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Dash 8 Q400 > Electrical > Flashcards

Electrical Flashcards

1
Q

Does External power have priority over all other generators

A

Yes

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2
Q

Someone must be present on A/C with APU running

A

Company limitation (Double check required)

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3
Q

A/C has how many batteries & rating?

A

1 x 40 amp hr 28VDC Main Battery
1 x 40 amp hr 28VDC AUX Battery
1 x 40 amp hr 28VDC STBY Battery (when equipped with APU)
They provide 1 hr of backup power

Emergency batteries

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4
Q

battery temp limits

A

50-65 deg is amber
>65 is red

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5
Q

What drives AC generators?

A

Propellor Reduction gearboxes on respective engine

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6
Q

When is AC power available

A

Condition levers between min and max range

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7
Q

What are the Battery Start Considerations?

A

With AC external power, initial start will be on batteries only

Starter Cranking limits

(Charging rate decreases after 3 mins for serviceable batteries)

(Batt temps and charging rates are displayed on MFD and must be monitored while charging)

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8
Q

Does the APU DC Starter Generator power all DC buses when connected?

A

Yes

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9
Q

A Generator load display indication of +1.05 indicates that

A

The Generator load is 5% above rated load

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10
Q

What component protects the batteries and generators from faults in the main feeder busses?

A

EPCU

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11
Q

What is the maximum TRU LOAD limitation in flight or on the ground?

A

1.0

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12
Q

If the DC GEN#1 caution light illuminates what other aural alert will occur?

A

One chime from the warning tone generator will sound

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13
Q

Max Battery load meter reading permitted for take off is?

A

0.1

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14
Q

If both DC Generators fail in flight?

A

The EPCU will automatically close the main to secondary bus ties powering all busses through the TRU’s

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15
Q

The selection of the BATTERY MASTER switch, with no other switches selected connects the batteries to the?

A

L & R Essential Busses

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16
Q

The function of the TRU’s is to?

A

Convert variable AC into DC

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17
Q

The operation of the MAIN BUS TIE switch to the TIE position may be inhibited by?

A

The Electrical Power Control Unit

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18
Q

The selection of the MAIN BATT or AUX BATT switch without the BATTERY MASTER on will?

A

Connect the Main & Aux Batteries to the Left Battery Bus or the Standby Battery tot he Battery Bus

19
Q

The MAIN BUS TIE will always close when?

A

The EPCU signals it to close

20
Q

If both TRU’s fail in flight?

A

The EPCU will automatically close the MAIN to SECONDARY BUS TIES

21
Q

What is the rated load of the engine driven generators

A

400 Amp

22
Q

What buses are powered with AC external power

A

All AC and DC buses

23
Q

What is the maximim output rating of the TRU’s

A

28VDC 300 Amp (26 - 29 V range)

24
Q

When does auto load shedding of the galley buses occur?

A

A AC Generator fails

25
Q

When does the emergency mode of operation occur

A

Failure of both DC Gen’s and one TRU in the air

Will go into battery power mode

26
Q

What will the EPCU do when it detects a main bus fault?

A

Prevents main bus tie and main to secondary bus ties from closing and isolating the affected bus. Also after 5 seconds of persistent fault, sends a TRIP signal to the GCU to isolate the generator and batteries

27
Q

What will cause the EPCU to react to a main bus fault

A

Detection and protection of short circuits

28
Q

What bus does the Main battery connect to when the battery master is switched on?

A

Right Essential Bus

29
Q

What bus does the Auxilary battery connect to when the battery master is switched on?

A

Left essential bus

30
Q

What bus does the Standby battery connect to when the battery master is switched on?

A

Right essential bus

31
Q

What bus does the Main battery connect to when the Main Batt Switch is switched on?

A

Right Main Bus

32
Q

What bus does the Aux battery connect to when the Aux Batt Switch is switched on?

A

Left Main Bus

33
Q

What bus does the Standby battery connect to when the STBY Batt Switch is switched on?

A

Left Main Bus

34
Q

What does the Main Bus Tie Switch actually do? What happens if there is a fault?

A

Manually ties left and right main buses.

EPCU inhibits the connection if there is a fault.

35
Q

What does the Bus Fault Reset Switch do?

A

Re-initialises the EPCU after a bus isolation or fault to enable subsequent bus fault monitoring.

36
Q

Can battery power be applied to the Secondary Buses? Why?

A

No it cant, It comes from the TRU’s or through the L & R Main Buses

37
Q

What does the EPCU do in emergency mode?

A

The EPCU automatically disconnects the batteries from the main buses. There will be no power on the buses and remaining systems use battery power.

38
Q

In Emergency mode if you attempt an engine start, what does the EPCU do?

A

Automatically connects the batteries to the main buses for the duration of the start attempt even if the respective switches are set to off.

39
Q

Lost services on Left Main DC Bus?

A

Autopilot and Yaw Damper
Auto Cabin Pressurisation
Stick Pusher
ALT Downlock Indication
L ECS Auto
Rud Sys Isolate
Overhead Glareshield and Pilot Lights
L Flare, L Approach and taxi lights
FPD1
ESID CP, Plt EFIS CP
FMS1, DME1, ADF1
EGPWS, TCAS, ATC1
Flt Attendant Handset
Weather Radar

40
Q

Lost services on Right Main DC Bus?

A

Autopilot and Yaw Damper
Stick Pusher
Anti-skid
R ECS Auto
Pilot Window Heat
Deice boot lights
Cntr Console, Co-pilot lights
R Flare, R Approach and Anti-collision lights
Cabin Lights
PFD2, MFD2, ADU2
TCAS, ATC2
VHF2
FMS2, DME2, VOR2
Clock 2

41
Q

Lost services on Left AC BUS?

A

Stick Pusher
L Aux fuel pump
L Prop De-icing
L Alpha Vane Heater
L TRU
L Ice Detection Sensor
Pilot windshield Heat
L Engine Intake Heater
L Pitot static heater

42
Q

Lost services on Right AC BUS?

A

Stick Pusher
R AUX fuel pump
R prop de-icing
R Alpha Vane Heater
R TRU
R Ice detection sensor
Standby Hyd Pump
Co-pilot windshield Heat
R Engine Intake Heater
R Pitot Static Heater

43
Q

What two sources power the FADEC?
Primary & Secondary

A

Primary is the respective PMA located in the accessory drive section

Secondary is the essential power buses

44
Q

What systems are powered by the HOT BATTERY BUS?

A

Clocks 1 & 2
Battery Master switch
Battery power for refuelling
Fire bottles discharge squibs
Fuel and Hydraulic shutoff valves via the PULL FUEL / HYD handles
#1 & #2 Engine Fuel Metering units
Fwd and Aft cargo compartment fire systems
APU fire bottle squibs
Boarding and flight deck done lights
Emergency power for PA system

Dash 8 Q400 (23 decks)

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