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787 Technical Questions > 02. Air Conditioning > Flashcards

02. Air Conditioning Flashcards

1
Q

What is the air source for the packs?

A

Outside air

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2
Q

How many Cabin Air Compressors (CACs) are there?

A

Four

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3
Q

What is the purpose of the CACs?

A

Pressurize and regulate the flow of outside air to the packs.

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4
Q

How many CACs are required to provide sufficient air to a single pack in all modes?

A

One

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5
Q

How many pack control systems are there?

A

Two

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6
Q

Following a pack shut down, how can the pack be reset?

A

Pressing the AIR CONDITIONING RESET switch

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7
Q

In Standby Cooling mode, which messages are displayed on: -

a. EICAS?
b. Air synoptic?

A

a. PACK MODE (L/R) – EICAS Advisory b. STBY COOLING (amber)

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8
Q

What is the source of flight deck air?

A

The flight deck receives 100% conditioned outside air

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9
Q

Why is the conditioned air in the flight deck maintained at a higher pressure than the cabin?

A

To prevent smoke from entering the flight deck

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10
Q

What is the purpose of the Recirculation Fans?

A

They assist the packs to maintain a constant ventilation rate through the cabin

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11
Q

What is the result of switching the Recirculation Fans to OFF?

A

Decreased air flow in the cabin

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12
Q

What is the purpose of the Alternate Ventilation System (AVS)?

A

To ventilate the cabin and flight deck when both packs are inoperative

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13
Q

Where is the selected Cabin Master temperature indicated?

A

The AIR synoptic

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14
Q

What is the source of trim air?

A

From each pack

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15
Q

Are all zones supplied with trim air?

A

Yes

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16
Q

What determines the pack outlet temperature?

A

The temperature zone requiring the coolest temperature

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17
Q

Over what temperature range can cabin crew adjust the cabin zones target temperature?

A

Plus or minus 6o C, within the range of 18o to 29o C.

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18
Q

What temperature is maintained in all zones if a trim air supply is lost?

A

The cabin temperature controllers attempt to maintain all zones at the average target temperature

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19
Q

What happens if either the flight deck or cabin temperature selection is unavailable to the pack temperature controller?

A

The pack outlet temperature is regulated to achieve either the last temperature set or an average cabin temperature of 24o C

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20
Q

What type of heater is used for: -

a. Shoulder heaters? b. Footheaters?

A

a. Electric elements in the side window air diffusers

b. Electric heating elements

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21
Q

Is shoulder and foot heat available on the ground?

A

No

22
Q

Where are the controls for the Forward Cargo and Bulk heat?

A

Overhead panel

23
Q

What is the source of air for the Forward Cargo heating system?

A

Forward E/E exhaust ventilation air

24
Q

How is the temperature controlled in the Forward Cargo?

A

Automatically using forward E/E exhaust air, a dedicated refrigeration unit, an in-line electric heater and a forward cargo exhaust fan


25
Q

What does selecting the FWD Cargo Flow switch to HIGH attempt to achieve?

A

To prevent or remove cargo odors from the passenger cabin

26
Q

What is the source of air for the Bulk Cargo heating?

A

Cabin air passing through a supply fan, an in-line electric heater and residual heat from the aft E/E cooling exhaust

27
Q

With AUTO selected for the Bulk Cargo temperature, how is airflow increased

A

The bulk ventilation fan operates



28
Q

Should live animals be carried in the Aft Cargo compartment? If not, why not

A

No, the aft compartment is not temperature controlled
2.AIR


29
Q

What is the source of air for the Aft Cargo heat?

A

Aft E/E cooling exhaust air

30
Q

Which areas does the Forward Equipment Cooling system provide cooling airflow?

A

Flight deck and forward E/E equipment compartment

31
Q

Which areas does the Aft Equipment Cooling system provide cooling airflow?

A

The Aft E/E equipment compartment

32
Q

With the Forward or Aft Equipment cooling system in AUTO: -

Where is the cooling air drawn from? Whatmovesthecoolingairthroughthesystem? Where is the air exhausted?

A

a. Cabin air
b. One of two supply fans
c. A dedicated overboard vent valve or to the appropriate cargo
compartment, if it requires additional heat

33
Q

With the Forward or Aft Equipment cooling system in OVRD: -

How is air drawn through the system? Whereisthisairexhausted?

A

a. Cabin differential pressure draws air to create a reverse flow of air across the equipment
b. Through the override valve to an overboard venturi

34
Q

What is achieved with the: -

a. Forward Equipment Cooling switch in OVRD? b. AftEquipmentCoolingswitchinOVRD?

A

a. Aids smoke evacuation from the flight deck

b. Aids smoke evacuation from the passenger cabin

35
Q

Where is the Power Electronics Cooling System (PECS) located?

A

Aft E/E equipment compartment

36
Q

What does PECS supply liquid cooling for?

A

The Large Motor Power distribution system and the supplemental cooling units & associated motor controllers of the Integrated Cooling System (ICS)

37
Q

What colours are used for Cabin Differential Pressure (∆P) operating ranges displayed on EICAS and what do they indicate?

A
  • White: normal operating range
  • Amber: above normal range
  • Red: excessive differential pressure
38
Q

What is the indication on the EICAS display that an outflow valve is under manual control?

A

The letter M (amber) is displayed next to the Outflow Valve Position indicators

39
Q

How many outflow valves are there?

A

Two, one forward and one aft

40
Q

What protects the fuselage against excessive pressure differentials?

A

Positive and negative pressure relief valves

41
Q

When in the automatic pressurisation mode, list the data inputs used to calculate pressurisation schedule?

A

Ambient pressure and flight plan data from the FMC

42
Q

In climb mode, at what rate will the cabin climb?

A

On a schedule related to the aircraft climb rate and flight plan cruise altitude

43
Q

In cruise mode, what is the maximum cabin altitude?

A

6,000ft

44
Q

From where is the landing altitude barometric pressure correction obtained?

A

Captain’s altimeter setting

45
Q

What will the cabin altitude be just before touchdown?

A

Cabin altitude decrease to slightly below FMC planned landing altitude

46
Q

What happens to the outflow valves at touchdown?

A

Both valves open to depressurise the cabin

47
Q

How is cabin altitude controlled for: -

a. Takeoffs from airports above 8000ft? b. Landings at airports above 8000ft?

A

a. The cabin descends to the target altitude during climb
b. The cabin climbs to 6,000ft and before arrival climbs to destination
elevation

48
Q

If a depressurisation occurs, what will the outflow valves do initially?

A

They close to preserve cabin pressure

49
Q

During a descent after a depressurisation, when will the outflow valves automatically drive to fully open

A

When the airplane reaches 15,000ft or descends below the cabin altitude

50
Q

How long does it take for an outflow valve to travel from fully closed to fully open when controlled manually?

A

30 seconds

51
Q

What supplies bleed air?

A

The engines.

52
Q

What is bleed air used for?

A

Engine core and inlet cowl anti–ice operations.

787 Technical Questions (20 decks)

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