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A220 > Electrical > Flashcards

Electrical Flashcards

1
Q

Q1: How many Amps are each TRU rated at?

A

A. TRU1: 350 Amps
TRU2: 350 Amps
TRU3: 225 Amps (additional 125 Amps dedicated to FBWPC)

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2
Q

Q2: Up to what altitude can the APU generator be used?

A

A. 41,000’

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3
Q

Q3: What is the maximum load on the AC generators?

A

A. 75 kVA continuous

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4
Q

Q4: What is used on the A220 to provide emergency AC power?

A

A. RAT (Ram Air Turbine)

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5
Q

QS: How many TRUs do we have on the A220?

A

A. 3

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6
Q

Q6. What are the two primary sources of AC power?

A

A. The 2 VFGs (variable frequency generator)

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7
Q

Q7. How many batteries do we have on the aircraft?

A

A.2

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8
Q

Q8. What types of batteries do we have on the aircraft?

A

A. NiCad batteries (Nickel Cadmium)

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9
Q

Q9. What are the 4 possible sources of AC power for the aircraft (ground and flight)?

A

A. 1. VFG’s 2.APU
3. EXT AC 4.RAT

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10
Q

Q1O. What does PMAG stand for? What is it used for?

A

A. Permanent Magnet Alternator/Generator
B. FBWPC’s (Alternate Source) and EEC of each FADEC

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11
Q

Q11. What are the 3 parameters checked when EXT AC power is connected to the aircraft?

A

A. Frequency, voltage and phase

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12
Q

Q12. When connected, if external AC power is suitable, what indication do you have on the overhead panel?

A

A. Green AVAIL light on the external power switch

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13
Q

Q13. In which condition does the RAT provides emergency AC power?

A

A. Complete loss of AC power

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14
Q

Q14. Where is the RAT stored?

A

A. Right side of the wing-to-belly fairing, near the right main landing gear

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15
Q

Q15. How many kVA is the RAT rated for?

A

A. 10 kVA

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16
Q

Q16. Other that supplying electrical power, the RAT also powers another component, what is it?

A

A. The RAT hydraulic pump

17
Q

Q17. When does the RAT automatically deploy? What switch can manually deploy?

A

A. Full loss of AC power in-flight
B. RAT GEN switch

18
Q

Q18. Which buses are powered by the RAT?

A

A. AC ESS Bus and DC ESS bus (through TRU3)

19
Q

Q19. Which message comes on EICAS, when the batteries have been supplying
power for more than 5 minutes?

A

A. BATT DISCHARGING (caution msg) & horn alert outside

20
Q

Q20. Which buses are powered when the EXT PWR switch is used on theoverhead
panel?

A

A. The entire electrical system

21
Q

Q21. What is the purpose of the CABIN PWR switch? What does it isolate?

A

A. It is used to isolate cabin smoke sources by deactivating electrical loads. B. Galley(s)andin-flightentertainmentsystemsetc.

22
Q

Q22. What is the purpose of the RAT GEN guarded switch?

A

A. Allows the flight crews to manually deploy the RAT

23
Q

Q23. What is the purpose of the L DISC and R DISC guarded switches?

A

A. Allowsthecrewtodisconnecttherespectivegeneratorshaftfrom the accessory gearbox

24
Q

Q24. Which message displays on EICAS in case of low oil pressure or high oil temperature?

A

A. L GEN OIL or R GEN OIL

25
Q

Q25. Which DC bus is not normally displayed on the electrical page?

A

A. DC EMER Bus

26
Q

Q26. What is the purpose of the BATT 1 & BATT 2 switches?

A

A. It allows the respective BATT DIR bus to be connected to its corresponding DC ESS bus

27
Q

Q27. What is the purpose of the BUS ISOL switch in either MAIN or ESS?

A

A. It isolates the selected EPCs preventing automatic reconfiguring of the electrical load distribution.

28
Q

Q28: What buses are Identified as the hot buses of the aircraft?

A

A. 1. DC EMER bus 2. BATT DIR BUS1 3. BATT DIR BUS2

29
Q

Q29: What are the conditions in which the battery chargers will activate?

A

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)

30
Q

Q30; Which buses are powered when the aircraft is in ground service mode (not including the hot buses)?

A

A. ACBUS1,ACBUS2& DCBUS1(FCOM17-2-5)

A220 (21 decks)

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