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Boeing 787 > Air System > Flashcards

Air System Flashcards

0
Q

When are the deflector doors deployed?

A

During normal ground operations and landing phases of flight.

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1
Q

What is the intake source for the CAC’s?

A

Two dedicated inlets located in the wing/body fairings.

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2
Q

The airplane is divided in to how many temperature zones?

A
  1. Flight deck + 6 cabin zones (A, A1, B, B1, C, D)
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3
Q

How many CAC’s are running on the ground using the APU as the power source? What happens during cold weather ops?

A

Normally only one CAC per side. Both CAC’s commanded on during cold weather ops. (Below -1C)

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4
Q

During engine start, the CAC’s are commanded off. How soon after engine start do the packs restart?

A

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

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5
Q

If both engines are started together, when do the packs restart?

A

Packs restart immediately after the second engine is running if the two minute limit is met.

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6
Q

It may be possible to draw fresh, unpressurized air into the airplane. If so, under what circumstances?

A

Only when the airplane is unpressurized.

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7
Q

What determines the pack outlet temperature?

A

The temperature zone requiring the coolest temperature controls the pack outlet temperature.

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8
Q

Describe how the trim valves function as cabin temperature regulators?

A

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

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9
Q

How many trim air systems are there? Are there any manual controls?

A

2 trim air systems, left and right. System is automatic but the flight deck controls are the trim air switches and temp control switches.

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10
Q

How many CAC’s feed each pack? What happens in the event of ONE CAC failure?

A

2 CAC’s feed each pack. A single CAC is sufficient to operate the associated pack in all modes.

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11
Q

What does the EICAS message “PACK L/R” indicate?

A
  • Pack Overheat - Other significant pack fault - Pack switches selected off
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12
Q

Is there any situation where some recirculated air will be supplied to the flight deck?

A

If one pack is OFF and it’s associated recirculating fan is ON.

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13
Q

What is standby cooling mode?

A

An automatic built-in redundancy in the packs for certain internal malfunctions provides continued service. ACM is bypassed and air goes directly from primary heat exchanger to compact mixer.

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14
Q

How is a standby cooling mode of a pack indicated?

A

EICAS advisory “PACK MODE L/R” “STBY COOLING” in amber on AIR synoptic.

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15
Q

Which zones get recirculated and which get 100% fresh air?

A

100% to the flight deck. Recirculated air mixed with fresh to the cabin zones.

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16
Q

What temperature will be maintained in FWD and BULK cargo with the switches in AUTO?

A

Approximately 21 C

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17
Q

Lower deck air either goes overboard or into the lower recirculating system. What happens there?

A

Lower recirculating ducts contain liquid-to-air heat exchangers capable of additional cabin cooling, reducing the power required by the CAC’s. Lower recirculating cooling provided by the ICS.

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18
Q

What services uses engine bleed air?

A

Thermal Engine Anti-ice system only

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20
Q

Should live animals be carried in the aft cargo compartment? If not, why?

A

No. Compartment is only kept above freezing.

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21
Q

Why is the air pressure supplied to the flight deck higher than that supplied to the cabin?

A

To prevent smoke from entering flight deck.

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22
Q

How is the forward cargo compartment temperature controlled?

A

Automatically controlled by: -Forward E/E exhaust air -An in-line electric heater -Forward cargo exhaust fan

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23
Q

How many recirculating fans are there?

A

3 in total. 1 upper and 2 lower.

24
Q

If the FWD and BULK switches are off, what will the temperature in respective compartment be?

A

Above freezing

24
Q

How is the bulk cargo compartment heated?

A

Ventilation and heat provided by: -Cabin air passing through a supply fan -In line electric heater -Residual heat from AFT E/E exhaust.

25
Q

How many supply fans drive the airflow for FWD equipment cooling? How many fans are available?

A

One primary supply fan drives the airflow, with a backup fan operating automatically in case of failure. One vent fan. 3 fans available in total.

26
Q

Is there any flight deck control of the ICS?

A

No, system is automatic.

27
Q

When does the forward equipment cooling system go into override mode?

A

-FWD EQUIP COOLING switch selected to OVRD -In flight, both supply fans fail -In flight, low airflow is detected -Both flow sensors fail -In flight, excessive temperature is detected -Smoke detected in the system or the FWD cargo area -FWD CARGO FIRE ARM switch is ARMED

28
Q

What happens when the FWD equipment cooling system is in override mode?

A

-Forward cargo heat and overboard vent valves close. -Both supply fans and and the vent fans commanded off -Forward equipment cooling override valve to override position Cabin diff pressure draws air through panels and forward E/E equipment, creating a reverse flow that exits through the override valve to an overboard venturi.

30
Q

Exhaust air from the FWD equipment cooling system has two possible destinations. Where?

A

-Forward cargo heat -Forward outflow valve

31
Q

What is the function of the Miscellaneous Cooling System?

A

System providing cooling to IFE equipment in the fwd E/E bay as well as other non-essential equipment located in the crown and areas of the lower lobe.

32
Q

Is there any limitation to the FWD equipment cooling system in override mode?

A

Override mode supplies adequate cooling in cruise, but the airflow will decrease with lower altitude and lower diff pressure.

33
Q

What is the function of the ICS?

A

Integrated Cooling System. A centralized refrigeration system providing cooling for the galley carts and assisting in cooling recirculated cabin air.

33
Q

Are there separate liquid systems for the PECS and ICS?

A

Yes, separate systems but they are integrated. Supplemental cooling units (SCU) in the ICS system use PECS liquid to cool down the system.

34
Q

What is the function of the Power Electronics Cooling System (PECS)?

A

Cooling system for the large motor power distribution system in the aft E/E.

35
Q

When is a single liquid cooling loop displayed on the STATUS display?

A

When only ONE forward external power is ON.

36
Q

How many pack control systems are there? What happens in the event of a malfunction?

A

Two identical pack control systems. If one fails, automatic switching to the other controller.

37
Q

When may the CAC deflector doors retract?

A

On the ground with ambient temperature below 2 C or above 35 C.

38
Q

What effect does turning the recirculating fans have on the airflow to the cabin?

A

Decreased airflow to the cabin.

39
Q

What happens if a temperature setting is unavailable to the pack temperature controller?

A

Pack outlet temperature regulated to last temp set or an average of 24 C.

40
Q

When does the humidification system operate?

A

Automatically 20 minutes into cruise above 25,000’ and switches off 1-1,5h before landing.

41
Q

How does the Cabin Pressure Controller System (CPCS) get it’s information for the pressurization schedule?

A

It uses ambient pressure and flight plan data from the FMC.

42
Q

What are the three modes of the Cabin Pressure Control System (CPCS)?

A

Climb, Cruise & Descent

43
Q

What is the maximum altitude normally in cruise?

A

6000’

44
Q

What may the cabin altitude climb to in degraded mode?

A

8000’

45
Q

Where does the Cabin a Pressure Control System get its barometric reference to pressurize the cabin slightly below landing altitude?

A

Captain’s altimeter setting

46
Q

Is there another way of setting landing altitude should the normal data not be available?

A

Yes, by pulling out the LDG ALT selector on the pressurization panel, and manually setting a landing altitude.

47
Q

What landing altitude will the CPCS assume if no data is available from the FMC or manually set?

A

2000’

48
Q

How long should the OUTFLOW VALVE MANUAL switch be held to ensure full travel of the valve from open to closes or v.v. ?

A

30 seconds

49
Q

ATC instructs an unplanned intermediate level off. What happens to the pressurization system? What happens if the level off was planned in the FMC?

A

Cabin altitude remains constant as long as the altitude is constant. In case of an FMC planned level off, that will be taken into account and the cabin will continue climbing, but at a slower rate to cruise alt.

50
Q

When does the engine anti-ice valves close automatically?

A

-During start -Bleed air overtemperature -Bleed air overpressure -When an engine fire switch is pulled -When a bleed air leak is detected

51
Q

Where in the system does the AVS deliver the airflow?

A

Downstream of the left pack.

52
Q

How can power be removed from the miscellaneous cooling system?

A

With the IFE power switch.

53
Q

What are the limitations of the standby cooling mode?

A

Pack cooling capacity may be less, resulting in warm temperatures at lower altitudes.

If the other pack is operating in normal mode, the standby cooling pack will shut down at lower altitude and higher OAT, where ambient conditions do not allow for standby cooling.

54
Q

What is the temperature range for the FWD CARGO A/C control? What temperature is the 12 o’ clock position?

A

Approximately 4°C to 27°C. 12 o’clock is 16°C.

55
Q

How many cabin zones are supplied by each trim air system?

A

Each trim air system supplies two cabin duct zones and the flight deck.

56
Q

What is the function of the “AIR COND RESET” switch?

A
  • Resets any air conditioning faults and attempts to restart normal operation - Resets any trim air valves held closed due to overheat, control failure or valve failure - Attempts to reset a failed recirculation fan - Resets fault protection

Boeing 787 (18 decks)

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