Electrical

Question 1

Describe the main generator.

Answer 1

Starter/Generator.

28V/300 amps.

Shaft driven by the AGB.

Question 2

Describe Generator 2.

Answer 2

115 A

Belt driven by AGB.

Question 3

What does generator 2 power during normal operations?

Answer 3

Gen 2 Bus

Question 4

What does the main generator power during normal operations?

Answer 4

Gen 1 Bus

Question 5

Describe the batteries.

Answer 5

Either 1 or 2.

Lead Acid.

24V, 42 amp hour.

Question 6

How long will batteries supply power by themselves?

Answer 6

20 minutes–loads of less than 60 A.

30 minutes–loads less than 50 A.

Question 7

Can the DC system be powered by a GPU?

Answer 7

Yes.

Question 8

What amps are required of a GPU for systems and for start?

Answer 8

500 amps for systems.

1000 amps for start.

Question 9

What electrical system protection is in place for usage of a GPU?

Answer 9

External power control unit will disconnect power if voltage goes above 29.5 V or below 23 V.

Question 10

How many volts is the electrical system?

Answer 10

28 volts

Question 11

Name the items on the hot battery bus.

Answer 11

Clock
Cockpit dome light 50%
Cargo door motor
Cargo door light
Standby bus

Question 12

Where are the batteries housed?

Answer 12

Aft Fuselage

Question 13

What does the Standby Bus power?

Answer 13

Audio Panel
VHF NAV/COMM 1
GPS 1
Avionics Blower

Question 14

What is the Battery Bus powered by?

Answer 14

GEN 1 normal ops.

Battery when GEN 1 is offline.

Question 15

What powers the Generator 1 Bus?

Answer 15

GEN 1 during normal ops.

Question 16

What powers the Generator 2 Bus?

Answer 16

GEN 2 during normal ops.

Question 17

What powers the Non-Essential Bus?

Answer 17

GEN 1 during normal ops.

Question 18

What powers Avionics 1 Bus?

Answer 18

GEN 1 during normal ops.

Question 19

What powers Avionics 2 Bus?

Answer 19

GEN 1 during normal ops.

Question 20

What does the Bus Tie Interlock do?

Answer 20

Allows either generator to charge the battery or power systems in the event of a single generator failure.

Question 21

CAWS “GEN 2 OFF” describe what happens?

Answer 21

GEN 2 has failed.

GEN 2 Tie closes and GEN 1 supplies all bus bars.

Question 22

CAWS “GEN 1 OFF” describe what happens?

Answer 22

GEN 1 has failed.

GEN 2 Tie closes and GEN 2 supplies all bus bars.

Question 23

CAWS “ESNTL BUS” means?

Answer 23

BAT 1, GEN 1, or GEN 2 is below 22V.

Question 24

CAWS “AV BUS” means?

Answer 24

Either Avionics Bus is below 22V.

Question 25

CAWS “BAT OFF” means?

Answer 25

Battery is offline.

Question 26

CAWS “BATTERY” means?

Answer 26

Battery Overvoltage or Overcurrent.

Question 27

CAWS “BUS TIE” means?

Answer 27

Bus Tie is open.

Question 28

CAWS “INVERTER” means?

Answer 28

Inverter below 20V.

Question 29

If GEN 1 or GEN 2 exceed limits what warning do you get?

Answer 29

CAWS “EIS CAUTION”

Question 30

How many inverters are there?

Answer 30

Two 26 VAC 400 Hz static inverters.

Question 31

What are the ratings on the emergency battery?

Answer 31

24V, 5Ah Lead Acid.

Question 32

When does the EPS Emergency Power System Activate?

Answer 32

Battery Bus failure or total power loss.

Question 33

What does the EPS power?

Answer 33

COMM/NAV 1
Standby Attitude Indicator
Lighting circuits of CDI and Standby Attitude Indicator

Question 34

What powers Inverter 1?

Answer 34

GEN 1

Question 35

What powers Inverter 2?

Answer 35

Battery Bus

Question 36

Bus 2 Tie is normally?

Answer 36

Closed.

Question 37

If Bus 2 tie opens how old you know?

Answer 37

CAWS BUS TIE would illuminate.

Question 38

GEN 2 tie is normally?

Answer 38

Open when GEN2 is online.