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44 Cards in this Set

  • Front
  • Back
Name the different sources of electrical power
IDG's, APU Gen, EXT PWR, Batteries, Battery Charger
Where is the IDG located?
One IDG for each engine
What cools and lubricates IDG?
Oil
What electrical bus is ALWAYS powered?
Battery Direct Bus
How many and what type of batteries are installed?
3 NiCad batteries connected in series
How long will batteries supply power?
60 min
With no other source of electrical power, what is being powered when the battery switch is placed on?
-Battery Direct Bus
-DC Transfer Bus
Waht relay does the Battery Switch operate?
Battery Relay
When does the Battery Charger operate?
The charger converts AC power supplied from the ground service AC bus to DC power to keep the main batteries fully charged.
Will batteries charge with Battery Switch OFF?
Yes, battery charging is not affected
What else does the Battery Charger do when there are no TR's available to the DC transfer bus?
All DC Transfer bus loads will be powered by the batteries and the battery charger working in the TR mode.
What is an EPCU and what does it do?
Electrical Power Control Unit - controls most electrical system operations automatically
NBPT, Auto-Energize, Galley power shed, ext pwr control, DC tie relay control
What is PCDU and what does it do?
Power Conversion and Distribution Unit - 3 PCDU's located in E&E comp. A different PCDU controls each generator. The PCDU receive power from their respective IDG or APU gen, then distributes to main bus.
What does PCDU consist of?
GEN control unit
TR
Bus Tie or EXT PWR Relay
DC tie relay
protective CB's
What is the function of a Transformer Rectifier?
Converts AC into DC power
What is NBPT?
No Break Power Transfer - momentarily paralleling on coming and off going power sources on the same bus. Will NOT function if EPCU is inop. A break power transfer may occur if the EPCU has insufficient time to accomplish power source paralleling if there is a complete loss of power.
What important items are on the DC Transfer Bus?
Fire protection and detection
What are the power source priorities to the AC Gen Bus?
1. Onside IDG
2. APU Gen
3. EXT PWR
4. Opposite side IDG
What is the power source priority to the AC Tie Bus?
1. APU
2. EXT PWR
3. Right AC system
4. Left AC system
Are the AC Electrical Buses normally paralleled or isolated from each other?
Isolated - generator buses remain isolated from each other and receive power from their respective IDG
When do the DC Tie Relays close?
AUTO - The DC bus tie relay switches are automatically closed or opened to maintain DC power to all DC buses
What is the procedure for resetting tripped CB's?
All CB's can be reset once except for Fuel pump and Aux HYD pump CB's. MUST observe 2 minute cooling period. (Also Galley and Lav flush)
Why is the Battery Switch required to start the APU?
Because the APU uses the batteries for starting.
What happens when the Bus Tie Switch is in the auto position?
Generator bus to tie bus connection is controlled automatically as required.
What happens when the Generator Switch is placed into the OFF position?
Disconnects the generator from its respective generator bus
What happens when the DC Tie switch is placed into the OPEN position?
Opens all three DC bus tie relays. Used during smoke procedures or testing.
What is indicated when the Blue APU /L GEN/ R GEN/ EXT Lights are illuminated?
Illuminated Blue to indicate which power source (if it's an alternate source) is supplying power to the associated bus.
How many times can a Generator be reset?
Once
What is the "normal" position of the EXT PWR switch if it is not in use?
OFF
When disconnecting External Power, what must be done before "pulling the plug"?
EXT PWR switch should be off. Ground crew should not pull power until the EXT PWR NOT IN USE light is illuminated on the Ground Power Panel
What is a procedure limitation when conducting the Emergency Power Test?
If "BATT CHARGING" alert is displayed, do not perfrom test.
Describe Emergency Power test
EXT PWR or APU is supplying power to generator buses. Battery Switch is ON. Rotate EMER PWR to ARM and look for "ON" illumination and "EMER PWR TEST" on EAD
How is a successful Emergency Power Test indicated?
After 1 minute, "EMER PWR TEST FAIL" not displayed on EAD and ON light extinguished
How is a failed EMER PWR TEST indicated?
"EMER PWR TEST FAIL" displayed on EAD
How is a failed Bus displayed on the SD?
Amber
What switch must be ON for Emergency Power to automatically activate?
Battery Switch
What is the alternate power source for the Emergency Power buses?
Aircraft Batteries
What 4 buses are powered with the Emergency Power Switch ON?
DC Transfer Bus
Battery Direct Bus
Emergency DC bus
Emergency AC bus (via emergency inverter)
What converts Battery DC to AC when on emergency power?
Emergency Inverter
How can you determine if Emergency Power is activated?
EMER PWR "ON" illuminates and EMER PWR ON is displayed on electrical synoptic
How long will Emergency Power last?
60 minutes
What systems will be available on Emergency Power?
DU 1-3 (VIA-1), ISIS, Manual Pressurization, Fire detection/protection, CAWS/EAD, FADEC (EEC 1-2), DC Start Pump, APU start system, FMC 1 (standby), ADIRU 1, VHF 1, MMR 1 (GPS/ILS only, no DME), VOR 1, Captain ACP (FO transmit on VHF-1 and INT), PA Handset.
What powers VIA-1?
Emergency DC
What powers VIA-2?
Right DC