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A321 > Ventilation > Flashcards

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
Q

How can the system alert the crew, if there is smoke in avionic bay ?

A
  • Fault light on Blower and Extract pb illuminate
  • SMOKE lt on GEN 1 LINE pb illuminate
  • ECAM alert mess
26
Q

Which light illuminate when there is a controller failure ?

Avionic ventilation system

A

FAULT lt of BLOWER and EXTRACT pbs

27
Q

What to do when there is a controller failure ?

Avionic ventilation system

A

Set both Blower and Extract to OVRD

28
Q

What happen when EXTRACT pb and BLOWER pb set to OVRD ?

A
  • 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
Q

What happen when EXTRACT pb and BLOWER pb set to OVRD and smoke is detected in avionic bay ?

A
  • Blower fan stop, exctract fan run
  • System switch into smoke config
30
Q

How are batteries ventilated ?

A

A venturi in the skin of a/c draws air from the space around the batteries and vent it outboard

31
Q

How are lavatories and galleys ventilated ?

A

An extraction fan drawn ambiet cabin air through lavatories and galleys and exhausts it near the outflow valve

32
Q

How can you turn on the extraction fan of lavatories and galleys ventilations system ?

A

it runs continually when elec power avail

33
Q

FAULT lt on BLOWER pb ?

A
  • Blowing pressure is low
  • computer power supply fails
  • smoke warning
  • duct overheats
34
Q

FAULT lt on EXTRACT pb ?

A
  • Extract pressure is low
  • computer power supply fails
  • smoke warning
35
Q

When a/c on ground with engines shut down, and blower or extract pressure is low, what will happen ?

A

An external horn will sound

36
Q

How are the FWD cargo compartment ventilated ?

A

The air come from cabin and is exhausted outboard via an extraction fan or by differiential pressure

37
Q

What are the component of AFT and FWD cargo compartment ventilation system ?

A
  • An extraction fan
  • Inlet and outlet isolation valves
  • Cargo ventilation controller
38
Q

How are the AFT cargo compartment ventilated ?

A

The air come from cabin and is exhausted outboard via an extraction fan

39
Q

When will the controller closes the isolation valves and stops extraction fan ?

cargo ventilation

A
  • Set (AFT/FWD) ISOL VALVE pb OFF
  • Smoke detected
40
Q

What happen when AFT or FWD ISOL VALVE pb set to OFF ?

A
  • Isolation valves are closed
  • Extraction Fan stop
41
Q

When will extraction fan of FWD cargo stop running ?

A
  • When a/c inflight and ΔP>1
  • FWD ISOL VALVE pb OFF
  • Smoke detected
  • DITCHING pb pushed
42
Q

When will extraction fan of AFT cargo stop running ?

A
  • AFT ISOL VALVE pb OFF
  • Smoke detected
43
Q

How can cargo temp be regulated ?

A

System mix hot bleed air with the air from cabin.

The amount of hot air is control by trim air valve.

44
Q

What will happen when inlet temp reach
* 70℃
* 88℃

Cargo ventilation system

A
  • 70℃ trim air valve close
  • 88℃ pressure regulating valve close
45
Q

HOT AIR pb

On CARGO HEAT panel
* OFF
* FAULT

A
  • 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
Q

Can the crew reset system when duct over heat ?

Cargo ventilation system

A

Yes, reset by pressing HOT AIR pb, when temp < 70℃

47
Q

FAULT lt on AFT/FWD ISOL VALVE ?

A

Come on amber when either inlet or outlet valve is not in selected position

48
Q

Cargo temperature selector

  • Hot
  • Middle

* Cold

A
  • Cold: 5℃
  • Hot: 26℃
  • Middle: 15℃
49
Q

With BLOWER and EXTRACTOR pb in AUTO, what ventilation system’s config do you expect to see ?

A
  • OPEN
  • CLOSE
  • INTERMEDIATE
50
Q

On which ECAM page you will get the information abt ventilation system ?

A

PRESS page

51
Q

On which ECAM page you will get the information abt cargo heating system ?

A

COND page

52
Q

During the ground function operation, the outflow valve is …

A

Fully open

53
Q

With both BLOWER and EXTRACTOR in OVRD, what are the position for the skin air inlet and outlet valve ?

SMOKE config

A
  • Skin air inlet valve close
  • Skin air outlet valve partialy open
54
Q

With cargo smoke waring, what happen to the isolation valve and extract fan ?

A
  • Isolation valve close
  • Fan stop

A321 (25 decks)

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