Electrical Flashcards
The Electrical system consist of
______ volts AC
______HZ
______volts DC
115/200
400
28
What are IDGs?
What do they do?
Integrated drive generators
Provide AC power during flight
What is the RAT what does it do
Emergency Generator (Ram Air Turbine) supplies limited back up AC power
What does the AC & DC ESS bus’s do?
Makes sure essential equipment remains powered during electrical emergency.
Transformer Rectifiers (TR1&2)
Do what?
Convert AC power to DC power
The electric external plug is?
If voltage and frequency is acceptable what illuminates in cockpit?
Forward of nose gear wheel well
AVA light overhead
Does the APU Gen have as much power as engine driven Gen?
Can you use it with a single Eng Gen in flight?
Yes
Yes
Does External Power have priority over APU?
Yes
The IDG is cooled and lubricated by _________ independent of engine oil system.
Oil system
If you disconnect IDG in flight can you reconnect it in flight?
Only use the pb disconnect in ______ and must not be pressed for more than______?
IDG can only be reconnected by______?
No
Flight and 3 seconds
MX
What 2 things does the GCU do?
Controls Freq and Voltage
Controls the line contractor
On ELEC page is Gen is Amber and 1 is white what does it mean?
If Gen is Amber and 2 is Amber what does that mean?
Gen 1 is running but selected off
Gen 2 is not running.
What HYD System does RAT pressurize?
The HYD fluid then drives ______ Gen
Blue
Emergency
RAT automatically deploys when we loose______?
You can also manually deploy RAT. Be carefully doing it on the ground it could hurt someone.
AC BUS 1 & 2
AC ESS BUS in normal
Mode is usually powered by______?
AC BUS 1
AC BUS 2 is the alternate
Maint Bus on toggle switch is in the__________. When selected to on it will allow the _______buses to receive power on the ground.
When ground power is removed the MAINT BUS switch________?
Forward galley
AC & DC GRD/FLT BUS
Revert to off
Power priority for electrical system is________?
On side generator
External power
APU
Opposite side generator
With AC Bus selected Off can the electrical system be powered by APU or GPU?
No
When Engines are started and electrical system is operating normally. Elec power moves from APU to Engine Gen power
Commercial push button sheds 4 things
Cabin and cargo lights
Water and toilet systems
Drain mast ice protection
Passenger entertainment system
Are batteries continuously being charged when system is on?
No
To conserve battery power in emergency configuration APU start is inhibited for _____?
45 sec
APU Start in this configuration is not recommended.
RAT only works with speeds above______?
100kts
Below 100kts emergency power is provided by batteries.
Battery only power in emergency mode will give about ______min
30
