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J Loadmaster > Electrical System > Flashcards

Electrical System Flashcards

1
Q

What is the extreme (red) voltage range

A

< 100V or > 124V

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2
Q

What is the abnormal (yellow) voltage range

A

100-107V or 118-124V

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3
Q

What is the normal (white) voltage range

A

108-117V

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4
Q

When is the ESS DC BUS OVERLOAD or MAIN DC BUS OVERLOAD ACAWS alert activated

A

If a TR load exceeds 110% for more than 5 seconds

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5
Q

What 3 sources can power AC buses

A

Four engine-driven generators, APU generator, and external power supply

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6
Q

Which AC buses are supplied power when external power is connected

A

All AC buses

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7
Q

Which AC buses are powered by the APU if it is the only power / if others are running

A

Essential and main buses / only essential if others are running

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8
Q

What saying describes how the engine generators power AC buses

A

Wing helps wing, symmetrical helps symmetrical

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9
Q

Which AC buses are supplied power when only one engine is running

A

Only the essential and main AC buses

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10
Q

Why must there be clearance between cargo and fwd bulkhead

A

To allow access to circuit breaker panels

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11
Q

Can MCBs be used as switches?

A

No

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12
Q

Where are the electrical system controls located / where are they duplicated

A

ELECTRICAL panel on overhead console / CNI-MU ELECTRICAL soft panel

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13
Q

Which switch is used to select power sources

A

External power/APU switch

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14
Q

What indicates correct phase AC power is connected

A

AC external power-on light illuminates

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15
Q

How do you reset an engine generator?

A

Switch to OFF/RESET to de-energize the generator, return switch to ON position to reset

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16
Q

What do you need to prepare for when the external power/APU switch will be moved through the OFF position?

A

A 10 second loss of the ICS (intercommunication system) will occur, prepare for alternate forms of communication

17
Q

What are the 6 DC buses

A

Main, essential, isolated, avionics, utility battery, avionics battery

18
Q

What powers the DC system

A

Four TR units that are powered by the main and essential AC buses

19
Q

What are the two identical 24V 35 ampere hour batteries

A

Utility battery (powers utility battery bus); and Avionics battery (powers avionics battery bus)

20
Q

What does the BTRY switch on the ELECTRICAL panel do

A

Connects the utility battery to the isolated DC bus; and the avionics battery to the avionics DC bus

21
Q

What does the BTRY TEST switch do

A

Displays one of the following on the DC voltmeter: isolated DC bus voltage, avionics battery voltage, or utility battery voltage

22
Q

When all 4 engine generators are running and APU is off how is power supplied to the AC buses

A

Each supplies power to one AC bus

23
Q

Where are the UTILITY and AVIONIC BAT CONT circuit breakers located

A

Pilot side circuit breaker panel

J Loadmaster (4 decks)

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