Electrical Flashcards
With external power (EXT) on, all generators and batteries are ______.
Offline no matter what you select.
NON ESS BUS 1 and 2 come online at _________, and shed _______.
Online @ 28 volts.
Shed automatically @ 24 volts.
The essential bus is powered by?
BUS 1 (default) or BUS 2, (never both at the same time, COV (changeover relay) automatically switches to the higher voltage if difference is above 3 volts.)
What switches the ESSENTIAL BUS power between BUS 1 and BUS 2? Whats the threshold?
Default BUS1, COR, threshold 3V to higher side.
The ESSENTIAL BUS can be powered by 24V or 28V?
T/F
TRUE
Name three ways to power the ESSENTIAL BUS?
LH/RH/APU Generators.
Batteries.
EXT power.
What are the consumers of AC power?
ice detector probe HEAT
horn HEAT
windshield HEAT
hydraulic PUMPS
The TRU rectifies _____ power to _____ power.
TRU rectifies AC power to DC power.
What uses AC inverter power?
EGPWS, TCAS, CVR, FDR, Trim Pointers
Name three items on the HOT BATTERY BUS?
Lights, refuel/defuel panel, squibs, COM 1 HOT button
Whats the BPCU?
Bus Power Control Unit (wife), will override certain selections based on logic.
What is a GCU?
Generator Control Unit.
What does the GCU do?
V-voltage regulation O-over voltage protection R-reverse current protection L-load sharing E-excess current protection G-ground fault
Can batteries be charged by external power?
NO
Generators come online @ _______.
55% N2
What doors have two sensors?
Main doors, Galley doors, Cargo door.
What doors have only one sensor?
Escape hatch, Emergency exits (2)
What doors use micro switches?
EXT AIR and GND AIR
