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SAAB 340B > SAAB 340B Electrical > Flashcards

SAAB 340B Electrical Flashcards

1
Q

What are the power sources for the DC electrical system?

A

Batteries, External power, Generators

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2
Q

How many Ni-Cad batteries are on the aircraft?

A

Seven, 2 main, 5 emergency lighting under cabin floor

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3
Q

What are the type of main batteries?

A

24V DC 43 Amp hour Ni-Cad

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4
Q

Where are the main batteries located?

A

In the respective wing-fuselage fairing

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5
Q

How are the batteries vented for cooling?

A

By ram air in flight, fans on ground

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6
Q

What are the four separate parts of the electrical system?

A

28V DC, Emergency DC power, 115/26V

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7
Q

What are the four separate parts of the electrical system?

A

AC, Wild Freq 115V AC

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8
Q

What is the power source for the 115/26 VAC system?

A

Two 115/26 V AC invertors powered by the

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9
Q

What is the power source for the 115/26 VAC system?

A

DC system

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10
Q

What is the power source for the emergency power system?

A

28V DC system or emergency battery

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11
Q

What is the power source for the wild frequency 115 V AC system?

A

28VDC, Emergency DC power, 115/26VAC,

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12
Q

What is the power source for the wild frequency 115 V AC system?

A

Wild Freq 115VAC

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13
Q

What is the wild frequency 115V AC system used for?

A

Ice protection

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14
Q

What makes up the 28V DC system?

A

One generator, One Battery each side

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15
Q

Where is the wild frequency generator located?

A

In the prop gear box

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16
Q

What cools the DC generator?

A

Ram air inflight, fans on ground

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17
Q

An illuminated GEN OV TEMP light?

A

Generator is overheated (150 C)

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18
Q

L/R MAIN BUS light illumination?

A

Bus is unpowered

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19
Q

NO BAT START illuminated?

A

One or Both Batteries reached 57 C

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20
Q

EMER PWR light illuminated?

A

Emergency bus not powered

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21
Q

EMER PWR light illuminated?

A

Battery has decreased below 24V

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22
Q

L/R GEN light illuminated?

A

Respective Generator relay is open

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23
Q

L/R MAIN BUS light illumination?

A

Respective Bus is unpowered

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24
Q

Starter Generators are rated at what voltage?

A

28 volts

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25
Q

When will the external power magnetic switch release automatically?

A

GPU voltage below 10 or exceeds 31 volts

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26
Q

When will the external power magnetic switch release automatically?

A

Engine start GPU <7 volts

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27
Q

What is the blue EXT PWR AVAIL light?

A

GPU connected, at least 4 volts

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28
Q

How many alternators on each engine?

A

One per engine, electric to engine only

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29
Q

How many generators on each engine?

A

Two, one starter gen and one AC generator

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30
Q

What is the starter/generator amp limit?

A

600 amps for 5 minutes then 400 amps

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31
Q

The starter/generators are rated at?

A

400 amps

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32
Q

GPU powering aircraft what lights will be illuminated?

A

White EXT PWR, L/R GEN, L/R BAT

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33
Q

Battery power only, what lights?

A

L/R GEN, L/R MAIN BUS

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34
Q

What type of battery is the Emergency?

A

24 V DC, 5 amp hour lead acid

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35
Q

What is the purpose of the series/parallel relay?

A

Battery start first engine, batteries are connected in series

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36
Q

Are the batteries used for cross gen start?

A

Yes, they assist the gen for faster starts

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37
Q

When is the GEN relay light expected on?

A

GEN OFF

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38
Q

When is the GEN relay light expected on?

A

EXT PWR

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39
Q

When is the GEN relay light expected on?

A

Fire Handle pulled

40
Q

When is the GEN relay light expected on?

A

Ng less than 55% - Gen Failure

41
Q

What min Ng to connect GEN to bus?

A

55%

42
Q

L/R ESS BUS LIGHT?

A

Associated bus unpowered

43
Q

L/R BAT HOT?

A

Associated battery temp 71 C

44
Q

What happens at 71 C battery temp?

A

BAT relay opens, disconnects from GEN bus

45
Q

The left battery is connected to which bus?

A

Start bus

46
Q

What bus is the right battery connected to?

A

Right GEN bus

47
Q

What powers the EMER Bus?

A

Left BATT bus

48
Q

When does the Emergency battery power the EMER BUS?

A

L Battery drops below 24 Volts

49
Q

What powers the Emergency Avionics bus?

A

Emergency bus

50
Q

AC GEN light?

A

Offline, not supplying power

51
Q

If prop drops below 996 PRPM?

A

AC GEN drops off, auto rest when PRPM is above again

52
Q

INVERTOR light?

A

Switch is OFF or Invertor has failed

53
Q

Failure of 26V output of the inverter?

A

NO CWP warnings

54
Q

Failure of 26V output of the inverter?

A

RMI and VOR CDI failure

55
Q

Emergency Lights 26V AC?

A

Compass, OBS, Pressurization - Standby Instruments: ADI, Airspeed, Alt

56
Q

Emergency Avionics Bus

A

Standby horizon - Comm 1

57
Q

Battery temp 57 C?

A

No Battery start

58
Q

Battery temp 61 C?

A

No cross generator start

59
Q

Battery temp 64 C

A

No takeoff

60
Q

Battery temp 71 C

A

Battery Hot

61
Q

Minimum battery temp for takeoff?

A

-20 C

62
Q

What is wild frequency?

A

Frequency varies with prop RPM (460Hz to 640 Hz)

63
Q

Emergency BUS

A

Audio System (back up)

64
Q

Emergency BUS

A

Bustie

65
Q

Emergency BUS

A

Engine Fire Detection

66
Q

Emergency BUS

A

Tailpipe Hot

67
Q

Emergency BUS

A

WEU back-up Power

68
Q

Emergency BUS

A

Emergency Bus volt indicator

69
Q

Emergency BUS

A

Emergency Avionics bus

70
Q

Emergency BUS

A

down step down voltage for lights

71
Q

L HOT Bus

A

Fire Handle

72
Q

L HOT Bus

A

Cargo Extinguisher

73
Q

L HOT Bus

A

Dome, Interior, Cargo lights

74
Q

L HOT Bus

A

AHARS 1 B/U power

75
Q

L HOT Bus

A

Voltage Indicator

76
Q

L HOT Bus

A

Extinguisher

77
Q

R HOT Bus

A

Fire Handle

78
Q

R HOT Bus

A

Cargo Extinguisher

79
Q

R HOT Bus

A

Refuel/Defuel

80
Q

R HOT Bus

A

AHARS 2 B/U power

81
Q

R HOT Bus

A

Voltage Indicator

82
Q

R HOT Bus

A

Extinguisher

83
Q

115V AC

A

Flight Data recorder

84
Q

115V AC

A

Radar stabilization

85
Q

115V AC

A

Overhead lights

86
Q

115V AC

A

GPWS

87
Q

Generator Control Unit

A

Reverse current

88
Q

Generator Control Unit

A

Overvoltage

89
Q

Generator Control Unit

A

Overcurrent

90
Q

Generator Control Unit

A

Field Excitation

91
Q

Generator Control Unit

A

Start to generator logic

92
Q

26V AC

A

CDI

93
Q

26V AC

A

AHARS pointers

94
Q

26V AC

A

RMI pointers

95
Q

Utility bus

A

No Tea Jugs

96
Q

Utility bus

A

No Pee Lav motor

97
Q

Utility bus

A

No See Lights

SAAB 340B (8 decks)

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