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Gulfstream G550 > Electrical > Flashcards

Electrical Flashcards

1
Q

If a circuit breaker is open, when should it be reset?

A

If the affected component is required for safe flight and landing

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2
Q

A No-Break Power Transfer (NBPT) can only occur between an APU generator and:

A

An Engine Driven Generator (IDG)

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3
Q

The two bus tie isolation contactors are controlled by the:

A

Switches on the cockpit overhead panel, generator control units (GCUs), and Bus Power Control Units (BPCUs)

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4
Q

Speed brake consideration when the standby electrical power system (HMG) is in operation:

A

May be used provided operation is slow (3 seconds for full movement)

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5
Q

If the R GEN switch indicates an AMBER OFF light, what is indicated?

A

The IDG has been isolated by the BPCU

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6
Q

If the L MAIN TRU switch is selected to the R AC position, what happens?

A

The L MAIN TRU will receive power from the R MAIN AC bus

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7
Q

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

A

Right Main DC bus

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8
Q

When does the “ARM” position of the Emergency Power System switches allow the emergency power system to activate?

A

Essential DC bus < 20 VDC

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9
Q

If one battery charger fails, what happens?

A

Amber BATT CHGR FAIL (L or R)

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10
Q

If the HMG is selected on due to inop generators and APU, what buses will be powered?

A

Both Standby AC buses, Both ESS DC buses and the ESS AC bus

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11
Q

The E-Inverter can receive power from what bus?

A

Left or Right ESS DC buses

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12
Q

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

A

HMG

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13
Q

Where do the battery chargers receive their power?

A

From the respective Main AC Bus

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14
Q

What will selecting the L Bus tie switch to the ISLN position do?

A

Isolates the L MAIN AC Bus from all power except the left IDG

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15
Q

How many emergency batteries are installed in the airplane?

A

Four, located in the LEER, REER and BEER(AEER)

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16
Q

How are the emergency batteries charged?

A

Left - L STBY AC Bus
Right - R STBY AC Bus
Forward Lighting - L MAIN AC Bus
Aft Lighting - R MAIN AC Bus

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17
Q

What minimum battery voltage will cause the E-BATTs to come on?

A

< 20VDC

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18
Q

What is the minimum main battery voltage? (For APU start?)

A

22 VDC

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19
Q

Below what voltage would the main batteries require a deep cycle recharge?

A

< 7 VDC

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20
Q

How long does it normally take for a battery deep cycle?

A

24 hours

21
Q

If the batteries actually fell to 20 volts, how long would it take to fully recharge?

A

90 minutes

22
Q

What 3 events will illuminate the battery switch lights?

A
  • When L&R batteries are powering the L&R Essential DC Bus
  • When the AUX HYD PUMP is ON
  • During APU Start
23
Q

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

A

Right Battery, which is wired to the main door switch

24
Q

What is an IDG and how does it work?

A

Integrated Drive Generator - constant speed drive maintains the generator at a constant speed as the engine speed changes

25
Q

What is the rating of the HMG?

A

10 kVA

26
Q

How is the HMG powered?

A

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

27
Q

What will the HMG power?

A

L&R STBY AC Bus and AUX TRU

28
Q

How many TRUs are on the aircraft?

A

5 Total
L&R ESS TRU
L&R MAIN TRU
AUX TRU

29
Q

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

A

If the onside AC Bus should fail, the opposite side AC bus can be selected to power the MAIN TRU on the failed side.

30
Q

If a MAIN AC Bus has failed, and the MAIN TRU selected to get power from the operative side, what will power the ESS DC bus on the failed side?

A

AUX TRU

31
Q

How should the electrical control panel normally be set up (switch positions)?

A

5 In, 5 Out, Batteries Charging

32
Q

What will cause the E-BATTs to come on automatically if armed?

A

If either ESS DC Bus voltage drops below 20 VDC

33
Q

How many TRUs are normally operating in-flight?

A

5 - Main & Essential run continuously while the AUX operates in standby

34
Q

Which TRU is not dedicated to a single bus?

A

AUX TRU

35
Q

In what situation can a TRU power more than one bus?

A

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

36
Q

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

A

AUX TRU

37
Q

If a generator fails, will you get a break-power or no-break-power transfer?

A

Break Power Transfer

38
Q

If a generator is selected off while running, will you get a break power or no break power transfer?

A

No-Break Power Transfer

39
Q

If a running engine is shut down with the fuel control switch, will you get a break power or no break power transfer?

A

No Break Power Transfer

40
Q

If an engine fails, will you get a break power or no break power transfer?

A

Break Power Transfer

41
Q

If a ground service bus is selected on, what will power that bus if there’s a DC cart connected to the aircraft?

A

External DC Power

42
Q

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

A

Right Battery

43
Q

In flight, the ground service bus is normally powered by what bus?

A

R MAIN DC Bus

44
Q

Whenever the ground service bus is turned ON, what else comes on?

A

Lower Beacon

45
Q

Whenever the external battery is turned ON, what else comes on?

A

Lower Beacon

46
Q

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

A

Both Main Batteries

47
Q

What are two items that can cause one or both battery lights to come on even while one or more AC generators are operating?

A

Starting the APU, or selecting the AUX HYD Pump ON

48
Q

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

A

Galley Power

49
Q

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

A

AUX HYD Pump
APU Starter
ESS DC Busses

Gulfstream G550 (18 decks)

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