AIR COND / PRESS / VENTILATION

Question 1

1 | Which valves will receive a close command when the DITCHING pushbutton is depressed (ARPO)?
[ FCOM-DSC-21-20-30 ]

Answer 1

º Avionics Inlet and Extract valves
º Ram air inlet
º Pack Flow Control valves
º Outflow valve (only if in AUTO mode)
º FWD cargo outlet isolation valve

Question 2

2 | Will the DITCHING pushbutton always close the outflow valve? [ FCOM-DSC-21-20-40 ]

Answer 2

º Not if the outflow valve is under manual control

Question 3

3 | Can the pilot control the outflow valve? [ FCOM-DSC-21-20-30 ]

Answer 3

º Yes, select MAN on the MODE SEL and use the MAN V/S CTL switch

Question 4

4 | How many auto controllers are in the pressurization system? [ FCOM-DSC-21-20-30 ]

Answer 4

º 2, only one is used at a time and they swap roles after each landing

Question 5

5 | How do you manually switch controllers? [ FCOM-DSC-21-20-40 ]

Answer 5

º Switch MODE SEL to MAN for 10 seconds, then back to AUTO

Question 6

6 | What does an amber FAULT light in the MODE SEL pushbutton indicate? [ FCOM-DSC-21-20-40 ]

Answer 6

º Both automatic pressure controllers are faulty

Question 7

7 | From what source does the pressurization system normally obtain landing elevation? [ FCOM-DSC-21-20-40 ]

Answer 7

º FMGC database

Question 8

8 | If the FMGC database does not supply the landing elevation, how do you set the landing elevation?
[ FCOM-DSC-21-20-40 ]

Answer 8

º Manually by selecting landing elevation via the LDG ELEV knob.

Question 9

9 | What protects the airframe from excessive cabin differential pressure? [ FCOM-DSC-21-20-20 ]

Answer 9

º 2 pressure relief valves (safety valves)

Question 10

10 |How many outflow valve motors are installed? [ FCOM-DSC-21-20-20 ]

Answer 10

º 3 total. One for each CPC, and one for manual control.

Question 11

11 |How would a pilot manually control the pressurization? [ FCOM-DSC-21-20-10 ]

Answer 11

º By selecting MAN on the MODE SEL pb and utilizing the MAN v/s CTL toggle switch.

Question 12

12 |What flow rate is automatically selected when APU bleed air is in use or during single pack operation?
[ FCOM-DSC-21-10-50 ]

Answer 12

º HI

Question 13

13 |If the engine bleed air in-flight is too low what will occur? [ FCOM-DSC-21-20-30 ]

Answer 13

º Engine speed is automatically increased to provide adequate bleed air pressure

Question 14

14 |What would cause an amber FAULT light to illuminate in the PACK 1 and/or Pack 2 pushbutton (OOD)?
[ FCOM-DSC-21-10-50 ]

Answer 14

º Overheat - Pack outlet
º Overheat - Compressor outlet
º Discontinuity - Switch position disagreement with pack flow control valve
Note: FAULT light will be illuminated when no bleed air is supplied

Question 15

15 |At what cabin differential pressure does the RAM AIR valve open? [ FCOM-DSC-21-10-20 ]

Answer 15

º 1 PSI ΔP or less

Question 16

16 |What causes the Pack Flow Control valve to automatically close? [ FCOM-DSC-21-10-50 ]

Answer 16

º Upstream pressure below minimum
º Pack overheat
º Engine start sequence
º Engine FIRE pushbutton on the related side pressed
º DITCHING pushbutton is selected

Question 17

17 |What does an amber FAULT light in the HOT AIR pushbutton indicate? [ FCOM-DSC-21-10-50 ]

Answer 17

º Duct overheat - the Hot Air and Trim Air valves close automatically

Question 18

18 |How many Air Conditioning System Controllers are there & how many lanes do they have? [ FCOM-DSC-21-10-10 ]

Answer 18

º 2 Air Conditioning System Controllers
º Each Air Conditioning System Controller has 2 lanes – (Active/Standby)

Question 19

19 |Describe how the Air Conditioning System Controllers regulate temperature? [ FCOM-DSC-21-10-30 ]

Answer 19

º Basic temperature regulation: Both packs produce the required outlet temperature determined by
the lowest demanded zone temperature
º Optimized temperature regulation: Hot air is added to the individual zones by the trim air valves to maintain the desired zone temperatures

Question 20

20 |What occurs when an active lane of an Air Conditioning System Controller fails? [ FCOM-DSC-21-10-40 ]

Answer 20

º The second lane takes over

Question 21

21 |What occurs when both lanes of an Air Conditioning System Controller (ACSC) fail? [ FCOM-DSC-21-10-40 ]

Answer 21

º The related pack is lost. The hot air pressure regulating valve and associated trim air valve(s) close

Question 22

22 |How does the Air Conditioning System Controller configure its associated pack ram air inlet flap for takeoff and landing to avoid the ingestion of foreign matter? [ FCOM-DSC-21-10-30 ]

Answer 22

º Takeoff: Pack Ram Air Inlet Flap closes when takeoff power is set and the main landing gear struts are compressed. Reopens after main landing gear strut extension
º Landing: Pack Ram Air Inlet Flap closes as soon as the main landing gear struts are compressed and speed ≥ 70 knots. Opens 20 seconds after speed < 70 knots

Question 23

23 |If an air cycle machine (ACM) fails, what occurs? [ FCOM-DSC-21-20-40 ]

Answer 23

º The affected pack will operate as a heat exchanger

Question 24

24 |What effect will the engine start sequence have on the pack flow control valves? [ FCOM-DSC-21-10-20 ]

Answer 24

º The pack flow control valve will close automatically

Question 25

25 |What does the CARGO HEAT HOT AIR amber FAULT light indicate? [ FCOM-DSC-21-40-30 ]

Answer 25

º Duct overheat

Question 26

26 |What is the purpose of the CABIN FANS? [ FCOM-DSC-21-10-20 ]

Answer 26

º To re-circulate cabin air to the mixing chamber and then back to the cabin

Question 27

27 |With BLOWER and EXTRACT pushbuttons in AUTO how does the system operate? [ FCOM-DSC21-30-20, FCOM-DSC-21-30-60 ]

Answer 27

º Ground – system is normally in the OPEN configuration º Flight – system is normally in the CLOSED configuration º Intermediate – Closed configuration except small internal flap in Extract Valve is open

Question 28

28 |With both BLOWER and EXTRACT pushbuttons in OVRD (smoke configuration) what are the positions of the INLET and EXTRACT valves? [ FCOM-DSC-21-30-20 ]

Answer 28

º INLET valve CLOSED º EXTRACT valve OPEN

Question 29

29 |What is the status of the Blower and Extract fans with the Blower and Extract valves in OVRD? [ FCOM-DSC-21-30-20 ]

Answer 29

º BLOWER fan OFF º EXTRACT fan ON

Question 30

30 |When is air conditioning introduced into the avionics compartment? [ FCOM-DSC-21-30-20 ]

Answer 30

º Abnormal operation º SMOKE configuration

Question 31

31 |Is the skin heat exchanger ever bypassed in flight? [ FCOM-DSC-21-30-20 ]

Answer 31

º Yes; during SMOKE configuration

Question 32

32 |What does an amber FAULT light on the BLOWER pushbutton indicate? [ FCOM-DSC-21-30-60 ]

Answer 32

º SMOKE warning is activated º Computer power supply failure º Low blower pressure º Duct overheat

Question 33

33 |What does an amber FAULT light on the EXTRACT pushbutton indicate? [ FCOM-DSC-21-30-60 ]

Answer 33

º SMOKE Warning is activated º Computer power supply failure º Low Extract pressure

Question 34

34 |With 2 FAULT lights on the VENTILATION panel are there any other indications? [ FCOM-DSC-26-30-20 ]

Answer 34

º Yes – The SMOKE light in the GEN 1 LINE pushbutton