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ASA FH 01/13/21 > Air Systems > Flashcards

Air Systems Flashcards

1
Q

Which valves will receive a close command when the DITCHING pushbutton is depressed (ARPO)?

A

The operating CPC sends a “close” signal to the Outflow Valve, emergency
ram air inlet, avionics ventilation inlet and outlet (extract) valves, and the
pack flow control valves, which are all located below the aircraft floatation
line.

NOTE: The Outflow Valve will close only when the pressurization system is in automatic mode. It will not close automatically if it is under manual control.

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2
Q

Will the DITCHING pushbutton always close the outflow valve?

A

No

The Outflow Valve will close only when the pressurization system is in automatic mode. It will not close automatically if it is under manual control.

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3
Q

Can the pilot control the outflow valve?

A

Yes

If both automatic systems fail, the Flight Crew may use the CABIN PRESS control panel to take over manual control of cabin pressurization.
• Release the MODE SEL pushbutton to select MAN, and
• Push the MAN V/S CTL switch UP or DN to increase or decrease cabin altitude

The first of these actions cuts off power to the AUTO motors and enables the MAN motor to control the outflow valve.

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4
Q

How many controllers are in the pressurization system?

A

Two identical, independent, digital cabin pressure controllers (CPCs) automatically control
the system by maintaining the proper cabin pressure.

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5
Q

How do you manually switch controllers?

A

Selecting the MODE SEL pb to MAN for at least 10 seconds, then returning it to AUTO allows switching between the two CPC Systems.

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6
Q

What does an amber FAULT light in the CABIN PRESS MODE SEL pushbutton indicate?

A

The FAULT will appear in amber along with the related ECAM caution when both automatic systems are faulty.

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7
Q

From what source does the pressurization system obtain landing elevation?

A

Air pressure in the cabin follows external schedules that the system receives as signals from the Flight Management and Guidance System (FMGS).

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8
Q

What protects the airframe from excessive cabin differential pressure?

A

Two independent pneumatic safety valves prevent cabin pressure from going too high (8.6 psi above ambient) or too low (1 psi below ambient) to protect the airframe from excessive cabin differential pressure.

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9
Q

How many outflow valve motors are installed?

A

one outflow valve, with an actuator that incorporates three motors (two for automatic operation, one for manual operation)

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10
Q

What flow rate is automatically selected when APU bleed air is in use or during single pack operation?

A

Whatever the crew selects, the system delivers HI (120%) flow for any of the following circumstances:
• In single-pack operation,
• When the APU is supplying bleed air

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11
Q

When should the PACK FLOW selector not be in the normal position?

A

LO should be selected with less than 115 passengers onboard for fuel savings. The HI position can be selected for hot and humid conditions or as directed for smoke ventilation.
LO: 80% flow for less than 115 passengers (140 passengers A321)
NORM: 100% flow
HI: 120% flow for high demand conditions

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12
Q

If the engine bleed air in-flight is too low what will occur?

A

When the cooling demand in one zone cannot be satisfied due to low bleed pressure, the air conditioning system controller sends a pressure demand signal to both Engine Interface Units (EIU) to increase the minimum idle and to raise the bleed pressure.

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13
Q

What would cause an amber FAULT light to illuminate in the PACK 1 and/ or Pack 2 pushbutton (OOD)?

A

The FAULT light comes on amber, and a caution appears on the ECAM, if the:

  • pack flow control valve position disagrees with the selected position,
  • or in the case of compressor outlet overheat
  • or pack outlet overheat.
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14
Q

At what cabin differential pressure does the RAM AIR valve open?

A

The ON light comes on white and the emergency ram air inlet opens provided:
• the DITCHING pb is in the normal OFF, (lights out) position
• differential pressure is < 1 psi

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15
Q

What causes the Pack Flow Control valve to automatically close?

A

The pack valve will close for the following:
1. Low bleed pressure
2. Compressor outlet overheat
3. Associated FIRE pb is pressed
4. DITCHING pb is selected ON
5. Engine start sequence as follows:
If the crossbleed valve is closed, the valve located on the starting engine side immediately closes when the MODE selector is set to IGN (or CRK).
It remains closed on the starting engine side (provided the crossbleed valve is closed) when:
• The MASTER sw is set to ON (or MAN START pb set to ON)
• The start valve is open
• N2 < 50%
NOTE: If the crossbleed valve is open at engine start, both pack flow control valves close.
On the ground, reopening of the valves is delayed for up to 60 seconds to avoid a supplementary pack closure cycle during second engine start.

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16
Q

When the mode selector is out of the AUTO position, how do you set a landing elevation?

A

The crew only needs to select the landing field elevation. In this semi-automatic mode, the pressurization system uses the manually-selected landing field elevation for internal schedules.

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17
Q

What does an amber FAULT light in the HOT AIR pushbutton indicate?

A

The FAULT light comes on amber, along with an associated ECAM caution,
when a duct overheat is detected.

18
Q

How many Air Conditioning System Controllers are there?

A

2

Two air conditioning system controllers (ACSCs) regulate the temperature of its associated pack

19
Q

Describe how the Air Conditioning System Controllers regulate temperature?

A

Two air conditioning system controllers (ACSCs) regulate the temperature of its associated pack, by modulating the bypass valve and the ram air inlet flap.

20
Q

What occurs when an active lane of an Air Conditioning System Controller fails?

A

No effect, as the second lane takes over.

21
Q

What occurs when both lanes of an Air Conditioning System Controller fail?

A

The related pack is lost, and the hot air pressure-regulating valve and associated trim air valves close.

22
Q

How does the Air Conditioning System Controller configure its associated pack ram air inlet flap for takeoff and landing to avoid the ingestion of foreign matter?

A

The ram air inlet flap closes during takeoff and landing to avoid the ingestion of foreign matter.

During takeoff, the ram air inlet flap closes when takeoff power is set, and the main landing gear struts are compressed.

During landing, it closes as soon as the main landing
gear struts are compressed, as long as speed is at or above 70 kts. It opens 20 seconds after the speed drops below 70 kts.

23
Q

If an air cycle machine (ACM) fails, what occurs?

A

If the Air Cycle Machine (ACM) fails (compressor/turbine seizure), the affected pack may be operated in heat exchanger cooling mode.

24
Q

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

A

The pack valve will close for the following:
5. Engine start sequence as follows:
If the crossbleed valve is closed, the valve located on the starting engine side immediately closes when the MODE selector is set to IGN (or CRK).
It remains closed on the starting engine side (provided the crossbleed valve is closed) when:
• The MASTER sw is set to ON (or MAN START pb set to ON)
• The start valve is open
• N2 < 50%
NOTE: If the crossbleed valve is open at engine start, both pack flow control valves close.
On the ground, reopening of the valves is delayed for up to 60 seconds to avoid a supplementary pack closure cycle during second engine start.

25
Q

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

A

When the X BLEED selector is in the AUTO position, the crossbleed valve will open and close automatically(mirroring the APU bleed valve, as follows:
• If the APU bleed valve is open, the crossbleed valve will open
• If the APU bleed valve is closed, the crossbleed valve will close
• The crossbleed valve will also close if the system detects a bleed air leak (except during engine start)

26
Q

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

A

APU will be supplying all bleed air to the system.

27
Q

The pneumatic system is monitored and controlled by what?

A

By two Bleed Monitoring Computers (BMC1

and BMC2), the overhead AIR COND panel, and the ECAM.

28
Q

If one BMC fails, can the other take over?

A

Yes, the adjacent BMC takes over the monitoring of the bleed system

29
Q

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

A

APU BLEED leak

This amber light comes on, and an ECAM caution appears

30
Q

What causes the amber FAULT light on the ENG 1 BLEED and/ or ENG 2 BLEED pushbutton (OOLD)?

A

• there is an (O)verpressure downstream of the bleed valve
• there is a bleed air (O)verheat
• there is a wing or engine pylon (L)eak on the related side
Valve (D)iscontinuity
• the bleed valve is not closed during engine start
• the bleed valve is not closed with APU bleed ON

The amber light comes on, and an ECAM caution appears

31
Q

What are the two functions of the engine bleed valves?

A

They act as a (1) shut-off

and (2) pressure regulating valve

32
Q

When does the Lav/Galley Extract Fan operate?

A

The extraction fan runs continually when electric power is available.

33
Q

What is the purpose of the CAB FANS?

A

Recirculate cabin air

The mixer unit combines cold fresh air from the packs with the cabin air being recirculated through recirculation fans (CAB FANS)

34
Q

With BLOWER and EXTRACT pushbuttons in AUTO how does the system operate?

A

On Ground
Open configuration when skin temp is 48°F (9°C) or higher.
Closed configuration when skin temp is 53°F (12°C) or lower.
NOTE: Between 48°F and 53°F (9°C and 12°C) the configuration stays in previous configuration until new temperature threshold is reached.

In Flight
Intermediate configuration when skin temp is 90°F (32°C) or greater.
Closed configuration when skin temp is 95°F (35°C) or lower.
NOTE: Between 90°F and 95°F (32°C and 35°C) the configuration stays in previous configuration until new temperature threshold is reached.

35
Q

With both BLOWER and EXTRACT pushbuttons in OVRD (smoke configuration) what are the positions of the INLET and OUTLET (EXTRACT) valves?

A

The inlet valve is closed, the outlet/extract valve is open

36
Q

What is the status of the Blower and Extract fans with the Blower and Extract pushbuttons in OVRD?

A

the blower fan stops the extract fan continues to run.

37
Q

When is air conditioning introduced into the avionics compartment?

A

When both the BLOWER and the EXTRACT pushbuttons are set to the OVRD position, the air conditioning system supplies cooling air, which is then exhausted overboard through the small internal flap opening located within the outlet/extract valve.

38
Q

Is the skin heat exchanger ever bypassed in flight?

A

Yes, in the Smoke Configuration.

39
Q

What does an amber FAULT light on the BLOWER pushbutton indicate?

A 
• blowing pressure is low (see Note)
• duct overheats (see Note)
• computer power supply fails
• smoke warning is 
NOTE: If the warning occurs on the ground when the engines are stopped, the external horn sounds.
40
Q

What does an amber FAULT light on the EXTRACT pushbutton indicate?

A

• extract pressure is low (see Note)
• computer power supply fails
• smoke warning is activated
NOTE: If the warning occurs on the ground when the engines are stopped, the external horn sounds.

41
Q

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

A

If both the BLOWER and EXTRACT fault lights come on, the SMOKE light on the EMER ELEC PWR panel also illuminates

42
Q

What does the CARGO HEAT HOT AIR amber FAULT light indicate?

A

The amber light illuminates and ECAM caution come on, when a duct overheat is detected (190°F/88°C).

The light goes out, when the temperature drops below 158°F (70°C), and OFF is selected. Then, if the pushbutton is set to on, the system resets.

ASA FH 01/13/21 (13 decks)

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