Electrical System

Question 1

General description of components:

Answer 1

Storage: Two 24v batteries (one of them is two 12v batteries in series(

Generation: two alternators.
ALT 1 is gear driven (g6 sr20) 100amp, 28v

ALT 2 is belt driven (g6sr20) 70amp, 28.75v

Distribution consists of: Main bus 1,2 and Essential bus which are housed in the Master control unit (MCU)

Circuit breakers, Voltage suppressors/regulators and electrical diodes.

Question 2

What do the voltage regulators do?

Answer 2

They regulate Alt 1 voltage to 28v and Alt 2 voltage to 28.75v.

Question 3

What happens if over voltage occurs?

Answer 3

The MCU has a voltage suppressor which will take the ALT offline when voltage exceeds approx. 32v

Question 4

Explain the general flow of electricity:

Answer 4

Alt 2 will power Main bus 2 and the Essential bus

Alt 1 will power Main bus 1 only

Question 5

What is on Main bus 1? and where does it get its power?

Answer 5

A/C, Fan, Landing light, EVS camera, convenience outlet, MFD A

ALT 1

Question 6

What is on Main Bus 2? and where does it get its power?

Answer 6

Starter, avionics fan 1, lights, pitot heat, flaps,

Avionics, ice lights, Stdby attitude B, MFD B, cabin lights, Fuel qty, AP servos, keypad and cabin air control

Avionics Fan 2, GPS/NAV GIA 2, Com 2, ADAHRS 2, Fuel pump, PFD B

ALT 2

Question 7

What is on the essential bus? where does it get its power?

Answer 7

Bat 2, GPS/NAV GIA 1, Com 1, ADAHRS 1, Stndby attitude A, PFD A, Engine inst, stall warning, trim, Alt 2

Alt 2 and Bat 2

Question 8

What does an electrical diode do?

Answer 8

allows electricity to flow only one way