Electrics

Question 1

Name the five different sources of AC power

Answer 1

2 IDG:s
1 APU
1 Inverter
1 RAT
1 AC external power receptacle

Question 2

Name three different DC power sources

Answer 2

1 DC external power receptacle
2 NiCd batteries
3 TRU:s

Question 3

When does the led light next to the IDG selector knob illuminate?

Answer 3

When you get EICAS caution IDG 1(2) OIL.

This is to indicate which one to disconnect.

Question 4

What is checked regarding AC power when you see ”AVAIL” in the GPU push button?

Answer 4

1. Voltage
2. Amperage
3. Frequency

Question 5

Which battery is used for APU starting?

Answer 5

Battery 2

Question 6

What does it mean that a line between two components is green on the electrical synoptic page?

Answer 6

Voltage is sensed.

If not the line is white.

Question 7

When RAT is deployed, how many seconds before you get AC power from the RAT to which bus?

Answer 7

After 8 seconds RAT supplies 115 VAC to the AC ESS BUS

Question 8

What is the voltage and the Amperage of the two NiCd batteries?

Answer 8

22,8 V

27 A

Question 9

EICAS warning “BATT 1(2) OVERTEMP”

What temperature is sensed in the battery?

Answer 9

70 degrees C

Question 10

Where is SPDA 1 located?

Answer 10

FWD e-bay

Question 11

Where is SPDA 2 located?

Answer 11

Center e-bay

Question 12

What is the priority order regarding power sources in normal ops?

Answer 12

1. Respective IDG
2. APU generator
3. GPU
4. Opposite IDG

Question 13

What is shed by the SPDA:s when you get EICAS advisory message “LOAD SHED”?

Answer 13

1. Galley
2. Right hand windshield heating

Question 14

What does the EICAS warning “ELEC EMERCENCY” mean?

Answer 14

AC main buses are deenergized.

Question 15

What does the EICAS caution “GPU CONNECTED” mean?

Answer 15

1. AC/DC GPU is connected and;
2. Parking brake released