Electrical

Question 1

What is the maximum amperage of the engine-driven generators?

Answer 1

400 amps. AOM 2-05-05 page 1.

Question 2

What is the maximum amperage of the APU generator?

Answer 2

400 amps up to and including 30,000 ft, 300 amps above 30,000 ft.

AOM 1-01-32 page 1.

Question 3

What are the battery specifications?

Answer 3

24 VDC, 44 Ah NiCad (2). AOM 2-05-05 page 6.

Question 4

Can the GPU charge the batteries?

Answer 4

No. AOM 2-05-05 page 6

Question 5

What is the minimum battery temperature for APU start?

Answer 5

-20°C. AOM 1-01-38 page 1.

Question 6

Which bus supplies power to the inverter?

Answer 6

DC Bus 1. AOM 2-05-05 page 12

Question 7

What are the consumers of inverter power?

Answer 7

TCAS II, EGPWS/Windshear. AOM 2-05-05 pa

Question 8

What light illuminates in the overhead panel GPU button when the GPU is connected and on?

Answer 8

GPU AVAIL. AOM 2-05-05 page 5

Question 9

What should the GPU voltage indicate on the MFD when it is connected and available?

Answer 9

26 VDC to 29 VDC.

                             AOM 1-12-05 page 1.

Question 10

Do the generators or the GPU have priority?

Answer 10

GPU.

       AOM 2-05-05 page 5.

Question 11

Which bus is supplied with power when the GPU is selected and the batteries are OFF?

Answer 11

Ground service bus.

AOM 2-05-05 page 10.

Question 12

What items are powered from the Ground Service Bus?

Answer 12

AOM 2-05-05 page 10.

• Passenger cabin lights
• Lavatory lights
• Galley lights
• Courtesy/stair lights
• Cockpit dome lights
• Baggage/service compartment lights.

Question 13

What is considered an electrical emergency?

Answer 13

Loss of all generators.

AOM 2-05-10 page 25.

Question 14

The batteries can supply essential power for how many minutes in the event of an electrical emergency?

Answer 14

40 minutes, which includes 3 APU start attempts.

AOM 2-05-05 page 6

Question 15

What does the Essential Power Button do?

Answer 15

Overrides auto transfer (EDL logic) to electrical emergency configuration and ensure batteries power only the Essential Buses. Isolates batteries from DC buses.

AOM 2-05-15 page 3.

Question 16

On the ground with the batteries as the only power source, do you have shed bus power?

Answer 16

No.

Will selecting OVRD on the SHED BUSES knob connect the shed buses? No.

AOM 2-05-05 page 6.

Question 17

What requirement is there on the ground in order to connect the shed buses?

Answer 17

SHED BUSES OVRD with at least one generator online. AOM 2-05-05 page 9.

Question 18

A BATT 1 (2) OVTEMP Warning message occurs at what temperature?

Answer 18

Above 70°C. AOM 2-05-05 page 6.

Question 19

What is the memory item for battery overtemperature?

Answer 19

Affected Battery…OFF. AOM 1-03-03 page 1.

Question 20

On the ground, when are all the DC buses energized?

Answer 20

• At least three generators are on
• The GPU is on and connected to the airplane
• At least one generator is on and the SHED BUSES Selector Knob is set to OVRD

AOM 2-05-05 page 9.