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FO ERJ 175 Initial > Electrical Systems > Flashcards

Flashcards in Electrical Systems Deck (22)
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1
Q

The IDG’s provide what type of electrical power?

A

AC

2
Q

An engine can be started without AC power.

A

True

3
Q

Sources of AC power include:

A
  • GPU
  • RAT
  • IDGs
  • APU
4
Q

The TRU’s convert DC to AC power.

A

False

5
Q

The hot battery bus can power certain items when the airplane is powered down. What items are powered?

A
  • Fueling panel

- Engine fire fighting

6
Q

When should crews start the APU during normal operations?

A

10 minutes prior to pushback or as necessary for passenger comfort.

7
Q

In case of total AC power loss in flight

A

the RAT should automatically deploy and provide limited AC power.

8
Q

The E-175 has what types of circuit breakers?

A

Thermal and Electronic

9
Q

What is the minimum battery voltage for normal operation?

A

22.5 volts

10
Q

The OFF selection on the IDG selector mechanically disconnects it from the associated engine.

A

False

11
Q

What provides power to the DC ESS Buses when no AC power source is available?

A

Two 24V SLABs (Sealed Lead Acid Batteries)

12
Q

What would you do if you discovered a battery at 20.5 volts upon power up?

A

Call maintenance

13
Q

After starting the left engine with the APU on, what generator will power AC BUS 2? (Right engine is not running)

A

APU

14
Q

Sources of DC power include:

A
  • Battery

- GPU

15
Q

How many TRUs does the ERJ 175 have?

A

3

16
Q

How long does the RAT take to deploy?

A

8 seconds

17
Q

How fast must the aircraft be traveling for the RAT to spin up and begin operation?

A

150 KIAS

18
Q

How fast must the aircraft be traveling for the RAT to maintain operation once deployed?

A

130 KIAS

19
Q

When using DC power only, what does the AC stand-by bus power?

A

Igniters

20
Q

What does the RAT supply power to?

A

AC Essential Bus

21
Q

The source priority order for powering AC Bus 1 and AC Bus 2 is ___.

A
  • Respective IDG (Onside)
  • APU Generator (Inside)
  • AC GPU (Outside)
  • Opposite IDG (Cross-side)
22
Q

In an electrical emergency, how many minutes are the batteries capable of supplying essential systems to the airplane?

A

10