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G550 Recurrent Knowledge Cards > Electrical > Flashcards

Electrical Flashcards

1
Q

The HMG provides power to

A

5 Buses

L and R ESS DC Buses thru the AUX TRU
L and R Standby AC Buses
EMER ESS AC Bus thru the E-Inverter

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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? Which one?

A

Yes. Both switch to the R MAIN AC bus

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4
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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5
Q

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

A

10 Secs

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6
Q

If you lose L MAIN AC Bus, how would you power the L MAIN DC bus?

A

Depress the L TRU switch. Observe ‘RAC’ illuminate in the capsule

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7
Q

What two power sources can power the ESS DC Bus simultaneously?

A 
L/R Main batteries
AUX TRU (When powered by the HMG)
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8
Q

When do the MAIN Battery switches illuminate?

A
  1. When they are powering the ESS buses
  2. When starting the APU
  3. When AUX pump is operating.
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9
Q

All automatic power transfers will be NBPTs except between…

A

External AC and APU power.

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10
Q

What appears in the GEN switch capsule if the GEN FAILED?

A

Amber “OFF”

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11
Q

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

A
  1. R MAIN DC

2. R Batt or Ext DC when using one of the three Ground Service Bus switches.

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12
Q

How can you tell if the Ground Service Bus is powered?

A

Beacon is on

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13
Q

Can the Crew tell if the Ground service bus is on by looking at the cockpit electrical panel?

A

Yes. The GND SVC BUS capsule will have “ON” illuminated

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14
Q

Is GND SVC BUS powered inflight? If so, by what?

A

Yes / R MAIN DC

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15
Q

How many GND SVC BUS switches and where?

A

3

  1. Fwd Ext Switch Panel
  2. Tail Compartment.
  3. Remote Refuel Panel
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16
Q

When will the GND SVC BUS automatically shut off?

A

On the ground, with main door closed and forward external switch service panel AND tail compartment door are closed.

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17
Q

What do the Avionics E-Batts power?

A 
1. Clocks
2, 3. STBY INST Panel (SFD/EBDI)
4. Gear Handle and indicator
5,6. MCDU 1 and 3
7. CAPT Audio Panel
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18
Q

Emer Batts when armed will activate…

A

when an ESS DC power drops below 20 Volts

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19
Q

With E-Batts on, what appears on the MCDU 1 and MCDU 3?

A

MCDU 1 - STBY ENG INST and FUEL

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

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20
Q

When operating on E-Batts which comm can be tuned and how?

A

COM 1 / NAV 1 / ATC 1 on MCDU 3

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21
Q

Can you plug in Ext AC and DC power simultaneously? Which has priority?

A

Yes.

AC has priority

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22
Q

If you plug in Ext AC and DC simultaneously, AC will take priority and power the aircraft. If removed Ext AC power, will DC power automatically pick up the load?

A

No. You have to deselect Ext AC and reselect for DC Ext Power

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23
Q

Why would you use DC EXT Power?

A

Start the APU with low battery voltage

24
Q

When should an open circuit breaker be reset?

A

If the affected component is required for safe flight and landing

25
Q

What is indicated if the R GEN switch displays an amber OFF light?

A

The GCU has tripped

26
Q

If both Generators are inop, which buses does the HMG power?

A

Both standby AC buses, both ESS DC busses, and the ESS AC bus

27
Q

What is the rating of the HMG?

A

10 kVA

28
Q

How is the HMG powered?

A

Left hyd system or PTU

29
Q

Selecting the L Bus tie switch to the ISLN position will:

A

Isolate the L MAIN AC bus from all power except the left IDG

30
Q

The minimum main battery voltage is:

A

22 volts

31
Q

Which battery is used to close the main door from the outside door switch?

A

Only the right battery, which is hard-wired to the main door electrical control circuit

32
Q

The function of the L-R MAIN TRU switch is:

A

The on-side MAIN AC BUS powers each main TRU. In the unlikely event that the on-side MAIN AC BUS should fail, the L-R MAIN TRU switch can be selected to the opposite side MAIN AC BUS to restore the TRU and its respective MAIN DC BUS.

33
Q

In what situation can TRU power more than one bus, which buses can it power?

A

When the HMG and left ESS/right ESS switches are IN/ON, the AUX TRU can power both essential DC buses.

34
Q

If the right main TRU fails, what should automatically power the right main DC bus?

A

the AUX TRU

35
Q

Which batteries are activated when the external battery switch is turned ON?

A

Both main batteries

36
Q

What item will be lost with only one AC power source operating in flight?

A

Galley power

37
Q

During an emergency evac or ditching after dark, how are emergency lights activated?

A

By selecting them ON with the emergency battery switch

38
Q

What will cause the ‘cats eye’ indicator to show white over black in the nav/strob lights?

A

If one or both strobe lights bulbs should fail

39
Q

Why are the NAV lights powered by two different power sources and what are they?

A

If the aircraft has to be towed, the NAV lights can be turned ON with battery power without having to start the APU.
NAV LTS #1 = Left MAIN DC
NAV LTS #2 = Left ESS DC

40
Q

If the landing light switches are left in during flight, when will the lights turn OFF automatically?

A

Passing through 18,000’ (or they will change to “PULSE” mode if the pulse light switch is selected

41
Q

Will the taxi lights turn OFF automatically, if so, when?

A

Upon gear retraction

42
Q

How many emergency lighting batteries are installed?

A

Two

43
Q

During normal ops, the ground service bus receives power from…

A

R MAIN DC Bus

44
Q

From where can the E-Inverter receive power?

A

L or R ESS DC (Normally it receives power from L ESS DC if E inverter is required)

45
Q

How are the E-Batts charged?

A

L Instrument E-Batt - L STBY AC Bus
R Instrument E-Batt - R STBY AC Bus
Forward Lighting E-Batt - L MAIN AC
Aft Lighting E-Batt- R MAIN AC

46
Q

What items are capable of being powered by the battery tie bus?

A

Aux Pump
APU Starter
ESS DC Buses

47
Q

How many TRUs are normally operating in flight?

A

Four, the AUX TRU is in standby mode, available to pick up any, single TRU

48
Q

If the Ground Service Bus is selected on with no power on the aircraft, what will power it?

A

Right Main Battery

49
Q

Which batteries are activated when the external battery switch is turned on?

A

Both main batteries

50
Q

In Flight, how is the ground service bus normally powered?

A

R MAIN DC

51
Q

Whenever the GND SVC BUS is turned on, what light illuminates?

A

Lower beacon

52
Q

Which buses are powered with only external DC connected?

A

L - R ESS and MAIN DC
GND SVC Bus
ESS AC (Phase A only - powered thru the E-Inverter)

53
Q

What electrical components are under the forward floor?

A

TRUs and E-Inverter

54
Q

How many TRUs are on the aircraft?

A

7

5 (L/R MAIN & ESS and AUX)

2 - Battery chargers

55
Q

How many Circuit Panels are there?

A 
7
POP
CPOP
LEER
L PDB
REER - 2
R PDB
56
Q

Which BPCU (Bus power control unit) controls break power transfer control?

A

Left BPCU

G550 Recurrent Knowledge Cards (17 decks)

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