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United 787 SV Study Guide 12/2023 > Air Systems > Flashcards

Air Systems Flashcards

1
Q

The Flight Deck Temperature selector sets a target flight deck temperature.
When selected to the 12 o’clock position, what temperature is commanded?
[8.20.30]
A. 65 - 85 degrees.
B. 75 degrees.
C. 65 - 75 degrees.
D. 70 degrees.

A

B. 75 degrees.

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2
Q

The recirculation fans draw air from the cabin, through filters, then reintroduce it into
the cabin distribution ducts. Turning OFF a fan will result in increased cabin air flow.
[8.20.20]
A. True.
B. False

A

B. False

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3
Q

The flight deck receives 100% fresh conditioned outside air and the passenger cabin
receives a mix of outside air and recirculated air. [8.20.20]
A. True.
B. False.

A

A. True.

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4
Q

What does the “PACK L” EICAS message mean? [8.20.20]
A. The left pack is inoperative.
B. A pack component has failed and the pack has reverted to standby cooling.
C. A bleed leak has been detected and the pack has shut down.
D. The associated pack is operating at maximum capacity.

A

A. The left pack is inoperative.

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5
Q

What are the uses of engine bleed air? [8.20.10]
A. TAT probe aspiration.
B. Ice detection probe anti-ice.
C. Engine core and inlet cowl anti-ice.
D. Both B and C are correct.

A

C. Engine core and inlet cowl anti-ice.

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6
Q

The forward cargo compartment is heated by: [8.20.20]
A. Forward E/E cooling exhaust air.
B. Thermal blankets.
C. Inline electric heater in the cargo compartment.
D. A and C are correct.

A

D. A and C are correct.

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7
Q

A loss of forward equipment cooling on the ground results in: [8.20.20]
A. A ground crew call horn sounding in the nose wheel well.
B. EQUIP COOLING FWD EICAS advisory message.
C. Equipment cooling does not operate on the ground.
D. Both A and B are correct.

A

D. Both A and B are correct.

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8
Q

The pressurization system normally receives flight parameters: [8.20.40]
A. From the Sabre pressurization uplink.
B. From ambient pressure and the FMC flight plan data.
C. From the Landing Altitude settings on the overhead pressurization panel.
D. Pressurization entries on the AIR synoptic.

A

B. From ambient pressure and the FMC flight plan data.

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9
Q

Pressing the AIR COND RESET switch on the overhead panel (per non-normal) will:
[8.20.30]
A. Reset a failed recirculation fan.
B. Reset a failed trim air valve.
C. Reset a pack fault
D. All the above.

A

D. All the above.

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10
Q

An EICAS message of PACK MODE (L or R) indicates _______. [8.20.20]
A. The pack is operating in the Standby Cooling mode.
B. The pack may shut down at lower altitudes and higher outside air
temperatures when ambient conditions do not permit standby cooling.
C. The pack has failed and a descent to an altitude below FL250 is required.
D. A and B are correct.

A

D. A and B are correct.

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11
Q

Cabin altitude and full ventilation rates can be maintained by either outflow
valve. [8.20.40]
A. True.
B. False

A

A. True.

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12
Q

With a PACK L or PACK R message displayed on EICAS due to an overheat:
[8.20.20]
A. The pack reverts to standby cooling.
B. The pack flow rate is reduced to the minimum to keep the pack outlet
temperature at an acceptable level.
C. The pack automatically shuts down.
D. The pack automatically switches to the controller for the opposite pack if
available.

A

C. The pack automatically shuts down.

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13
Q

If the cabin temperature controller fails, the pack(s) will: [8.20.20]
A. Modulate to keep cabin temperature between 40 and 110 F.
B. Maintain cabin temperature within 15 degrees of TAT.
C. Trip and automatically shut down.
D. Maintain the last cabin temperature or 75 F.

A

D. Maintain the last cabin temperature or 75 F.

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14
Q

Forward equipment cooling system provides ventilation to the FWD E/E bay and
electronic equipment on the flight deck. [8.20.20]
A. True.
B. False.

A

A. True.

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15
Q

The pressurization system uses to provide landing altitude barometric
pressure correction. [8.20.40]
A. The First Officer’s radio altimeter reading
B. The stored FMC TDZE
C. The standby altimeter setting
D. The Captains altimeter setting

A

D. The Captains altimeter setting

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16
Q

Pack outlet temperature is set by the zone requesting the coldest temperature. All
other zones are then warmed by: [8.20.20]
A. Inline duct heaters
B. Engine bleed air
C. The Trim Air system
D. Temperature regulators in each PSU

A

C. The Trim Air system

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17
Q

The bulk ventilation fan operates: [8.20.20]
A. When AUTO is selected on the FWD cargo temp switch.
B. When AUTO is selected on the BULK CARGO TEMP switch.
C. Anytime live animals are loaded in the bulk compartment.
D. When an aft cargo fire is detected.

A

B. When AUTO is selected on the BULK CARGO TEMP switch.

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18
Q

Pulling the Landing Altitude (LDG ALT) selector: [8.20.40]
A. Causes the EICAS pressurization systems indications to display.
B. Allows the crew to directly adjust the cabin altitude while in flight.
C. Overrides the FMC altitude inputs to the cabin altitude controllers.
D. Both A and C.

A

D. Both A and C.

19
Q

Which of the following cause the FWD CARGO TEMP switch “OFF” light to
illuminate amber? [8.20.30]
A. FWD CARGO TEMP switch selected off.
B. A fire has been detected in the AFT/BULK CARGO compartments.
C. Forward cargo heater overheat.
D. A and C are correct.

A

D. A and C are correct.

20
Q

For takeoff, the automatic pressurization system supplies a small positive
pressurization at rotation to provide a smooth transition to the cabin altitude climb
schedule. [8.20.40]
A. True.
B. False.

A

A. True.

21
Q

The use of both packs provides more efficient operation and is recommended for
normal ground operations. [8.20.20]
A. True.
B. False.

A

A. True.

22
Q

Outside airflow to the cabin during normal operations may be reduced by: [8.20.20]
A. Selecting a higher master cabin temperature.
B. The flight attendant’s entry of the number of occupants on the CABIN
OCCUPANTS screen.
C. Ensuring the UPPER and LOWER recirculation fans are OFF.
D. Outside airflow cannot be changed.

A

B. The flight attendant’s entry of the number of occupants on the CABIN
OCCUPANTS screen.

23
Q

The Flight Deck Temperature selector on the air conditioning panel can select a
target temperature (e.g., 70°). [8.20.30]
A. True.
B. False.

A

A. True.

24
Q

The FWD and BULK CARGO TEMP switches when set to AUTO, maintain a
temperature of approximately F. [8.20.30]
A. 60°
B. 70°
C. 80°
D. None of the above.

A

B. 70°

25
Q

The pressurization system may be operated manually by: [8.20.40]
A. Setting the OUTFLOW VALVE switches to MAN and adjusting the outflow
valve position using the related OUTFLOW VALVE switch to OPEN or
CLOSE.
B. There is no manual mode capability.
C. Referencing the MCP ALTITUDE window.
D. A and C.

A

A. Setting the OUTFLOW VALVE switches to MAN and adjusting the outflow
valve position using the related OUTFLOW VALVE switch to OPEN or
CLOSE.

26
Q

What are the manual selection limits when using the Landing Altitude selector?
[8.20.40]
A. There are no limits.
B. 2000 feet below sea level to 14,000 feet above sea level.
C. 1000 feet below sea level to 10,000 feet above sea level.
D. 500 feet below sea level to 8500 feet above sea level.

A

B. 2000 feet below sea level to 14,000 feet above sea level.

27
Q

When will the pack OFF light illuminate amber? [8.20.30]
A. During engine start.
B. When there is a pack high temperature condition.
C. When manually selected to OFF.
D. Any of the above

A

D. Any of the above

28
Q

The alternate ventilation system: [8.20.20]
A. May only be used during pressurized flight.
B. Provides a means of ventilating the cabin in the event both packs are inop.
C. Provides a backup method of pressurizing the cabin if both packs fail.
D. Is designed to improve cabin airflow with the loss of one or two CACs.

A

B. Provides a means of ventilating the cabin in the event both packs are inop.

29
Q

The electrical system, using electronic controllers, can limit CAC operation during load
shed operations. [8.20.20]
A. True.
B. False.

A

A. True.

30
Q

During engine start, both packs shutdown and do not restart until 2 minutes after
the start is initiated and the engine is running. [8.20.20]
A. True.
B. False.

A

A. True.

31
Q

During cruise flight, the maximum cabin altitude during normal operations is .
[8.20.40]
A. 10,000 feet
B. 6000 feet
C. 8000 feet
D. 7000 feet

A

B. 6000 feet

32
Q

What cruise altitude is assumed if the cruise altitude from the FMC (while in AUTO
pressurization) is unavailable? [8.20.40]
A. With an FMC cruise altitude unavailable, manual LAND ALT selector must be
used.
B. 30,000 feet.
C. 43,000 feet.
D. 35,000 feet.

A

C. 43,000 feet.

33
Q

If PECS coolant level servicing is recommended, what indication(s) do the pilots
have of the condition? [8.20.30]
A. An EICAS “PEC LO” advisory message.
B. An RF indication by the quantity value on STATUS page
C. An amber indication for the quantity on the status page.
D. B and C are correct

A

D. B and C are correct

34
Q

The flight deck humidifier operates when the HUMID switch is ON and: [8.20.20]
A. Only when the airplane is on the ground.
B. Engine anti-ice is operating.
C. Only between 10,000 feet and 18,000 feet.
D. Above 25,000 feet. The system automatically switches OFF approximately
1 - 1.5 hours prior to touchdown.

A

D. Above 25,000 feet. The system automatically switches OFF approximately
1 - 1.5 hours prior to touchdown.

35
Q

The CAC deflector doors may retract on the ground when the ambient air
temperature is below 35°F or above 95°F. [8.20.20]
A. True.
B. False.

A

A. True.

36
Q

Cabin airflow may be adjusted by the flight attendants on the ground before
pushback using the Cabin Attendants Panel located at door 1L. [8.20.20]
A. True.
B. False.

A

A. True.

37
Q

The Lower Recirculation System provides additional cabin cooling and helps reduce
the power required by the CACs. [8.20.20]
A. True.
B. False.

A

A. True.

38
Q

To increase cabin fresh air flow the LOWER RECIRC fans may be turned OFF.
[8.20.20]
A. True.
B. False.

A

B. False.

39
Q

A single CAC provides sufficient air to operate the associated pack in all operating
modes. [8.20.20]
A. True.
B. False.

A

A. True.

40
Q

When the cabin occupant information is entered on the cabin attendant panel, the
following occurs: [8.20.20]
A. Sets the humidifier to full power.
B. Adjusts the CAC power consumption, fuel burn, and humidity in the cabin.
C. Turns off the cooling equipment system.
D. Removes ozone molecules for the supply air.

A

B. Adjusts the CAC power consumption, fuel burn, and humidity in the cabin.

41
Q

________ is the maximum takeoff and landing pressure altitude. [1.20.]
A. 6,500 feet
B. 8,000 feet
C. 10,000 feet
D. 14,000 feet

A

D. 14,000 feet

42
Q

Pressurization system indications are automatically displayed on the EICAS when:
[8.20.50]
A. AIR synoptic is displayed on any MFD.
B. Either outflow valve switch is in MAN.
C. EICAS message CABIN ALTITUDE is displayed.
D. Any of the above.

A

D. Any of the above.

43
Q

When carrying live animals: [8.20.20]
A. Only the forward cargo compartment may be used.
B. Only the aft cargo compartment may be used.
C. Only the bulk cargo compartment may be used.
D. Either the FWD or BULK compartments may be used.

A

D. Either the FWD or BULK compartments may be used.

United 787 SV Study Guide 12/2023 (16 decks)

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