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G550 Daily Questions > Electrical > Flashcards

Electrical Flashcards

1
Q

The HMG (Hydraulic Motor Generator) provides:

A

AC power to the AUX TRU and Standby AC Buses

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2
Q

What is the normal AC power source for the AUX TRU and ESS AC bus?

A

L MAIN AC bus

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3
Q

If the L MAIN AC bus is unpowered, will the AUX TRU and ESS AC bus automatically switch to another power source?

A

Yes. Both switch to the R MAIN AC bus

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4
Q

What is the “DEAD BUS” power logic for the AUX TRU?

A
  • ESS bus before MAIN

- LEFT side before RIGHT side

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5
Q

What is the purpose of the E-inverter?

A

Provides AC power for the ESS AC bus (if the ESS AC bus loses power)

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6
Q

What is the normal position of the E INV switch?

A

AUTO

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7
Q

How long do you wait between selections of L ESS and R ESS when using the HMG?

A

10 seconds

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8
Q

The 60 Hz converter can be used to:

A

Power the outlets in the galley and passenger cabin

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9
Q

If you lose L MAIN AC BUS power, what happens automatically?

A
  • AUX TRU transfers to R MAIN AC BUS
  • AUX TRU Powers L ESS DC Bus
  • ESS AC bus transfers to R MAIN AC Bus
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10
Q

How would you power the L MAIN DC Bus, if you lost the L MAIN AC Bus?

A

Use the L TRU switch / Push / Observe RAC (switch capsule)

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11
Q

What two (2) sources can power ESS DC buses simultaneously?

A
  • L/R Main batteries

- AUX TRU (when powered by the HMG)

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12
Q

When do you push the RESET switch?

A

CAS MSG / CHECKLIST says to push it

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13
Q

The MAIN BATTERY switches illuminate ON when the MAIN BATTERIES are being used:

A
  • Powering the ESS buses (batteries are being used)
  • When starting the APU
  • When AUX pump is operating
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14
Q

Describe a BREAK POWER TRANSFER

A

A momentary interruption of power to one or several busses

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15
Q

All automatic power transfers will be NBPT’s except between:

A

External AC power and APU generator

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16
Q

What is the function of BUS TIE ISLN SWITCH?

A
  • Prevents / Allows alternate power sources to power failed bus side
  • Allows you to isolate buses
17
Q

What is the color of the GEN switch if the generator is turned off?

A

Black - Grey

18
Q

The ground service bus may be powered on the ground by:

A
  • R MAIN DC BUS, when available

- R battery or directly from external DC power receptacle when using one of three switches

19
Q

How can you tell if GND SVC Bus is powered?

A

Beacon is illuminated

20
Q

Can you look at the Electrical Panel and tell if the GND SVC BUS is powered?

A

GND SVC BUS capsule will have “ON” illuminated

21
Q

Is GND SVC BUS powered in flight? And by what?

A
  • Yes

- R MAIN DC bus

22
Q

What appears in the GEN switch if the GEN FAILED?

A
  • Amber “OFF”
23
Q

How many GND SVC BUS are there and where are they located?

A
  • 3 (three)
  • Forward External Switch Panel Access Door
  • Tail Compartment
  • Remote Refuel Panel behind Captain seat in cockpit
24
Q

How do you know the generator has failed by looking at the synoptic?

A

GEN is outlined in Amber

25
Q

Will GND SVC BUS turn off automatically?

A

Yes, when main cabin door, forward external switch panel access door and tail compartment door are all closed

26
Q

How many E-BATTS are there?

A

Four (4)

27
Q

What do the E BATTS power?

A
  • Avionics - (2)

- Emergency Lighting (2)

28
Q

What do the Avionics E-BATTS Power?

A
  • Clocks
  • STBY INST Panel (SFD / EBDI)
  • Gear Handle and Indicator
  • MCDU’s 1 & 3
  • CAPT Audio Panel
29
Q

Emergency Batteries (E-BATTS) when armed will activate when:

A

An ESS DC bus power drops below twenty volts

30
Q

With E-BATTS on, what appears on MCDU 1 & MCDU 3?

A

MCDU 1 - STBY ENG INST & FUEL

MCDU 3 - BACK UP RADIOS (VHF 1 COM / NAV) and ATC 1

31
Q

When the aircraft operates on emergency batteries the crew can only tune:

A

COM 1 / NAV 1 / ATC 1 on MCDU 3

32
Q

In emergency battery mode the:

A

Cockpit speakers are not available

33
Q

ACP on E-BATTS - illuminate

A

Captain - COM 1 / SPKR ICS + Phone + MIC

34
Q

Can you plug in AC and DC external power at the same time?

A

Yes

35
Q

Which external power source has priority? AC or DC external power?

A

AC

36
Q

If you remove AC external power will it Auto Switch to DC external power?

A

No, you have to deselect EXT PWR switch and RESELECT for DC EXT PWR

37
Q

Why would you use DC EXT PWR?

A

Start APU with low battery voltage

G550 Daily Questions (17 decks)

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