ELECTRICAL Flashcards
What are the Main AC electrical power sources on the LCF aircraft?
•Four IDGs
•Two external power sources
FCOM 2 400-LCF, 6.20.1
What is the function of the Standby Power Switch in the Auto Position?
•Allows the main and APU standby busses to be powered
from available sources.
FCOM 2, 6.10.2
What does the “AVAIL” light indicate on the External and APU PWR switches?
The related power source (APU or EXT) is plugged in and available
and the power quality isacceptable.
FCOM 2; 6.10.4/.5
When is the main cargo deck handling bus powered?
When the “AVAIL” light is displayed on the APU 2 or EXT 2 switches.
FCOM 2; 6.10.4
What electrical power source provides power for the lower lobe cargo handling,
fueling panel, and AUX 4 hydraulic pump?
EXT PWR 1 or APU GEN 1 is AVAIL or selected ON
(powering the Ground Handling bus)
FCOM, VOL 2; 6.20.5
What are some of the equipment items powered by the Utility busses?
•5 fuel pumps
•Galley equipment
FCOM, VOL 2; 6.20.7
What happens when you push a Generator Drive Disconnect (DRIVE DISC) switch?
•Disconnects IDG from engine when above idle speed
•Opens related Generator Control Breaker (GCB)
FCOM, VOL 2; 6.10.6
What condition would automatically disconnect the IDG if not
manually disconnected by the flight crew?
Excessively high drive oil temperature
FCOM, VOL 2; 6.20.3
What does a Bus Isolation (ISLN) light illuminated indicate?
•BTB open
•AC bus isolated from synchronous bus
FCOM, VOL 2; 6.10.6 & QRH 6.5
How do you reconnect an IDG that has been disconnected?
•Maintenance action is required
•The IDG cannot be restored by flight crew action
FCOM, VOL 2; 6.10.6
How is the electrical system configured during an
automatic ILS approach (autoland)?
•AC and DC busses 1, 2, and 3 are isolated from the sync bus
•AC bus 4 continues to power the synchronous bus
FCOM, VOL 2; 6.20.8
What are the main AC electrical power sources?
•Four IDGs
•Two auxiliary power sources (APU generators)
•Two external power sources
FCOM, VOL 2; 6.20.2
