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#B787 Air Systems, Anti-Ice Rain, Automatic Flight > Air System > Flashcards

Air System Flashcards

1
Q

How many temperature zones

A

7
1 Flight deck
6 Passenger A-D (Zones A and B contain sub-zones A1 and B1 that are not depicted on the air synoptic)

AOM 2.20.1

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2
Q

How many cabin air compressors (CAC)

A

4

AOM 2.20.1

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3
Q

When do deflector doors deploy in front of CAC inlets

A

During normal ground operations and landing phases of flight.

Doors may retract on the ground when ambient temperature is below 2 degrees C or above 35 degrees C

AOM 2.20.1

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4
Q

How many dedicated inlets supply the CAC’s

A

2
located in the wing to body fairings

AOM 2.20.1

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5
Q

How many air conditioning packs

A

2 identical packs

AOM 2.20.1

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6
Q

For ground operation how many CAC’s run when using APU as power source

A

Normally, to maximize system efficiency, only 1 CAC on each side runs.
During cold weather operations both CAC’s are commanded on.

AOM 2.20.2

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7
Q

What happens to the CAC’s during engine start

A

For normal engine start, all CAC’s are commanded off during initial start sequence.

Packs do not restart until at least 2 minutes after the engine start sequence is initiated and the engine is running.

If both engines are started together, and the 2 minute limit is met, packs restart immediately after the second engine is running.

AOM 2.20.2

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8
Q

How can you attempt to restore pack operation after an automatic shutdown

A

pressing the Air Conditioning Reset switch

AOM 2.20.2

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9
Q

What happens to the CAC’s during an in-flight starter assisted engine start

A

1 CAC runs to maintain pack operation and maximize power available for the engine cross start.

AOM 2.20.2

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10
Q

During a go-around with 1 engine inop, when could both packs load shed

A

If slat autogap is needed.

AOM 2.20.2

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11
Q

Is switching to standby cooling mode automatic

A

Yes
For certain internal malfunctions.

AOM 2.20.2

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12
Q

What happens when 1 pack is in standby cooling and the other is operating normally.

A

The pack in standby cooling mode shuts down at lower altitudes and higher outside air temperatures when ambient conditions do not permit standby cooling.

AOM 2.20.2/3

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13
Q

What do recirculation fans do

A

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

AOM 2.20.3

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14
Q

What air does the flight deck receive.

A

100% conditioned outside air.
Some recirculated air is supplied to the flight deck if 1 pack is off and it’s associated lower recirculation fan is on.

AOM 2.20.3

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15
Q

What does turning the recirculation fans off do

A

does not increase the amount of fresh air to pax cabin, but results in a decreased airflow instead.

AOM 2.20.3

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16
Q

Where is trim air added

A

trim air from each pack is added to the pack conditioned air to control the temperature in each zone.

AOM 2.20.4

17
Q

How many zone ducts does trim air supply

A

Each trim air system supplies 2 cabin zone ducts and 1 flight deck zone duct.

AOM 2.20.4

18
Q

How are Cabin zone temperatures regulated

A

by controlling pack outlet temperature and adding hot trim air

AOM 2.20.4

19
Q

What is the Cabin Temp selector reference temperature

A

between 18 and 29 deg C

AOM 2.20.4

20
Q

Can the target temperatures of each cabin zone be modified

A

Yes
+/- 6 degC within the range of 18-29 using the cabin management system

AOM 2.20.5

21
Q

What happens if the left or right trim air system is off

A

cabin temperature controllers attempt to maintain all zones at the average target temperature.
Flight deck temperature is maintained between 18-29 degC

AOM 2.20.5

22
Q

When does the Humidification System operate

A

20 minutes into cruise above 25000’, when the HUMID switch is on and is automatically switched off approximately 1-1.5 hours prior to touch down.

AOM 2.20.5

23
Q

Are cargo compartments temperature controlled

A

The forward and bulk cargo compartments have independent temperature control systems.
The aft cargo compartment is heated but the temperature is uncontrolled.

AOM 2.20.6

24
Q

What is the difference between “Forward Cargo Heat” and “Forward Cargo Compartment Air Conditioning Systems” that may be installed on different aircraft

A

F.C.C.A.S can also carry perishable or other temperature sensitive cargo.
it’s temperature range is 4-27 degC while Forward Cargo Heat systems target temperature is 21 degC

AOM 2.20.6

25
Q

When does the fwd Equipment Cooling automatically switch to override

A
  • FWD EQUIP COOLING switch is selected to OVRD or
  • in flight, both supply fans fail or
  • both flow sensors fail, or
  • in flight, low airflow is detected or
  • in flight, excessive temperature is detected in the fwd equipment cooling system or
  • smoke is detected in the fwd equipment cooling system or the fwd cargo area or
  • the fwd Cargo Fire Arm switch is Armed

AOM 2.20.12

26
Q

What happens when the Fwd Equip Cooling is in override

A
  • fwd cargo heat and overboard vent valves are closed
  • vent fan and both supply fans are commanded off
  • fwd equipment cooling override valve is commanded to the override position

Cabin differential pressure draws air through the flight deck panels and the fwd E/E equipment racks to create reverse flow of air across the equipment, then exits through the override valve to an outboard venturi

AOM 2.20.12

27
Q

What is PECS

A

Power Electronics Cooling System
it is a liquid cooling system for the large motor power distribution system located in the aft E/E equipment compartment. It also provides cooling to the supplemental cooling units and associated motor controllers of the integrated cooling system

AOM 2.20.14

28
Q

How many loops does PECS have

A

2 independent liquid cooling loops

AOM 2.20.14

29
Q

What temperature does PECS control the loop to

A

27 degC

AOM 2.20.14

30
Q

How many modes does the pressurization system have

A

2
automatic and manual

AOM 2.30.1

31
Q

What is the normal cruise cabin altitude

A

at or below 6000’

AOM 20.30.2

32
Q

What does bleed air supply

A

Bleed air is only used for the engine core and inlet cowl anti-ice operations.

AOM 2.40.1

#B787 Air Systems, Anti-Ice Rain, Automatic Flight (6 decks)

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