Q300 Electrics Jh

Front 1

What runs off the Battery Bus

Back 1

1.Fire extinguishers(engines and apu)

2.Fuel and Hydraulic shut off valves

3. Refuel Defuel shut off valve

4. Dome lights

5. Boarding lights

6. PA emergency power

Front 2

If running off battery, How long can battery last.

Back 2

30min at 40amps

(20 amps = 60min)

(80amps = 15min)

Front 3

If switch on Main battery switch, which bus is powered?

Back 3

Essential bus

(And fixed AC (inverters) power avionics)

(as well as battery bus always powered)

Front 4

If switch on Aux switch, which bus will be powered?

Back 4

Essential bus

Front 5

Which buses have to be powered to have all of the flight deck powered up?

Back 5

Essential and right main bus?

Front 6

What is max load of the APU DC generator?

Back 6

300amps

Front 7

When is the only time all bus ties are closed?

Back 7

On the ground.

(If GPU plugged in or APU generator powering the aircraft)

Front 8

How many temperature sensors are installed on each battery?

Back 8

2 (one to sensor gauge and one to warnings)

Front 9

What is Fixed AC primarily used for? And how many inverters required to power the Fixed AC system?

Back 9

Avionics

1

Front 10

How many batteries does the aircraft have?

Back 10

2

Front 11

Which buses are powered with the Battery Master and Main Batt ON (plus Main Bus Tie ON)

Back 11

Essential (& Fixed AC) & Right and Left Main buses

Front 12

How do we get battery power to the left main buses?

Back 12

Main bus tie ON

(On the ground its manual, in air the mouse takes over)

Front 13

What voltage should we see on the DC monitor with external DC power on?

Back 13

28V

(don't want to see less voltage than the batterys 24V as it will be draining)

Front 14

Which buses will be powered with DC external power supplying the aircraft?

Back 14

All

(All ties closed automatically when GPU or APU Generator is on)

Front 15

DC generator limits

Back 15

flight 1.0

ground 0.7 (air cooled, less air flow on ground)

flight 1.0

Front 16

TRU limits

Back 16

1.0 flight

1.0 ground (fan cooled, maintains temp)

Front 17

AC generator limits

Back 17

Flight 1.0

Ground below 10°C 1.0

above 10°C 0.33 (oil cooled, oil is already warm)

Front 18

Will external DC power charge the batteries

Back 18

Yes if External voltage is higher than Internal voltage

And Aux & Main switches ON

Front 19

Will APU charge batteries

Back 19

Yes if Aux & Main Batt switches ON

Front 20

What is minimum battery voltage required for engine start

Back 20

22V

Front 21

At what voltage does the over-voltage protection lock out DC external power

Back 21

31.5V

Front 22

Can external power and the entire DC gen be on line at the same time

Back 22

No. External power turns off the DC generators

Front 23

If a DC generator fails will the opposite main bus be powered

Back 23

Yes (horizontal ties close first)

Front 24

How are DC generators cooled

Back 24

Air cooling

(hence 200amps on ground due less airflow but 300 amps in flight)

(APU has a fan so can maintain 300amps on ground)

Front 25

If the main buses are powered are the essential buses automatically powered

Back 25

Yes

Front 26

Will the AC generators be online with the props in feather

Back 26

No

Front 27

The AC generators provide power to which buses

Back 27

Left and Right Variable AC buses

(Heaters and pumps)

Front 28

If an AC generator failed in flight would the opposite AC bus be powered

Back 28

Yes (mouses wife)

Front 29

Which buses are powered directly by the TRU's

Back 29

Secondary buses

Front 30

What is the input and output power of the TRU

Back 30

115V Variable AC to 28V DC

Front 31

How can a TRU be turned off

Back 31

CB

Front 32

If one TRU fails will both secondary buses be powered?

Back 32

Yes, mouse pulls bottom horizontal tie (secondary bus tie)

Front 33

If both TRU's fail will there secondary buses be powered

Back 33

Yes, mouse pulls both vertical bus ties

Front 34

What does DC logic control

Back 34

Bus Ties

Front 35

What is the priority for DC logic

Back 35

Horizontal ties before vertical,

Vertical can only be together,

Horiz and Very can't be together.

Only time all bus ties are closed is when GPU or APU are operating the aircraft.

Front 36

"DC BUS" caution indicates what?

Back 36

BBPU detects current greater than 400amps and opens all bus ties (to protect equipment).

After 7 seconds it disconnects affected Generator and Battery.

Front 37

What is the primary function of the DC bus fault reset switch

Back 37

It resets BBPU and returns to bus tie logic (Restores normal operation of fault has been rectified).

(BBPU remains ready in back ground)

Front 38

Loss of both DC generators procedure requires switching off all battery switches. What is supplying power to the DC system? What will happen if one of these fails?

Back 38

TRU's.

Lose cockpit electricity only (mouse releases vert ties and pulls the secondary tie)

Front 39

Which bus powers the arm switch for emergency lighting

Back 39

Right Secondary bus

Front 40

What does Fixed AC power

Back 40

Avionics and Flight Instruments

(Inverters powered off Essential Bus, as long as Essential Bus has power you will have Avionics)

(As long as have 1 inverter you have power to all Avionics)

Front 41

What does Variable AC power?

Back 41

Heaters and pumps

(non critical equipment. It's not accurate enough for avionics)

Front 42

When does bus tie logic work?

Back 42

When there is Generator power.

With Battery power we need to close main bus tie manually.

Front 43

What does Secondary bus power?

Back 43

Cabin (lights)

Front 44

What is the ground service power switch?

Back 44

Used to power secondary bus so cabin lights can stay on for cleaners at night

(Located on left circuit breaker panel)