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
