Electrical Flashcards
Q1: How many Amps are each TRU rated at?
A. TRU1: 350 Amps
TRU2: 350 Amps
TRU3: 225 Amps (additional 125 Amps dedicated to FBWPC)
Q2: Up to what altitude can the APU generator be used?
A. 41,000’
Q3: What is the maximum load on the AC generators?
A. 75 kVA continuous
Q4: What is used on the A220 to provide emergency AC power?
A. RAT (Ram Air Turbine)
QS: How many TRUs do we have on the A220?
A. 3
Q6. What are the two primary sources of AC power?
A. The 2 VFGs (variable frequency generator)
Q7. How many batteries do we have on the aircraft?
A.2
Q8. What types of batteries do we have on the aircraft?
A. NiCad batteries (Nickel Cadmium)
Q9. What are the 4 possible sources of AC power for the aircraft (ground and flight)?
A. 1. VFG’s 2.APU
3. EXT AC 4.RAT
Q1O. What does PMAG stand for? What is it used for?
A. Permanent Magnet Alternator/Generator
B. FBWPC’s (Alternate Source) and EEC of each FADEC
Q11. What are the 3 parameters checked when EXT AC power is connected to the aircraft?
A. Frequency, voltage and phase
Q12. When connected, if external AC power is suitable, what indication do you have on the overhead panel?
A. Green AVAIL light on the external power switch
Q13. In which condition does the RAT provides emergency AC power?
A. Complete loss of AC power
Q14. Where is the RAT stored?
A. Right side of the wing-to-belly fairing, near the right main landing gear
Q15. How many kVA is the RAT rated for?
A. 10 kVA
Q16. Other that supplying electrical power, the RAT also powers another component, what is it?
A. The RAT hydraulic pump
Q17. When does the RAT automatically deploy? What switch can manually deploy?
A. Full loss of AC power in-flight
B. RAT GEN switch
Q18. Which buses are powered by the RAT?
A. AC ESS Bus and DC ESS bus (through TRU3)
Q19. Which message comes on EICAS, when the batteries have been supplying
power for more than 5 minutes?
A. BATT DISCHARGING (caution msg) & horn alert outside
Q20. Which buses are powered when the EXT PWR switch is used on theoverhead
panel?
A. The entire electrical system
Q21. What is the purpose of the CABIN PWR switch? What does it isolate?
A. It is used to isolate cabin smoke sources by deactivating electrical loads. B. Galley(s)andin-flightentertainmentsystemsetc.
Q22. What is the purpose of the RAT GEN guarded switch?
A. Allows the flight crews to manually deploy the RAT
Q23. What is the purpose of the L DISC and R DISC guarded switches?
A. Allowsthecrewtodisconnecttherespectivegeneratorshaftfrom the accessory gearbox
Q24. Which message displays on EICAS in case of low oil pressure or high oil temperature?
A. L GEN OIL or R GEN OIL
Q25. Which DC bus is not normally displayed on the electrical page?
A. DC EMER Bus
Q26. What is the purpose of the BATT 1 & BATT 2 switches?
A. It allows the respective BATT DIR bus to be connected to its corresponding DC ESS bus
Q27. What is the purpose of the BUS ISOL switch in either MAIN or ESS?
A. It isolates the selected EPCs preventing automatic reconfiguring of the electrical load distribution.
Q28: What buses are Identified as the hot buses of the aircraft?
A. 1. DC EMER bus 2. BATT DIR BUS1 3. BATT DIR BUS2
Q29: What are the conditions in which the battery chargers will activate?
A. 1. Battery switch is in AUTO; and corresponding AC Bus is powered 2. If in Ground Service Mode Operation (regardless of Batt switch position)
Q30; Which buses are powered when the aircraft is in ground service mode (not including the hot buses)?
A. ACBUS1,ACBUS2& DCBUS1(FCOM17-2-5)
