Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
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
|