Electrical Flashcards
The ground service bus is normally powered by the ____.
Right Main AC Bus
Whenever the right main bus is powered, the ground service bus is powered.
TRUE
To allow for automatic landings with the lowest possible minimums, the electrical system configures so that each of the 3 autopilots is powered by a separate power source.
TRUE
If the ADIRU switch is left on after alignment and all electric power is switched off, the ADIRU continues to operate and the Nose Gear Horn sounds.
True
The primary electrical power sources for the flight control Power Supply Assemblies (PSAs) are the ____.
permanent magnet generators (PMGs)
The ground handling bus can be powered by ____.
primary external or APU power
Voltage of the main battery is read on the ____.
ELECTRICAL synoptic
After the loss of AC power, when the RAT electrically load sheds or prior to RAT deployment, the ____ powers the standby power system.
main battery
Primary external power and the APU are the two possible sources of power for the Ground Handling Bus.
TRUE
What indicates that external power is connected to the airplane and is of usable quality?
The AVAIL light is illuminated.
When the APU is running and primary external power is on line, the APU powers ____.
the left main bus
Backup power to the Transfer Buses is provided by one variable speed/variable frequency generator mounted on each engine. Which of the following is true regarding the Backup AC Electrical System?
A frequency converter converts the backup generator frequency to a constant 400 hz.
If the RAT fails to deploy automatically, can the crew deploy it manually?
Yes, by the RAM AIR TURBINE switch located on the hydraulic panel.
Illumination of the Ram Air Turbine PRESS light on the hydraulic panel indicates that the ____.
center system primary flight control hydraulic pressure is greater than 1500 psi
For primary electrical power system failures, the standby electrical system provides ____.
both AC and DC power