Electrical Sys

Question 1

After eng start …. starter gens supply electrical power

Answer 1

4

Question 2

There are…Ext pwr connections for grd use only

Answer 2

3

Question 3

Electrical Pwr can also be supplied by…Starter Gens

Answer 3

2 APU S/G

Question 4

Apu Star/Gen are a backup source in flight is

Answer 4

1 or more Str/gen are inpo

Question 5

If all elec gens malfunction what will deploy?

Answer 5

RAT

Question 6

The Rat is the ….

Answer 6

Primary Stby Pwr source

Question 7

Is there limits to the RAT operations?

Answer 7

No

Question 8

The 787 have …main AC Buses, which supply power to all the airplane loads

Answer 8

4 AC Buses (L1/2 R1/2)

Question 9

The 4 AC Buses are connected by left and right..

Answer 9

Bus ties: Which Close automatically to keep the main buses energized, if a Str/Gen becomes inop.

Question 10

Tie bus do what?

Answer 10

Connect the main buses

Let Apu energize main buses

Question 11

White boxes on the elec synoptic tells you

Answer 11

Generator is de-energized

Question 12

When battery stw is push which lights come on for the electrical panel?

Answer 12

4 str/gen off & drive lights ( L1/2 R1/2)

Question 13

If external is not connected to the airplane, only …. CCR (common computing Resource) is energized. Which take … … to come online?

Answer 13

Left
…
almost 1 min

Question 14

CCR when start up …

Answer 14

start a number of programs that monitor and control th airplane systems

Question 15

When the CDU shows on the lower display unit, it means..

Answer 15

The left CCR is online

Question 16

Can you start the Apu before CCR is online ?

Answer 16

No

CCR must be online for 35 secs min

Question 17

If external is connected to the airplane, the Left and Right CCR (common computing Resource) will energized. How long will it take to come to come online?

Answer 17

approximately 3 mins

Question 18

Although Left & Right Forward Ext Power are on the same same time. Some airplane systems are…

Answer 18

Load Shed until more power is available

Question 19

Items load shed are shown…

Answer 19

On elec synoptic, under load shed

Question 20

Avail light on the EXT Pwr Stw tells you external pwr is?

And it is shown on the synoptic as

Answer 20

Connected and good quality
….
Green box

Question 21

Fwd ext Pwr can automatically energize…. when an AVAIL light comes on. And the 1st Ext Pwr source that is connected supplies….

Answer 21

Grd handing Loads
…
Power through the main AC buses

Question 22

The ON light for the Ext Pwr, tells you?

The synoptic now shows a …. through the external power boxes

Answer 22

Pwr is connected to the electrical systems.
….
Green line

Question 23

With only 2 External pwr sources (Fwd Ext Left & Right).. What is also loadshead

Answer 23

Air- Cabin air compressors

Question 24

The Aft Ext Pwr is used only for …& ….. It cannot be used to supply pwr to the …..

Answer 24

Engine Starts & Maintenance Grd ops
….

Main buses

Question 25

Aft Ext Pwr connects to large motor power sources like?

Answer 25

Hyd pumps
Cabin Air compressors
Right Eng Start/ Generators

Question 26

When you start engine with ext power only. It’s better to use …External Pwr sources.

Answer 26

3

…

Question 27

Usually fwd ext pwr is connected….. the connection of the aft ext pwr.

Answer 27

Before

Question 28

If only Ext Pwr is available, and bcuz Aft Ext can only energized for Rt eng start. Start …Eng first, then cross start procedure for Starting left eng.

Answer 28

Right eng-> minimize load sheading