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EMB-145 SYSTEMS > ELECTRICAL > Flashcards

ELECTRICAL Flashcards

1
Q

Will the OVRD switch
Batteries only
On ground
Connect shed buses?

A

No

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2
Q

AC system consists of:

A
  1. Inverter

Converts 28V DC to 115V AC

DC Bus1 - Inverter - 115 Vac Bus 
• EGPWS 
• Windshear 
• FOCWA
• Printer
• TCAS II (if installed)
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3
Q

What is EDL?

What does it control?

A

• Electrical Distribution Logic

Controls power contactors for:
• Fault protection
• Load shedding
• Electrical emergency opps.

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4
Q

What controls power contactors?

A

EDL

Electrical Distribution Logic

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5
Q

DC System consists of:

A

4 Engine Driven Gen’s (28V DC/400A)
1 APU Starter- Gen. (28V DC/400A)
2 Nickel-Cadmium Batt. (24V DC/ 44aph) 1 Lead-Acid Backup Batt. (24V DC/ 5aph) 1 GPU (28.5V 1600 amps)

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6
Q

GPU requirement volts and amps

A

28.5 volts 1600 amps

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7
Q

4 Gen ON

1 Gen OFF

A

2 Networks

All Buses

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8
Q

What happens when over current cond. exist or Bus fails?

A

EDL isolates the Bus

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9
Q

In the Air. Electrical Emergency
You have all screens ON.
What would you do?

A

Press Essential Power button….

That will connect batteries to ESS Buses

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10
Q

What powers Emergency Lights?

When will they come on automatically?

A

Powered by 4 batteries (22-24 hrs to charge them) Charged by ESS power. When switch in ARM lights will illuminate in electrical emergency. Otherwise controlled by CA of FA switches

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11
Q

3 Gen. ON

2 Gen. OFF

A

1 Network

All Busses

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12
Q

What converts

DC –> AC

A

Inverter

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13
Q

Why do we use Ni-Cad Batteries?

A

Discharge at the constant rate

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14
Q

Generators will come on line during start at…

% RPM N2

A

56.4%

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15
Q

If all generators fail ground? Air?

Electrical emergency

A

Batteries will supply system

Ground: 12 min. cuz they supply all buses

Air: 40 min. : Only essential buses are supplied, and central bus for APU start (3 attempts)
(Stb inst, Icas, RMU’s) - available instruments

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16
Q

2 Gen ON

3 Gen OFF

A

1 electrical network

NO SHED Buses

17
Q

What buses power
• Taxi lights?
• Nose landing lights?

A

Shed buses

18
Q

When (GPU Avail) but not selected
What Bus does it power?
And what’s on that Bus? (6)

A

(Ground Service Bus)

  • PAX Cabin light
  • Lavatory lights
  • Galley lights
  • Courtesy/ stairs lights
  • Cockpit dome lights
  • Baggage / service compartment lights
19
Q

EDL and GCU (gen. control unit)

Is powered by?

A

Backup Hot Bus
⬇️
Backup battery (only powers Backup Hot Bus)

20
Q

EFIS Power Source

A 
PFD1 - DC1
MFD1 - DC2
ISIS - ESS2
ICAS - ESS1
MFD2 - DC1
PFD2 - DC2

RMU1 - ESS1
RMU2 - ESS2
TBSH - DC2

21
Q

What generators charge the batteries?

A

Gen 1 and 3 charge Bat. 1 and
B/U Bat.

Gen 2 and 4 charge Bat 2

22
Q

What happens in generator over-voltage situation?

A

GCU takes the Gen offline

23
Q

Does the GPU. Have priority over Batteries and/or Generators?

A

YES, when selected

24
Q

How long Photoluminescence Emergency lights last?

A

Initially 4.75hrs after a 15mim charge

25
Q

ISIS on XR model is powered by what bus?

A

Backup Hot Bus

26
Q

Whats powered by backup battery?

A

EDL, GCU, ISIS (XR model)

27
Q

Will anti-ice come on in Electrical emergency?

A

NO, Anti-ice system is on DC buses

28
Q

What’s on the “Backup Ess Bus” ?

A

ICAS, DAU’s, AHRS 1

It’s powered by Batter 1

29
Q

How are batteries cooled?

A

By ram air from Naca air inlets

30
Q

Whats on a “HOT BUS 1”?

A
  • ELT
  • Engine #1 Fire EXTG (BTL A1)
  • Engine #2 Fire EXTG (BTL A2)
  • Fuel Press refueling
  • Fuel and Hydraulic valves
31
Q

Whats on “HOT BUS 2”?

A
  • Courtesy/ stair lights
  • Engine #1 Fire EXTG (BTL B1)
  • Engine #2 Fire EXTG (BTL B2)
  • Main door control
  • Fuel and Hydraulic valves
32
Q

What is AC power is controlled by?

A

AC Power button

33
Q

Will AC system work in Electrical emergency?

A

NO. AC inverter is powered my DC Bus 1

EMB-145 SYSTEMS (17 decks)

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