The emergency load switch is ____________________

installed in all B412, but only operable in helicopters from s/n 33108 on (some canadian CAA exceptions possible)

installed in all B412, but only operable in early helicopters up to s/n 33107

installed only in helicopters with s/n 33108 and on

STGs as installed on standard B412s are ________________

derated to 150 A, but capable of 200 A

Under normal circumstances, each STG supplies power directly to _______________________

main bus and both non-essential buses

both main buses and one non-essential bus

Essential buses are fed from ________________________

emergency busses through emergency power switches

In case of one STG failure (any reason), both non-essential buses _______________

are automatically disconnected, power to non-essential buses may be restored by moving the NON-ESNTL BUS to "override" position

are automatically disconnected, power to non-essesntial buses cannot be restored under such circumstances

must be manually disconnected by moving the "NON-ESNTL BUS" switch to OFF position

One of the conditions that must be met to connect the generator to the electrical system is:

The voltage on the output of the generator must be more than that on corresponding main bus

Battery must be disconnected from the system

DC GENERATOR caution comes on when _____________________

generator is disconnected from the main bus

GCU senses higher voltage on generator output than on main bus

GCU controls the generator (maintains output at 28V) through ________________

modifing the field energizing (excitation) current of each generator

modifying the generator rotational speed

Generators temperatures _______________________

are monitored with a temperature switch

are monitored with a temperature transducer

Battery _________________________ to the battery bus

connects through 1 battery relay

connects through 2 battery relays

Battery is connected _________ to __________ and from there it connects to the DC system through ___________________

permanently - battery bus - 2 battery relays

through a battery relay - shedding bus - one battery relay

permanently - battery relay - battery bus

Under normal circumstances, when both generators are supplying power to the DC system, __________________

battery relay 1 is automatically de-energized (open)

battery relay 2 is automatically de-energized (open)

both battery relays are energized (close)

The "BATTERY" caution will be ON when _____________________

both battery relays are in the same position (open or close)

one of the battery relays is open

Battery interlock relay __________________

controls Battery bus switch 1 only

controls both Battery Bus switches

controls Battery bus switch 2 only

Under normal conditions, INV 1 supplies power to ____________________

No. 1 and 2 115 and 26,5 VAC buses

Under emergency conditions, INV 1 supplies power to ______________________

Emergency buses on later helicopters

No. 1 and 2 115 and 26,5 VAC buses

In case of one invertor failure, the other invertor supplies power to

No. 1 and 2 115 and 26,5 VAC buses

Emergency buses on later helicopters

Bell 412 - ATA 24 - Electrical

Authored by Jan Kneissl

Professional Development

Used 3+ times

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26,5 and 115 VAC

28 VDC

24 VAC

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Bell 412 - ATA 24 - Electrical

In principal, how many basic electrical systems can be found in B412 helicopters?

Electrical systems of B412 principally differ ________________________

On early B412 models, the one-switch load shedding is ____________

B412 DC electrical system provides _______________

B412 AC electrical system provides _______________

The primary B412 electrical power is _______________

The secondary B412 electrical power is _____________

B412 AC electrical system runs at _________________

Basic aircraft battery is a ____________ battery

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