2011 Cqt-air Conditioning And Pressurization
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Questions and Answers
- 1.
What is the automatic feature associated with the ACM PACK HOT caution light in a DHC-8 100?
- A.
Temperature is selected to max cool
- B.
All engine bleeds to the pack shut off
- C.
Temperature is selected to max warm
- D.
Pack temperature control valves areclosed
Correct Answer
B. All engine bleeds to the pack shut offExplanation
The correct answer is "All engine bleeds to the pack shut off." This means that when the ACM PACK HOT caution light is activated in a DHC-8 100, all engine bleeds are shut off to the pack. This is an automatic feature that helps prevent overheating of the air conditioning system by stopping the flow of hot air from the engines into the packs. By shutting off the engine bleeds, cooler air can be circulated within the aircraft, ensuring the safety and comfort of the passengers.Rate this question:
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- 2.
What happens when a #1 or #2 BLEED HOT caution light illuminates?
- A.
The pack is shut down
- B.
A full cold override signal is sent
- C.
That bleed is shut off
- D.
Nothing
Correct Answer
C. That bleed is shut offExplanation
When a #1 or #2 BLEED HOT caution light illuminates, it indicates that the bleed air system for the respective engine is overheating. In response to this warning, the bleed air valve for that engine is shut off. This action helps to prevent further damage and potential hazards caused by the overheating. Therefore, the correct answer is "That bleed is shut off."Rate this question:
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- 3.
A FLT COMPT DUCT HOT caution light causes which set of valves to drive to full cool position?
- A.
Diverter Valve (mod 8/0563)
- B.
Pack Temperature Control Valves
- C.
Trim Valves
- D.
None of the above
Correct Answer
C. Trim ValvesExplanation
The correct answer is Trim Valves. When the FLT COMPT DUCT HOT caution light is illuminated, the trim valves are driven to the full cool position. This action helps to regulate the temperature of the compartment duct and prevent it from overheating. The diverter valve and pack temperature control valves are not directly involved in cooling the compartment duct in this scenario.Rate this question:
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- 4.
The AIR COND PACK HOT caution light indicates that excessive temperature is being sensed where?
- A.
Flight Compartment Duct
- B.
Cabin Duct
- C.
Compressor DischargeOvertemperature Sensor
- D.
ACM
Correct Answer
C. Compressor DischargeOvertemperature SensorExplanation
The AIR COND PACK HOT caution light indicates that excessive temperature is being sensed at the Compressor Discharge Overtemperature Sensor. This sensor is responsible for monitoring the temperature of the compressor discharge in the air conditioning system. If the temperature exceeds the safe limit, the caution light will illuminate to alert the crew of the potential issue.Rate this question:
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- 5.
Can the Flight Compartment Fan (pre mod 8/1538) be switched on in flight?
- A.
Yes
- B.
No
Correct Answer
B. NoExplanation
The Flight Compartment Fan (pre mod 8/1538) cannot be switched on in flight.Rate this question:
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- 6.
If a cooler cabin temperature is selected, what will the ACM pack bypass valve do?
- A.
Open
- B.
Close
- C.
Nothing
Correct Answer
B. CloseExplanation
If a cooler cabin temperature is selected, the ACM pack bypass valve will close. This means that the valve will prevent the air conditioning and ventilation system from bypassing the air cycle machine (ACM). By closing the valve, the cooler air from the ACM will be directed into the cabin, helping to maintain the desired temperature.Rate this question:
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- 7.
Can the crew select cabin temp in the "manual" mode while the flight compartment temp controller is in the auto mode?
- A.
Yes
- B.
No
Correct Answer
A. YesExplanation
Yes, the crew can select the cabin temperature in the "manual" mode while the flight compartment temperature controller is in the auto mode. This means that even though the flight compartment temperature is being controlled automatically, the crew still has the ability to manually adjust the temperature in the cabin.Rate this question:
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- 8.
Can pressurization be maintained with only one bleed source available?
- A.
Yes
- B.
No
Correct Answer
A. YesExplanation
Pressurization can be maintained with only one bleed source available because the bleed source is responsible for supplying compressed air to the aircraft's cabin. Even with just one source, the air can still be distributed and regulated to maintain the desired cabin pressure. However, having multiple bleed sources provides redundancy and increases the reliability of the pressurization system.Rate this question:
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- 9.
Is the cargo area pressurized?
- A.
Yes
- B.
No
Correct Answer
A. YesExplanation
The cargo area is pressurized. This means that the air pressure within the cargo area is regulated and kept at a level similar to that of the passenger cabin. This is important to ensure the safety and well-being of any live cargo or sensitive goods that may be transported in the aircraft's cargo area. By maintaining a pressurized environment, the risk of damage to cargo or harm to any living beings is minimized during flight.Rate this question:
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- 10.
Does the pressurization toggle switch have to be in manual for the manual increase knob to work?
- A.
Yes
- B.
No
Correct Answer
B. NoExplanation
The pressurization toggle switch does not have to be in manual for the manual increase knob to work. This means that the manual increase knob can still function even if the pressurization toggle switch is not in the manual position.Rate this question:
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- 11.
What is the difference between the forward outflow selector and the manual increase knob?
- A.
Nothing
- B.
They both open the forward outflowvalve, but the manual increase knob allows a modulated opening
- C.
The forward outflow selector controlsthe forward outflow valve, the manual increase knob controls the aft outflowvalve
- D.
Fwd outflow selector is always active;manual increase knob only activateswith the auto/man/dump switch inmanual
Correct Answer
B. They both open the forward outflowvalve, but the manual increase knob allows a modulated openingExplanation
The correct answer states that both the forward outflow selector and the manual increase knob open the forward outflow valve. However, the manual increase knob allows for a modulated opening, meaning that it can adjust the degree to which the valve is opened. This allows for more precise control over the airflow, whereas the forward outflow selector may only have a fixed opening position.Rate this question:
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- 12.
How is the rear outflow valve powered?
- A.
Suction created by the 18 PSI de-icesystem air flowing through a venturi
- B.
Left Main DC Power
- C.
Ram Air
- D.
Both A & B
Correct Answer
D. Both A & BExplanation
The rear outflow valve is powered by both suction created by the 18 PSI de-icesystem air flowing through a venturi and the Left Main DC Power.Rate this question:
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- 13.
What happens to the rear outflow valve upon touchdown?
- A.
It Opens
- B.
It Closes
Correct Answer
A. It OpensExplanation
Upon touchdown, the rear outflow valve opens. This is because during landing, the aircraft's speed decreases rapidly, causing an increase in air pressure inside the cabin. To equalize this pressure with the outside air pressure, the rear outflow valve opens, allowing excess air to escape from the cabin. Opening the rear outflow valve helps maintain a safe and comfortable cabin environment for the passengers and crew.Rate this question:
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- 14.
What does the "fault" light indicate on the pressurization panel?
- A.
An outflow valve is faulty
- B.
The Air Data Computer is faulty
- C.
The Pressurization Computer isexperiencing a fault or conducting aself test
- D.
None of the above
Correct Answer
C. The Pressurization Computer isexperiencing a fault or conducting aself testExplanation
The "fault" light on the pressurization panel indicates that the Pressurization Computer is experiencing a fault or conducting a self-test. This means that there is a problem with the pressurization system or the computer itself, which may require attention or troubleshooting. It is not related to a faulty outflow valve or Air Data Computer.Rate this question:
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- 15.
What happens when the pressurization toggle switch is selected to the "manual" position?
- A.
The pressurization computer isdeactivated and pressurization isaccomplished by manually modulatingthe rear outflow valve
- B.
The rear outflow valve closes andpressurization is accomplished bymodulating the forward outflow valve
- C.
The rear outflow valve closes andpressurization is accomplished via thecab set switch and alt knob
- D.
None of the above
Correct Answer
B. The rear outflow valve closes andpressurization is accomplished bymodulating the forward outflow valveExplanation
When the pressurization toggle switch is selected to the "manual" position, the rear outflow valve closes and pressurization is accomplished by modulating the forward outflow valve. This means that the pressurization computer is deactivated and the pilot manually adjusts the forward outflow valve to control the cabin pressure.Rate this question:
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- 16.
What occurs when the pressurization toggle switch is selected to the "auto" position?
- A.
The rear outflow valve is closed
- B.
The rear outflow valve is controlled bythe pressurization computer
- C.
The rear outflow valve opens fully
- D.
None of the above
Correct Answer
B. The rear outflow valve is controlled bythe pressurization computerExplanation
When the pressurization toggle switch is selected to the "auto" position, the rear outflow valve is controlled by the pressurization computer. This means that the computer will automatically adjust the position of the rear outflow valve to maintain the desired cabin pressure in the aircraft. The computer continuously monitors the cabin pressure and adjusts the valve accordingly to ensure a comfortable and safe environment for the passengers and crew.Rate this question:
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- 17.
What does the CABIN PRESS warning light indicate?
- A.
That cabin altitude has exceeded 8,000ft.
- B.
That cabin altitude has exceeded10,000 ft.
- C.
That the cabin pressure controller isfaulty
- D.
None of the above
Correct Answer
B. That cabin altitude has exceeded10,000 ft.Explanation
The CABIN PRESS warning light indicates that the cabin altitude has exceeded 10,000 ft. This means that the pressure inside the cabin is higher than the recommended level, which can be dangerous for passengers and crew. It is important to address this issue promptly to ensure the safety and comfort of everyone on board.Rate this question:
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- 18.
What is the position of the rear outflow valve when the aircraft is on the ground? (Engines running, bleeds on)
- A.
Open
- B.
Closed
Correct Answer
A. OpenExplanation
When the aircraft is on the ground with engines running and bleeds on, the rear outflow valve is open. This allows for the controlled release of cabin air pressure and helps maintain a comfortable cabin environment. By keeping the valve open, fresh air can enter the cabin, while stale air and any fumes or contaminants can be expelled. This helps ensure proper ventilation and air circulation within the aircraft while on the ground.Rate this question:
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- 19.
When controlling pressurization manually, the manual increase knob should be turned which way to decrease cabin altitude?
- A.
Clockwise
- B.
Counterclockwise
Correct Answer
B. CounterclockwiseExplanation
Turning the manual increase knob counterclockwise will decrease the cabin altitude when controlling pressurization manually. This is because counterclockwise rotation of the knob will reduce the flow of air into the cabin, resulting in a decrease in cabin altitude.Rate this question:
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- 20.
Are both outflow valves capable of automatic pressure relief at 5.8 +/- .15 PSI?
- A.
Yes
- B.
No
Correct Answer
A. YesExplanation
Both outflow valves are capable of automatic pressure relief at 5.8 +/- .15 PSI.Rate this question:
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- 21.
What should the cabin altitude be if you are flying at FL 250?
- A.
5000
- B.
7000
- C.
8000
- D.
1000
Correct Answer
C. 8000Explanation
The correct answer is 8000. When flying at FL 250, the cabin altitude should be set at 8000 feet. This is because FL 250 represents a flight level of 25,000 feet, and the cabin altitude should typically be maintained at a level that is lower than the actual altitude to ensure the comfort and safety of the passengers and crew.Rate this question:
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- 22.
Will the aircraft pressurize with the bleeds off?
- A.
Yes
- B.
No
Correct Answer
B. NoExplanation
The answer is "No" because in order for an aircraft to pressurize, the bleeds need to be on. The bleeds are responsible for supplying the necessary air pressure to the cabin. If the bleeds are off, there will be no source of pressurized air and therefore the aircraft will not be able to pressurize.Rate this question:
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- 23.
What is the cabin rate of change when the rate knob is at the index?
- A.
500 fpm up 500 fpm down
- B.
500 fpm up and 300 fpm down
- C.
300 fpm up and 300 fpm down
- D.
300 fpm up and 500 fpm down
Correct Answer
B. 500 fpm up and 300 fpm downExplanation
The cabin rate of change when the rate knob is at the index is 500 fpm up and 300 fpm down.Rate this question:
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- 24.
How do we change from fully automatic mode to semi-automatic mode for the pressurization system?
- A.
Cab Set/Norm switch to Cab Set,Auto/Man/Dump to Man
- B.
Cab Set/Norm switch to Cab Set
- C.
Cab Set/Norm switch to Norm
- D.
Cab Set/Norm switch to Norm,Manual increase knob, adjust asrequired
Correct Answer
B. Cab Set/Norm switch to Cab SetExplanation
To change from fully automatic mode to semi-automatic mode for the pressurization system, the correct answer is to switch the Cab Set/Norm switch to Cab Set. This switch allows the system to be controlled manually rather than relying on automatic settings.Rate this question:
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- 25.
What does the MIN/MAX rheostat on the bleed control panel do?
- A.
It regulates the pack bypass valves
- B.
It adjusts the temperature levelmaintained by the automatictemperature controller
- C.
It adjusts the amount of air flow to theACM
- D.
It modulates the rear outflow valves
Correct Answer
C. It adjusts the amount of air flow to theACMExplanation
The MIN/MAX rheostat on the bleed control panel adjusts the amount of air flow to the ACM (Air Cycle Machine). This means that it controls the flow of air to the ACM, which is responsible for cooling and pressurizing the aircraft cabin. By adjusting the air flow, the rheostat helps maintain the desired temperature and pressure levels inside the cabin.Rate this question:
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