Electrical System

Question 1

What provides primary DC power for the aircraft?

Answer 1

two engine-driven generators which, during
normal operations, operate in parallel.

Question 2

What is the output of the engine-driven generators?

Answer 2

Each generator is rated at 14,2-14,8 Vdc, 40 Amp

Question 3

What do the engine-driven generators feature?

Answer 3

integrated voltage regulators and automatic overvoltage devices

Question 4

What is the point of the integrated voltage regulators?

Answer 4

maintain a constant output voltage

Question 5

What is the point of the automatic overvoltage devices?

Answer 5

protect the circuits and the electric components from
an excessive voltage caused by generator failures

Question 6

Can the aircraft operate on only one of the two engine-driven generators?

Answer 6

Yes

Question 7

What provides secondary power for the aircraft?

Answer 7

A 12v, 38amp battery and an optional external DC power receptacle

Question 8

How many busses are featured in the electrical system?

Answer 8

Five -
Battery bus
LH Generator bus
RH Generator bus
LH Avionic bus
RH Avionic bus

Question 9

How does the distribution system operate (electrical flow)?

Answer 9

The distribution system operates as a single bus with power being supplied by the
battery and both generators but it is possible to separate the left busses from the
right busses when required by means of the Cross Bus switches.

Question 10

What do the cross bus switches do?

Answer 10

When the switch is set to off, it separates the selected generator and corresponding avionics bus from the battery bus and opposite side busses (isolate the sides)

Question 11

What do the LH/RH Field switches do?

Answer 11

Control (on/off) the corresponding generator

Question 12

What do the LH/RH Avionic switches do?

Answer 12

Power or cut off (on/off) the corresponding avionics bus

Question 13

How are loads divided on the busses?

Answer 13

on the basis of their importance
and required power: equipment with duplicate functions are connected to
separate busses.

Question 14

What items are on the Battery bus?

Answer 14

The most important ones

Question 15

What items are directly on the battery?

Answer 15

• Emergency back-up attitude indicator (RH attitude indicator – usually supplied
  from RH generator bus), when installed;
• Emergency Light
• Chronometer

Question 15

Items on the LH Busses

Answer 15

Question 16

Items on the RH Busses

Answer 16

Question 17

What does the Master switch do?

Answer 17

allows for connecting,
through the battery relay, the battery to the battery bus

Question 18

What are the electrical switch positions during normal operations?

Answer 18

When both generators are correctly operating and all above mentioned switches
are in ON position, all the busses are connected to the generators

Question 20

Electrical system diagram

Answer 20