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Gulfstream 550 > Electrical > Flashcards

Electrical Flashcards

1
Q

When should an open circuit breaker be reset?

A

If the affected component is required for safe flight and landing

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2
Q

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

A

The GCU has tripped

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3
Q

When does the ARM position of the emergency power system switches allow the emergency power system to activate?

A

When the ESS DC bus voltage drops below 20 volts, or after 2.5 G impact

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4
Q

What buses will be powered with inoperative generators and APU, if HMG is selected on?

A

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

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5
Q

What is the rating of the hydraulic Motor Generator (HMG)?

A

10 kva

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6
Q

How is the HMG powered?

A

Left hydraulic system pressure or PTU (provided fluid is in the left system)

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7
Q

Selecting the L Bus tie switch to ISLN position will?

A

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

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8
Q

The battery voltage which will cause the E BATTS to come on is?

A

< 20 volts DC

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9
Q

The minimum main battery voltage is?

A

22 Volts

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10
Q

What 3 items will illuminate the battery switch capsule lights?

A

When L & R batteries are powering the L-R ESSENTIAL DC BUS

whatever the aux hydraulic pump is on

During APU start

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11
Q

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

A

Only the right battery, which is wired to the main door switch

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12
Q

What is an IDG and how does it work?

A

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

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13
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 TRU can be selected to the opposite side MAIN AC BUS to restore the TRU and its respective MAIN DC BUS

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14
Q

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

A

When the HMG and left ESS/ right ESS switches are IN/ON,

the AUX TRU can power both ESS DC BUSES

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15
Q

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

A

AUX TRU

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16
Q

If ground service bus switch is selected ON, what will power that bus?

A

DC external power or the battery if external power is not available

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17
Q

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

A

Both main batteries

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18
Q

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

A

Galley power

19
Q

What type of Main DC Batteries are installed in the 550?

A

NICAD batteries

24volt, 53 amps

20
Q

A no brake power transfer can occur between the APU and what other electrical component?

A

An engine driven generator (IDG)

21
Q

How are Bus Tie isolation contactor relays controlled?

A

By isolation switches on the cockpit overhead panel,
the Generator Control Unit (GCU), or
the Bus Power Control Unit (BPCU)

22
Q

What is indicated by an AMBER OFF light in either engine generator switch?

A

The IDG has been isolated by the GCU and the BPCU

23
Q

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

A

In this configuration, the L MAIN TRU receives power from the R MAIN AC bus

24
Q

What is the indication associated with a batterie charger failure?

A

An amber BATT CHGR FAILL CAS message will illuminate

25
Q

From where can the E inverter receive power?

A

From LEFT or RIGHT ESS DC bus ( normally the left bus supplies power if the E inverter is required)

26
Q

The AUX TRU is capable of providing power to both the left and right ESS DC buses simultaneously during what type of electrical operation?

A

Standby electrical power (HMG)

27
Q

From where do the battery chargers receive their power inputs?

A

From L and R MAIN AC buses

28
Q

How many E Batts are installed and where are they located?

A

Four

Located in the LEER, REER, AEER

29
Q

How are the E Batts charged?

A

Left instrument battery- Left standby AC bus
Right instrument battery- Right standby AC bus
Forward lighting battery- left main AC bus
Aft lighting battery- right main AC bus

30
Q

Below what voltage will the main batteries require maintenance deep cycle recharge?

A

7 volts

31
Q

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

A
  • Aux hydraulic pump
  • APU starter
  • ESS DC buses
32
Q

How long does it take to recharge an undamaged, discharged battery?

A

90 mins

33
Q

What 3 items will illuminate the battery switch capsule lights?

A
  • When the batteries are powering the ESS DC bus
  • Aux pump is selected on
  • when starting the APU
34
Q

Which buses will the HMG power?

A

L-R STANDBY AC BUS and AUX TRU, which supplies power to the L-R ESS DC buses and the ESS AC bus, phase A through the E inverter.

35
Q

How many TRU’s are normally operating inflight?

A

Four total

36
Q

Which TRU is not dedicated to a single bus?

A

AUX TRU

37
Q

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

A

DC external power

38
Q

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

A

From the right battery

39
Q

Inflight, how is the ground service bus normally powered?

A

From the R MAIN DC BUS

40
Q

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

A

Lower Beacon

41
Q

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

A

Lower beacon

42
Q

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

A
  • L and R ESS DC
  • L and R MAIN DC
  • GND SVC BUS
  • ESS AC ( phase A only, through the E inverter
43
Q

What electrical components are located underneath the forward floor

A

TRUs and E inverter

Gulfstream 550 (17 decks)

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