Electrical System

Question 1

What are the sources of electrical power, and what are they rated at?

Answer 1

• 28 VDC, 300 amp starter/generator
• 24 VDC lead acid battery
• 24 VDC auxilliary battery
• external power receptacle

Question 2

How are the busses and circuit breakers layed out in the cockpit?

Answer 2

• Battery bus circuit breakers are on the left console panels
• Generator bus circuit breakers are on the right console panels

Question 3

How do you reset the generator if it malfunctions in flight?

Answer 3

• By pressing the generator reset button, or
• By cycling the GEN switch off and back on

Question 4

What equipment is automatically shed when the red GEN warning illuminates on EICAS?

Answer 4

Air conditioning

Question 5

Describe the main battery.

Answer 5

Aerobatic, 24 VDC, 42 amp-hour, lead acid battery capable of powering all electrical systems except air conditioning.

Question 6

Describe the auxilliary battery.

Answer 6

24 VDC, 5 amp-hour battery located in the left avionics comparment

Question 7

What does the auxilliary battery power?

Answer 7

It provides emergency power to the backup flight instrument, radio relays, inertial reference unit (IRU), standby VHF control, and FIRE 1 warning system for approximately 30 minutes.

Question 8

How can you test the auxilliary battery?

Answer 8

Press and hold the AUX BAT test switch for a minimum of 5 seconds, ensuring the test light remains illuminated while the switch is held.

Question 9

Where is the external power receptacle located?

Answer 9

In the left, aft fuselage, below the left avionics bay door.

Question 10

How is external power distributed and controlled?

Answer 10

External power is distributed on the battery bus and is controlled by the battery switch.

Question 11

Should you connect external power if the battery voltage has dropped below 22 volts?

Answer 11

No. Doing so could damage the aircraft battery

Question 12

What does the amber BUS TIE caution message indicate?

Answer 12

• bus tie has failed, OR
• BUS TIE is set to OPEN

Question 13

What will happen if the battery or battery bus fails while the BUS TIE caution is illuminated?

Answer 13

Items on the battery bus will not be powered

Question 14

What happens if the generator fails while the BUS TIE caution is illuminated?

Answer 14

Items on the generator bus will not be powered. Expect a minimum of 30 minutes of battery power to the battery bus items.

Question 15

What happens if the generator bus fails?

Answer 15

Items on the generator bus will not be powered, but if the BUS TIE switch is in the NORM position, the generator continues to power the battery bus and charge the battery