ELEC Panel

Question 1

COMM pb - ON

Answer 1

Powers:

• Cabin and cargo lights
• Toilets
• Drain mast ice protection
• Galleys
• In flight entertainment

Question 2

COMM pb - OFF

Answer 2

Above equipment unpowered

Question 3

GALLEY pb - AUTO

Answer 3

Powers:
-Main Galley*
-Secondary galley
In flight entertainment*

*Main galley shed and IFE shed when only one gen is operating, unless on the ground only IFE shed

Question 4

GALLEY pb - Fault Light (Amber)

Answer 4

Any generator load > 100%

Question 5

GALLEY pb - OFF

Answer 5

Both Galleys and IFE are unpowered

Question 6

BAT 1 2 pb - AUTO

Answer 6

Battery contactors are closed when:

• APU start (Max 3 minutes during EMER GEN ops)
• Battery voltage <26.5 until 4 amps (after 30 min delay in flight)
• AC1 and AC2 buses are unpowered and <100kts or EMER gen not supplying power
• Battery contactors are open if battery voltage is low (on the ground with no power supply)

Question 7

BAT 1 2 pb - Fault Light (Amber)

Answer 7

Battery charger current is out of limits

Question 8

BAT 1 2 pb - OFF light (White)

Answer 8

Battery contactors are open (light powered by DC BAT BUS)

Question 9

BAT 1/BAT 2 - Voltage Indication

Answer 9

Battery Voltage

Question 10

IDG 1 2 pb - Fault light (Amber)

Answer 10

High oil temp

Low oil pressure (Inhibited below 14% N2)

Question 11

IDG 1 2 pb - Pushed

Answer 11

Disconnects IDG
Can only be reconnected on the ground
Caution - following may cause damage
-holding pb for more than 3 seconds
-disconnecting an engine that is not running or windmilling

Question 12

GEN 1 2 pb - Fault light (Amber)

Answer 12

GCU trip

Line contactor open (other than by pb)

Question 13

GEN 1 2 pb - OFF light (White)

Answer 13

Generator will not power electrical system

Reset

Question 14

GEN 1 2 pb - Pushed (Dark)

Answer 14

Generator powers electrical system

Question 15

APU GEN pb - Fault light (Amber)

Answer 15

GCU trip
Line contactor open
Inhibited at low speed

Question 16

APU GEN pb - OFF ( White)

Answer 16

Generator will not power electrical system

Reset

Question 17

APU GEN pb - Pushed (Dark)

Answer 17

If EXT power and engine generators not in use, APU powers electrical system

Question 18

BUS TIE pb - AUTO

Answer 18

Automatically closes one or both contactors to maintain power supply to AC1 and AC2 based on aircraft priority:

• Engine generator
• EXT Power (if selected on)
• APU generator

Question 19

BUS TIE ob - OFF light (White)

Answer 19

Both bus tie contactors open

Question 20

EXT PWR - AVAIL light (Green)

Answer 20

Plugged in and good power

Question 21

EXT PWR - ON light (Blue)

Answer 21

EXT PWR is not being used:
-EXT PWR powers electrical system
If EXT PWR is being used:
-EXT PWR removed from electrical system

Question 22

AC ESS FEED - Fault Light (Amber)

Answer 22

AC ESS Bus not powered

Question 23

AC ESS FEED - ALTN light (White)

Answer 23

AC 2 bus supplies AC ESS Bus

Question 24

AC ESS FEED - Normal

Answer 24

AC 1 BUS supplies AC ESS Bus