Electrical

Question 1

What voltage is the SR series electrical system ?

Answer 1

28 volt

Question 2

How many power sources are there ?

Answer 2

5
2 Alternators
2 Batteries
1 external plug

Question 3

Where is BAT2 located ?

Answer 3

Aft. Under CAPS.

Question 4

Where is BAT1 located ?

Answer 4

passenger side front. behind firewall.

Question 5

What is the primary source of electrical power ?

Answer 5

2 engine driven alternators.

Question 6

What is power output of ALT 2 ?

Answer 6

28.75 volts. 70 AMP

Question 7

What is the power output of ALT1 ?

Answer 7

28 Volt. 100 AMP

Question 8

Where is ALT 1 Mounted ?

Answer 8

Front right of the engine.

Question 9

How is ALT 1 driven in SR20 and SR22 ?

Answer 9

SR20 Belt Driven. SR22 Gear Driven.

Question 10

How is ALT 2 driven in SR20 and SR22 ?

Answer 10

Belt Driven in both.

Question 11

Where is ALT 2 mounted ?

Answer 11

Front Left of engine.

Question 12

What converts ALT output to DC Power ?

Answer 12

Internal Rectifier converts AC to DC.

Question 13

What are details of BAT1 ?

Answer 13

24 volt 10 Amp hour Lead Acid. Supplies power to starter.

Question 14

What are details of BAT2 ?

Answer 14

Two 12 volt 7 Amp hour batteries in series. Total of 7 Amp hours when fully charged.

Question 15

What are the brains of the power system ?

Answer 15

Master Control Unit (MCU). Behind the external plug.

Question 16

What Bus does BAT2 power ?

Answer 16

Essential Bus 1 and Essential Bus 2.

Question 17

What does Essential BUS 1 power ?

Answer 17

All the "1's":
PFD
ADAHRS 1
GPS Nav 1
COM 1
Engine Instruments.

Question 18

What does Essential BUS 2 Power ?

Answer 18

Ice Protection 2
Stall Warning
Roll Trim
Pitch Trim

Question 19

What BUS does BAT1 Power ?

Answer 19

Main Distribution BUS. Constant Power.

Question 20

What does Main Distribution BUS power ?

Answer 20

CAPS
ELT
Convenience Lights.

Question 21

What are the limits of Alternators ?

Answer 21

Not self starting. Require power to start generating. IF BATTERIES are DEAD, won’t be able to get the alternators back online.

Question 22

Why keep the Avionics switch off during startup ?

Answer 22

1) sensitive ICs to voltage/current spikes

2) Allows more power to starter

Question 23

What is function of MCU ?

Answer 23

Manages/Distributes Power to Systems.
Controls Both ALTS, Starter, Landing Light, and external power.
Contains voltage regulators for alternators.

Question 24

Name the Distribution Busses.

Answer 24

Main Distribution Bus 1
Main Distribution Bus 2
Essential Distribution Bus