ELECTRICAL SYS Flashcards
WHICH SYSTEM POWERS THE ELECTRICAL SYS OF THE B787?
ENGINE START
PRESSURIZATION
WING ANTI-ICE
STABILIZER TRIM
WHEEL BRAKE SYSTEM
WHICH TYPE OF FREQUENCIES IS THE ELECTRICAL SYSTEM USING?
PRIMARLY 115VAC ,28 DCV AND SOME LIMITED NUMBER OF SYSTEMS USING 235 Vac
WHAT ARE THE ELECTRICAL POWER SOURCE IN ELECTRICAL SYS?
4 VFSG (VARIABLE FREQUENCY STARTER/GENERATOR)
2 VFSG APU
3 EXT POWER RECEPTACLE
1 RAT
MAIN BATTERY
APU BATTER
3 FLIGHT CONTROL PMG (PERMANENT MAGNET GENERATOR)
2 EEC PMA
HOW MANY VFSG HAS EACH ENGINE?
2 EACH OF 235 VAC
WHICH SOURCE CAN PROVIDE ELECTRICAL POWER TO START THE ENGINE?
APU,EXT POWER OR OTHER ENGINE RUNNING
HOW CAN BE DISCONNECTED EACH VFSG IN THE ENGINE?
AUTOMATICALLY OR MANUALLY, ONCE DISCONNECTED ONLY ENGINEER CAN CONNECT IT AGAIN
WHAT THE APU GENERATORS CAN PROVIDE?
ELEC POWER ON GROUND AND IN FLIGHT
HOW MANY VFSG HAS AN APU?
2
WHO CAN POWER THE START OF THE APU?
EXT POWER, APU BATTERY OR ENGINE GENERATED POWER.
WHICH GENERATOR IS USED TO START THE APU WHEN USING APU BATTERY?
THE RIGHT GENERATOR ONLY
How many EXT power receptacles are installed on B787
Total of 3, two FWD and 1 in the AFT
When GROUND HANDLING mode is energized ?
Only one connection required to power this mode
TO POWER THE ENGINE START HOW MANY kVA ARE REQUIRED?
90 Kva
HOW TO START THE ENGINE USING EXT POWER?
EITHER USING THE FWD 2 ONLY AND IN THIS CONFIGURATION ANY ENGINE CAN BE STARTED FIRST OR USING 3 CONNECTIONS BUT IN THAT CASE THE RIGHT ENGINE MUSTBE STARTED FIRST.
HOW MANY STARTED GENERATORS ARE USED TO START THE ENGINE IN EXT PWR?
1 VFSG IS USED
WHEN THE RAT DEPLOY AUTOMATICALLY IN FLIGHT?
LOSS OF BOTH ENGINE
LOSS OF ALL THREE HYDRAULICS
LOSS OF ELECTRIC POWER OF CPT AND FO INSTRUMENTS
LOSS OF ALL 4 EMP AND A FAULTS OCCURS ON THE FLIGHT CONTROLS SYS ON APPROACH
LOSS OF ALL 4 EMP AND ENGINE FAILS IN TAKE OFF OR LANDING
THE MAIN BATTERY SUPPLY POWER TO?
AIRPLANE POWER UP
APU START (ASSIST APU BATTERY)
REFUELING OPERATIONS
TOWING OPERATIONS
ELECTRIC BRAKING (AS BACKUP)
CPT FLIGHT INSTRUMENTS (UNTIL RAT DEPLOYMENT)
APU BATTERY ON GROUND PROVIDES POWER TO?
APU START
NAVIGATIONS LIGHTS
WHICH PROTECTION SYSTEMS IS PROVIDED FOR THE BATTERIES?
AN OVERCHARGING OF FAULT MONITORING SYSTEM IS PROVIDED TO STOP CHARGING OR ISOLATING THE BATTERY IF NECESSARY.
IF EITHER BATTERY EXPERIENCES A SEVERE FAILURE WHAT WILL HAPPEN?
HEAT AND GASSES WILL BE DISCHARGED OVERBOARD
HOW MANY PMG (PERMANENT MAGNET GENERATOR) ARE INSTALLED IN B787
TOTAL OF 3
WHICH SYS THE PMG ARE POWERING?
FLIGHT CONTROLS ELECTRONICS
WHICH IS A SECONDARY POWER SOURCE FOR THE FLIGHT CONTROLS SYSTEM?
28 VDC BUS DISTRIBUTION SYSTEM AND MAIN BATTERY
HOW MANY PMA (PERMANENT MAGNETIC ALTERNATORS) ARE AVAILABLE ON B787?
2 ENGINE DRIVE PMA
WHAT THE PMA ARE POWERING?
EEC
WHICH IS A SECONDARY POWER SOURCE FOR THE EEC?
THE 115 VAC BUS DISTRIBUTION SYSTEM
HOW MANY RPDU WE HAVE ON BOARD?
17
HOW MANY 235 VAC BUSES WE HAVE ON BOARD?
4 MAIN BUSSES L1 L2 R1 R2
ON GRD FROM WHICH SOURCE THE BUSSES ARE ENERGIZED?
IF ONLY EXT POWER IS CONNECTED , FROM THE 115 VAC BUS SYSTEM, IF APU IS ON FROM THE APU 235 VAC
WITH APU AND ENGINE RUNNING HOW THE 235 VAC BUSSES ARE POWERED
2 EACH
How does it work the power distribution system?
High load are distribute by bus while the low load are using RPDU
