Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

UAL 787 SV Study Questions Nov 23 > AirSys/Pneumatics/AirCon/Presssure > Flashcards

AirSys/Pneumatics/AirCon/Presssure Flashcards

1
Q

What temperature is commanded when the cabin temperature controller is at the 12 o’clock position?

A. 65 - 85 degrees.
B. 65 - 75 degrees.
C. 70 degrees.
D. 75 degrees.

A

D. 75 degrees.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What is the purpose of the recirculation fans?

A. The recirculation fans draw air from the cabin, through filters, then reintroduce it into the cabin distribution ducts.
B. They help maintain a constant ventilation rate through the cabin.
C. Lower recirculation cooling reduces the power required from the CACs.
D. All of the above are true.

A

D. All of the above are true.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What does the “PACK MODE” EICAS message mean?

A. A pack has tripped and requires resetting.
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

B. A pack component has failed and the pack has reverted to standby cooling.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What are the uses of engine bleed air?

A. TAT probe aspiration.
B. Engine anti-ice.
C. Engine core heat.
D. Both B and C.

A

D. Both B and C.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

The forward cargo compartment is heated by ____?

A. Forward equipment ventilation system discharge air.
B. Forward cargo bleed air duct.
C. Inline eletric heater for the FWD cargo compartment.
D. A and C are correct.

A

D. A and C are correct.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What does the EICAS message PACK (L, R) indicate?

A. A pack overheat or other significant pack fault has been detected.
B. The pack has been shut down automatically.
C.. While accomplishing the associated non-normal checklist, the AIR CONDITIONING RESET switch may be pushed for a possible reset of the pack.
D.. All of the above are true.

A

D.. All of the above are true.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What are the indications of a loss of forward equipment cooling on the ground?

A. A horn sounds in the nose wheel well.
B. EQUIP COOLING FWD EICAS 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.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Where does the pressurization system normally get flight operating parameters?

A. From ambient pressure.
B. From the FMC flight plan data.
C. From the settings on the overhead pressurization panel.
D. Both A and B are correct.

A

D. Both A and B are correct.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Which of the following is true concerning pack operation in the “Standby Cooling” mode?

A. For certain internal malfunctions, a pack automatically enters the Standby Cooling mode.
B. In Standby Cooling the pack shuts down at lower altitudes and higher outside air temperatures when ambient conditions do not permit standby cooling.
C. Decreased pack cooling capacity may result in warm flight deck or cabin temperatures at lower altitude.
D. All the above.

A

D. All the above.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Which statements(s) is/are true concerning the outflow valves.

A. Either valve is capable of full airflow and pressurization control.
B. If either valve fails full open, loss of pressurization will occur. C. Either or both valves can be controlled manually.
D. All of the above are true.

A

D. All of the above are true.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

When a pack overheat is detected:

A. The pack switches to standby cooling.
B. The pack flow rate is modulated to keep the pack outlet temperature low.
C. The pack automatically shuts down.
D. The pack automatically switches pack controllers.

A

C. The pack automatically shuts down.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

The forward equipment cooling system provides ventilation to:

A. The forward lavatories and galleys.
B. The bulk cargo compartment.
C. The passenger video equipment.
D. The forward E/E bay and electronic equipment on the flight deck.

A

D. The forward E/E bay and electronic equipment on the flight deck.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Landing altitude barometric pressure correction to the pressurization system comes from:

A. The Captains altimeter setting.
B. The FMC.
C. The standby altimeter setting.
D. The First Officers altimeter setting.

A

A. The Captains altimeter setting.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What determines the pack outlet temperature?

A. The master cabin temperature control.
B. The zone requesting the coldest temperature.
C. The average demand of all the systems.
D. The zone requesting the warmest temperature.

A

B. The zone requesting the coldest temperature.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

When does the bulk cargo fan operate?

A. When AUTO is selected on the bulk cargo temp switch.
B. When LOW is selected on the bulk cargo switch.
C. When OAT is between 65 - 75 degrees.
D. When an aft cargo fire is detected.

A

A. When AUTO is selected on the bulk cargo temp switch.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What can cause the FWD CARGO TEMP “OFF” light to illuminate amber?

A. FWD E&E cooling is in override.
B. A fire has been detected in the FWD CARGO compartment.
C. The FWD E&E exhaust fan is inoperative.
D. Any of the above.

A

D. Any of the above.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

When is it recommended to operate only one pack on the ground?

A. At the gate with only (both) FWD External power ON.
B. Only while taxiing single engine.
C. While taxiing, if the OAT is between 35 and 70 degree F.
D. It is not recommended for normal operations.

A

D. It is not recommended for normal operations.

18
Q

Outside airflow to the cabin during normal operations may be reduced by:

A. Selecting a higher master cabin temperature.
B. The flight attandents, by their entry of passanger count into the Cabin Attendant Panel.
C. Ensuring the UPPER and LOWER recirculation fans are ON.
D. Outside airflow cannot be changed.

A

B. The flight attandents, by their entry of passanger count into the Cabin Attendant Panel.

19
Q

With loss of inputs from the flight deck or cabin temperature controls, the pack(s) will:

A. Modulate to keep pack outlet temperature between 40 & 110 F.
B. Keep pack outlet temperature within 20 degrees of TAT.
C. Automatically shut down.
D. Maintain a cabin temperature of 75 F.

A

D. Maintain a cabin temperature of 75 F.

20
Q

Pulling the Landing Altitude (LDG ALT) selector:

A. Displays pressurization systems indications on the EICAS display.
B. Automatically limits the cabin climb and descent to 300 ft/min.
C. Overrides the FMC altitude inputs to the cabin altitude controllers.
D. Both A and C.

A

D. Both A and C.

21
Q

How does the automatic pressurization system keep “pressure bumps” from occuring during takeoff?

A. For takeoff, the system supplies a small positive pressure for smooth cabin altitude transitions.
B. During takeoff, both outflow valves remain closed until the aircraft altitude reaches 2000 ft.
C. Pressure relief valves provide a smooth transition from takeoff to inflight operations.
D. Both B and C.

A

A. For takeoff, the system supplies a small positive pressure for smooth cabin altitude transitions.

22
Q

Do the flight deck and passenger cabin temperature selectors on the air conditioning panel have a manual temperature control position?

A. No, neither on has a manual position.
B. Yes, both can be controlled manually.
C. The flight deck does, however the passenger cabin does not.
D. The passenger cabin does, however the flight deck does not.

A

A. No, neither on has a manual position.

23
Q

With the FWD and BULK CARGO TEMP switches set to AUTO, the compartment temperature is maintained to approximately ____ F.

A. 60
B. 70
C. 80
D. None of the above

A

B. 70

24
Q

The aircraft pressurization system is operated in the manual mode by:

A. Setting the OUTFLOW VALVE switches to MAN.
B. Operates only automatically.
C. Selecting the related OUTFLOW VALVE MANUAL switches to OPEN or CLOSE as required.
D. A and C.

A

D. A and C.

25
Q

When is the pack OFF light illuminated amber?

A. During engine start
B. When there is a pack or compressor outlet high temperature condition
C. When manually seleted to OFF
D. All the above

A

D. All the above

26
Q

The alternate ventilation system ____.

A. May only be used during pressurized flight.
B. Provides an alternate means of ventilating the cabin in the event both packs are inoperative.
C. Provides an alternate means of pressurizing the cabin in the event both packs fail.
D. Is to be used only with the non-normal checklist for smoke removal.

A

B. Provides an alternate means of ventilating the cabin in the event both packs are inoperative.

27
Q

Which statement(s) is/are true concerning Cabin Air Compressor (CAC) operation.

A. Cabin Air Compressor (CAC) operation may be limited during electrical load shed operations.
B. CACs regulate the airflow to the packs by modulating their output.
C. A single CAC provides sufficient air to operate its associated pack in all operating modes.
D.. All of the above are true.

A

D.. All of the above are true.

28
Q

During engine starts, both packs shutdown and do not restart until:

A. 30 seconds after either engine annunciates RUNNING on EICAS.
B. 2 minutes after the start is initiated and engine(s) is running.
C. Both engines reach 50%.
D. The A/C reset switch on the overhead panel is pushed.

A

B. 2 minutes after the start is initiated and engine(s) is running.

29
Q

During cruise flight, the maximum cabin altitude during normal operations is ____.

A. 10,000 ft.
B. 6000 ft.
C. 8000 ft.
D. 7000 ft.

A

B. 6000 ft.

30
Q

If the cruise altitude from the FMC (while in AUTO pressurization) is unavailable, the default cruise altitude will be ____.

A. 43,000 ft.
B. The altitude that the aircraft was at, at the time of signal failure.
C. 44,000 ft.
D. 35,000 ft.

A

A. 43,000 ft.

31
Q

When checking the PECS coolant level during preflight, the expected normal service level is ____.

A. 1.00
B. 10.0
C. 5.0
D. 1.2 or above

A

A. 1.00

32
Q

Flight deck humidity operates when the HUMID switch is ON and:

A. On the ground only.
B. Engine anti-ice is OFF.
C. Below 10,000 ft.
D. In cruise flight and is automatically switched OFF approximately 1 - 1.5 hours prior to touchdown.”

A

D. In cruise flight and is automatically switched OFF approximately 1 - 1.5 hours prior to touchdown.

33
Q

During preflight inspection, you notice the CAC deflector doors retracted. Is this normal?

A. No, the deflector doors should be fully open on the ground.
B. Yes, the deflector doors close when the ambient temperature is less than 35F or greater than 95F.
C. Yes, the deflector doors close automatically at engine shutdown.
D. No, the deflector doors should always be open until engine start.

A

B. Yes, the deflector doors close when the ambient temperature is less than 35F or greater than 95F.

34
Q

Airflow from the CAC’s to the packs may be regulated from the flight deck.

True False

A

False

35
Q

Additional cabin cooling and reduced power required by the CAC’s is provided by the:

A. PEC’s.
B. Lower recirculation system.
C. E&E supply fan.
D. External air.

A

B. Lower recirculation system.

36
Q

What are the effects of turning off the recirculation fans at the gate?

A. Reduces airflow to the cabin.
B. Increases the amount of fresh air entering the cabin.
C. Increases the airflow to the flight deck.
D. Has no effect on the cabin airflow, as the packs will increase flow to make up for turning off the fans.

A

A. Reduces airflow to the cabin.

37
Q

What are the possible electrical sources for operating the CACs at the gate?

A. Both FWD External plus AFT External ON.
B. Both FWD External ON.
C. APU powering the airplane.
D. A and C are both correct.

A

C. APU powering the airplane.

38
Q

What affect does the Cabin Occupant information (entered on the cabin attendant panel) have on the airplane performance?

A. Adjusts the humidifer’s output only.
B. Adjusts CAC power consumption, fuel burn, and increase humidity in the cabin.
C. Adjusts the equipment cooling air flow.
D. Has no effect on airplant operation or performance.

A

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

39
Q

What is the maximum permitted takeoff and landing pressure altitude.

A. 6,000 feet
B. 8,000 feet
C. 10,000 feet
D. 14,000 feet

A

D. 14,000 feet

40
Q

When are the Pressurization indications displayed on EICAS (other than non-normal situations)?

A. It is always displayed when the aircraft is powered.
B. When the Pressurization synoptic is displayed on any MFD.
C. When the Status page isselected on any MFD.
D. When the Air synoptic is displayed on any MFD.

A

D. When the Air synoptic is displayed on any MFD.

UAL 787 SV Study Questions Nov 23 (13 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions