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Gulfstream GIV > Electrical > Flashcards

Electrical Flashcards

1
Q

What is the minimum acceptable battery voltage when performing a battery integrity check?

A

22 volts DC

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2
Q

What is the voltage and ampere rating of the batteries?

A

24 volts DC

40 ampere-hours

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3
Q

With the battery switches selected ON and no other power on the aircraft, which electrical buses are shown as powered on the EPMP?

A

Essential DC bus (powered by the batteries)

Essential AC bus (powered by the “E” inverter)

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4
Q

With the battery power selected “ON” and no other power sources available, what are the acceptable readings for the Essential AC and DC bus volts?

A

Essential AC bus – 115 volts AC, 400 Hz

Essential DC bus – 22-27 volts

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5
Q

What buses are powered with either external battery switch selected ON?

A

Only the essential buses

  • ESS DC = batteries
  • ESS AC (Phase A only) through “E” inverter
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6
Q

Where can information be found concerning items powered by the emergency batteries?

A

QRH, Electrical System Abnormal Procedures tab (EA)

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7
Q

How are the emergency batteries normally tested?

A

Arm the emergency battery switch with no other power on the aircraft

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8
Q

Where are the feeder bus circuit breakers located?

A

On the power distribution box (PDB), in the right radio rack

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9
Q

How is AC external power connected to the aircraft?

A

Select the AUX PWR switch ON with at least 1 battery switch ON

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10
Q

What is the function of the battery override switch on the AC external power receptacle?

A

To connect AC power to the aircraft if the batteries are discharged or removed

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11
Q

What buses are powered with external DC power connected?

A

All DC buses are powered (ESS DC, L & R MAIN DC), and ESS AC (Phase A only) through the “E” inverter

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12
Q

What buses are powered with external AC power connected?

A

All buses are powered AND the batteries will be charged

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13
Q

Is it possible to charge the batteries using DC external power?

A

No, the respective MAIN AC buses must be powered in order to charge the batteries

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14
Q

What is the output rating of the “E” inverter?

A

800 volt-amps

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15
Q

What is a valid indication of “E” inverter operation?

A

Essential voltmeter switch-light selection on the EPMP and indications of 115 volts, 400 Hz

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16
Q

What buses are powered by the “E” inverter?

A

Essential AC bus, phase “A” only

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17
Q

What are the possible sources of power for the “E” inverter?

A
  • Whatever is powering the Essential DC bus

- The standby electrical power system (HMG)

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18
Q

What are the 2 main functions of the battery chargers?

A
  • To charge their respective battery

- To provide a transformer-rectifier mode of operation for supplemental power, if necessary

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19
Q

What buses supply power to the battery chargers?

A

Battery charger #1 (left) – LEFT MAIN AC BUS

Battery charger #2 (right) – RIGHT MAIN AC BUS

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20
Q

Can one battery charger charge both batteries?

A

No, only its respective battery

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21
Q

What is the maximum output of the battery chargers in transformer-rectifier mode?

A

50 amps each, for a total of 100 amps

22
Q

What situations would cause the battery chargers to operate in transformer-rectifier mode? (3)

A
  • When the AUX hydraulic pump is selected on
  • APU start button is depressed
  • Selection of ESS DC Bus Battery Switch to “ON” (Manually or Automatically)
23
Q

What is the output of the converters?

A
  • AC output – 115 volts AC at 400 Hz, 23 KVA
  • DC output – 28 volts DC, 250 amps
    thus 28 X 250 = 7000 VA or 7 KVA
24
Q

If a converter failure occurs, what are the resulting indications?

A
  • The respective “AC POWER FAIL” and “DC POWER FAIL” amber CAS messages will illuminate
  • The affected AC and DC buses will automatically switch over to the next available
    power source
25
What is the difference in the corrective action for a “DC POWER FAIL” CAS message versus an “AC POWER FAIL” CAS message?
- If a “DC POWER FAIL” CAS message illuminates, converter operation may be continued and monitored - If an “AC POWER FAIL” CAS message illuminates, the converter must be turned OFF because the cooling fans require AC power to operate
26
If an amber “CONV FAN FAIL” CAS message occurs, what does this indicate?
At least one of the 5 converter fans have failed
27
Is converter operation permitted with a converter fan inoperative?
Yes, for a designated period of time (25 hours)
28
What is the immediate consideration with a dual converter failure in flight?
NAACP Symbol generator N- normal A- alternate A- alternate Fuel (This is primary, immediate consideration) C- cross flow open P- single pump operation
29
What is the engine-driven alternator output?
115 volts AC, 3-phase, 30 KVA
30
Control of electrical current and auto-switching for AC and DC is supplied from what components?
AC and DC bus power control units (BPCUs)
31
When might you use the standby electrical power system? (2)
- With Dual Converter Failure above 15,000 feet until you are able to start the APU alternator as a source of electrical power - With an ESS DC Bus on battery power fault
32
What is the minimum HP % RPM to consider when using the standby electrical power system (HMG)?
67% HP RPM
33
What are the considerations regarding the use of the SEPS for landing? (7)
- Do not use thrust reversers - Do not use automatic ground spoilers (They will not be available with loss of Left Main DC) - Maintain a minimum of 67% HP RPM (Engines will remain at 67% with loss of Main DC) - Landing Gear extension may cause the SEPS to go off line - Turn the emergency batteries ON as a backup - Be prepared to cycle the SEPS switch if it cycles off line - Deploy the speedbrake handle slowly upon landing
34
What buses are powered when using the SEPS?
- Essential DC bus (through the TRU) | - Essential AC bus, phase “A” only (through the “E” inverter)
35
During SEPS operation, why might the utility pump operate continuously if it is armed?
Because the control circuit is on the L MAIN DC bus, which may no longer be powered (utility solenoid shutoff valve fails to the OPEN position)
36
What are the functions of the TRU? (4)
- To convert AC power into DC power. - Power the Left, Right Main DC, and ESS DC buses during APU / EXT AC power operations. - Power ESS DC bus during SEPS operations. - Act as a backup to the DC converters in-flight.
37
What is the maximum output of the TRU?
300 amps
38
Where does the EPMP receive its power from?
From the remote power supply (RPS)
39
On the EPMP, the left and right voltmeter selector switches allow the monitoring of what components?
The left and right converters
40
The “ESS” power monitor switch on the EPMP, when selected, provides display information about which electrical power sources?
Essential DC and Essential AC bus voltages
41
Why are the six EPMP “AUTO” bus switches selected under normal flight conditions?
To allow the bus power control units (BPCUs) to select the best available power source for each bus
42
What is the normal power source for the Essential DC bus after engine start with both converter switches selected ON?
Whatever power source is providing power to the left main DC bus (normally the DC portion of the left converter)
43
What is indicated by the battery ammeters on the EPMP?
Battery charge and discharge in amps
44
What is indicated by an amber “EPMP POWER FAIL” CAS message?
At least one of the 4 input power sources to the remote power supply (RPS) has failed
45
With a left converter failed, what is most likely power source for the L MAIN DC bus?
The TRU
46
What power source normally provides power to the ESS DC bus in flight?
The DC portion of the left converter, through the L MAIN DC bus
47
What power source normally provides power to the ESS AC bus in flight?
The AC portion of the left converter, through the L MAIN AC bus
48
What is indicated by an amber AC or DC reset light?
A fault on an AC or DC bus
49
Is it possible to start the APU using external DC power?
Yes, but the QRH must be referenced: Follow “APU” Starting using external DC power procedures in QRH in the APU operation (NB section)
50
If the APU is running and the AUX PWR switch is selected ON, what would happen if both battery switches were selected OFF?
No change would occur, the APU alternator would continue to provide power to the main and essential buses
51
What is the maximum allowable AC AUX PWR load indication prior to starting the TAY engine?
35 % | 30 % at high elevation
52
If the ESS DC BUS AUTO, LEFT MAIN and BATT switch light capsules are illuminated simultaneously in flight, what likely has occurred?
The K20 / K22 relay has experienced a failure of one of the relay poles, report for maintenance action

Gulfstream GIV (21 decks)

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