Electrical Flashcards
What is the purpose of the Cabin Utility switch
Powers cabin and utility systems
What does the AVAIL light mean on the external power switch
Power is connected and acceptable
What does the DRIVE light on the IDG switch mean
IDG oil pressure is low
When will the IDG Drive disconnect automatically
High oil temperature ONLY
When will the IDG Drive require manual disconnection
Low oil pressure
Main AC power sources
- Left and right IDG
- APU
- External power
If no other sources of power will the APU power both main transfer buses
Yes
With APU and Primary External power how are the buses powered
- APU powers Left Main AC bus
- Primary powers the right main AC bus
When will the APU automatically start
Both transfer buses are unpowered
Primary external power normally powers which bus
Right Main bus
Secondary external power normally powers which bus
Left main bus
What is the order of priority for powering the main transfer buses
- Respective IDG
- APU
- Opposite IDG
Main buses power individual components such as
- Cooling vent fans
- Recirc fans
- Lavatory/Galley fans
- Electric hydraulic pumps
- IFE
What does the ground service bus power
- Main battery charger
- APU battery charger
- Miscellaneous cabin systems
What is the Ground Handling bus used for
- Fueling operations
- Cargo operations
