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Southwest > Electrical > Flashcards

Electrical Flashcards

1
Q

When does the DRIVE light illuminate on the IDG panel?

A

-IDG Failure
-engine shutdown
-IDG Automatic disconnect
-IDG disconnected with the DISCONNECT switch

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2
Q

How much power is produced by the engine generators?

A

115v, 400 Hz

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3
Q

What does it mean when the TRANSFER BUS OFF light is illuminated?

A

Indicates that the related transfer bus is not powered.

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4
Q

What is a TRU?

A

Transformer rectifier unit

It converts AC power to DC power

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5
Q

Under what conditions will the TR UNIT light illuminate?

A

On the ground for any TRU failure
Inflight, TR1 has failed or both TR2 & TR3 have failed

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6
Q

The Cross Bus Tie Relay opens automatically:

A
  1. At glideslope capture with the flight director or auto pilot selected to ILS approach
  2. BUS TRANSFER switch selected to off
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7
Q

What powers the AC STANDBY BUS?

A

Main power source is AC TRANSFER BUS 1
The secondary source is from the MAIN BATTERY through the STATIC INVERTER.

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8
Q

Where does the DC STANDBY BUS receive power from?

A

TR1, TR2, & TR3

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9
Q

What happens if power is not available from the TR’s in regards to the DC STANDBY BUS?

A

The DC STANDBY BUS can be powered directly by the battery

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10
Q

What type of battery is there?

A

A single 24v DC nickel-cadmium battery

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11
Q

What is the normal battery voltage range

A

22-30 volts

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12
Q

The battery charger has two modes of operation:

A

A charge mode (when battery voltage drops below a predetermined limit
A transformer rectifier mode (completion of the charge cycle, it reverts to constant voltage TR mode. To keep the battery at full capacity

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13
Q

The battery charger charges loads connected to which buses?

A

Hot battery Bus and Switched Hot Battery Bus

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14
Q

If power is lost to AC TRANSFER BUS 1 or the source of power to DC BUS 1 what can power both the AC and DC STANDBY BUSES?

A

The battery charger

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15
Q

How long can a fully charged battery supply standby power for?

A

A minimum of 30 minutes

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16
Q

Which busses comprise the standby power system

A

HOT BATTERY BUS
SWITCHED HOT BATTERY BUS
BATTERY BUS
DC STANDBY BUS
AC STANDBY BUS

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17
Q

All generators inop, equipment available: Airplane general

A

Standby compass light
White dome lights
Emergency instrument flood lights
Flight crew oxygen
Pax oxygen

18
Q

All generators inop, equipment available: Air systems

A

Air conditioning pack valves
BLEED TRIP OFF LIGHTS
Manual pressurization control
Altitude warning horn
PACK TRIP OFF lights

19
Q

All generators inop, equipment available: Anti-ice

A

Captains pitot probe heat

20
Q

All generators inop, equipment available: Communications

A

Flight interphone system
Service interphone system
Pax address system
VHF 1

21
Q

All generators inop, equipment available: ELECTRICAL

A

STANDBY POWER OFF light

22
Q

When does the STANDBY PWR OFF light illuminate?

A

Illuminates if the AC STANDBY BUS, DC STANDBY BUS, or BATTERY BUS is not powered.

23
Q

What does the blue GRD POWER AVAILABLE light indicate?

A

External power meets aircraft quality standards

24
Q

What does the blue APU GEN OFF BUS light indicate?

A

The APU is running and not powering any AC Transfer Bus.

25
Q

Which of the following causes the DRIVE light to illuminate?

A

IDG oil low oil pressure or under frequency condition

26
Q

What is the purpose of the Bus Tie Breakers?

A

Auto control AC power distribution

27
Q

What is the purpose of selecting the BUS TRANSFER switch OFF?

A
  1. To inhibit Bus Tie Breaker auto switching
  2. To open the cross bus tie relay
28
Q

An illuminated STANDBY PWR OFF light indicates a power loss to which bus?

A

DC STANDBY BUS
BATTERY BUS
AC STANDBY BUS

29
Q

The guarded STANDBY POWER switch powers what when in Auto ?

A

In flight or ground, and AC transfer busses powered:

  • AC standby bus is powered by AC transfer bus 1
  • DC standby bus is powered by TR1,2,3

In flight or ground, loss of all AC power:

  • AC Standby bus is powered by Battery through static inverter
  • DC standby bus is powered by battery
  • Battery bus is powered by battery
30
Q

The guarded STANDBY POWER switch does what when in the Off position?

A
  • STANDBY POWER OFF light illuminates
  • AC standby bus, static inverter, and DC standby bus are not powered
31
Q

The guarded STANDBY POWER switch powers what when in The BAT position?

A
  • powers AC standby bus through static inverter
  • powers dc stand by bus and battery bus directly from the battery
32
Q

Generator drive and standby power panel: the generator drive “DRIVE” lights illuminate for what conditions?

A

DRIVE light is caused by a low pressure condition.

The light illuminated when:
- high oil temp (Auto disconnect)
- IDG failure
- Engine shutdown
- IDG disconnected through generator drive DISCONNECT switch

33
Q

Generator drive and standby power panel: when will the STANDBY PWR OFF light illuminate?

A

One or more of the following buses are unpowered:

  • AC STANDBY BUS
  • DC STANDBY BUS
  • BATTERY BUS
34
Q

Generator drive and standby power panel: what do the generator drive DISCONNECT switches do?

A
  • Manual disconnect if the associated IDG drive
  • Disconnects IDG if electrical power is available and engine start lever in idle
35
Q

AC/DC Metering Panel: what does the BAT DISCHARGE light when illuminated mean?

A

BAT switch is on and excessive battery discharge is detected.

36
Q

AC/DC Metering Panel: what does the TR UNIT light illuminated mean?

A

On ground:
- Any TR failed

In flight:
- either TR1 failed or both TR 2&3 failed

37
Q

AC/DC Metering Panel: what does the electrical ELEC light illuminated mean?

A

Only illuminates on the ground:

  • A fault exists in the DC Standby power system or standby power system.
38
Q

AC/DC Metering Panel: what does the guarded BAT switch do? How many positions does it have?

A

Two positions ( Off and On)

ON- turns the battery on, provides power to the :
- Hot battery bus
- Switched hot battery bus
- Battery bus
- AC/DC standby bus
- Static inverter

When in off position:
- prevents automatic switching of standby bus to battery power when normal el creo also power is lost
- Only hot bat bus will be powered

39
Q

AC/DC Metering Panel: what does the GALLEY or CAB/UTIL switch do in its two positions?

A

When in on position:
- Supplies power to Galley 115v bus
- Broadband satellite system
- cabin recirc fans
- Logo lights

40
Q

AC/DC Metering Panel: what does the IFE/PASS SEAT switch do?

A

When on supplies power to the broadband satellite system

When off removes electrical power from broadband satellite system

41
Q

AC/DC Metering Panel: what checked limitations are there?

A

-On the ground limit one generator operation to a maximum 215amps

-Don’t remove AC power from aircraft for at least 30 seconds after IRS shutdown

  • in flight reset of circuit should only be accomplished when directed QRH. Allow approx 2 mins before reset

Southwest (19 decks)

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