Oral Bank - ELECTRICAL Flashcards
What are the main AC electrical power sources on the LCF?
- Four IDG’s
- Two external power sources
What is the main function of the Standby Power Switch in the Auto position?
Allows the main and APU standby busses to be powered from available sources
What does the “AVAIL” light indicate on the External and APU PWR switches?
The related power source is PLUGGED IN and available and the power quality is ACCEPTABLE
When is the main cargo deck handling bus powered?
When the “AVAIL” light is displayed on the APU 2 or EXT 2 switches
What electrical power source provides power for the lower lobe cargo handling, fuel panel, and AUX 4 hydraulic pump?
EXT PWR 1 or APU GEN 1 is AVAIL or selected ON (powering the Ground Handling bus)
What are some of the equipment items powered but he Utility busses?
- 5 fuel pumps
- Galley equipment
What happens when you push a Generator Drive Disconnect (DRIVE DISC) switch?
- Disconnects the IDG from engine when above idle speed
- Opens the relate Generator Control Breaker (GCB)
What condition would automatically disconnect the IDG if not manually disconnected by the flight crew?
Excessively high drive oil temperature
What does a Bus Isolation (ISLN) light illuminated indicate?
- BTB open
- AC bus isolated from synchronous bus
How do you reconnect an IDG that has been disconnected?
IDG cannot be restored by flight crew - maintenance required
How is the electrical system configured during an automatic ILS approach?
AC and DC busses 1, 2 and 3 are isolated from the sync bus. AC bus 4 continues to power the sync bus
What are the main AC electrical power sources?
- Four IDG’s
- Two APU generators
- Two external power sources
