VENTILATION

Question 1

What 3 separate ventilation systems does the A320 have?

Answer 1

• Avionics Ventilation
• Battery Ventilation
• Lavatory and Galley Ventilation

Question 2

How does the ventilation smoke configuration work?

Answer 2

When smoke is detected in the avionics bay, the BLOWER and EXTRACTOR FAULT lights comes on. When both the BLOWER and EXTRACT pb are set to OVRD, the Aircon Inlet Valve opens. The BLOWER stops but the EXTRACTOR continues operation

Question 3

With the BLOWER and EXTRACT pb switches in AUTO, what ventilation configuration can you normally expect to see?

Answer 3

Open circuit config on the ground before applying T/O power and closed config after applying T/O power

Question 4

How does the battery ventilation work?

Answer 4

A venturi in the skin of the aircraft draws air from the space around the batteries and vents is overboard.
Works as long as there’s electrical power

Question 5

On which ECAM page will you find information about the status of the ventilation system?

Answer 5

PRESS page

Question 6

With the BLOWER and EXTRACTOR pb switches in OVRD, what happens to the ventilation system?

Answer 6

It goes into the smoke configuration and the BLOWER fan stops. Aircon Inlet Valve opens and the EXCTRACTOR fan keeps operating

Question 7

When does the Open Circuit Ventilation configuration operate on the ground?

Answer 7

When the skin temperature is above the on ground threshold.
+12 deg C temperature increasing or
+9 deg C temperature decreasing

Question 8

What is the ventilation system controlled by?

Answer 8

The AEVC (Avionics Equipment Ventilation Computer)

Question 9

What could a FAULT light in the BLOWER pb indicate?

Answer 9

• Smoke warning is activated
• Computer power supply failure
• Low BLOWER pressure
• Duct overheat

Question 10

What could an amber FAULT light in the EXTRACTOR pb indicate?

Answer 10

• Smoke warning is activated
• Computer power supply failure
• Low extract pressure

Question 11

With 2 FAULT lights on the Ventilation panel, are there any other indications of smoke in the system?

Answer 11

Yes, the SMOKE light in the GEN 1 LINE pb

Question 12

What three configurations can the ventilation system operate in?

Answer 12

-Open Circuit: On the ground

-Closed circuit: In flight after T/O power is set

-Intermediate: In air with skin temp over +35 deg C and increasing or +32 deg C decreasing, a small flap is opened in the extractor valve

Question 13

With both BLOWER and EXTRACT pb in OVRD (smoke config) what are the positions of the INLET and EXTRACT valves?

Answer 13

INLET valve is closed
EXTRACT valve is partially open

Question 14

With a FAULT light in both Ventilation pb switches, what happens to the Skin Exch Isol Valve and the blower and extract fans when they are both set to OVRD?

Answer 14

Isolation valve closes
Blower fan stops and Extraction fan continues to run

Question 15

What does the CARGO HEAT AFT ISOL VALVE amber FAULT light indicate?

Answer 15

Valve disagreement of inlet and outlet valve

Question 16

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

Answer 16

Duct overheat

Question 17

Why would the EXTRACT or INLET valves be amber on the ground?

Answer 17

Position disagreement
Valves are in transit
Skin temp is between 9-12 deg C

Question 18

What can be the possible bad side effect from being in smoke configuration in-flight?

Answer 18

Extract valve is open and can compromise pressurization

Question 19

In the “Ground mode” at low skin temperatures, how is the circulatory air now cooled?

Answer 19

In closed circuit config when skin temp is below the on-ground threshold

Question 20

In the “In-flight Mode” at high skin temp which configuration is in operation? What is the definition of “high”?

Answer 20

The intermediate config operates if skin temp is above +35 deg C

Question 21

What happens when the BLOWER is selected to OVRD?

Answer 21

The system goes into closed circuit config and air from the aircon system is added to ventilate air

Question 22

How can the cockpit be ventilated from smoke?

Answer 22

By using the RAM AIR pb

Question 23

When is air conditioning introduced into the avionics compartments?

Answer 23

Abnormal operation and SMOKE configuration

Question 24

What is the purpose of the avionics ventilation system?

Answer 24

Cools the electrical components in the avionics compartment and on the flight deck it cools instrument and circuit breaker panels

Question 25

When does the LAV/GALLEY extract fans operate?

Answer 25

Continously when electrical power is available

Question 26

Is the skin heat exchanger ever bypassed in flight?

Answer 26

Yes, during SMOKE configuration

Question 27

What is the temperature range on the Cargo Heat Temperature selector?

Answer 27

Cold 5 deg C
Hot 26 deg C
Middle 15 deg C

Question 28

Describe the components of the cargo ventilation/heating system

Answer 28

Question 29

How does the Lavatory/Galley ventilation work?

Answer 29

Question 30

At what temperature will the Cargo Heating Controller automatically close the Hot Air Trim Valve?

Answer 30

At 70 deg C and above

Question 31

Above what temperature will the Cargo Heating Controller close the Cargo Press Reg Valve?

Answer 31

At 88 deg C or above inlet temp