Electrical

Question 1

Battery Switch
OFF
ON

Answer 1

OFF- battery connected to the battery direct bus only and is charging
ON- connects battery to DC transfer bus and the battery direct bus (ADD DC TRANSFER BUS)

Question 2

EMER PWR Selector
OFF
ARM
ON

Answer 2

OFF- Emergenc power is off. Reset Auto Emergency power system
ARM-Supplies EMER power automatically when power loss to the EMER OR DC bus is detected
ON- EMER power is on. Battery supplies power for AC EMER BUS (through Static inverter) and DC EMER BUS.

Question 3

How do you test EMER POWER

Answer 3

On ground with both engine off. AUTO test when the switch is moved to ARM. ON light illuminates and EMER PWR TEST alert is displayed. Sucessful test once all lights extinguish

Question 4

What should the EMER PWR selctor o when everyone leaves the aircraft

Answer 4

Off

Question 5

What buses are on the EMER PWR and how long

Answer 5

60 MINS
B- Battery Direct bus
E- Emergency AC BUS (Through Emer Invereter)
E- Emergency DC Bus
D- DC Transfer Bus

Question 6

What do the L/R Tie switches do
Open
Auto

Answer 6

OPEN- Respective Generator cannot power the tie bus. Can also be used to reset a bus tie lockout on the groud
AUTO- Gen bus tie connection is controlled automaticall to meet aircraft power requirements

Question 7

DC Bus tie switch
OPEN
AUTO

Answer 7

OPEN - Opens all three DC bus tie relays

AUTO- DC bus tie relays are automatically controlled to ensure DC buses are powered

Question 8

L/R GEN SWITCHES
RESET
OFF
ON

Answer 8

RESET- Reset the generator
OFF- Disconnects the generators from the respective bus
ON- Allows an operating generator to supply power to its respective bus

Question 9

APU Power switch
RESET
OFF
ON

Answer 9

RESET- Resets the generator
OFF- Disconnects the APU generator from the tie bus
ON- Allows an operating APU generator to supply power to the tie bus

Question 10

What happens when APU generator is power the tie bus

Answer 10

ON light illuminates blue

Question 11

EXT Power switch
OFF
ON

Answer 11

OFF- Disconnects EXT PWR from the tie bus

ON- Connects external power to the tie bus

Question 12

How do you know when external power is avaiable

Answer 12

AVAIL light illuminates green when external power is connected and within limits

Question 13

GND SERVICE ELEC PWR Switch
OFF
ON

Answer 13

OFF- Neutral position for ground service panel

ON- Connects external power to the AC ground service bus and powers the DC ground service bus.

Question 14

What happens if the EXT power switch is off

Answer 14

ON light indicates blue

Question 15

GALLEY PWR Switch
OFF
ON

Answer 15

OFF - Galley power is off
ON- Galley power on. If a generator fails a single generator sheds galley lights to conserve power. Can. Also. Be used to reset a galley load shed

Question 16

Electrical Panel control meanings
Amber, Green and Blue lights
EMER PWR
APR PWR ON
APU, L/R GEN, EXT PWR LIGHTS
EXT PWR

Answer 16

EMER PWR - Amber when emer power on
APR PWR ON - Blue APU is powering bus tie
APU, L/R GEN, EXT PWR LIGHTS - Indicate Pwer source to associated bus
EXT PWR - Green Availanel light when connected within limits