Systems ELECTRICAL Flashcards
When external power is suitable in terms of frequency, voltage and phase, which advisory message displays on the EICAS
Ext Pwr Avail
FCOM 1 07-02-3
Does the aircraft electrical system permit both EXT AC and APU power at the same time
Yes. If an engine VFG or APU Gen is avail when EXT PWR is selected A/C elec load is shared
FCOM 1 07-06-9
Which busses are always powered
BATT DIR and DC EMER
FCOM 1 07-03-2
When AC power is only supplied by the RAT, what message will be displayed on the EICAS
EMER PWR ONLY red
& RAT GEN ON cyan
FCOM 1 07-06-5
What is the max AC gen load
75 kVA continuous
up to 112.5 kVA for 5 mins
150 kVA for 5 secs
FCOM 1 07-02-1
AFM limitations 02-08-1
What occurs when CABIN PWR switch is used
Deactivates electrical loads from flight compartment outlets and selected cabin systems to isolate sources of smoke such as galleys and IFE
FCOM 1 07-06-4
What is the purpose of the permanent magnet alternator generators PMAGs
One on each engine accessory gearbox supply dedicated AC power to two Fly By Wire Power Converters FBWPC’s and the Electronic Engine Control EEC of each FADEC
FCOM 1 07-03-3
On the ground if batteries only supply the aircrafts power for more than 5 mins
BATT DISCHARGING caution on EICAS
Horn sounds until AC power is available or batteries are switched off
FCOM 1 07-03-2
What does the APU GEN light FAIL indicate
APU Generator Control Unit AGCU has removed the generator from the bus due to a fault
FCOM 1 07-06-10
What are the max loads for TRU 1,2 and 3
1 & 2 350 AMP 3 225 Amp
AFM Limitations 02-08-1
Although they are all rated at 350 AMP
FCOM 1 07-03-1
The RAT generator is _____ and supplies power to the ____ at speeds above ____
115 VAC 10kVA
AC ESS BUS and DC ESS BUS through TRU 3 at speeds above 148 kts
FCOM 1 07-02-7
APU Gen is rated to ____ kVA up to FL ____ and ____kVA at FL ___
75kVA FL 365
58kVA at FL 410
FCOM 1 07-02-2
How many Electrical Power Centres EPC’s
3
FCOM 1 07-04-5
The EPC’s are managed by the ____ and the ____
two Bus Power Control Units BPCU and the Emergency Power Control EMPC
FCOM 1 07-04-6
The BUS ISOL switch controls automatic
Electrical Power Centre EPC reconfiguration of line and bus tie contactors
FCOM 1 07-06-2
BATT 1/2 OVERTEMP indicates that
Temperature greater than or equal to 71 deg and remains until 65 deg
FCOM 1 07-06-33
The 3 Electrical Power Centres contain
The AC & DC busses, the TRU’s, line & bus contactors and most of the thermal circuit breakers
FCOM 1 07-04-5
Electrical Power Centre EPC 1 contains distribution infrastructure for ___
and is controlled by ___
Left Power Channel & Ext power
Bus Power Control Unit BPCU 1
FCOM 1 07-04-7
Electrical Power Centre EPC 2 contains distribution infrastructure for ___
and is controlled by ___
Right Power Channel & APU generator
Bus Power Control Unit BPCU 2
FCOM 1 07-04-7
Electrical Power Centre EPC 3 contains primary power distribution infrastructure for___
and is controlled by ___
Essential/Emergency power channel
Emergency Power Control EMPC
FCOM 1 07-04-5
If a Bus Power Control Unit fails
The remaining one takes control of the entire electrical system
FCOM 1 07-04-8
How many Control & Distribution Cabinets CDC’s receive AC & DC power from the EPC’s
5
FCOM 1 07-05-1
CDC 1 & 2 installed in the mid equipment bay are
Master CDC’s
CDC’s 3,4 & 5 are Slaves
FCOM 1 07-05-1
Primary functions of the CDC’s are
Distribute power through Solid State Power Controllers SSPC
Manage electrical load shedding (master CDC’s)
Monitor & report status of all CB’s to the CB Synoptic page
FCOM 1 07-05-2
