Electrical System Flashcards
Types of CB we have?
Thermal
Electrical (in MCDU)
How are the Batteries charged?
Through any AC power source
What is the GPU checked for before we get AVAL?
VOLTS/AMPS/FREQ
Power priority?
IDG, APU, GPU, OPPOSITE SIDE IDG
Important items on hot batt bus?
Refuel panel
Engine fire protection
What is the min battery voltage?
22.5v
21-22.4v requires recharge
When you turn on the batteries what are you looking for?
IESS
22.5 volts
screens 2 and 3
How do we check the battery temp?
We have to have AC power.
What does a TRU do?
AC>DC
What does our 1 inverter do?
Converts batt 1 DC to AC power for the ignitors for engine start without AC power
What is on AC essential bus?
Flap channel 1
Slat channel 2
ACFP 2
ACMP 3A
How long for RAT to deploy? What message should go away?
8 sec
BATTERY DISCHARGE
Why does battery 2 have an auto position?
Because it can either power either DC bus 2 or APU start bus
How long can batteries power essential loads?
10 min and 2 APU start attempts
How long should we wait after starting engine to disconnect the APU or GPU?
30 Sec
What will you have in an electrical emergency?
Screens 2,3
NAV 1/COM 1
IRS 1
CCD 1
FMS 2
MCDU 2
GPS 2
What EICAS messages will you get?
Electrical emer Batt Discharge (until RAT deploys)
What does the inverter do?
Powers the Ignitors
When the RAT deploys what message will go away?
BATT DISCHARGE
Does the RAT stay attached to the AC essential bus once normal AC power has be reestablished?
YES
What do we have to think about when RAT deploys prior to landing?
FLAP 3 Landing
Pump unloader VALVE system 3?
Lowers the amount of power to to start the pump?
Flow limiter system 3?
Limit the amount of power to keep the pump going.
