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Flashcards in AIR SYSTEM & PRESS. Deck (30)
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1

What the air conditioning system supply?

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

2

Which are the automatic functions of the air system

Pack control,

zone temp control,

cabin recirculation,

fault detection,

overheat protection

3

How many CAC are installed in the 787

4 CAC two each pack

4

When the deflector door may retract

When temp is below 2 degrees or above 35

5

When the deflector door extend

During landing phases or in ground

6

How many packs we have on board

2 packs and for each pack two CAC supplies pressurized air

7

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

Yes it can provide sufficient air to it’s pack

8

On grd how many CAC runs with APU power

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

9

How many CAC are working during engine start up

None

10

How many minutes before pack restart after engine start

2 minute and angine running

11

Cold weather ops how many CAC are ON in grd

Both CAC in each pack are commanded on

12

In-Flight assisted start how many CAC runs

Only one CAC runs

13

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

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

14

What is the stby cooling mode

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

15

Alternate ventilation system

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

16

Cabin Temp range

18-29 cabin crew may adjust +- 3

17

Humidification system

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

18

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

FWD AND BULK

19

FWD CARGO TEMP RANGE

4-27

20

EQUIPMENT COOLING FWD AFT OVERRIDE MODE IF

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

21

WHAT IS A PECS

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

22

How the system can maintain the pressurization of the plane?

Discharging conditioned air from the 2 outflow valves

23

How may outflow valves are installed in the b787?

Total of 2 one FWD one AFT

24

Why we have POSITIVE and NEGATIVE relief valves?

To protect the fuselage against excessive pressure differential

25

Which modes are available for pressurization system

MANUAL AND AUTOMATIC

26

In which modes operates the CPCS

CLIMB CRUISE AND DESCENT MODE

27

During unplanned level off what happen to the cabin altitude

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

28

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

Will continue to climb to the target cabin altitude

29

How the system adjust the climb and pressurization

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

30

How high can be a cabin altitude in 787

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