Electrical Flashcards

1
Q

Components of Electrical system (AC and DC)

A

AC:

  • 2 x IDGs
  • 1 x APU gen
  • 1 x inverter
  • 1 x Ram Air Turnine (RAT)
  • 1 x AC external power

DC:

  • 2 x Nicad Batteries
  • 3 x TRUs
  • 1 x DC external power
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2
Q

AVAIL light on GPU button

A

AC GPU is connected to the airplane and AC power quality requirements (voltage/amperage/frequency) are satisfied

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3
Q

Amber dashes on Electrical synoptic page

A

output is invalid or out of range

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4
Q

Output rating of IDGs and APU Gern

A
  • 40 kVA
  • 115 VAC
  • 400 Hz
  • 3 phase
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5
Q

When are IDGs automatically disconnected?

A
  • manual disconnection is not performed, and

- the IDG oil temperature reaches 366°F (185.6°C)

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6
Q

Output rating of Ram Air Turning

A

15 kVA
115 VAC
400 Hz
3- phase

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7
Q

Speed required to ensure RAT supplies AC/DC ESS Buses

A

130 knts

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8
Q

How long for RAT deployment

A

8 secs

*Batts supply backup power to DC ESS and STANDBY AC during rat deployment

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9
Q

Output of TRUs

A
  • 300 Amps
  • primary source of DC power
  • converts 115 VAC —> 28VDC
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10
Q

TRUs provide DC power to which busses?

A

TRU 1 —> DC BUS 1, DC ESS BUS 1, DC GND SVC BUS, HOT BATT BUS 1 and battery #1 charging

TRU 2 —> DC BUS 2, DC ESS BUS 2, HOT BATT BUS 2 and battery #2 charging
TRU ESS —> DC ESS BUS 3

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11
Q

Output of Nicad batteries

A
  • 22.8 VDC
  • 27 A
  • can supply electrical loads for 10 mins without help from GPU
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12
Q

Components of electrical power distribution and control

A
  • 4 x Integrated Control Center (ICCs):
    • Left Integrated Control Center (LICC)
    • Right Integrated Control Center (RICC)
    • Emergency Integrated Control Center (EICC)
    • Auxiliary Integrated Control Center (AICC)
  • 2 x Secondary Power Distribution Assemblies (SPDAs)
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13
Q

Electrical Bus locations

A

LICC - AC BUS 1, AC GND SVC BUS, DC GND SVC BUS, DC BUS 1
RICC - AC BUS 2, DC BUS 2, DC ESS BUS 2
EICC - AC ESS BUS, STBY AC BUS, DC ESS BUS 1, DC ESS BUS 3, HOT BATT BUS 1
AICC - HOT BATT BUS 2, APU START BUS

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14
Q

Which buses power the SPDAs

A

SPDA 1 - DC BUS 1 , DC ESS BUS 1, DC ESS BUS 2, DC GND SVC BUS

SPDA 2 - DC BUS 2, DC ESS BUS 1, DC ESS BUS 2, DC GND SVC BUS

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15
Q

Which CBs can be monitored by the flight crew

A
  • Thermal non remote CBs located in the cockpit

- Electronic remote CBs located inside the SPDAs

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16
Q

Electrical source priority

A

– Respective IDG.
– APU generator.
– GPU (on ground without APU).
– Opposite IDG

17
Q

Which components are commanded off by SPDA during load shedding

A

– Galleys and;

– Right windshield heating.

18
Q

How long can the batteries supply electrical power

A

10 mins

19
Q

IDG OIL message

A
  • Low Oil Pressure, or

- High Oil Temp

20
Q

Which busses does the RAT power when deployed?

A
  • AC ESS Bus
  • AC STBY Bus

Via ESS TR:

  • DC Bus 1
  • DC Bus 2
  • DC Bus 3