection of the IDG is required
(T/F) The APU generator needs to be manually turned on when the APU is to be used for AC power.
False. Pushing the APU GEN button disconnects the APU GEN
BATT DISCHARGING means what on EICAS?
The batteries are discharging, the generators aren’t working and the RAT should be deployed once all other options are checked
The only inverter on the aircraft is located where?
The FWD E-bay
BATT __ provides power for APU start
BATT 2
BATT 1 is located ____
BATT 2 is located ____
BATT 1 is located in the FWD E-bay
BATT 2 is located in the AFT E-bay
(T/F) During an APU start the battery contactor for battery 2 will automatically open, stopping supply to the other systems.
True
There are __ Integrated control centers (ICCs) installed on the aircraft. The L & R are located ____. The Emergency ICC is located ___. The Auxiliary ICC is located ____.
There are 4 Integrated control centers (ICCs) installed on the aircraft. The L & R are located Middle E-bay. The Emergency ICC is located FWD E-bay. The Auxiliary ICC is located AFT E-bay.
If a thermal circuit breaker trips, what EICAS message will be displayed and what color will it be?
Where can I find information on which circuit breaker tripped?
Can I reset these CB in air?
REMOTE CB TRIP
Blue
MCDU CB page
No. CB reset can only be done on the ground by mx
The Left Integrated Control Center (LICC) provides power distribution and protection for:
AC BUS 1 / DC BUS 1
AC / DC ground service busses
Line replaceable modules (TRU1, GCU1, External power modules)
Several thermal CB’s
The Right Integrated Control Center (RICC) provides power distribution and protection for:
AC BUS 2
DC BUS 2
DC ESS BUS 2
Line replaceable modules (TRU2, GCU2, AGCU, External power modules)
The Emergency Integrated Control Center (EICC) provides power distribution and protection for:
AC ESS BUS DC ESS BUS 1 DC ESS BUS 3 AC STBY BUS HOT BATT BUS 1 Line replaceable modules (ESS TRU, several thermal CBs)
The Auxiliary Integrated Control Center (AICC) provides power distribution and protection for:
APU START BUS
HOT BATT BUS 2
Several thermal CBs
There are ___ SPDAs installed and they’re located ____ and ____.
2
FWD E-bay
Mid E-bay
(T/F) Remote CBs tripped in the SPDAs can be reset in the MCDU in the cockpit.
True
Electrical system fault logic provides power in the following order:
Onside IDG
APU
GPU
Opposite IDG
(T/F) One AC source can supply the entire electrical system
True
(T/F) The DC ground port can only be used for APU start
True
The AC GPU port is located ____. The DC GPU port is located ____.
AC is on the lower left hand side of the aircraft just below the cockpit
DC is located at the lower left side of the aircraft aft of the rear passenger door
GPU CONNECTED EICAS message means what?
You have either an AC or DC GPU connected and you released the parking brake
(T/F) A cabin depressurization will automatically disconnect the cockpit PC plugs and can be reset by pushing the PC button twice
True
