Electrical System Flashcards
1
Q
Name some important items on the main hot battery bus
A
- spar valves
- APU and lower cargo fire extinguishers
- engine fire extinguishers
- fire unlock switches
2
Q
(Dark Airplane) When I place the battery switch to on, what busses are powered?
A
- 2 hot battery busses
- 2 battery busses
3
Q
When I place the STBY PWR selector to AUTO, what busses are powered and how?
A
APU and Main STBY busses through inverters from the APU and Main Battery Busses
4
Q
What Items are on the APU STBY bus?
A
- Left FMC
- Left ND
- Left PFD
5
Q
What items are on the MAIN STBY bus?
A
- Primary EICAS
- Left EIU, CDU, ILS, VOR, VHF
- some additional aircraft instruments
6
Q
What don’t we have when we lose all generators?
A
- No LE
- No Anti-Skid
- No Reversers
- No Auto-Speedbrakes
7
Q
During electrical emergency, when does the central IRS go offline?
A
5 minutes
8
Q
What will cause an IDG to disconnect?
A
- high oil temperature
- low oil pressure
- uncorrectable frequency fault
9
Q
Which bus charges the battery bus?
A
ground service bus
10
Q
What is the primary power source for the ground service bus?
A
AC bus 1
