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A320 Systems > Ventilation > Flashcards

Ventilation Flashcards

1
Q

The avionics ventilation system is fully automatic.

True or false?

A

True

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2
Q

How many fans are used to circulate air around the avionics equipment?

A

Two (2) electric fans continuously circulating air around the avionics equipment when the aircraft is electronically supplied.

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3
Q

The avionics ventilation system cools the electrical and electronic components in which areas?

A

The avionics compartment and on the flight deck, including the instrument and circuit breaker panels.

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4
Q

Name the two (2) fans that force circulation of cool air around the avionics ventilation system:

A
  • Blower fan

- Extract fan

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5
Q

These valves admit air from the outside of the aircraft and evacuate hot air from the avionics equipment.

A

Skin air inlet and outlet valves

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6
Q

The A320 ventilation system provides ventilation for the following areas:

A
  • Avionics (controlled by AEVC Avionics Equipment Ventilation Controller)
  • The batteries
  • The lavatories and galleys
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7
Q

These valves enable air to circulate between the avionics bay and the space under the cargo compartment floor:

A

Skin exchange inlet and outlet bypass valves

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8
Q

This valve opens to enable the airconditioning circuit to supply fresh air to the avionics bay:

A

Airconditioning inlet valve

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9
Q

This valve connects or isolates the skin heat exchanger:

A

Skin exchange isolation valve

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9
Q

This computer controls the operation of all fans and valves in the avionics ventilation system:

A

Avionics Equipment Ventilation Computer (AEVC)

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10
Q

What are the three (3) avionics ventilation system configurations during normal operations?

A
  • Open-circuit configuration
  • Closed-circuit configuration
  • Intermediate configuration
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11
Q

The _______ configuration operates when skin temperature is above the on-ground threshold, the aircraft is on ground and thrust levers are not at take-off. Both skin air inlet and outlet valves are open.

A

Open-circuit configuration

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12
Q

What is the skin temperature on-ground threshold?

A

+12 °C (53 °F), temperature increasing, or

+9 °C (48 °F), temperature decreasing.

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13
Q

What is the skin temperature in-flight threshold?

A

+35 °C (95 °F), temperature increasing, or

+32 °C (90 °F), temperature decreasing.

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14
Q

The open-circuit configuration operates when:

A
  • The skin air temperature is above the on-ground threshold
  • On ground
  • Thrust levers not at TO
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15
Q

What is the normal operation configuration of the avionics ventilation system when it is on ground (before applying TO power) and skin temperature is above the on-ground threshold?

A
  • Open-circuit configuration
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16
Q

What is the normal operation configuration of the avionics ventilation system when it is on ground (before applying TO power) and skin temperature is beneath the on-ground threshold?

A
  • Closed-circuit configuration
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17
Q

What is the normal operation configuration of the avionics ventilation system when it is in-flight and skin temperature is beneath the in-flight threshold?

A
  • Closed-circuit configuration
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18
Q

What is the normal operation configuration of the avionics ventilation system when it is in-flight and skin temperature is above the in-flight threshold?

A
  • Intermediate configuration
19
Q

The open-circuit configuration operates when the skin air temperature is ________ the on-ground threshold.

A

Above

[+12 °C (53 °F), temperature increasing, or
+9 °C (48 °F), temperature decreasing.]

20
Q

During on-ground operations:

The closed-circuit configuration operates when the skin air temperature is ________ the on-ground threshold.

A

Beneath

[+12 °C (53 °F), temperature increasing, or
+9 °C (48 °F), temperature decreasing.]

21
Q

During flight operations:

The closed-circuit configuration operates when the skin air temperature is ________ the in-flight threshold.

A

Beneath

[+35 °C (95 °F), temperature increasing, or
+32 °C (90 °F), temperature decreasing.]

22
Q

The avionics ventilation system is in a ________ configuration when the skin temperature is below the in-flight threshold, the aircraft is on the ground and the thrust levers are at TO. Both skin air inlet and outlet valves are closed. Both blower and extract fans are operating.

A

Closed circuit configuration (Take-off to in-flight when skin temperature is beneath the in-flight threshold)

23
Q

The avionics ventilation system is in a ________ configuration when the skin temperature is below the on-ground threshold, the aircraft is on the ground and the thrust levers are not at TO. Both skin air inlet and outlet valves are closed. Both blower and extract fans are operating.

A

Closed-circuit configuration (On-ground)

24
Q

The avionics ventilation system is in a _______ configuration when the skin temperature is below the in-flight threshold, the aircraft is in-flight and the thrust levers are at TO. Both skin air inlet and outlet valves are closed. Both blower and extract fans are operating.

A

Closed circuit configuration (In-flight when skin temperature is beneath the in-flight threshold)

25
Q

The avionics ventilation system is in an ________ configuration when the skin temperature is above the in-flight threshold and the aircraft is in-flight. The skin air inlet valve is closed and outlet valve is partially open. Both blower and extract fans are operating.

A

Intermediate configuration (In-flight)

26
Q

The avionics ventilation system is in an _________ configuration when the skin temperature is above the in-flight threshold, the aircraft is on ground and thrust levers are at TO. The skin air inlet valve is closed and outlet valve is partially open. Both blower and extract fans are operating.

A

Intermediate-circuit configuration (During take-off)

27
Q

What are the three (3) abnormal avionics system configurations?

A
  • Blower fault or extract fault (Closed-circuit configuration)
  • Smoke configuration
  • Controller failure
28
Q

The intermediate-circuit configuration operates when the skin air temperature is ________ the in-flight threshold.

A

Above

[+35 °C (95 °F), temperature increasing, or
+32 °C (90 °F), temperature decreasing.]

29
Q

What is the position of the skin air inlet valve and skin air outlet valve during an intermediate configuration?

A

Skin air inlet valve - CLOSED
Skin air outlet valve - Partly OPEN

Both blower and extract fans operating.

30
Q

During abnormal operations (Blower or Extract fault), when the BLOWER or EXTRACT pb switch is set at the OVRD position, the system is in the _________configuration, and adds air from the _________ system to the ventilation air.

A
  • Closed-circuit configuration

- Air conditioning system

31
Q

When the BLOWER pb switch is set to OVRD, the blower fan is ______ and the extract fan _______.

A
  • stopped

- continues to run

32
Q

When the EXTRACT pushbutton switch is set at OVRD, the extract fan is ________. Both fans ________.

A
  • controlled directly from the pushbutton

- continue to run

33
Q

What happens when the smoke detector detects smoke in the avionics ventilation air?

A

The BLOWER and the EXTRACT FAULT lights come on.

34
Q

When both the BLOWER and the EXTRACT pushbuttons are set to the OVRD position, the _______ supplies cooling air, which is then ________. The blower fan ______.

A
  • Air conditioning system
  • exhausted overboard
  • stops
35
Q

During a Controller failure the system goes into a smoke configuration, except that the skin exchange isolation valve stays open. True or False?

A

True

36
Q

What happens during a Controller failure?

A

The system goes into a smoke configuration, except that the skin exchange isolation valve stays open. The inlet valve and the skin exchange inlet bypass valve remain in the position they were in before the failure occurred. The extract fan keeps running.

37
Q

How are the batteries ventilated?

A

A venturi in the skin of the aircraft draws air from the space around the batteries and vents it overboard. The resulting airflow ventilates the batteries.

38
Q

How are the lavatories and galley ventilated?

A

An extraction fan draws ambient cabin air through the lavatories and galleys and exhausts it near the outflow valve.

The extraction fan runs continually when electric power is available.

39
Q

How many cabin fans are there?

A

Two (2)

40
Q

The BLOWER fault light (amber) comes on (and ECAM activates) when:

A
  • blowing pressure is low
  • duct overheats
  • computer power supply fails
  • smoke warning is activated
41
Q

The EXTRACT fault light (amber) comes up (and ECAM activates) when:

A
  • extract pressure is low
  • computer power supply fails
  • smoke warning is activated.
42
Q

What happens when the BLOWER or EXTRACT warning (blowing or extract pressure low) occurs on ground with engines stopped?

A

The external horn sounds

43
Q

What does the air conditioning inlet valve do?

A

Opens to enable the air conditioning system to supply fresh air to the avionics bay.

44
Q

When is air conditioning introduced into the avionics compartment?

A

When either BLOWER or EXTRACT switches are on OVRD. Usually during:

  • Smoke configuration
  • Abnormal configuration

A320 Systems (3 decks)

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