SAAB 340B Electrical

Question 1

What are the power sources for the DC electrical system?

Answer 1

Batteries, External power, Generators

Question 2

How many Ni-Cad batteries are on the aircraft?

Answer 2

Seven, 2 main, 5 emergency lighting under cabin floor

Question 3

What are the type of main batteries?

Answer 3

24V DC 43 Amp hour Ni-Cad

Question 4

Where are the main batteries located?

Answer 4

In the respective wing-fuselage fairing

Question 5

How are the batteries vented for cooling?

Answer 5

By ram air in flight, fans on ground

Question 6

What are the four separate parts of the electrical system?

Answer 6

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

Question 7

What are the four separate parts of the electrical system?

Answer 7

AC, Wild Freq 115V AC

Question 8

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

Answer 8

Two 115/26 V AC invertors powered by the

Question 9

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

Answer 9

DC system

Question 10

What is the power source for the emergency power system?

Answer 10

28V DC system or emergency battery

Question 11

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

Answer 11

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

Question 12

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

Answer 12

Wild Freq 115VAC

Question 13

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

Answer 13

Ice protection

Question 14

What makes up the 28V DC system?

Answer 14

One generator, One Battery each side

Question 15

Where is the wild frequency generator located?

Answer 15

In the prop gear box

Question 16

What cools the DC generator?

Answer 16

Ram air inflight, fans on ground

Question 17

An illuminated GEN OV TEMP light?

Answer 17

Generator is overheated (150 C)

Question 18

L/R MAIN BUS light illumination?

Answer 18

Bus is unpowered

Question 19

NO BAT START illuminated?

Answer 19

One or Both Batteries reached 57 C

Question 20

EMER PWR light illuminated?

Answer 20

Emergency bus not powered

Question 21

EMER PWR light illuminated?

Answer 21

Battery has decreased below 24V

Question 22

L/R GEN light illuminated?

Answer 22

Respective Generator relay is open

Question 23

L/R MAIN BUS light illumination?

Answer 23

Respective Bus is unpowered

Question 24

Starter Generators are rated at what voltage?

Answer 24

28 volts

Question 25

When will the external power magnetic switch release automatically?

Answer 25

GPU voltage below 10 or exceeds 31 volts

Question 26

When will the external power magnetic switch release automatically?

Answer 26

Engine start GPU <7 volts

Question 27

What is the blue EXT PWR AVAIL light?

Answer 27

GPU connected, at least 4 volts

Question 28

How many alternators on each engine?

Answer 28

One per engine, electric to engine only

Question 29

How many generators on each engine?

Answer 29

Two, one starter gen and one AC generator

Question 30

What is the starter/generator amp limit?

Answer 30

600 amps for 5 minutes then 400 amps

Question 31

The starter/generators are rated at?

Answer 31

400 amps

Question 32

GPU powering aircraft what lights will be illuminated?

Answer 32

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

Question 33

Battery power only, what lights?

Answer 33

L/R GEN, L/R MAIN BUS

Question 34

What type of battery is the Emergency?

Answer 34

24 V DC, 5 amp hour lead acid

Question 35

What is the purpose of the series/parallel relay?

Answer 35

Battery start first engine, batteries are connected in series

Question 36

Are the batteries used for cross gen start?

Answer 36

Yes, they assist the gen for faster starts

Question 37

When is the GEN relay light expected on?

Answer 37

GEN OFF

Question 38

When is the GEN relay light expected on?

Answer 38

EXT PWR

Question 39

When is the GEN relay light expected on?

Answer 39

Fire Handle pulled

Question 40

When is the GEN relay light expected on?

Answer 40

Ng less than 55% - Gen Failure

Question 41

What min Ng to connect GEN to bus?

Answer 41

55%

Question 42

L/R ESS BUS LIGHT?

Answer 42

Associated bus unpowered

Question 43

L/R BAT HOT?

Answer 43

Associated battery temp 71 C

Question 44

What happens at 71 C battery temp?

Answer 44

BAT relay opens, disconnects from GEN bus

Question 45

The left battery is connected to which bus?

Answer 45

Start bus

Question 46

What bus is the right battery connected to?

Answer 46

Right GEN bus

Question 47

What powers the EMER Bus?

Answer 47

Left BATT bus

Question 48

When does the Emergency battery power the EMER BUS?

Answer 48

L Battery drops below 24 Volts

Question 49

What powers the Emergency Avionics bus?

Answer 49

Emergency bus

Question 50

AC GEN light?

Answer 50

Offline, not supplying power

Question 51

If prop drops below 996 PRPM?

Answer 51

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

Question 52

INVERTOR light?

Answer 52

Switch is OFF or Invertor has failed

Question 53

Failure of 26V output of the inverter?

Answer 53

NO CWP warnings

Question 54

Failure of 26V output of the inverter?

Answer 54

RMI and VOR CDI failure

Question 55

Emergency Lights 26V AC?

Answer 55

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

Question 56

Emergency Avionics Bus

Answer 56

Standby horizon - Comm 1

Question 57

Battery temp 57 C?

Answer 57

No Battery start

Question 58

Battery temp 61 C?

Answer 58

No cross generator start

Question 59

Battery temp 64 C

Answer 59

No takeoff

Question 60

Battery temp 71 C

Answer 60

Battery Hot

Question 61

Minimum battery temp for takeoff?

Answer 61

-20 C

Question 62

What is wild frequency?

Answer 62

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

Question 63

Emergency BUS

Answer 63

Audio System (back up)

Question 64

Emergency BUS

Answer 64

Bustie

Question 65

Emergency BUS

Answer 65

Engine Fire Detection

Question 66

Emergency BUS

Answer 66

Tailpipe Hot

Question 67

Emergency BUS

Answer 67

WEU back-up Power

Question 68

Emergency BUS

Answer 68

Emergency Bus volt indicator

Question 69

Emergency BUS

Answer 69

Emergency Avionics bus

Question 70

Emergency BUS

Answer 70

down step down voltage for lights

Question 71

L HOT Bus

Answer 71

Fire Handle

Question 72

L HOT Bus

Answer 72

Cargo Extinguisher

Question 73

L HOT Bus

Answer 73

Dome, Interior, Cargo lights

Question 74

L HOT Bus

Answer 74

AHARS 1 B/U power

Question 75

L HOT Bus

Answer 75

Voltage Indicator

Question 76

L HOT Bus

Answer 76

Extinguisher

Question 77

R HOT Bus

Answer 77

Fire Handle

Question 78

R HOT Bus

Answer 78

Cargo Extinguisher

Question 79

R HOT Bus

Answer 79

Refuel/Defuel

Question 80

R HOT Bus

Answer 80

AHARS 2 B/U power

Question 81

R HOT Bus

Answer 81

Voltage Indicator

Question 82

R HOT Bus

Answer 82

Extinguisher

Question 83

115V AC

Answer 83

Flight Data recorder

Question 84

115V AC

Answer 84

Radar stabilization

Question 85

115V AC

Answer 85

Overhead lights

Question 86

115V AC

Answer 86

GPWS

Question 87

Generator Control Unit

Answer 87

Reverse current

Question 88

Generator Control Unit

Answer 88

Overvoltage

Question 89

Generator Control Unit

Answer 89

Overcurrent

Question 90

Generator Control Unit

Answer 90

Field Excitation

Question 91

Generator Control Unit

Answer 91

Start to generator logic

Question 92

26V AC

Answer 92

CDI

Question 93

26V AC

Answer 93

AHARS pointers

Question 94

26V AC

Answer 94

RMI pointers

Question 95

Utility bus

Answer 95

No Tea Jugs

Question 96

Utility bus

Answer 96

No Pee Lav motor

Question 97

Utility bus

Answer 97

No See Lights