Air Conditioning/ Pressurization/ Ventilation/ Pneumatic

Question 1

What are the functions of each position of the X Bleed Selector

Answer 1

1) SHUT - Commands X-Bleed Valve Closed overriding system logic

2) AUTO - Auto Logic of the X-Bleed Valve

3) Open - Commands X Bleed Valve Open, overriding system logic

Question 2

When does Auto logic control the opening and closing of the X-Bleed Valve

Answer 2

1) Commanded Open when the APU bleed valve is open

2) Commanded Closed when the APU bleed valve is closed

3) Commanded Closed when a bleed leak is detected

Question 3

What are the indications that external high pressure air is being applied to the pneumatic system

Answer 3

If there is no internal air source provided (ie APU or Engine bleed air), a PSI value is displayed on the left side of the ECAM BLEED page. By default the air source must be an external high pressure air cart.

Question 4

What are the indications of the Engine Bleed Valves and HP (High Pressure) valves on the ECAM BLEED Page

Answer 4

1) Engine Bleed Valves are next to the respective engine’s ( 1 and 2) on lower portion of the page

2) HP Valves are on the lower portion next to the white HP designator

Question 5

Are the IP (Intermediate Pressure) check valves specifically depicted? How are they represented?

Answer 5

Not specifically depicted, but designated by a white IP designator

Question 6

What are the indications when APU bleed air is in use?

Answer 6

1) APU Bleed valve indicates open (vertical green line) on the ECAM BLEED page

2) APU BLEED is displayed in green on the memo section of the E/WD

Question 7

What areas of the aircraft can a bleed air leak be detected?

Answer 7

1) Wings - each wing bleed air duct

2) Engine Pylon - area from the engine to the respective wing bleed duct

3) Aft fuselage - area surrounding the APU bleed air duct

Question 8

What happens if the primary channel of the Zone Controller fails?

Answer 8

1) ALTN MODE appears at the top of the ECAM COND page

   - The secondary channel operates as a backup 
   - Flow setting function and optimized temp function are not available 
   - HOT AIR and TRIM AIR valves close

Question 9

What happens if only the secondary channel of the Zone Controller fails?

Answer 9

1) There is no effect on Zone Temp Regulation (still have primary)

2) Backup mode and Temp indications will be lost

Question 10

What happens if both the Primary and Secondary channels of the Zone Controllers fail

Answer 10

1) PACK REG appears at the top of the ECAM COND page

 - All information from the ECAM COND page is removed 

- Optimized and backup temp regulation is lost 

 - Packs deliver a fixed temp.

Question 11

What is the effect of an AC Pack Controller Primary Channel Failure

Answer 11

1) Secondary operates as a backup

2) Pack flow is fixed at the previous setting

Question 12

What is the effect of an AC Pack Controller Secondary channel failure

Answer 12

1) Has no effect on pack flow regulation, but backup mode is lost

2) ECAM indications relating to corresponding pack are lost

Question 13

What is the effect if both Primary and Secondary channels of an AC Pack Controller fail?

Answer 13

• Pack outlet temp is controlled and stabilized by the anti-ice valve and
• ECAM indications related to the pack are lost

Question 14

Which cargo compartment is heated and ventilated, where are the controls located, and how is temp monitored?

Answer 14

1) Aft
2) Overhead Cargo Heat panel
3) Monitored on the ECAM COND or CRUISE pages

Question 15

How many Cabin Pressure Controllers (CPCs) are installed, how are they designated and where is the active system displayed?

Answer 15

1) Two CPCs installed
2) Designated as SYS1 and SYS2
3) Active system viewed on the ECAM CAB PRESS page

Question 16

How do the active and standby CPCs switch roles?

Answer 16

1) Automatically - shortly after each landing and in the event the active CPC fails

2) Manually - placing the MODE SEL pb to MAN for 10 seconds and then returning back to AUTO (lights out) mode

Question 17

How does the LDG ELEV selector function in the AUTO (detent) position?

Answer 17

FMGCs provide the pressurization system with the LFE.

Question 18

How does the LDG ELEV selector function in any other position other than AUTO (turned clockwise). When would you use this?

Answer 18

1) LFE is set manually
2) Used when both FMGCs have failed or if landing airport is not in the FMS data base

Question 19

What does the MODE SEL pb do?

Answer 19

1) Deactivates AUTO pressurization mode

2) When selected (light on) enables the use of MAN V/S CTL toggle switch to manually control the outflow valve

Question 20

What are the functions of the MAN V/S toggle switch?

Answer 20

UP - commands outflow valve open, reduces pressure “takes cabin up”

DOWN - commands outflow valve closed, increases cabin pressure “takes cabin down”

Question 21

How can the pressurization system performance be monitored

Answer 21

ECAM CAB PRESS or Cruise page

Question 22

If the flight must return to the departure airport immediately after takeoff, what actions must be taken by the the crew with regard to the pressurization system? Why?

Answer 22

No action is required because the system will automatically return the cabin to match the takeoff altitude (Abort MODE).

Question 23

What will happen if you place the DITCHING pb to the ON position

Answer 23

The following openings will close

• Outflow valve (if the MODE SEL pb is AUTO)
• Ram Air Inlet
• Avionics Ventilation Inlet and Extract valves
• Pack flow control valves

Question 24

How will you know if smoke is detected in the avionics compartment? How do you configure the aircraft in the event of AVIONICS SMOKE

Answer 24

1) FAULT will appear on the BLOWER and EXTRACT pb

2) Place the BLOWER and EXTRACT pbs to OVRD (white) which will”

   - Allow additional air from the AC system to enter the compartment 
  - force all air inside the compartment overboard