Electrical System

Question 1

What Volatage does is the electrical system

Answer 1

28V DC

Question 2

Describe the Battery

Answer 2

There is a single 24 Volt (42-amp hour lead acid) battery located in the right wing

Question 3

Describe the Starter Generators

Answer 3

There are two 30 Volt (Regulated to 28.25 +/- .25 Volts) 250 amp starter gens connected in parallel. Either generator can supply the entire electrical load

Question 4

How is AC power supplied

Answer 4

DC power is supplied to one of two inverters, which supply 400 Hz, 115V and 26V AC power for various avionics

Question 5

What are the 10 major DC electrical buses

Answer 5

1. Hot Battery Bus
2. Main Battery Bus
3. Left Generator Bus
4. Right Generator Bus
5. Isolation Bus
6. No. 1 Dual Fed Bus
7. No. 2 Dual Fed Bus
8. No. 3 Dual Fed Bus
9. No. 4 Dual Fed Bus
10. The Avionics Buses

Question 6

What is supplied by the Hot Battery Bus

Answer 6

1. Engine fire extinguisher
2. Firewall Shutoff Valves
3. Entry and Cargo lights
4. Clocks

Question 7

The generator buses are connect by what amperage of current limiters

Answer 7

325 Amp

Question 8

How are the 4 dual-fed buses powered

Answer 8

By either generator bus, through a:
60-amp limiter
70-amp diode
and a 50 amp circuit breaker

Question 9

Describe the GPU requirements

Answer 9

Must be capable of supplying up to 1000 Amps (300 max continuous)

1. Ground power source polarity is correct
2. Battery switch is on
3. The GPU voltage is not greater than 32 Volts

The battery must show a minimum charge of at least 20 Volts