Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
ERJ 170 Electrical
Electrical systems questions
| Question | Answer |
|---|---|
| How many networks make up the electrical system on the airplane? Why? | • 2 independent networks• Redundancy and fault isolation |
| What happens if a power generating source fails? | • Bus ties automatically connect to provide no system degradation. |
| What components power the AC system? | • 2 Integrated Drive Generators (IDG)• Auxiliary Power Unit (APU)• Inverter• Ram Air Turbine (RAT)• AC GPU receptacle |
| What components power the DC system? | • 2 NiCad batteries• 3 Transformer Rectifier Units (TRU)• DC GPU receptacle |
| How does the IDG maintain a stable power output? | • A Constant Speed Drive (CSD) attaches the IDG to the AGB (Accessory Gear Box) |
| What monitors and controls the IDG’s? | • Each has a Generator Control Unit (GCU) |
| Can one IDG supply the entire electrical system? | • Yes |
| What will cause the amber IDG light on the overhead panel to illuminate? | • High oil temperature• Low oil pressure |
| If an IDG is manually disconnected can it be reconnected by the flight crew? | • No. This is a maintenance function |
| What is the primary purpose of the AC generators? | • To power the AC BUSSES and AC ESS BUS which…• Power the 3 Transformer Rectifier Units (TRU) 1, 2, and ESS |
| What is the purpose of the Transformer Rectifier Units? | • To convert 115 VAC to 28 VDC |
| Can the APU replace a failed IDG? | • Yes |
| What is the AC electrical system‘s priority? | • Onside (IDG)• Inside (APU)• Outside (GPU)• Cross-Side (Other IDG)Note: The airplane uses an onboard AC power source before an external AC source |
| How is it known that an AC GPU is hooked up to the airplane and ready to provide electricity? | • GPU button displays AVAIL and the GPU icon is presented on the electrical synoptic page• Once the GPU button is pushed in, the button will display IN USE provided another AC power source is not available |
| What does it mean if the AC GPU is plugged in and the outside GPU panel button displays IN USE? | • Ground service bus is in use• Cockpit GPU button will display AVAIL even though the ground service bus is in use |
| If the airplane is using the AC GPU and the APU is started what should the pilot be sure to do? | • Deselect the GPU button before the next GPU connection |
| What will charge the batteries? | • Any AC Power Source |
| How long will the aircraft’s batteries last with no recharging? | • 10 minutes |
| What is the purpose of the DC GPU receptacle? | • For APU start when batteries < 22.5 VDC, or• If battery temp is < -20°C |
| What is the minimum battery temp for APU start? | • -20°C |
| What is the minimum battery voltage to close the battery bus-ties? | • 18 volts |
| What battery is used for the APU start? | • BATT 2 powers the APU Start Bus• BATT 1 powers the FADEC & EICAS for monitoring |
| What is the purpose of the Inverter? | • Converts 28 VDC from the batteries to 115 VAC to power the AC STANDBY BUS when an AC source is not available |
| What is on the AC STANDBY BUS? | • Engine exciters 1A and 2A |
| What powers the Ram Air Turbine (RAT)? | • Airflow turns the RAT propeller which spins the turbine inside |
| When will the RAT deploy? | • Automatically deploys if AC BUSSES are not powered• Manually by pilot |
| How long after deployment before the RAT will supply power? | • 8 seconds |
| Is there a total loss of power during the 8 second RAT deployment? | • No. Batteries supply power to the DC ESS BUSSES and AC STANDBY BUS |
| What does the RAT power? | • ESS BUSSES |
| What is minimum airspeed for the RAT? | • 130 kts• Load shedding occurs below this speed |
| When is the RAT icon displayed on the electrical synoptic page? | • When the RAT is deployed |
| What manages the electrical system? | • 4 Integrated Control Centers (ICC)• 2 Secondary Power Distribution Assemblies (SPDA) |
| What is an ICC? | • An electrical control device, which provides power distribution and protection for electrical loads |
| What is an SPDA? | • An electrical load-management unit (powered by the ICC’s) that distributes electrical loads to aircraft systems according to distribution logic |
| Can the flight crew reset the ICC and SPDA remote electronic CBs? | • ICC CB’s can only be reset by maintenance on the ground• SPDA CB’s can be reset via the MCDU |
Created by:
rah170
Popular Quiz Bowl sets