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HSM-72 HAC > Electrical and Lights > Flashcards

Electrical and Lights Flashcards

1
Q

AC power generators/APU

DC power converters

Battery power

A

30/45 kVA (35 kVA for APU), 115-volt AC, 3 phase, 400 hz

28 volt dc

24 volt dc, 5.5 amp

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2
Q

GCU is/does what?

A

Generator control unit

  • Connects generator to AC bus system
  • regulates generator output

Protects against:

-overvoltage, undervoltage, feeder fault, underfrequency

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3
Q

When does the GCU remove the generators from the bus system?

A

Ground: below 94% NR

Air: below 80% NR, reconnects above 97% NR

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4
Q

External power is monitored for:

A
  • phase rotation
  • overvoltage
  • undervoltage
  • over frequency
  • under frequency

Includes a 4 amp circuit breaker with a 2 amp draw so that the ship can sense the load to provide power.

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5
Q

What are the 5 ac electrical buses?

A

1 and #2 AC Primary

AC essential
AC secondary
AC Monitor bus

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6
Q

The No. 1 generator normally power the :

A

1 AC primary

AC Essential
AC Secondary

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7
Q

The No. 2 generator normally powers the :

A 
#2 AC primary
AC Monitor bus
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8
Q

If both generators are on the APU is?

A

Not connected

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9
Q

If electrical power demand exceeds the capacity of the generator operating normally, the electrical bus loads are redistributed to available generators as follows:

aka Three little pigs

A
  1. Backup pump, will always be powered if required (#1 AC primary bus)
  2. Mission power is the next priority (AC Secondary bus). Bus also has tail rotor deice
  3. Main rotor deice has lowest priority (AC Monitor bus)
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10
Q

Ext pwr is automatically removed when ____________

A

APU or main generator is brought online

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11
Q

With ______ charge the battery will last _____ at night and _____ at during the day

A

80%
9min
11min

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12
Q

What are the D.C. Buses?

A

No. 1 and No. 2 DC primary bus
D.C. Essential bus
Battery utility bus
Battery bus

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13
Q

If only on battery power; the DC essential bus will get dropped at _______

A

35% charge

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14
Q

The battery utility bus receives power from the ________

A

Battery regardless of position.

Will connect to the dc essential and battery bus if in the ON position and battery is the only source of power.

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15
Q

With no other source of DC power, and battery below _____ the power may be insufficient to do what?

A

30%

Blow the fire extinguisher CADs

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16
Q

The batt low charge appears at ____

A

40% power

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17
Q

Battery fault caution means that the ______

A

Battery has an overtemperature or cell dissimilarity. Battery is disconnected from the charging circuit.

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18
Q

Search light can be moved ?

A

120* forward and 360* about its axis

19
Q

When you turn the search light off will it re-stow?

A

No. It will remain in current position

20
Q

The rescue light can be operated from the crew hover panel only when?

A

The cockpit switch is in OFF or FWD.

21
Q

What is the primary source of electrical power, and where can it be supplied from?

A 
Alternating Current (ac) power
Main generators, APU generator, or external power.
22
Q

Where is DC electrical power supplied from?

A

two converters that convert 115-vold ac power to 28-vold dc power

23
Q

When does the #1/#2 GEN caution appear?

A
  1. Respective generator is not supplying power to the buses
  2. Respective Generator is selected off
  3. A failure of the generator, GCU, contactor control relay, or a wiring fault has occurred.
24
Q

When does the #1/#2 GEN BRG caution appear?

A

When the generator main bearing is worn or has failed

25
Q

When does the APU GEN caution appear?

A
  1. Failure of the APU-driven generator, GCU, contactor control relay, or wiring fault
  2. APU generator selected ON, APU started, but has not reached operating limits.
26
Q

What are the two converters powered by?

A

The #1 and #2 AC primary buses

27
Q

The 24-volt dc battery is the primary source of power for _______ and the secondary source of power for the ____ and ____.

A

APU Starting

DC essential bus, Battery bus

28
Q

What does the battery analyzer/conditioner do?

A

It monitors the battery system for:

  • fault conditions
  • battery charge
  • internal temperature
  • cell conditions
  • provides a battery-charging capability.
29
Q

If the converters are operating and the BATT switch is ON, the charging circuit of the analyzer/conditioner receives power from what?

A

the No. 2 AC Primary bus and DC charging power from the No. 2 DC Primary bus.

30
Q

What does the #1 Converter power?

A

1 DC primary bus

DC essential Bus
Battery Bus

31
Q

What does the #2 Converter power?

A

2 DC Primary Bus

32
Q

What happens if a single converter fails?

If both converters fail?

A

The operating converter will pick up the load of the buses powered by the failed converter via automatic bus switching

The battery provides a source of emergency electrical power to the Battery Utility bus, the Battery bus (if the switch is on) and the DC Essential bus
Both Flight and Mission displays will be lost

33
Q

Can the Pilot override the Copilot when controlling the searchlight on the collective?

A

Yes

34
Q

In the event of total loss of AC power, what cockpit lights do you have?

A

Lower console secondary lights, Utility lights, and the glareshield lights

35
Q

Backup attitude indicator will operate for maximum of __ min after battery depletion

A

9 min

36
Q

With total loss of AC power, aircraft lighting retained will be limited to

A

Rotor head light
Utility Lights
Secondary lights
Cabin dome lights

37
Q

If battery depletion below 35%, __ lighting will be retained because they are powered by the __ bus

A

no internal lighting; dc essential bus

38
Q

With a dual converter DC failure, ___ will be available

A 
Secondary/backup inst lights
Master Caution
Warning tones
Lower console lights
Upper console lights
39
Q

With an ac and/or dc power failure, battery life may be no more than __ min (day) and __ min (night)

A

11, 9

40
Q

Stab auto programming is on the ___ bus

A

AC Essential

41
Q

Stab manual slewing is on the ___ bus

A

DC Essential & No 1 DC primary

Electric jackscrews

42
Q

Loss of electrical power will result in what with engine anti-ice?

A

Activation regardless of switch positions

43
Q

Stab travel is limited to __ if full down or __ if full up when a power failure occurs

A

35, 30

44
Q

Stab position indicator is on the __ bus

A

AC essential

HSM-72 HAC (47 decks)

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