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Ventilation Flashcards

1
Q

What does ventilation system include ?

A
  • The avionic
  • The batteries
  • The lavatories and galleys
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2
Q

Which computer control the avionic ventilation ?

A

Avionics Equipment Ventilation Controller (AEVC)

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3
Q

How does avionic ventilation work ?

A

It uses two electric fans to force the circulation of cooling air.

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4
Q

What are the component of Avionic Ventialation System ?

A
  • Fans
  • Skin air inlet and outlet valves
  • Skin exchange inlet and outlet bypass valves
  • Air conditioning air inlet valve
  • Skin exchange isolation valve
  • AEVC

Avionics Equipment Ventilation Controller

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5
Q

What is the function of skin air inlet and outlet valves ?

A

Admit air from outside and evacuate hot air outboard

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6
Q

What is the function of skin exchange inlet and outlet bypass valves ?

A

Enable air to circulate btw avionic bay and the space under cargo compartment floor

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7
Q

What is the function of air conditioning inlet valve ?

A

Enable the air conditioning circuit to supply air to the avionics bay

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8
Q

What is the function of skin exchange isolation valve ?

A

Connect or isolates skin heat exchanger

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9
Q

Which system control the electric fans ?

A

Fan Speed Controller (FSC) controls the ventilation fan speed as a function of temp:
- High speed when ventilation air temp > 40⁰C
- Low speed when ventilation air temp < 35⁰C

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10
Q

How many configuration are there in the avionic ventilation system ?

A
  • Open
  • Close
  • Intermediate
  • Blower fault or Extract fault
  • Smoke
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11
Q

When does OPEN configuration operate ?

A
  • A/C on ground
  • Temp > ground threshold
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12
Q

When does CLOSE configuration operate ?

A
  • A/C on ground, temp < ground threshold
  • A/C in flight, temp < in flight threshold
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13
Q

When does **INTERMEDIATE **configuration operate ?

A
  • A/C in flight
  • Temp > in flight threshold
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14
Q

What is ground threshold?

A

abv 12⁰C and increase
blw 9⁰C and decrease

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15
Q

What is in flight threshold ?

A

Abv 35℃ and increase
Blw 32℃ and decrease

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16
Q

When does Blower fault or Extract fault configuration operate ?

A

When BLOWER or EXTRACT pbs is pushed

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17
Q

When does SMOKE configuration operate ?

A
  • When BLOWER and EXTRACT pbs are pushed
  • Smoke is detected in avionic bay
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18
Q

How is air circulated in avionic ventilation system in OPEN config ?

A

Air come from outside (some from cockpit vent), then extracted overboard.

System is cooled by cool air from outside

  • Skin air inlet and outlet valves open
  • Skin exchange inlet and outlet bypass valves close
  • Air conditioning air inlet valve close
  • Skin exchange isolation valve close
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19
Q

How is air circulated in avionic ventilation system in CLOSE config ?

A

Air come from avionic bay (some from cockpit vent), some are extract through the space under cargo compartment floor.

Air is cooled via skin heat exchanger

  • Skin air inlet and outlet valves close
  • Skin exchange inlet and outlet bypass valves open
  • Air conditioning air inlet valve close
  • Skin exchange isolation valve open
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20
Q

How is air circulated in avionic ventilation system in INTERMEDIATE config ?

A

Air come from avionic bay (some from cockpit vent), circulate inside the system, some are extract through the space under cargo compartment floor and overboard.

Air is cooled via skin heat exchanger

  • Skin air inlet close and outlet valves partialy open
  • Skin exchange inlet and outlet bypass valves open
  • Air conditioning air inlet valve close
  • Skin exchange isolation valve open
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21
Q

How is air circulated in avionic ventilation system in Blower fault or Extract fault config ?

A

System is in closed circuit and air come from air conditioning system.

System is cooled by conditioning air

  • Skin air inlet and outlet valves close
  • Skin exchange inlet and outlet bypass valves close
  • Air conditioning air inlet valve open
  • Skin exchange isolation valve open
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22
Q

How is air circulated in avionic ventilation system in SMOKE config ?

A

Air come from air conditioning system and vented overboard

System is cooled by conditioning air

  • Skin air inlet close and outlet valves partialy open
  • Skin exchange inlet and outlet bypass valves close
  • Air conditioning air inlet valve open
  • Skin exchange isolation valve close
23
Q

What happen when BLOWER pb set to OVRD ?

A
  • Blower fan stop, exctract fan run
  • System switch to Blower fault config
24
Q

What happen when EXTRACT pb set to OVRD ?

A
  • Extract fan and Blower fan both run
  • System switch to Extract fault config
25
How can the system alert the crew, if there is smoke in avionic bay ?
* **Fault** light on Blower and Extract pb illuminate * **SMOKE** lt on GEN 1 LINE pb illuminate * ECAM alert mess
26
Which light illuminate when there is a controller failure ? | Avionic ventilation system
**FAULT** lt of BLOWER and EXTRACT pbs
27
What to do when there is a controller failure ? | Avionic ventilation system
Set both Blower and Extract to **OVRD**
28
What happen when **EXTRACT** pb and **BLOWER** pb set to **OVRD** ?
* Blower fan stop, exctract fan run * System is the same as smoke config except skin air inlet valve, skin exchange inlet valve and skin exchange isolation valve open
29
What happen when **EXTRACT** pb and **BLOWER** pb set to **OVRD** and smoke is detected in avionic bay ?
* Blower fan stop, exctract fan run * System switch into smoke config
30
How are batteries ventilated ?
A venturi in the skin of a/c draws air from the space around the batteries and vent it outboard
31
How are lavatories and galleys ventilated ?
An extraction fan drawn ambiet cabin air through lavatories and galleys and exhausts it near the outflow valve
32
How can you turn on the **extraction fan** of lavatories and galleys ventilations system ?
it runs continually when elec power avail
33
**FAULT** lt on **BLOWER** pb ?
* Blowing pressure is low * computer power supply fails * smoke warning * duct overheats
34
**FAULT** lt on **EXTRACT** pb ?
* Extract pressure is low * computer power supply fails * smoke warning
35
When a/c on ground with engines shut down, and **blower** or **extract** pressure is low, what will happen ?
An external horn will sound
36
How are the **FWD** cargo compartment ventilated ?
The air come from cabin and is exhausted outboard via an extraction fan or by differiential pressure
37
What are the component of **AFT** and **FWD** cargo compartment ventilation system ?
* An extraction fan * Inlet and outlet isolation valves * Cargo ventilation controller
38
How are the **AFT** cargo compartment ventilated ?
The air come from cabin and is exhausted outboard via an extraction fan
39
When will the controller closes the isolation valves and stops extraction fan ? | cargo ventilation
* Set (AFT/FWD) ISOL VALVE pb OFF * Smoke detected
40
What happen when **AFT** or **FWD ISOL VALVE** pb set to **OFF** ?
* Isolation valves are closed * Extraction Fan stop
41
When will extraction fan of **FWD** cargo stop running ?
* When a/c inflight and ΔP>1 * FWD ISOL VALVE pb OFF * Smoke detected * DITCHING pb pushed
42
When will extraction fan of **AFT** cargo stop running ?
* AFT ISOL VALVE pb OFF * Smoke detected
43
How can cargo temp be regulated ?
System mix hot bleed air with the air from cabin. | The amount of hot air is control by trim air valve.
44
What will happen when inlet temp reach * 70℃ * 88℃ | Cargo ventilation system
* 70℃ trim air valve close * 88℃ pressure regulating valve close
45
HOT AIR pb | On **CARGO HEAT** panel * OFF * FAULT
* OFF: Pressure regulating valve and trim air valve close * FAULT: duct overheat (T°>88℃), light goes out when T°<70℃ and OFF is selected
46
Can the crew reset system when duct over heat ? | Cargo ventilation system
Yes, reset by pressing **HOT AIR** pb, when temp < 70℃
47
**FAULT** lt on AFT/FWD ISOL VALVE ?
Come on amber when either inlet or outlet valve is not in selected position
48
Cargo temperature selector * Hot * Middle | * Cold
* Cold: 5℃ * Hot: 26℃ * Middle: 15℃
49
With **BLOWER** and **EXTRACTOR** pb in **AUTO**, what ventilation system's config do you expect to see ?
* OPEN * CLOSE * INTERMEDIATE
50
On which ECAM page you will get the information abt ventilation system ?
PRESS page
51
On which ECAM page you will get the information abt cargo heating system ?
COND page
52
During the ground function operation, the outflow valve is ...
Fully open
53
With both **BLOWER** and **EXTRACTOR** in **OVRD**, what are the position for the **skin air inlet** and **outlet valve** ? | SMOKE config
* Skin air inlet valve close * Skin air outlet valve partialy open
54
With cargo smoke waring, what happen to the isolation valve and extract fan ?
* Isolation valve close * Fan stop

A321 (26 decks)

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