Electrical

Question 1

What type of circuit breakers does the E175 have?

Answer 1

Thermal and Electronic

Question 2

What is the purpose of the TRU?

Answer 2

Convert AC to DC

Question 3

What are sources of AC power?

Answer 3

IDG
APU
GPU
RAT

Question 4

When can you start the APU during normal operations?

Answer 4

10 mins prior to pushback

Or as necessary for passenger comfort.

Question 5

What is the minimum battery voltage for normal operations?

Answer 5

22.5 volts

Question 6

Can you start and engine without AC power?

Answer 6

Yes.

Question 7

What type of power does the IDG provide?

Answer 7

AC

Question 8

What should happen during a total loss of AC power in flight?

Answer 8

The RAT should deploy and provide AC power to the AC Essential Bus.

Question 9

What items can the hot battery bus power?

Answer 9

Fuel Panel

Engine Fire Fighting

Question 10

How do you manually disconnect the IDG?

Answer 10

Place the control knob to the DISC position.

Question 11

What are the sources of DC power?

Answer 11

DC GPU

Battery

Question 12

What converts AC to DC?

Answer 12

TRU

Question 13

How many TRUs do we have?

Answer 13

3

TRU 1, 2 and ESS

Question 14

How do we check digital circuit breakers?

Answer 14

MCDU

Question 15

How do we check thermal circuit breakers?

Answer 15

CB Panel

Question 16

How much time do we have on battery power alone?

Answer 16

10 minutes

Question 17

What are the electrical power priorities?

Answer 17

Onside - same side IDG
Inside - APU
Outside - GPU
Cross side - Opposite IDG

Question 18

How long does it take for the RAT to deploy?

Answer 18

8 seconds

Question 19

When do the RAT deploy?

Answer 19

When there is AC power interruption

Question 20

What KIAS is required to spin up the RAT?

Answer 20

150 KIAS

Question 21

What is the minimum airspeed to provide electrical power from the RAT?

Answer 21

130 KIAS

Question 22

What equipment is on the DC Standby Bus?

Answer 22

Igniters

Question 23

What AC bus is powered when only DC is available?

Answer 23

AC Standby Bus

Question 24

What equipment is on the AC Essential Bus?

Answer 24

3221

3 HYD 3A
2 Fuel Pump 2
2 Slat ch 2
1 Flaps ch 1

Question 25

When should you see cross side power?

Answer 25

Single engine taxi

Question 26

What does the amber light indicate on the IDG panel?

Answer 26

High oil temp | Low oil pressure

Question 27

What does the DISC setting on the IDG panel do?

Answer 27

Hard mechanical disconnect

Question 28

After starting the left engine, with the APU what will power the opposite AC BUS?

Answer 28

APU

Question 29

What will happen if you leave the GPU button pressed after being disconnected from external ac power?

Answer 29

The airplane will not allow you to reconnect until recycling the button

Question 30

With a non annunciated aft cargo fire, how many times do you need to press the button to discharge the low-rate bottle?

Answer 30

3 times 1. Arm 2. High 3. Low

Question 31

When the captain calls “Flaps 1, APU off, flight control check” what should you do for a proper power transfer?

Answer 31

Wait 30 seconds after N2 stabilizes to shut down APU. APU has a 1 minute cool down where it still provides electricity

Question 32

During an electrical emergency, how many minutes power are the batteries capable of supplying?

Answer 32

10 minutes

Question 33

If you see ELEC EMERGENCY EICAS how much time do you have?

Answer 33

RAT should deploy in 8 seconds | If you cannot deploy you have 10 minutes of battery

Question 34

Can the RAT charge the battery?

Answer 34

Yes, the RAT can charger the BATT by converting AC to DC via TRU

Question 35

What is piece of equipment has the biggest draw on the RAT?

Answer 35

HYD 3A

Question 36

How does HYD 3A reduce draw on the RAT?

Answer 36

Unloader valve | Flow limiter

Question 37

When would the IDG LEDs turn on?

Answer 37

HOT LOP

Question 38

What does auto allow the IDG to do?

Answer 38

Allows for cross-side power

Question 39

What are the airplanes power priorities?

Answer 39

IDG, APU, GPU, Cross-side IDG

Question 40

If you turn the IDG to off then to auto will you get power | back?

Answer 40

Yes

Question 41

If you turn the IDG to DISC then to AUTO will you get | power back?

Answer 41

No its a one time mechanical disconnect

Question 42

What position does the GPU switch need to be in to | accept power?

Answer 42

Out

Question 43

What is the normal position of the AC bus tie switch?

Answer 43

Normal position is auto

Question 44

When do we take the AC bus tie switch out of auto?

Answer 44

When directed by a QRH procedure

Question 45

What does auto allow the bus tie to do?

Answer 45

It allows bus ties to be open or closed

Question 46

Where does APU GEN switch normally start?

Answer 46

In

Question 47

Why does the APU GEN switch start in?

Answer 47

To allow APU to pick up power right away

Question 48

What is the purpose of the TRU?

Answer 48

Convert AC to DC

Question 49

How do we charge batteries in flight?

Answer 49

AC power is converted by the TRU DC inverter to charge the batteries

Question 50

Which TRU will we use in electrical emergency?

Answer 50

TRU ESS

Question 51

What does TRU ESS do for us?

Answer 51

Allows the RAT to charge batteries in electrical emergency

Question 52

How long should it take to deploy the RAT?

Answer 52

8 seconds

Question 53

How do we know when the RAT is operating?

Answer 53

BATT discharge goes away

Question 54

When we still have the BATT discharge goes away what AC buss do we have?

Answer 54

AC STBY BUS

Question 55

What is on AC STBY BUS?

Answer 55

Igniters

Question 56

What is on AC ESS BUS?

Answer 56

3-2-2-1 Hydraulics 3A, AC fuel pump 2, Slat ch 2, Flap ch 1

Question 57

Which battery can be differed easier?

Answer 57

BATT 2 | APU FADEC on BATT 1, APU stater On BATT 2 - can be replaced with DC GPU

Question 58

Why is battery 2 OFF/AUTO?

Answer 58

Auto allows power to be replaced by DC GPU

Question 59

When DC is first applied what is available?

Answer 59

Screens 2/3 IESS 22.5 volts, no lower than 21.0 to charge, lower than 21.0 Call Mx

Question 60

What page is available on MFD where there is only DC power?

Answer 60

Status

Question 61

Can we move the plane while IESS is turning on?

Answer 61

No

Question 62

How long does IESS take to warm up?

Answer 62

90 seconds

Question 63

What happens when we have AC power established (1 of 3 things)?

Answer 63

Electrical PBIT (ACEs FCMs for out of tolerance conditions)

Question 64

How long does E PBIT take?

Answer 64

3 minutes

Question 65

How many ways are there to to interrupt the E-PIT

Answer 65

3 ( ac power, all hydraulic are pressurized, flight control mode switches) Windshield power up PBIT

Question 66

When will the power up PBIT begin?

Answer 66

When two AC sources are on. Single engine taxi only one works IRS begins alignment

Question 67

How long does IRS alignment take?

Answer 67

Up to 17 minutes to align, can align in flight

Question 68

Where is BATT temp displayed?

Answer 68

Electrical Synoptic Page

Question 69

What should you do if you get a BATT Over Temp Message?

Answer 69

Memory item - Effected battery OFF

Question 70

How do we convert DC to AC?

Answer 70

Inverters

Question 71

When should you turn on ADS probe heat before engine start?

Answer 71

-18 C before FFOD, erroneous readings, contamination, less that 0 with visual moisture

Question 72

What could erroneous ADS indications effect?

Answer 72

It could cause the E-PBIT to fail

Question 73

How does starting an engine effect the ADS probe heat?

Answer 73

Starting the engine activates the ADS probe heaters If they were pressed in prior to start, you need to turn them off because it inhibits system logic and will turn the probes off. ADS probe heat is always on when engine(s) are started

Question 74

What COM/NAV equipment do we have durning an electrical emergency?

Answer 74

CA: NAV 1 IRS 1 CCD 1 FO: COM 2 MCDU 2