SH Chapter 2 - Air Systems

Question 1

1) Which valves will receive a close command when the DITCHING pushbutton is depressed (ARPO)?

Answer 1

• Avionics ventilation inlet & outlet fans
• Ram Air inlet
• Pack flow control valves
• Outflow valve

Question 2

2) Will the DITCHING pushbutton always close the outflow valve?

Answer 2

No. Only when the pressurization mode is in Auto

Question 3

3) Can the pilot control the outflow valve?

Answer 3

Yes. When MODE SEL pb in MAN (manual pressurization mode)

Question 4

4) How many controllers are in the pressurization system?

Answer 4

Two. Identical digital pressurization controllers (CPCs)

Question 5

5) How do you manually switch controllers?

Answer 5

Switching to MAN for at least 10 seconds, then back to Auto (MODE SEL pb on CABIN PRESS panel)

Question 6

6) What does an amber FAULT light in the MODE SEL pushbutton indicate?

Answer 6

Both CPCs have failed

Question 7

7) From what source does the pressurization system obtain landing elevation?

Answer 7

Auto - FMGC 1

Semi Auto - LDG ELEV Knob

Question 8

8) When the mode selector is out of the AUTO position, how do you set a landing elevation?

Answer 8

Turning the LDG ELEV knob to field elevation and confirming on ECAM panel.

Question 9

9) What protects the airframe from excessive cabin differential pressure?

Answer 9

Safety valves (two independent valves)

Question 10

10) How many outflow valve motors are installed?

Answer 10

Three. Two for automatic and one for manual.

Question 11

11) What happens to the pack flow rate when APU bleed air is in use or during single pack operation?

Answer 11

System provides higher flow rate

Question 12

12) When should the PACK FLOW selector not be in the normal position?

Answer 12

With less than 115 pax - LO
Hot or humid conditions - HI
Or as directed for smoke ventilation

Question 13

13) If the engine bleed air in-flight is too low what will occur?

Answer 13

Controller sends a signal to both Engine Interface Units (EIUs) to increase minimum idle and raise bleed pressure

Question 14

14) What would cause an amber FAULT light to illuminate in the PACK 1 and/ or Pack 2 pushbutton (OOD)?

Answer 14

• Pack outlet overheat
• Compressor outlet overheat
• Pack outflow valve position disagrees with selected position

Question 15

15) At what cabin differential pressure does the RAM AIR valve open?

Answer 15

Less than 1 diff

Question 16

16) What causes the Pack Flow Control valve to automatically close?

Answer 16

• Low bleed pressure
• Compressor outlet overheat
• Associated FIRE pub pressed
• DITCHING pb selected ON
• Engine start sequence

Question 17

17) What does an amber FAULT light in the HOT AIR pushbutton indicate?

Answer 17

Duct overheat (valve and trim air valves close automatically)

Question 18

18) How many Air Conditioning System Controllers are there?

Answer 18

Two

Question 19

19) Describe how the Air Conditioning System Controllers regulate temperature?

Answer 19

Modulating the bypass valve and ram air inlet of its associated pack

Question 20

20) What occurs when an active lane of an Air Conditioning System Controller fails?

Answer 20

No effect. The second takes over.

Question 21

21) What occurs when both lanes of an Air Conditioning System Controller fail?

Answer 21

Related pack is lost

Hot air and pressure regulating valve and trim air valve closes

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?

Answer 22

Closes

Question 23

23) If an air cycle machine (ACM) fails, what occurs?

Answer 23

Affected pack may be operated in heat exchanger cooling mode

Question 24

24) What effect will the engine start sequence have on the pack flow control valves?

Answer 24

Closes and doesn’t open for 60 secs to allow for start of other engine

Question 25

25) What logic controls the X-Bleed valve when the X-BLEED switch is in AUTO?

Answer 25

Valve will open and close automatically when: - APU bleed valve open, X Bleed opens - APU bleed valve closes, X Bleed closes - System detects a leak, X Bleed closes

Question 26

26) After engine start with the APU BLEED pushbutton ON, what source is supplying bleed air to the packs?

Answer 26

APU

Question 27

27) The pneumatic system is monitored and controlled by what?

Answer 27

Two Bleed Monitoring Computers (BMC1 & BMC2)

Question 28

28) If one BMC fails, can the other take over?

Answer 28

Yes

Question 29

29) What does the amber FAULT light in the APU BLEED pushbutton indicate?

Answer 29

Leak

Question 30

30) What causes the amber FAULT light on the ENG 1 BLEED and/or ENG 2 BLEED pushbutton (OOLD)?

Answer 30

- Overpressure - Overheat - Leak (wing or pylon) - Valve not closed during start or when APU bleed on

Question 31

31) What are the two functions of the engine bleed valves?

Answer 31

- Shut off | - Pressure regulating

Question 32

32) When does the Lav/Galley Extract Fan operate?

Answer 32

Continually (when electric power available)

Question 33

33) What is the purpose of the CAB FANS?

Answer 33

Recirculate and combine cold fresh air from packs and cabin air

Question 34

34) With BLOWER and EXTRACT pushbuttons in AUTO how does the system operate?

Answer 34

``` Ground - Open, skin temp 9 degrees or higher - Closed, skin temp 12 C or lower In Flight - Intermediate, skin temp 32 C or higher - Closed, skin temp. 35 C or lower ```

Question 35

35) With both BLOWER and EXTRACT pushbuttons in OVRD (smoke configuration) what are the positions of the INLET and OUTLET (EXTRACT) valves?

Answer 35

Inlet closes & outlet/extract opens

Question 36

36) What is the status of the Blower and Extract fans with the Blower and Extract pushbuttons in OVRD?

Answer 36

Blower fan stops & extract fan continues to run

Question 37

37) When is air conditioning introduced into the avionics compartment?

Answer 37

In smoke configuration (closed configuration)

Question 38

38) Is the skin heat exchanger valve ever closed in flight?

Answer 38

Yes, closed configuration

Question 39

39) What does an amber FAULT light on the BLOWER pushbutton indicate?

Answer 39

- Pressure is low - Duct overheats - Computer power supply fails - Smoke warning activated

Question 40

40) What does an amber FAULT light on the EXTRACT pushbutton indicate?

Answer 40

- Pressure low - Computer power supply fails - Smoke warning activated

Question 41

41) With 2 FAULT lights on the VENTILATION panel are there any other indications?

Answer 41

SMOKE on EMER ELEC PWR - GEN 1 pb

Question 42

42) What does the CARGO HEAT HOT AIR amber FAULT light indicate?

Answer 42

Duct overheat