Q-ELECTRICAL AND APU Flashcards
How does the airstar work ?
Push the handle , hinge to the bottom. Can be opened either by the inside or outside
Can the baggage compartment be used as an emergency exit ?
NO
What Advisory light comes on when the gear is selected in the down position
The no smoking sign
Can the warning tones be heard through the speaker and the headset ?
Yes
What do the warning Tone generators provide
Warning Tones
IF one warning tone generator fails, is there any loss of VISUAL indications ?
NO
If a caution light illuminates does it stay flashing or steady ?
Steady
If a warning light illuminates, will it stay flashing or steady ?
Flashing
Will the Master lights illuminate steady or flashing ?
Flashing
In a condition that causes a master and a caution light to illuminate, then rectifies itself. Will the master light remain illuminated ?
YES
What busses are powered when the Master is turned ON ?
The left and right ESSENTIAL BUS
What busses are powered with the battery MAIN , AUX , and STBY battery ON ?
ESSENTIAL AND MAIN BUSSES
Which BUSSES are powered with the APU ON ?
All DC BUSSES
What Controls the 4 BUS TIE
EPCU
What is the maximum battery load for take off ?
0.10
What does a battery load of 1.05 indicate
Recharge of + 5%
What is the maximum AC generator load ?
1.0
What is the maximum true load ?
1.0
What is the Maximum DC load ?
1.0
What would a generator load of 1.05 indicate ?
An overload of the generator ?
Can the EPCU disconnect the bus tie if the bus tie switch is selected on ?
YES
When does the EPCU react to a main bus fault ?
High Current output for a generator
Will all busses be powered if both TRU’s Fail ?
YES
Which Battery is connected to the HOT battery bus ?
Standby
Which lights are on the HOT BATTERY BUS
Dome and Boarding Lights
When do the Emergency Lights automatically activate ?
Loss of the Left and DC Bus with the switch in the ARM position.
power loss to the left MAIN bus
How many evacuation exists are there in the passenger cabin ?
4
What does ANVS system provide ?
Reduce engine vibration
What is the maximum output rating for the DC generators ?
400 AMPS ( total of 800 AMPS )
What is the total maximum output rating of the TRU’s ?
300 AMPS ( 600 total )
When does the automatic load shedding of of the galley busses occur ?
if the left or right variable AC busses draw too much current the ties will open and not transfer to the opposite generator
What will cause the EPCU to react to a main bus fault ?
DC generator output
What will the EPCU do if it detects a main bus fault ?
It will isolate the bus by opening the main bus Tie and the right secondary TIE
Will all busses be powered if a DC generator fails ?
Yes by closing the man bus tie
Will all busses be powered if both DC generators fail ?
Yes by closing the main bus Tie
Will all busses be powered if both TRU’s ?
Yes through the secondary bus tie
Will all busses be powered if a TRU fails ?
Yes through the secondary bus tie
Will all buses be powered if an AC generator fails ?
NO, Galleyes are unpowered.
When does the EMERG LIGHTS DISARMED caution lights illuminate ?
when EMERG LIGHTS switch is in the Off Position.
What is the APU controlled by ?
APU FADEC
Can the APU bleed be on with the engine bleeds selected on ?
NO
With the APU operating, what busses are powered ?
All busses DC
What is an indication of an APU fail loop fault ?
Amber fault overhead caution.
Will the APU operate in flight
NO
How is the APU fire protected ?
Automatically by fire loop and extinguisher.
What are the indications of an APU fire ?
FUEL VALVE closed BOTTLE armed FIRE AND CHECK FIRE detection lights APU CAUTION LIGHT MASTER WARNING CHECK FIRE DET LIGHT
What is powered with the EXT power connected ?
All DC and AC busses are powered
How are the Generators powered ?
through accessory Gear Box
How long do the batteries provide power for the essential services ?
60 min
What are the 3 batteries connected to ?
The essential busses
What does selecting the battery MASTER switch do tho batteries ?
It’s closes 3 connectors and connects all three batteries to the essential busses
Where does the EPCU get it’s power from ?
It’s energized from the essential buss
What does the MAIN battery get connected to when the MAIN battery switch is selected to ON
It gets connected to the right MAIN bus
Selecting the AUX batt to ON will connect it to what ?
It connects it directly to the left MAIN buss.
What is the maximum battery load, and minimum battery temperature, allowed for take off ?
A load of .10 and not colder then -20
