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Gulfstream G450 > Electrical > Flashcards

Electrical Flashcards

1
Q

If a breaker trips, what criteria should be used to determine whether or not to reset?

A

Reset once, only if the affected component is required for safe flight and landing (unless specifically directed by a QRH checklist procedure)

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2
Q

A NBPT can occur between the APU Gen and what other electrical component?

A

Engine IDG

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3
Q

How are BUS TIE isolation contactors controlled (RAXC / LAXC)?

A

By the isolation switches on the cockpit overhead panel, GCUs or BPCUs

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4
Q

What is indicated by an amber OFF light in either GEN switch?

A

the IDG has been isolated by the GCU or the BPCU

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5
Q

During normal operations (IDGs powering aircraft), the Ground Service Bus receives power from which bus?

A

Right Main DC Bus

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6
Q

When does the Emergency Power System activate automatically in the ARM position?

A

ESS DC bus voltage drops too low, or after a 2.5G impact

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7
Q

What buses are powered during HMG operation?

A

Both Standby AC Buses, Both ESS DC buses, ESS AC Bus

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8
Q

Where does the E inverter receive power from?

A

Left or Right ESS DC Bus

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9
Q

When is the AUX TRU capable of providing power to both the left and right ESS DC buses?

A

Standby Electrical Power (HMG)

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10
Q

Where do the battery chargers receive their power inputs from?

A

L and R MAIN AC buses

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11
Q

How many emergency batteries are installed on the airplane?

A

4

LEER, REER and AEER

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12
Q

How are the emergency batteries charged?

A

Left = Left standby AC bus
Right = Right standby AC bus
Forward lighting = Left main AC bus
Aft lighting = Right main AC bus

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13
Q

When do the E-Batts come on in armed position?

A

Less than 20V DC

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14
Q

Minimum battery voltage for APU start?

A

22 V

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15
Q

Below what voltage will main batteries need a maintenance deep cycle recharge?

A

7 V

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16
Q

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

A
  • Aux hydraulic pump
  • APU Starter
  • ESS DC Buses
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17
Q

Below 20 V, approximately how long with it take to fully recharge the batteries?

A

90 Minutes

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18
Q

What 3 items will illuminate the battery switch capsule lights?

A
  • When the batteries are powering the ESS DC buses
  • When the AUX HYD Pump is selected ON
  • When starting the APU
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19
Q

Which battery is utilized to close the main door when using the outside door switch?

A

Right battery, which is wired directly to the main door electrical control circuit

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20
Q

What is the output rating of the HMG?

A

5 kVa = 100% on the synoptic indication

21
Q

How is the HMG powered?

A

Left hydraulic system pressure, or via the PTU (Right pressure, with fluid in the Left hydraulic system)

22
Q

HMG powers which buses?

A

L and R Standby AC Buses, AUX TRU (supplies power to the L and Right ESS DC buses) and the ESS AC Bus through the E Inverter

23
Q

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

A

Galley power

24
Q

How many TRUs are normally operating in flight?

A

5 = 2 Main, 2 ESS and 1 AUX

25
Q

Which TRU is not dedicated to a single bus?

A

AUX TRU

26
Q

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

A

AUX TRU

27
Q

If a generator fails, will a BPT or a NBPT occur?

A

BPT

28
Q

If a generator is selected off while running, will a BPT or a NBPT occur?

A

NBPT

29
Q

If a running engine is shutdown with the fuel control switch, will a BPT or a NBPT power transfer occur?

A

NBPT

30
Q

If an engine fails, will a BPT or a NBPT occur?

A

BPT

31
Q

If the ground service bus is selected ON, what will power the bus if DC external power is connected to the aircraft?

A

DC external power

32
Q

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

A

Right Main DC Bus

33
Q

When the ground service bus is turned on, what light turns on?

A

Lower beacon

34
Q

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

A

Both main batteries

35
Q

What buses are powered with an external DC power cart connected to the aircraft?

A
  • L and R ESS DC
  • L and R Main DC
  • GND SVC Bus
  • ESS AC (via the E inverter)
36
Q

What electrical components are located under the forward floor?

A

TRUs and E Inverter

37
Q

What is the IDG load limit when operating at high ambient air temps?

A

45% (18 kVa) when greater than 43c in order to maintain steady state fuel temperatures below 95c

38
Q

Speedbrake limitation in HMG operations

A

Speedbrakes may be used, provided operation is slow (3 seconds for full range of handle movement)

39
Q

How is the left main TRU powered when the L MAIN TRU switch on the overhead panel is selected to “R AC”?

A

The L MAIN TRU receives power from the R MAIN AC bus

40
Q

What is the indication associated with a battery charger failure?

A

An amber BATT CHGR FAIL (L or R) CAS

41
Q

What will selecting the L BUS TIE switch to the ISLN position do?

A

Isolates the L MAIN AC bus from all power sources except the left IDG

42
Q

What is an IDG and how does it work?

A

Integrated Drive Generator - It operates like a constant speed transmission. As the engine speed changes, the CSD maintains the generator at a constant speed

43
Q

What is the function of the L and R MAIN TRU switches?

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 or R MAIN TRU switch can be selected to the opposite side MAIN AC bus to restore the TRU and its respective MAIN DC bus

44
Q

If using a L or R MAIN TRU switch, what will happen to the failed side ESS DC BUS?

A

Powered automatically by the AUX TRU

45
Q

How is the electrical power control panel normally configured?

A

5 in, 5 out

46
Q

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

A

When the HMG and L ESS / R ESS switches are IN/ON, the AUX TRU can power both ESS DC buses

47
Q

If a ground service bus switch is selected ON with no external power connected to the aircraft, where will the GSB get its power?

A

Right battery

48
Q

Whenever the external battery is turned on, what light turns on?

A

Lower beacon

49
Q

What are two items that will cause one or both battery switch lights to illuminate even while one or more AC generators are operating?

A

Starting the APU or selecting the AUX HYD pump ON

Gulfstream G450 (20 decks)

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