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

Air Conditiong/Ventilation/Pressurization Flashcards

(49 cards)

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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?

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A

Duct overheat; the HOT AIR valve closes automatically

21
Q

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

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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?

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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?

24
Q

What does the DITCHING pb do?

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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
With the BLOWER and EXTRACT pb’s in AUTO how does the system typically operate?
- Ground: system is in OPEN config - Flight: system is in CLOSED config - Intermediate: closed except extract valve is partially open
26
With the BLOWER and EXTRACT pb’s in OVRD, what are the positions of the INLET and EXTRACT valves?
Smoke configuration: - INLET valve closed - EXTRACT valve open * A/C is introduced into the avionics compartment
27
Which fan is off when the BLOWER and EXTRACT valves are in OVRD?
- BLOWER fan is off | - EXTRACT fan is on
28
Is air conditioning ever introduced into the avionics compartment?
Yes, in the smoke config or abnormal config
29
What does the FAULT light on the BLOWER pb indicate?
- SMOKE warning is activated - Computer failure - Low blower pressure - Duct overheat
30
What does the FAULT light on the EXTRACT pb indicate?
- SMOKE warning is activated - Computer failure - Low extract pressure
31
With 2 FAULT lights on the VENTILATION panel are there any other indications?
Yes, the SMOKE light in the GEN 1 LINE pb
32
When do the cabin oxygen mask doors automatically open?
When the cabin altitude exceeds 14,000 feet
33
Can you manually deploy the masks?
Yes, lift the guard and press the MASK MAN ON pb
34
What does the PASSENGER SYS ON light mean?
The signal to release the oxygen mask doors has been sent either automatically or manually
35
What method is used to supply passenger cabin supplemental oxygen?
Chemical generators
36
How long does the PAX oxygen last?
Approximately 15 minutes
37
Where is oxygen stored for the crew?
In a single high-pressure cylinder
38
What happens during the preflight when you push to extinguish the CREW SUPPLY OFF pb?
It opens a valve in the avionics bag to supply low-pressure crew oxygen
39
What would you notice on the DOOR ECAM when turning on the crew oxygen?
The OXY would change from amber to green
40
On the ground, what does an amber half frame under the pressure mean?
Pressure is less than 1500 psi
41
How do you deactivate the crew oxygen mask microphone after use?
Close the left door and press the PRESS TO TEST AND RESET switch
42
Where do you find the minimum flight crew O2 values?
FCOM LIM-35
43
Can the pilot control the outflow valve?
Yes, select MAN on the MODE SEL and use MAN V/S CTL switch
44
How many auto pressure controllers?
2 Only one controller operates at a time and automatic transfer occurs: -70s after each landing -If the operating system fails
45
How do you manually switch controllers?
Switch MODE SEL to MAN for 10 sec, then back to AUTO
46
What does an amber FAULT light in the MODE SEL pb indicate?
Both automatic pressure controllers are faulty
47
The LDG ELEV selector in the AUTO position does what?
The pressurization system uses the FMGS data to construct an optimized pressurization schedule
48
Where does the pressurization system obtain the landing elevation from?
FMGC Database
49
When out of the AUTO position, what is different?
The pressurization system uses the manually selected landing elevation

Allegiant Airbus 320 (18 decks)

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