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Allegiant Airbus 320 > Air Conditiong/Ventilation/Pressurization > Flashcards

Air Conditiong/Ventilation/Pressurization Flashcards

1
Q

What computers monitor and control the pneumatic system?

A

2 Bleed Monitoring Computers (BMC)

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2
Q

If one BMC fails, can the other take over?

A

Yes

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3
Q

The PACK FLOW selector has LO, NORM, and HI positions. What is the rule of thumb for setting?

A

LO: Occupants below 138

HI: For abnormally hot and humid conditions

NORM: For all other operating cases

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4
Q

What modulates the trim air valves?

A

The zone regulator adjusts the trim air valves and pack outlet temps to optimize the zone temps

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5
Q

How are the Pack Control Valves controlled and regulated?

A

Pneumatically operates and electrically controlled by the pack controller

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6
Q

What is the purpose of the Emergency Ram Air Inlet?

A
  • cabin ventilation in case both packs are inop

- clear smoke out of the cabin

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7
Q

What happens when the RAM AIR pb is selected to ON?

A
  • ram air valve opens, and
  • outflow valve will fully open when cabin differential pressure is less than 1 psi (as long as the cabin MODE SEL pb is in AUTO)
  • the emergency ram air inlet and outflow valve will not open if ditching has been selected
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8
Q

What do the Pack Flow Control Valves do?

A
  • regulate amount of bleed air supplied to the packs

- function as shut off valves

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9
Q

When will a Pack Flow Control Valve automatically close?

A
  • during engine start
  • upstream pressure below min
  • pack overheat
  • pressing an ENG FIRE pb
  • ditching pb selected ON
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10
Q

What does the the Hot Air Valve do?

A

Controls supply of hot bleed air to all 3 Trim Air Valves

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11
Q

What do the Trim Air Valves do?

A

Add hot air to airflow from mixing unit to maintain selected zone temperatures

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12
Q

How are the Trim Air Valves controlled?

A

Electrically by the zone controller

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13
Q

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

A
  • Hot Air valves close
  • Trim Air valves close
  • Lose flow function
  • Lose optimized temperature
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14
Q

What would cause an amber PACK FAULT light to illuminate?

A
  • Pack overheat

- Switch position disagreement with pack FCV

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15
Q

What does the amber FAULT light in the APU BLEED pb indicate?

A

Bleed leak

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16
Q

What causes the amber FAULT light on the ENG BLEED pb?

A

LOOSA

  • Leak
  • Overpressure downstream
  • Overheat
  • Starting engine and valve not closed
  • APU bleed on and valve not closed
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17
Q

What happens if both the primary and secondary channels of the Zone Controller fail?

A
  • optimized and back-up temp regulation is lost
  • Pack 1 delivers a fixed temp of 68* F
  • Pack 2 delivers a fixed temp of 50* F
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18
Q

What logic controls the X-BLEED valve when the X-BLEED switch is in AUTO?

A
  • When APU BLEED valve is OPEN, the X-BLEED valve is open

- When the APU BLEED valve is CLOSED, the X-BLEED valve is closed

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19
Q

What is the function of the HOT AIR pb?

A
  • The HOT AIR valve controls the supply of the hot air to all of the trim air valves which maintain the selected temperature in each zone
  • Valve position is controlled by the HOT AIR pb. The valve automatically closes in the event of a fault
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20
Q

What does the amber HOT AIR FAULT light indicate?

A

Duct overheat; the HOT AIR valve closes automatically

21
Q

How does the system optimize the temperature in each of the three zones?

A
  • Trim air valves
  • To maintain the selected zone temperature, the trim air valves under control of the zone regulator, add hot air, if necessary, to the air flowing from the mixing unit
  • This allows the air temp to be controlled independently in each zone
22
Q

What effect will the engine start sequence have on the pack flow control valves?

A

The pack flow control valve will close automatically

23
Q

After engine start with the APU BLEED pb ON, what source is supplying bleed air to the packs?

A

APU Bleed

24
Q

What does the DITCHING pb do?

A

Closes all the valves below the waterline: CARPO

  • Cargo compartment isolation valves*
  • Avionics ventilation (inlet/extract valves)
  • Ram air inlet
  • Pack FCVs
  • Outflow valve (if in AUTO)

*only forward cargo valves close; aft cargo valves duct out of outflow valve

25
Q

With the BLOWER and EXTRACT pb’s in AUTO how does the system typically operate?

A
  • Ground: system is in OPEN config
  • Flight: system is in CLOSED config
  • Intermediate: closed except extract valve is partially open
26
Q

With the BLOWER and EXTRACT pb’s in OVRD, what are the positions of the INLET and EXTRACT valves?

A

Smoke configuration:

  • INLET valve closed
  • EXTRACT valve open
  • A/C is introduced into the avionics compartment
27
Q

Which fan is off when the BLOWER and EXTRACT valves are in OVRD?

A
  • BLOWER fan is off

- EXTRACT fan is on

28
Q

Is air conditioning ever introduced into the avionics compartment?

A

Yes, in the smoke config or abnormal config

29
Q

What does the FAULT light on the BLOWER pb indicate?

A
  • SMOKE warning is activated
  • Computer failure
  • Low blower pressure
  • Duct overheat
30
Q

What does the FAULT light on the EXTRACT pb indicate?

A
  • SMOKE warning is activated
  • Computer failure
  • Low extract pressure
31
Q

With 2 FAULT lights on the VENTILATION panel are there any other indications?

A

Yes, the SMOKE light in the GEN 1 LINE pb

32
Q

When do the cabin oxygen mask doors automatically open?

A

When the cabin altitude exceeds 14,000 feet

33
Q

Can you manually deploy the masks?

A

Yes, lift the guard and press the MASK MAN ON pb

34
Q

What does the PASSENGER SYS ON light mean?

A

The signal to release the oxygen mask doors has been sent either automatically or manually

35
Q

What method is used to supply passenger cabin supplemental oxygen?

A

Chemical generators

36
Q

How long does the PAX oxygen last?

A

Approximately 15 minutes

37
Q

Where is oxygen stored for the crew?

A

In a single high-pressure cylinder

38
Q

What happens during the preflight when you push to extinguish the CREW SUPPLY OFF pb?

A

It opens a valve in the avionics bag to supply low-pressure crew oxygen

39
Q

What would you notice on the DOOR ECAM when turning on the crew oxygen?

A

The OXY would change from amber to green

40
Q

On the ground, what does an amber half frame under the pressure mean?

A

Pressure is less than 1500 psi

41
Q

How do you deactivate the crew oxygen mask microphone after use?

A

Close the left door and press the PRESS TO TEST AND RESET switch

42
Q

Where do you find the minimum flight crew O2 values?

A

FCOM LIM-35

43
Q

Can the pilot control the outflow valve?

A

Yes, select MAN on the MODE SEL and use MAN V/S CTL switch

44
Q

How many auto pressure controllers?

A

2
Only one controller operates at a time and automatic transfer occurs:
-70s after each landing
-If the operating system fails

45
Q

How do you manually switch controllers?

A

Switch MODE SEL to MAN for 10 sec, then back to AUTO

46
Q

What does an amber FAULT light in the MODE SEL pb indicate?

A

Both automatic pressure controllers are faulty

47
Q

The LDG ELEV selector in the AUTO position does what?

A

The pressurization system uses the FMGS data to construct an optimized pressurization schedule

48
Q

Where does the pressurization system obtain the landing elevation from?

A

FMGC Database

49
Q

When out of the AUTO position, what is different?

A

The pressurization system uses the manually selected landing elevation

Allegiant Airbus 320 (18 decks)

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