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Republic E170 > Electrical > Flashcards

Electrical Flashcards

1
Q

The AC system is composed of:

A
  • two integrated drive generators (IDGs)
  • one auxiliary power unit generator (APU)
  • one inverter
  • one Ram Air Turbine (RAT)
  • one AC external power unit
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2
Q

The DC system is composed of:

A
  • two NiCad batteries
  • three transformer rectifier units (TRUs)
  • one DC external power input
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3
Q

IDG 1 or 2 Selector Knob AUTO

A

allows automatic operation of the electrical system; closes IDG contactor connecting IDG to the respective AC BUS

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4
Q

IDG 1 or 2 Selector Knob OFF

A

opens IDG contactor isolating the IDG from the respective AC BUS

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5
Q

IDG 1 or 2 Selector Knob DISC

A

must be held for one second to mechanically disconnect the IDG.

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6
Q

APU Generator Button PUSH IN/OUT

A

IN - allows auto operation by connecting APU generator to the AC BUS TIE according to source priority
OUT - opens the APU generator contact

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7
Q

AC BUS TIES Selector Knob 1 OPEN/AUTO/2 OPEN

A

1 OPEN - opens the Bus Tie Contactor 1, segregating AC BUS 1 from AC BUS 2
AUTO - allows auto operation according to system logic
2 OPEN - opens the Bus Tie Contactor 2, segregating AC BUS 2 from AC BUS 1

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8
Q

GROUND POWER UNIT Button PUSH IN/OUT

A

IN - connects the AC GPU to the AC BUS TIE according to source priority
OUT - isolates the AC GPU from the AC BUS TIE

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9
Q

TRU Toggle Switches AUTO/OFF

A

AUTO - allows auto operation by connecting the TRU to their respective DC Bus
OFF - isolates the TRU from their respective DC Bus

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10
Q

BATT 2 Selector Knob AUTO/OFF

A

AUTO - allows auto operation by connecting battery 2 to the DC ESS BUS 2
OFF - the battery supplies power only to the HOT BATT BUS 2

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11
Q

DC BUS TIE Toggle Switch AUTO/OFF

A

AUTO - allows auto operation by controlling the operation of the DC Tie Contactors according to system logic
OFF - opens all tie contactors

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12
Q

BATT 1 Selector Knob ON/OFF

A

ON - the battery is connected to the DC ESS BUS 1

OFF - the battery supplies power only to the HOT BATT BUS 1

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13
Q

IDG and APU gen rating

A

115 VAC, 40 KVA, 400 HZ, three-phase

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14
Q

Can you reconnect an IDG after manual disconnection

A

NO

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15
Q

Describe the inverter

A

the AC/DC inverter converts 28 volt DC power from batteries to 115 volt AC power to supply the STANDBY AC BUS when an AC power source is not available

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16
Q

Ram Air Turbine rating

A

115 V, 15 KVA, 400 Hz, three-phase AC

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17
Q

When is the RAT automatically deployed

A

when the AC ESS BUS loses power

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18
Q

What buses does the RAT power after deployment

A

AC ESS BUS; DC ESS BUSES are powered through the ESS TRU

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19
Q

What hydraulic system does the RAT power after deployment

A

AC motor driven hydraulic pump (ACMP 3A) from primary flight control tasks

20
Q

Min speed for RAT to power AC/DC ESS BUSES

A

130 knots

21
Q

What will a DC GPU provide power for

A

APU START BUS

22
Q

TRUs are rated at

A

300 A; convert 115 VAC into 28 VDC

23
Q

TRU 1 provides power to

A
  • DC BUS 1
  • DC ESS BUS 1
  • DC GND SVC BUS
  • HOTT BATT BUS 1
  • Batt 1 charging
24
Q

TRU 2 provides power to

A
  • DC BUS 2
  • DC ESS BUS 2
  • HOT BATT BUS 2
  • Batt 2 charging
25
Q

TRU ESS provides power to

A
  • DC ESS BUS 3
26
Q

Battery rating

A

NiCad 24 VDC, 27A

27
Q

How are batteries charged

A

any AC source through the TRUs including the GPU and RAT

28
Q

Battery power will last how long in an emergency with RAT not fully deployed or RAT stalled

A

10 minutes

29
Q

Minimum temperature for Batt 2 for APU start

A

-20ºC

30
Q

What provides power for APU start with DC GPU connected

A

DC GPU and not Batt 2

31
Q

When is the DC GPU used

A

when batt 2 is not available or temp is below -20ºC

32
Q

What is an ICC

A

Integrated Control Center is an electrical-electronic integrated device providing power distribution and protection for the airplane electrical loads, the secondary power distribution assemblies (SPDAs) and the circuit breakers that are located on the cockpit sidewall panels

33
Q

Name the four ICCs and their locations

A
  • left integrated control center (LICC) in Center E-BAY
  • right integrated control center (RICC) in Center E-BAY
  • emergency integrated control center (EICC) in FWD E-BAY
  • auxiliary integrated control center (AICC) in AFT E-BAY
34
Q

What is an SPDA

A

Secondary Power Distribution Assemblies - electrical load management unit that received power from the ICC AC/DC electrical buses and distributes it to the airplane systems

35
Q

Where is SPDA 1 located

A

FWD E-BAY

36
Q

Where is SPDA 2 located

A

Center E-BAY

37
Q

Which remote CBs can the flight crew reset?

A

SPDA; ICC must be reset by Mx on ground

38
Q

Electric source priority

A
  1. Respective IDG
  2. APU Gen
  3. GPU
  4. Opposite IDG
39
Q

BATT 1 or 2 OVERTEMP warning

A

associated battery temperature is above 70C

40
Q

BATT DISCHARGING warning

A

batteries are discharging in an electrical emergency with no RAT assistance, or on the ground when the battery is the only power source supplying the airplane

41
Q

ELEC EMERGENCY warning

A

in flight, AC main buses are de-energized

42
Q

GPU CONNECTED caution

A

AC or DC GPU connected and parking brake released

43
Q

IDG 1 or 2 OIL caution

A

high oil temp or low oil pressure; QRH will lead to disconnect IDG

44
Q

REMOTE CB TRIP advisory

A

remote thermal or electronic CB has been tripped

45
Q

What items are connected to DC HOT BATT BUS 1?

A 
Batt 1
Courtesy/Service lights FWD
DC Ceiling Lights
Engine 1 Oil level indication (in engine oil panel)
Engine 1A fire extinguisher
Engine 2A fire extingusher
Engine 1 Fuel SOV
Hydraulic 1 SOV
45
Q

What items are connected to DC HOT BATT BUS 2?

A 
Batt 2
CMC
Engine 1B Fire Extinguisher
Engine 2B Fire Extinguisher
Engine 2 Fuel SOV
Hydraulic 2 SOV
Refueling Panel
Water/Waste system Controls

Republic E170 (22 decks)

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