Electrical

Question 1

Max generator load on the ground

Answer 1

200 amps, 250 amps up to 4 minutes

Question 2

Max generator load in flight

Answer 2

300 amps, 450 amps up to 2 minutes in an emergency

Question 3

Generator start limit

Answer 3

3 starts in 30 minutes with 90 second rest between starts

Question 4

Battery start limit

Answer 4

3 starts per hour

Question 5

How much does a generator assisted cross start count toward the battery start limitation

Answer 5

1/3 of a battery start

Question 6

How much does a GPU start count toward the battery start limitation?

Answer 6

Does not count

Question 7

APU start cycle limitation

Answer 7

3 start cycles per 30 minutes. 3 cycles of operation with 90 second rest periods between start cycles.

Question 8

How many times can the battery start the APU?

Answer 8

9 APU start cycles per hour

Question 9

How much does an APU start count toward the battery limitation?

Answer 9

One APU start = 1/3 of a battery start

Question 10

What are the four main functions of the GCU?

Answer 10

Regulates (generator to 28.5 volts)
Parallels (load sharing to within 40 amps)
Protects (from faults)
Controls the power to their respective main DC feed bus

Question 11

The GCU protects the electrical system (specifically generators) from what 5 things

Answer 11

Reverse Current
Under Voltage
Feeder Fault
Over Voltage
Ground Fault

Question 12

Name the locations of the three standby batteries and what they power.

Answer 12

Left nose compartment - standby attitude indicator (Meggitt) (30 minutes)
Right nose compartment - AHRS (30 minutes)
Cockpit & Cabin for - emergency lights (10 minutes)