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HAC > Electrical System - NATOPS CH. 2.6 > Flashcards

Electrical System - NATOPS CH. 2.6 Flashcards

1
Q

What are the sources of AC power?

A

Generators, APU, External power

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2
Q

How are the main generators driven?

A

Transmission

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3
Q

What battery do we have?

A

24V Nickel Cadmium battery

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4
Q

Two primary uses of the battery

A

Start the APU

Power the battery utility bus

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5
Q

Description of the Main Generators

A

Oil cooled, 30/45kVa, 115 Vac, 3 phase, 400 Hz power

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6
Q

Description of the APU Generator

A

Air cooled, 35kVA, 115 Vac, 3 phase, 400 Hz

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7
Q

Functions of the GCU

A

Connects generators to AC bus

Regulated generator output

Protects against over voltage, undervoltage, feeder faults, under frequency

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8
Q

With weight on wheels, at what percent Nr does the GCU remove the main generators from the ac power system?

A

94% Nr

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9
Q

In flight, under frequency protection is disabled and generators remain online until ______ Nr.

A

80% Nr

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10
Q

A minimum of _____ Nr is required for the GCU to reconnect the generators to the ac power system.

A

97% Nr

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11
Q

What is external power monitored for?

A

Phase rotation, over voltage, under voltage, over frequency, under frequency.

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12
Q

External power system includes a ___ amp circuit breaker that places a ___ amp draw.

A

4 amp, 2 amp

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13
Q

What are the five AC buses?

A

No. 1 AC Primary
No. 2 AC Primary
AC Secondary
AC Essential
AC Monitor

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14
Q

Three Pigs

A
  1. Backup Hyd Pump on No. 1 AC Primary
  2. Mission computer and TR De-Ice on AC Secondary
  3. Main Rotor De-Ice on AC Monitor
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15
Q

What does the RESET switch do on the generators?

A

Resets the GCU if it was disabled or disconnected

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16
Q

External power will automatically be ____________ when either a main or APU generator is brought online.

A

Disconnected

17
Q

With only one generator and backup pump off, what is the only bus that gets dropped?

A

AC Monitor

18
Q

With one generator and backup pump on, what are the two buses that get dropped?

A

AC Secondary, AC Monitor

19
Q

What voltage is DC power?

A

28 Vdc

20
Q

With an _____ charge, normal battery life is _____ minutes during the day, and _____ minutes at night.

A

80%, 11 minutes, 9 minutes

21
Q

What are the functions of the battery analyzer/conditioner?

A

Monitor for fault conditions, battery charge, internal temperature, cell conditions, and provides battery charging capability.

22
Q

Where does the charging circuit of the battery analyzer/conditioner get its power?

A

No. 2 AC Primary

23
Q

Where does the battery analyzer/conditioner get its dc charging power from?

A

No. 2 DC Primary

24
Q

What are the five buses in the DC power system?

A

No. 1 DC Primary
No. 2 DC Primary
DC Essential
Battery Bus
Battery Utility Bus

25
Q

What powers the No. 1 DC Primary Bus, DC Essential, and Battery Bus?

A

No. 1 Converter

26
Q

What powers the No. 2 DC Primary Bus?

A

No. 2 Converter

27
Q

What powers the battery utility bus?

A

Battery

28
Q

If both converters fail, what does the battery power?

A

Battery Utility Bus, Battery Bus, DC Essential bus

29
Q

With no other source of DC power and the battery below a _____ charge, battery power may not be sufficient to activate the fire extinguished CADs.

A

30%

30
Q

When do you get BATT CHARGE LOW?

A

Less than 40%

31
Q

What bus do you lose with battery only, less than 35% charge?

A

DC Essential

32
Q

______ _______ _________ will be inoperative when the ac essential bus is lost and _______ ______ capability will be lost when the dc essential bus is lost.

A

Stab auto programming

Manual slew

33
Q

Warning: Without electrical power to the dc primary buses, the engine and inlet anti-ice valves are automatically opened. With an improperly operating engine inlet anti-ice system, a loss of up to _____ power available per engine is possible.

A

49%

HAC (24 decks)

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