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SYSTEMS > Electrical System > Flashcards

Electrical System Flashcards

1
Q

NATOPS Chap 2

Electrical System

The Primary source of AC power is… Secondary Source?

A

Two AC generators which are driven by the transmission.

The APU Generator

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2
Q

NATOPS Chap 2

Electrical System

How is DC Power provided to system?

A

Two DC converters turn 115 VAC power into 28 VDC power.

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3
Q

NATOPS Chap 2

Electrical System

What is the battery, and what is it used for?

A

The battery is a 24v Nickel Cadmium installed primarily to start the APU and power the Battery Util Bus.

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4
Q

NATOPS Chap 2

Electrical System

Describe the 3 Gens?

A

Oil cooled 30/45 K-VA, 115 VAC, 3-phase, 400Hz for Gen 1/2

Air cooled 35 K-VA, 115 VAC, 3-phase, 400Hz for APU Gen

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5
Q

NATOPS Chap 2

Electrical System

What does a GCU do?

A

It connects each gen to the ac electrical bus, regulates gen output, and protects system components against overvoltage, undervoltage, feeder fault, and underfrequency

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6
Q

NATOPS Chap 2

Electrical System

At what Nr will the GCUs disconnect the generators while on the ground and in the air?

A

On the ground, 94% Nr

In the air, 80% Nr

The GCUs will reconnect Gens to the AC buses at 97% Nr

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7
Q

NATOPS Chap 2

Electrical System

What is external power monitored for?

A

Over/under voltage, phase rotation, under/overfrequency

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8
Q

NATOPS Chap 2

Electrical System

What are the Three Little Pigs?

A

1) Backup Hyd pump (#1 AC Pri)

2) Mission Pwr (AC Secondary bus) [TR deice is also on
this bus]

3) MR Deice (AC Monitor Bus)

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9
Q

NATOPS Chap 2

Electrical System

When do the GEN cautions appear? (3 times)

A
  1. Respective gen is not supplying power to the Buses
  2. Respective Gen is selected off
  3. A failure of the Gen, GCU, Contactor control relay, or wiring fault has occured
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10
Q

NATOPS Chap 2

Electrical System

When does the APU GEN ON advisory appear

A

When the generator is supplying electrical power to a primary bus

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11
Q

NATOPS Chap 2

Electrical System

When does the APU GEN caution appear (2x)

A
  1. Failure of the APU-driven gen, GCU, contactor contol
    relay, or wiring fault
  2. APU gen selected on, APU started, but has not
    reached op limits
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12
Q

NATOPS Chap 2

Electrical System

What is the primary purpose of of the battery?

A

It provides 24VDC to start the APU and to power the dc essential bus and the battery bus.

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13
Q

NATOPS Chap 2

Electrical System

What is the normal battery life?

A

With an 80% charge, the battery will operate 11min during the day, and 9min at night

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14
Q

NATOPS Chap 2

Electrical System

What is the purpose of the batt analyzer/conditioner?

A

It monitors the battery for:

  1. ) Fault condition
  2. ) Battery charge
  3. ) Internal temperature
  4. ) Cell conditions
  5. ) and provides a battery-charging capability.
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15
Q

NATOPS Chap 2

Electrical System

What does the conditioner do if it detects a fault?

A

It will automatically disconnect the dc loads from the battery, or the battery from the charging circuit as necessary

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16
Q

NATOPS Chap 2

Electrical System

What busses do the 1/2 coverters power?

A
  1. # 1 DC pri, Dc essential, and Battery Bus

2. #2 DC pri

17
Q

NATOPS Chap 2

Electrical System

What do you lose when the battery reaches certain charge levels?

A

1) If the Battery is <30% you lose the capability of firing
the CAD

2) If the Battery is < 35%, it will shed the DC essential
bus

3) <40% charge, you receive BATT LOW Caution

18
Q

NATOPS Chap 2

Electrical System

What does the External power system include?

A

It includes a 4-amp circuit breaker that palces a 2-amp draw on teh power cable when connceted to the aircraft.

19
Q

NATOPS Chap 2

Electrical System

What does the two DC converters supply, and what are they powered by?

A

They supply 28VDC power to the DC electrical system. They are powered by the No. 1 and No. 2 AC Primary buses

20
Q

NATOPS Chap 2

Electrical System

What happens if you have a single/dual converter fail?

A

Single converter Fail- the other converter will pick up the
load of the buses powered by the failed converter
via automatic bus switching

Dual Converter Fail- the battery provides a source of
emergency electrical power to the Battery Utility
Bus, the Battery Bus, and the DC Essential bus

21
Q

NATOPS Chap 2

Electrical System

What happens if you have a Dual converter fail? Why do you not want to pull the CB like the checklist talks about?

A

In the event of a dual converter fail, you will lose both flight and mission displays. If you pull the circuit breaker, you can lose comms (this comes from experience while running electrical checks on FCFs)

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