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Envoy E175 > Electrical Power > Flashcards

Electrical Power Flashcards

1
Q

AC system is ___V at ___Hz

A

115V at 400Hz

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2
Q

The AC system is supplied power from what sources?

A

2 engine driven Integrated Drive Generators (IDGs)
1 APU Generator
1 RAT Generator
1 AC external power input

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3
Q

DC system is __V

A

24V

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4
Q

The DC system is supplied power from what sources?

A

2 Nickel cadmium batteries
1 DC external power input
3 Transformer Rectifier Units (TRUs) convert AC to DC
1 Inverter converts DC to AC

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5
Q

What converts variable engine speed into constant generator supply?

A

Constant Speed Drive (CSD). One per engine

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6
Q

Each IDG generates constant frequency __ power at __kVA, ___V, ___Hz, _-phase

A

AC power at 40kVA, 115V, 400Hz, 3-phase

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7
Q

(T/F) The IDG oil system is liquid-cooled

A

False. Air cooled

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8
Q

If the amber light next to the IDG switch illuminates what does this mean?

A

The IDG OIL message is on EICAS and a manual disconnection of the IDG is required

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9
Q

(T/F) The APU generator needs to be manually turned on when the APU is to be used for AC power.

A

False. Pushing the APU GEN button disconnects the APU GEN

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10
Q

BATT DISCHARGING means what on EICAS?

A

The batteries are discharging, the generators aren’t working and the RAT should be deployed once all other options are checked

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11
Q

The only inverter on the aircraft is located where?

A

The FWD E-bay

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12
Q

BATT __ provides power for APU start

A

BATT 2

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13
Q

BATT 1 is located ____

BATT 2 is located ____

A

BATT 1 is located in the FWD E-bay

BATT 2 is located in the AFT E-bay

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14
Q

(T/F) During an APU start the battery contactor for battery 2 will automatically open, stopping supply to the other systems.

A

True

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15
Q

There are __ Integrated control centers (ICCs) installed on the aircraft. The L & R are located ____. The Emergency ICC is located ___. The Auxiliary ICC is located ____.

A

There are 4 Integrated control centers (ICCs) installed on the aircraft. The L & R are located Middle E-bay. The Emergency ICC is located FWD E-bay. The Auxiliary ICC is located AFT E-bay.

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16
Q

If a thermal circuit breaker trips, what EICAS message will be displayed and what color will it be?

Where can I find information on which circuit breaker tripped?

Can I reset these CB in air?

A

REMOTE CB TRIP
Blue

MCDU CB page

No. CB reset can only be done on the ground by mx

17
Q

The Left Integrated Control Center (LICC) provides power distribution and protection for:

A

AC BUS 1 / DC BUS 1
AC / DC ground service busses
Line replaceable modules (TRU1, GCU1, External power modules)
Several thermal CB’s

18
Q

The Right Integrated Control Center (RICC) provides power distribution and protection for:

A

AC BUS 2
DC BUS 2
DC ESS BUS 2
Line replaceable modules (TRU2, GCU2, AGCU, External power modules)

19
Q

The Emergency Integrated Control Center (EICC) provides power distribution and protection for:

A 
AC ESS BUS
DC ESS BUS 1
DC ESS BUS 3
AC STBY BUS
HOT BATT BUS 1
Line replaceable modules (ESS TRU, several thermal CBs)
20
Q

The Auxiliary Integrated Control Center (AICC) provides power distribution and protection for:

A

APU START BUS
HOT BATT BUS 2
Several thermal CBs

21
Q

There are ___ SPDAs installed and they’re located ____ and ____.

A

2
FWD E-bay
Mid E-bay

22
Q

(T/F) Remote CBs tripped in the SPDAs can be reset in the MCDU in the cockpit.

A

True

23
Q

Electrical system fault logic provides power in the following order:

A

Onside IDG
APU
GPU
Opposite IDG

24
Q

(T/F) One AC source can supply the entire electrical system

A

True

25
Q

(T/F) The DC ground port can only be used for APU start

A

True

26
Q

The AC GPU port is located ____. The DC GPU port is located ____.

A

AC is on the lower left hand side of the aircraft just below the cockpit
DC is located at the lower left side of the aircraft aft of the rear passenger door

27
Q

GPU CONNECTED EICAS message means what?

A

You have either an AC or DC GPU connected and you released the parking brake

28
Q

(T/F) A cabin depressurization will automatically disconnect the cockpit PC plugs and can be reset by pushing the PC button twice

A

True

Envoy E175 (22 decks)

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