Electrical

Question 0

Where are the batteries located?

Answer 0

• 1 located in aft equipment bay

- 1 located in nose compartment

Question 1

How many batteries?

Answer 1

-2 nickel cadmium (nicad) batteries

Question 2

What is the external power priority?

Answer 2

-the lowest priority

Question 3

What is the purpose of the IDGs?

Answer 3

Converts variable N2 engine speed to 12,000 RPM generator speed

Question 4

What does an IDG fault light indicate?

Answer 4

High oil temperature or low oil pressure within the IDG

Question 5

AC Bus 1 priority system

Answer 5

• Generator 1
• APU generator
• Generator 2
• External power

Question 6

AC Bus 2 priority system

Answer 6

• Generator 2
• APU generator
• Generator 1
• External power

Question 7

When will AC ESS XFER switch light illuminate?

Answer 7

Anytime the AC BUS 1 is not powering the AC ESS BUS

Question 8

Will the AC ESS XFER light illuminate with just the battery master switch on?

Answer 8

Yes

Question 9

How many TRUs are there?

Answer 9

4

Question 10

IDG overload protection

Answer 10

• 45 KVA for 5 mins

- 60 KVA for 5 seconds

Question 11

When can the IDG be rest if it is disconnected?

Answer 11

Only on the ground after the engine is shut down

Question 12

When will the AVAIL portion of the external power switchlight illuminate?

Answer 12

GPU plugged in with proper voltage, frequency, and phase (115v, 400hz, 3 phase)

Question 13

What does pressing the external AC switchlight on the external panel do?

Answer 13

• Supplies external power to the aircraft in the service configuration
• Powers the AC service bus only

Question 14

What are the 4 AC busses?

Answer 14

• AC bus 1
• AC bus 2
• AC ESS (essential) bus
• AC SERV (service) bus

Question 15

If the AC ESS BUS is being powered by the ADG and a generator is brought back online, will the essential bus switch power sources?

Answer 15

No, the PWR TXFR OVERRIDE button must be pushed

Question 16

When will the ADG deploy?

Answer 16

When AC BUS 1 and 2 are unpowered with weight off wheels

Question 17

What will the ADG power?

Answer 17

Flaps, slats, pitch trim, hydraulic pump 3B, and AC ESS bus

Question 18

With the ADG deployed when must the aircraft be configured by?

Answer 18

140 KIAS

Question 19

Can the ADG be stowed inflight?

Answer 19

No

Question 20

How many DC busses are there?

Answer 20

9

Question 21

What is the purpose of the TRUs?

Answer 21

Converts 115v AC to 28v DC and 120 amps

Question 22

What happens when the DC Service Switch is turned on?

Answer 22

The DC Service Bus is directly connected to the APU Battery Direct Bus

Question 23

What is the main battery rated at?

Answer 23

24v 17 amp/hour

Question 24

What is the APU battery rated at?

Answer 24

24v 43 amp/hour

Question 25

What charges the main battery?

Answer 25

AC BUS 1

Question 26

What charges the APU battery?

Answer 26

AC service bus

Question 27

What happens when the battery switch is turned on?

Answer 27

Battery bus is directly connected to both the Main and APU Battery Direct buses

Question 28

If all generators fail and the ADG is inop, how long can the batteries supply DC emergency power for?

Answer 28

Approximately 30 minutes

Question 29

What supplies power to the fire extinguishers and hydraulic and fuel shutoff valves?

Answer 29

DC EMERG BUS

Question 30

What happens when you turn the DC Service Switch on?

Answer 30

Directly connects the DC SERV BUS to the APU BATT DIR BUS