Electrical Flashcards
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IDG FAULT light
Hot temp
Lo oil pressure
What does ALT ESS XFER Light on mean
Not receiving power from AC Bus (it’s normal source)
When Bus 2 is supplying power to the essential bus
Priority of power AC BUS 1
What is the bus priority system
Onside Gen, APU, Offside, Ground power
Utility bus gets its power from
It’s respective
AC BUS
What are the 6 AC buses
AC BUS 1 AC BUS 2 AC ESS AC SERV AC UTIL BUS 1 AC UTIL BUS 2
What buses powered when AC external power is connected
Utility and Service Buses
What does AC bus 1 power
AC ESS BUSS
AC UTIL BUS1
If AC BUS 1 gone then ESS transfers to AC BUS 2
What other uses does AC BUS 2 supply power to
AC SERV BUS
AC UTIL BUS 2
Total power AC power loss
ESS BUS is powered from the ADG BUS and the ADG.
The ESS BUSS powers the ESS TRU which powers the DC ESS BUSS and the BATT BUSS
What does the AC service bus power
• Powers the service outlets that are used for cleaning
• Powers the service TRU with powers the DC SERVICE
BUS
Where do the AC UTIL BUS 1 and 2 receive their power and what do they power
- Powered by their respective AC BUS and 2
* UTIL BUS 1 and 2 provide power to the battery chargers and galley
When are utility buses shed
During flight when only one gen in use
• On the ground when one gen operating and flaps down, and main and service door closed
Service configuration
- UTIL BUSS 1 and 2 powered
* Battery chargers
When does ADG deploy
• Loss of all Generators and
AC BUS 1 or 2 not powered
Sources of DC power
5 TRUs
2 NiCad batteries (24 volt 17amp Main) (24 volt 43 amp APU)
DC external power
What are the 5 TRUs
- TRU 1
- TRU 2
- ESS TRU 1
- ESS TRU 2
- SERV TRU
What is the purpose of the TIE 1 and TIE 2 switch lights
To select the associated DC ties to closed. White switch and EICAS indicates closing of the tie
ESS tie switch light
Connects the SERV TRU to the ESS BUS
Batteries
What charges them
APU-24 volt 43 Ampere
Main Battery-24 volt 17 Ampere
UTIL BUS 1 and 2
What does the DC service bus power?
Nav, Lav, Dome, service
Powered from APU Battery
What’s on the emergency Bus?
Squibs
Fuel SOV
Hyd SOV
What powers emergency bus
APU battery bus and Left battery bus
Voltage, hertz, kVA of ADG
115 volts, 400htz, 15 kVA
IDG , APU Gen
115 volt, 400 Hz, 30 kVA
