ELECTRICAL SYSTEM CBT Flashcards
WHAT IS THE ELECTRICAL SYNOPTIC PAGE?
PROVIDE VISUAL REPRESENTATION OF ELECTRICAL SYSTEM OPERATION AND PARAMETERS.
WHAT KIND OF ELECTRICITY DOES THE AIRPLANE RUN ON?
PRIMARILY AC BUT ALSO USES DC
WHAT IS AN INTEGRATED DRIVE GENERATOR?
IDG, IS THE INTEGRATION OF A CONSTANT SPEED DRIVE AND AN AC GENERATOR TO SUPPLY CONSTANT FREQUENCY AC POWER
HOW MANY IDGs NORMALLY POWER THE AIRPLANE?
2 ENGINE DRIVEN
HOW DO THE IDGs PRODUCE POWER?
THEY ARE DIRECTLY CONNECTED TO THE ENGINE OUTPUT VIA GEAR BOXES, AUTOMATICALLY ONLINE WHEN ENGINES STARTS.
WHERE IS THE PLUG IN FOR THE GPU? HOW DO WE USE IT?
BELOW THE CAPTAIN SIDES WINDOW
SYSTEM WILL CHECK FOR PROPER (VOLTAGE/AMERAGE/FREQUENCY) AND A GREEN “AVAIL” ON THE ELECTRICAL CONTROL PANEL ALLOWS USE TO USE IT AS THE PRIMARY POWER SOURCE. (PUSH IN)
WHAT IS THE APU? AND WHAT CAN IT PROVIDE?
AUXILIARY POWER UNIT, IT CAN PROVIDE POWER TO ALL ELECTRICAL POWER TO ALL BUSES.
PROVIDES SAME OUTPUT AS AN ENGINE DRIVEN GENERATOR
WHAT IS A TRANSFORMER RECTIFIER UNIT? HOW MANY TRUs AND HOW DO THEY FUNCTION?
TRU CONVERT AC POWER TO DC.
2 TRUs THAT FUNCTION INDEPENDENT OF EACH OTHER
AC STANBY BUS
POWERED BY A DC BUS THROUGH AN INVERTER.
POWERED ON WITH THE BATTERIES
ALLOWS FOR ENGINE START WITH NO AC POWER
WHAT IS THE AC ESSENTIAL BUS?
CONTAINS ALL THE ITEMS FOR SAFE OPERATION OF THE AIRCRAFT IN CASE OF AN ELECTRICAL FAILURE.
WHAT IS ON THE AC ESSENTIAL BUS?
AC FUEL PUMP 2A
ACMP 3A
SF-ACE 1 FLAP CH 1 AV FEED
SF-ACE 2 SLAT CH 2 AC FEED
WHAT IS THE RAM AIR TURBINE?
AC ELECTRAL DEVICE, CONVERTS KINETIC ENERGY INTO AC POWER.
POWERS ESSENTIAL SYSTEMS
HOW LONG WILL BATTERIES SUPPLY ESSENTIAL LOADS WITHOUT THE RAT?
10 MINUTES
WHAT HAPPENS IF AN AC POWER SOURCE FAILS?
THE AC BUSES AUTO CONNECTED BY BUS TIE CONTACTORS (BTCs). AND ONE AC POWER SOURCE IF ENOUGH TO RUN THE SYSTEM,.HOWEVER,GALLEY AND R. WINDHIELD HEAT POWER ARE AUTOMATICALLY SHED.
WHAT IS THE DC EXTERNAL POWER SOURCE USE FOR?
DC GPU, USED TO ASSIST WITH APU START.
RARELY USED.
WHAT TYPE OF BATTERIES DO WE HAVE? WHAT DO THEY POWER DIRECTLY?
TWO 24 V SLAB (SEALED LEAD ACID BATTERIES)
POWER THE DC ESSENTIAL BUSES AND THE HOT BATTERY BUSES.
WHY IS THE FUEL PANEL ON THE HOT BUS?
TO ALLOW FUELING AND DEFUELING WHEN THE AIRPLANE IS POWERED DOWN.
WHAT ELECTRICAL INFORMATION IS ON THE STATUS PAGE?
BATTERY VOLTAGE.
WHAT IS THE MINIMUM BATTERY VOLTAGE FOR NORMAL OPERATION? WHEN IS A MAINTENACE WRITEUP REQUIRED?
- 5V
21. 0V
WHAT DO THE IDG SELECTOR INDICATE?
AUTO: AUTO SUPPLIES AC POWER AFTER ENGINE START
OFF
DISC: MECHANICALLY DISCONNECT IDG (MUST BE HELD FOR 1 TO 3 SECONDS). MAINTENANCE IS REQUIRED
AMBER LIGHT INDICATES LOW/HIGH OIL PRESSURE, ALONG WITH EICAS MSG
WHAT DOES THE AC BUS TIE SELECTOR INDICATE?
1 OPEN: OPENS BTC 1, SEGREGATING AC BUS 1 FROM 2
AUTO
2 OPEN: OPENS BTC 2, SEGREGATING AC BUS 2 FROM 1
WHAT IS THE NORMAL OPERATION OF THE APU BUTTON?
NORMALLY PUSHED IN
TRU SELCTORS INDIATIONS?
AUTO: AUTO OPERATION
OFF: ISOLATES TRU FROM THE ASSOCIATED BUS
BATTERY 1 SELECTOR KNOB INDICATIONS?
ON: SUPPLIES POWER TO DUS BUS 1 AND HOT BATTERY BUS 1
OFF: ONLY SUPPLIES POWER TO HOT BUS 1
DC BUS TIE TOGGLE SWITCH INDICATIONS?
AUTO
OFF: OPENS BOTH ESSENTIAL TIE CONTACTORS (ETC) AND DC TIE CONTACTOR (DCTC)
BATTERY 2 SELECTOR KNOB INDICATIONS?
AUTO: AUTOMATICALLY POWERS DC BUS 2 OR APU START BU AND HOT BATTERY BUS 2
OFF: ONLY SUPPLIES POWER TO HOT BUS 2
WHAT TYPE OF CIRCUIT BREAKERS ON THE ERJ?
ELECTRONIC AND THERMAL
ELECTRONIC ARE ACCESSED THROUGH THE MCDU
SOME THERMALS ARE IN THE COCKPIT
WHEN DO WE USE THE RAT MANUAL DEPLOY?
AS DIRECTED BY THE QRH IN AN ELECTRICAL EMERGENCY.
