AIR SYSTEM & PRESS.

Question 1

What the air conditioning system supply?

Answer 1

Conditioned outside air temperature and recirculated cabin air at controlled temperature throughout the airplane

Question 2

Which are the automatic functions of the air system

Answer 2

Pack control,

zone temp control,

cabin recirculation,

fault detection,

overheat protection

Question 3

How many CAC are installed in the 787

Answer 3

4 CAC two each pack

Question 4

When the deflector door may retract

Answer 4

When temp is below 2 degrees or above 35

Question 5

When the deflector door extend

Answer 5

During landing phases or in ground

Question 6

How many packs we have on board

Answer 6

2 packs and for each pack two CAC supplies pressurized air

Question 7

Can a single CAC provide sufficient air to operate it s associated pack in any condition

Answer 7

Yes it can provide sufficient air to it’s pack

Question 8

On grd how many CAC runs with APU power

Answer 8

Normally with APU on in grd on CAC each pack is ON

Question 9

How many CAC are working during engine start up

Answer 9

None

Question 10

How many minutes before pack restart after engine start

Answer 10

2 minute and angine running

Question 11

Cold weather ops how many CAC are ON in grd

Answer 11

Both CAC in each pack are commanded on

Question 12

In-Flight assisted start how many CAC runs

Answer 12

Only one CAC runs

Question 13

Single engine go around and slat autogap needed how many pack are shed

Answer 13

Both of them and eicas PACK L R may show no pilot action required

Question 14

What is the stby cooling mode

Answer 14

Is a backup function of the normal PACK mode , the affected pack has less capacity then NORMAL pack mode and it stops to work at LOW ALTITUDE AND HOT TEMPERATURES and restart in cold and high altitude

Question 15

Alternate ventilation system

Answer 15

AVS provides ventilation to the cabin when both PACK are inop.When airplane is depressurized and switch is ON the AVS on -8 opens the fwd and aft outflow valve fully while in -9 opens the FWD at 10’ and the aft 01 o’clock

Question 16

Cabin Temp range

Answer 16

18-29 cabin crew may adjust +- 3

Question 17

Humidification system

Answer 17

Start to work when cruising above 25000 ft for more then 20 min and auto switch off 1/1.30 min before touchdown

Question 18

Which cargo compartments are heated and available to trnasport live and perishable

Answer 18

FWD AND BULK

Question 19

FWD CARGO TEMP RANGE

Answer 19

4-27

Question 20

EQUIPMENT COOLING FWD AFT OVERRIDE MODE IF

Answer 20

BOTH FAN SUPPLY FAIL
LOW AIRFLOW DETECTED
SMOKE DETECTED
HIGH TEMP DETECTED
FIRE SWITCH IN ARM MODE
OVERRIDE SWITCH PRESSED ON
BOTH FLOW SENSOR FAIL

Question 21

WHAT IS A PECS

Answer 21

POWER ELETRONICS COOLING SYSTEM for large motor power distribution system located in AFT E/E compartments,the systems consists in two indipendents pumps and loops

Question 22

How the system can maintain the pressurization of the plane?

Answer 22

Discharging conditioned air from the 2 outflow valves

Question 23

How may outflow valves are installed in the b787?

Answer 23

Total of 2 one FWD one AFT

Question 24

Why we have POSITIVE and NEGATIVE relief valves?

Answer 24

To protect the fuselage against excessive pressure differential

Question 25

Which modes are available for pressurization system

Answer 25

MANUAL AND AUTOMATIC

Question 26

In which modes operates the CPCS

Answer 26

CLIMB CRUISE AND DESCENT MODE

Question 27

During unplanned level off what happen to the cabin altitude

Answer 27

The cabin altitude stop to climb until the airplane start again to climb

Question 28

What happen to the cabin altitude in case of planned level off?

Answer 28

Will continue to climb to the target cabin altitude

Question 29

How the system adjust the climb and pressurization

Answer 29

Using flight plan data insert in the fmc and using ambient pressure

Question 30

How high can be a cabin altitude in 787

Answer 30

Normally up to 6000ft but in degraded mode can reach 8000 ft