717 Lod Section 6: Electrical

Front 1

Disclaimer: I created this deck for my own personal study. It hasn't been QAd or approved by any airline, aircraft manufacturer, or regulatory agency.

Back 1

DYODD!

Front 2

ELEC SD Symbology

What does it mean when the boxes around the power buses are Green?

Back 2

The bus has normal power.

Hint 2

ELEC 001

Vol 2, 6-10

Front 3

ELEC SD Symbology

What does it mean when the boxes around the power buses are Amber OFF?

Back 3

The bus does not have power.

Hint 3

ELEC 001

Vol 2, 6-10

Front 4

ELEC SD Symbology

What does it mean when the battery symbol's green?

Back 4

The battery is discharging normally.

Hint 4

ELEC 001

Vol 2, 6-10

Front 5

ELEC SD Symbology

What does it mean when the battery symbol's amber?

Back 5

Battery voltage is less than normal OR battery discharge is abnormal. Voltage digits will be boxed and amber

Hint 5

ELEC 001

Vol 2, 6-10

Front 6

ELEC SD Symbology

What does it mean when the battery symbol's white?

Back 6

No load on the battery. Load numerics are white in all conditions.

Hint 6

ELEC 001

Vol 2, 6-10

Front 7

ELEC SD Symbology

What does it mean when the Transformer Rectifier symbol & text are White? Amber?

Back 7

White = Normal ops

Amber = TR is failed

Hint 7

ELEC 001

Vol 2, 6-10

Front 8

ELEC SD Symbology

What does it mean when the Generator icon is Green?

Back 8

Gen is on. V & f are within limits.

Hint 8

ELEC 001

Vol 2, 6-10

Front 9

ELEC SD Symbology

What does it mean when the Generator icon & text is Amber?

Back 9

Gen tripped off. V, f, & load current digits are boxed amber if no w/in limits.

Hint 9

ELEC 001

Vol 2, 6-10

Front 10

ELEC SD Symbology

What does it mean when the Generator icon is White?

Back 10

Engine isn't on OR Gen is turned off.

V & f digits are white if w/in limits or engine isn't operating. Load current digits are white if w/in limits.

Hint 10

ELEC 001

Vol 2, 6-10

Front 11

ELEC SD Symbology

What does it mean when the External Power icon is white? Green? Blank?

Back 11

White = External pwr's available. EXT switch is off or the main external pwr relay is tripped.

Green = External pwr's on & supplying power.

Blank = Not connected.

Hint 11

ELEC 001

Vol 2, 6-10

Front 12

ELEC SD Symbology

What does it mean when the APU icon is White? Green?

Back 12

White = APU pwr's available, but the gen's off due to APU GEN sw in OFF or APU pwr relay tripped.

Green = APU's pwrd on & supplying pwr.

Hint 12

ELEC 001

Vol 2, 6-10

Front 13

ELEC SD Symbology

What does it mean when the APU icon is Amber? Blank?

Back 13

Amber = APU's available. APU GEN tripped off.

Blank = APU pwr not available.

Hint 13

ELEC 001

Vol 2, 6-10

Front 14

ELEC SD Symbology

What does it mean when the Bus Tie Relay icon is Green? Amber? White?

Back 14

Green = Relay's closed. Normal conditions.

Amber = Relay's tripped open.

White = Relay's opened. Normal condition.

Hint 14

ELEC 001

Vol 2, 6-10

Front 15

ELEC SD Symbology

What does it mean when a Power Relay icon is Green? Amber? White?

Back 15

Green = Relay's closed. Normal conditions.

Amber = Relay's tripped open.

White = Relay's opened. Normal condition.

Hint 15

ELEC 001

Vol 2, 6-10

Front 16

ELEC SD Symbology

What does it mean when a DC Tie Relay is Green? Amber? White?

Back 16

Green = Relay's closed. Normal conditions.

Amber = Relay's tripped open.

White = Relay's opened. Normal condition.

Hint 16

ELEC 001

Vol 2, 6-10

Front 17

ELEC SD Symbology

What does it mean when schematic flow lines are white?

Back 17

Normal powered condition

Hint 17

ELEC 001

Vol 2, 6-10

Front 18

With battery switch OFF, what is the battery connected to?

Back 18

Battery direct bus only (battery charging not effected)

Hint 18

ELEC 002

Vol 2, 6-10

Front 19

With battery switch ON, what is the battery connected to?

Back 19

Battery direct bus AND

DC transfer bus

Hint 19

ELEC 002

Vol 2, 6-10

Front 20

When and how can we test EMER PWR?

Back 20

On ground w both engines shut down, move switch from OFF to ARM. A good test's indicated when EMER PWR TEST alert & EMER PWR ON light both go out.

Hint 20

ELEC 003

Vol 2, 6-10

Vol 2, 6-20

Vol 1, NP-20

Front 21

When in ARM, when does the EMER PWR supply emergency power?

Back 21

Automatically when power loss in the EMER AC or DC bus is detected

Hint 21

ELEC 003

Vol 2, 6-10

Vol 2, 6-20

Vol 1, NP-20

Front 22

If external power is available and both pilots leave the flight deck, what should be done?

Back 22

EMER PWR selector to OFF

Hint 22

ELEC 003

Vol 2, 6-10

Vol 2, 6-20

Vol 1, NP-20

Front 23

What happens when EMER PWR is ON?

Back 23

Battery supplies power for AC EMER bus (thru a static inverter) and DC EMER bus

Hint 23

ELEC 003

Vol 2, 6-10

Vol 2, 6-20

Vol 1, NP-20

Front 24

Which buses are powered by EMER power? And for how long?

Back 24

Battery direct bus

DC Transfer bus

Emergency AC bus (thru emergency inverter)

Emergency DC bus

It lasts for approx 60 minutes.

Hint 24

ELEC 004

Vol 2, 6-10

Front 25

What happens when the BUS TIE switches are in OPEN?

Back 25

Respective generator can't power the tie bus. Can also be used to reset a bus tie lockout on the ground.

Hint 25

ELEC 005

Vol 2, 6-10

Front 26

What happens when the BUS TIE switches are in AUTO?

Back 26

Generator bus to Tie bus connection is controlled automatically to meet power requirements

Hint 26

ELEC 005

Vol 2, 6-10

Front 27

What happens when we move the DC BUS TIE switch to OPEN?

Back 27

Open=Opens all 3 DC bus tie relays

Hint 27

ELEC 005

Vol 2, 6-10

Front 28

What do the L/R GEN switches do?

RESET=

OFF=

ON=

Back 28

RESET= Resets the gen.

OFF= Disconnects the generator from its respective bus

ON= Allows an operating generator to supply power to its respective bus

Hint 28

ELEC 007

Vol 2, 6-10

Front 29

What the APU Power switch ON do?

OFF?

RESET?

Back 29

ON=Allows APU generator to supply power to the tie bus

OFF= Disconnects the APU gen from the tie bus

RESET= Resets the generator

Hint 29

ELEC 008

Vol 2, 6-10

Front 30

What does EXT power switch do in ON position? OFF?

Back 30

ON=Connects EXT PWR to tie bus.

OFF=Disconnects EXT PWR from the tie bus.

Hint 30

ELEC 009

Vol 2, 6-10

Front 31

What's the function of the OFF position of the GND SERVICE ELEC PWR switch? How about the ON position?

Back 31

OFF= Neutral position for ground service power.

ON= Connects external power to the AC ground service bus & powers the DC ground service bus. EXT power switch is OFF.

Hint 31

ELEC 010

Vol 2, 6-10

Front 32

What's does turning the GALLEY PWR switch OFF do? How about ON?

Back 32

OFF= Galley power off.

ON= Galley power on.

Hint 32

ELEC 011

Vol 2, 6-10

Front 33

When may we still see a break in power (despite the NBPT)?

Back 33

During transfer from APU to an external source OR if a supplying generator experiences unexpected loss of power (due to flameout, unexpected shutdown, etc.)

Hint 33

ELEC 012

Vol 2, 6-20

Front 34

What does No Break Power Transfer (NBPT) do?

Back 34

Normally, it ensures that all electrical power source transfers will occur without power interruption.

Hint 34

ELEC 012

Vol 2, 6-10

Front 35

What does a green EXT PWR AVAIL mean?

Back 35

EXT power connected and within limits

Hint 35

ELEC 013

Vol 2, 6-20

Front 36

On the Electrical Panel, the EMER PWR light is what color? The EXT PWR light? All other lights?

Back 36

EMER PWR = Amber

EXT PWR = Green

All other lights = Blue

Hint 36

ELEC 013

Vol 2, 6-10