Select correct statement:

Each main generator has the capability of providing all AC power for the aircraft if the other generator should fail EXCEPT the blade de-ice system.

Each main generator has the capability of providing all AC power for the aircraft if the other generator should fail INCLUDING the blade de-ice system.

Select correct statement about the APU generator operation while being single source of AC power:

It cannnot power backup pump and windshield anti-ice at the same time. Backup pump has priority.

It can power all equipment on board the aircraft without exceptions

It cannnot power backup pump and windshield anti-ice at the same time. Windshield anti-ice has priority.

Can blade de-ice system be powered by just one electrical generator?

No, at least 2 generators must be running to power the system

Yes, #1 generator has the capability

Yes, either #1 or #2 generator has the capability

When the APU GEN ON advisory is ON, ________________

the APU generator is the sole source of the AC power on board

the APU generator is up and running along one or both main genarators

the APU generator shall be switched ON

List all functions of a GCU (in addition to voltage regulation)

Overvoltage protection Undervoltage protection Underfrequency protection Feeder fault protection

Overvoltage protection Undervoltage protection Underfrequency protection Overfrequency protection

Overvoltage protection Undervoltage protection Underfrequency protection

#1 AC primary bus #2 AC primary bus AC Essential bus

#1 AC primary bus #2 AC primary bus AC Eemergency bus

#1 AC primary bus #2 AC primary bus AC utility bus

External power receptacle is located where?

RH side of the helicopter under the crew chief's window

LH side of the helicopter under the gunner's window

How can the pilot say the external power power is connected?

EXT PWR CONNECTED advisory comes on

APU generator cannot be brought online

In order to let the external power in, ___________________

external power must be inserted, running and the external power switch must be switched ON

only the external power needs to be inserted and running

external power must be inserted, running and the external power monitor must be switched ON

How do you reset the external power monitor?

Move the external power switch to "RESET"

Move the external power switch to OFF, the ON

Push the RESET pushbutton on the external power monitor

List busses tah can be powered by the battery.

Battery utility bus Battery bus DC Essential bus

Battery utility bus Battery hot bus DC Essential bus DC primary buses

What is the condition to be met in order to get the DC power from the battery to the DC essential bus?

There must be no power supplied from #1 or #2 DC Primary busses and the battery switch must be ON

There are no conditions. DC Essential bus is always powered by the battery anytime the battery is connected

There must be no power supplied from #1 or #2 DC Primary busses and the battery must be connected. Battery switch positionn is irrelevant.

#1 CONV and/or #2 CONV caution means:

#1 and/or #2 converter is/are not working

#1 and/or #2 converter are on and running

#1 and/or #2 converter switches are ON

DC ESS BUS OFF caution will come on (disregarding other conditions), when __________________

Ni-Cad battery is at or below 35% state of charge

Lead-acid battery is at or below 23 VDC

Battery is below 40% state of charge

BATT LOW CHARGE caution means, that ______________

SLAB battery is below 23 VDC, or Ni-Cad battery is below 40% charge

SLAB battery is below 40% state of charge, or Ni-Cad battery is below 23 VDC

SLAB battery only is below 23 VDC

BATTERY FAULT caution means:

Ni-Cad battery is low on voltage

Charger/Analyzer is __________________________

only installed when the Ni-Cad batttery is used

only installed when the SLAB battery is used

Charger/Analyzer is __________________________

disengages the DC essential bus when the Ni-Cad battery capacity drops below 35%

disengages the DC essential bus when the battery capacity drops below 23 VDC

receives power from the #1 AC primary bus

Battery Low sensing relay is installed with ________________

both the Ni-Cad and SLAB battery

UH-60A|Electrical

Authored by Jan Kneissl

Professional Development

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MULTIPLE CHOICE QUESTION

1 min • 1 pt

What is the primary source of electrical power of an UH-60 helicopter?

AC current

DC current

External power

#1 or #2 main generator

APU generator

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UH-60A|Electrical

What is the primary source of electrical power of an UH-60 helicopter?

How many independent AC power sources can we find in an UH-60 helicopter?

UH-60's electrical AC generators generate:

How is DC current obtained in an UH-60 helicopter?

Which AC system is capable supplying the total helicopter electrical requirements?

DC current is obtained by conversion from ____________

Which electrical power source has the highest priorty (will supersede another system/s)?

Which power source has higher priority (will supersede the other system)?

Main electrical generators are driven by ______________

Each main electrical generator provides ______________

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