Embraer 190 - Air Management System

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AIR MANAGEMENT SYSTEM QUESTIONS MADE FROM AOM VOL. 2
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Questions and Answers
  • 1. 

    What does "AMS" means?

    Explanation
    "AMS" stands for "air management system." This refers to a system or technology that is used to control and regulate the air quality and flow within a specific environment. It is commonly used in various industries, such as HVAC systems in buildings or aircraft cabin air control systems. The AMS ensures that the air is properly filtered, circulated, and maintained at the desired temperature and humidity levels, providing a comfortable and healthy environment for occupants.

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  • 2. 

    What does "ECS" means?

    Explanation
    "ECS" stands for "Environmental Control System". This system refers to the technology and equipment used to regulate and control the environment within a specific space, such as an aircraft, vehicle, or building. It is responsible for maintaining and adjusting factors like temperature, humidity, air quality, and ventilation to ensure a comfortable and safe environment for occupants or sensitive equipment.

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  • 3. 

    Bleed air is provided to the Air Management System by the engines, or the APU. The bleed air is used for:

    • A.

      Environmental Control System (ECS), engine start, engine and wing anti-ice.

    • B.

      Environmental Control System (ECS), engine and wing anti-ice and water pressurization.

    • C.

      Environmental Control System (ECS), engine start, engine and wing anti-ice and water pressurization.

    Correct Answer
    C. Environmental Control System (ECS), engine start, engine and wing anti-ice and water pressurization.
    Explanation
    Bleed air is used for various purposes in an aircraft's Air Management System. It is used for the Environmental Control System (ECS) to regulate cabin temperature and pressurization. It is also used for engine start, providing the necessary air for ignition. Additionally, bleed air is used for anti-icing, both for the engine and the wings, to prevent ice buildup. Lastly, it is used for water pressurization, ensuring a steady supply of water on board the aircraft.

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  • 4. 

    The engine bleed system alternately selects _____________________________ in order to maintain adequate and safe bleed supply pressure at any engine-operating condition.

    • A.

      High pressure blee source

    • B.

      Low pressure bleed source

    • C.

      Between low pressure and high pressure engine bleed sources

    Correct Answer
    C. Between low pressure and high pressure engine bleed sources
    Explanation
    The engine bleed system selects between low pressure and high pressure engine bleed sources in order to maintain adequate and safe bleed supply pressure at any engine-operating condition. This means that depending on the engine-operating condition, the system will choose the appropriate source of bleed air to ensure that the pressure is maintained at the required level.

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  • 5. 

    The Engine Bleed Valve is commanded open when the following conditions occur simultaneously:

    • A.

      Respective bleed switch is set to AUTO , no fire is detected in the respective engine and no bleed duct leak is detected.

    • B.

      Respective bleed switch is set to AUTO , respective engine bleed is available, no fire is detected in the respective engine and no bleed duct leak is detected.

    Correct Answer
    B. Respective bleed switch is set to AUTO , respective engine bleed is available, no fire is detected in the respective engine and no bleed duct leak is detected.
    Explanation
    The correct answer states that the Engine Bleed Valve is commanded open when the respective bleed switch is set to AUTO, the respective engine bleed is available, no fire is detected in the respective engine, and no bleed duct leak is detected. This means that for the Engine Bleed Valve to open, all of these conditions must occur simultaneously.

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  • 6. 

    The system will automatically shut down the affected bleed system by closing the engine bleed valves when ....

    • A.

      A leak, switch not in AUTO or fail condition is identified.

    • B.

      A leak, overpressure or fail condition is identified.

    • C.

      A leak, overpressure or no pressure available

    Correct Answer
    B. A leak, overpressure or fail condition is identified.
    Explanation
    The correct answer is "a leak, overpressure or fail condition is identified." This means that the system will shut down the affected bleed system if it detects any of these conditions. A leak could indicate a loss of pressure or a potential safety hazard. Overpressure could cause damage to the system or components. A fail condition could indicate a malfunction or failure in the system that needs to be addressed. Shutting down the affected bleed system in these situations helps to prevent further damage or safety risks.

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  • 7. 

    The APU supplies bleed air ...

    • A.

      On the ground only.

    • B.

      Inflight only

    • C.

      On the ground or inflight.

    Correct Answer
    C. On the ground or inflight.
    Explanation
    The APU supplies bleed air on the ground or inflight. This means that the APU can provide bleed air, which is compressed air taken from the engine, to various systems of the aircraft both when it is on the ground and during flight.

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  • 8. 

    The APU Bleed Check Valve __________ engine bleed air from flowing to the APU when the engine bleed is the pneumatic source.

    • A.

      Prevents

    • B.

      Does not prevents

    Correct Answer
    A. Prevents
    Explanation
    The APU Bleed Check Valve prevents engine bleed air from flowing to the APU when the engine bleed is the pneumatic source.

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  • 9. 

    The Engine Bleed #1 will be commanded closed if ...

    • A.

      The cross bleed fails OPEN and the other bleed source is the #2 engine.

    • B.

      The cross bleed fails CLOSE and the other bleed source is the #2 engine.

    Correct Answer
    A. The cross bleed fails OPEN and the other bleed source is the #2 engine.
    Explanation
    The correct answer is "the cross bleed fails OPEN and the other bleed source is the #2 engine." This means that if the cross bleed fails to open and the #2 engine is the only other source of bleed, the Engine Bleed #1 will be commanded closed. This suggests that the cross bleed is the preferred source of bleed, and if it fails to open, the system will switch to the #2 engine as the alternate source.

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  • 10. 

    Normally the overheat sensors use (a) ______ loop sensing. In this configuration an overheat is indicated only when (b) _______ detect an overheat condition.

    • A.

      (a) sinlge / (b) the only loop

    • B.

      (a) dual / (b) both loops

    Correct Answer
    B. (a) dual / (b) both loops
    Explanation
    Overheat sensors normally use dual loop sensing. In this configuration, an overheat is indicated only when both loops detect an overheat condition.

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  • 11. 

    The _____ controller automaticaly selects the bleed source on ground and during flight between the engines, the APU and the external connections.

    • A.

      AMS (Air Management System)

    • B.

      ECS (Environmental Control System)

    Correct Answer
    A. AMS (Air Management System)
    Explanation
    The correct answer is AMS (Air Management System). The AMS controller is responsible for automatically selecting the bleed source on the ground and during flight. It determines whether to use the engines, the APU, or external connections to provide the necessary air supply for various aircraft systems. The ECS (Environmental Control System) is not involved in the selection of the bleed source.

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  • 12. 

    While the airplane is on the ground and with an engine and APU bleed available simultaneously, the AMS gives priority to APU supply bleed when all of the following conditions are met:

    • A.

      The opposite engine bleed pressure is below the minimum for engine start ,ground speed is below 50 kt, the cross bleed valve is operating normally and wing anti-ice is not requested.

    • B.

      The opposite engine bleed pressure is above the minimum for engine start ,ground speed is below 100 kt, the cross bleed valve is operating normally and wing anti-ice is required.

    Correct Answer
    A. The opposite engine bleed pressure is below the minimum for engine start ,ground speed is below 50 kt, the cross bleed valve is operating normally and wing anti-ice is not requested.
    Explanation
    When the airplane is on the ground and both the engine and APU bleed are available, the AMS (Air Management System) prioritizes the APU supply bleed if certain conditions are met. These conditions include the opposite engine bleed pressure being below the minimum for engine start, the ground speed being below 50 kt, the cross bleed valve operating normally, and wing anti-ice not being requested. This means that if all these conditions are fulfilled, the AMS will prioritize the APU supply bleed over the engine bleed.

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  • 13. 

    The APU bleed _________ be used for the anti-ice system operation.

    • A.

      Cannot

    • B.

      Can

    Correct Answer
    A. Cannot
    Explanation
    The APU bleed cannot be used for the anti-ice system operation. This means that the APU bleed air cannot be directed to the anti-ice system to prevent ice formation.

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  • 14. 

    During airborne engine start without Anti-Ice the left engine will be started with the opposite engine if the ________________ is greater than the minimum required for engine start.

    • A.

      APU bleed pressure

    • B.

      Right bleed pressure

    Correct Answer
    B. Right bleed pressure
    Explanation
    During an airborne engine start without Anti-Ice, the left engine will be started with the opposite engine if the right bleed pressure is greater than the minimum required for engine start. This means that if the right bleed pressure is sufficient, it can be used to start the left engine instead of using the APU bleed pressure.

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  • 15. 

    The right engine will be started with the ...

    • A.

      APU bleed air only.

    • B.

      Bleed source that is available at engine start (APU or left engine).

    Correct Answer
    B. Bleed source that is available at engine start (APU or left engine).
    Explanation
    The correct answer is that the right engine will be started with the bleed source that is available at engine start, which could be either the APU or the left engine. This means that the right engine can be started using the bleed air from either of these sources, depending on their availability at the time of engine start.

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  • 16. 

    The AMS gives priority to the Engine supply bleeds when the following conditions are simultaneously met, with the engine and APU bleed available simultaneously:

    • A.

      Engine bleed is available.

    • B.

      The XBLEED valve is operating normally.

    • C.

      ENG REF ECS is selected ON.

    • D.

      All of above.

    Correct Answer
    D. All of above.
    Explanation
    The correct answer is "All of above." This means that when all of the conditions mentioned in the question are simultaneously met, the AMS (Air Management System) gives priority to the Engine supply bleeds. These conditions include the availability of engine bleed, the normal operation of the XBLEED valve, and the selection of ENG REF ECS to ON.

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  • 17. 

    During engine start with Anti-ice, the AMS controller will prioritize cross bleed start.

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    During engine start with Anti-ice, the AMS controller prioritizes cross bleed start. This means that when the anti-ice system is activated, the controller will ensure that the air for starting the engine is taken from the opposite engine, rather than from the APU or ground source. This is done to prevent any potential contamination from the anti-ice system from entering the engine during start-up. Therefore, the statement "During engine start with Anti-ice, the AMS controller will prioritize cross bleed start" is true.

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  • 18. 

    The ____________ ____________ ___________ provides pressurized and conditioned air for the flight deck and passenger cabin, filtered cabin air recirculation, conditioned air supply for gaspers, fan air cooling for avionics and emergency ram air ventilation for flight deck smoke clearance.

    • A.

      Air Management System (AMS)

    • B.

      Environmental Control System (ECS)

    Correct Answer
    B. Environmental Control System (ECS)
    Explanation
    The Environmental Control System (ECS) is responsible for providing pressurized and conditioned air for various purposes in an aircraft. It supplies air for the flight deck and passenger cabin, filters and recirculates cabin air, provides conditioned air for gaspers, cools avionics using fan air, and enables emergency ram air ventilation for flight deck smoke clearance. The ECS plays a crucial role in maintaining a comfortable and safe environment for both the crew and passengers during flight.

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  • 19. 

    The _____ can also provide cargo bay ventilation. The cargo bay ventilation system is optional.

    • A.

      ECS

    • B.

      AMS

    Correct Answer
    A. ECS
    Explanation
    The correct answer is ECS. ECS stands for Environmental Control System, which is responsible for regulating and maintaining the temperature, humidity, and air quality within an aircraft. In addition to providing comfort for passengers and crew, the ECS can also provide cargo bay ventilation if needed. However, the cargo bay ventilation system is optional and not always present in every aircraft.

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  • 20. 

    The AMS controller sets the bleed airflow to each pack independently, through the respective pack _______ ________ _______ (FCV).

    Correct Answer
    flow control valve
    Explanation
    The AMS controller is responsible for regulating the bleed airflow to each pack independently. It achieves this by using the respective pack's flow control valve (FCV). The FCV is a component that controls the amount of airflow allowed into the pack, ensuring that each pack receives the appropriate amount of airflow based on the system's requirements.

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  • 21. 

    Each engine normally supplies bleed air to the respective pack. A single pack is capable of keeping adequate cabin/cargo hold pressurization and temperature. Single engine bleed can supply both ECS packs using the ________ ________ .

    Correct Answer
    cross bleed
    Explanation
    The correct answer is "cross bleed". Cross bleed refers to the process of using bleed air from one engine to supply both environmental control system (ECS) packs. This allows for adequate pressurization and temperature control in the cabin and cargo hold using only one engine's bleed air.

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  • 22. 

    During normal operation, pack 1 adjusts the airflow and flight deck temperature according to the CKPT temperature selector knob position. Pack 2 adjusts the airflow to control passenger cabin temperature according to PAX CABIN selector knob position. 

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    During normal operation, pack 1 adjusts the airflow and flight deck temperature, while pack 2 adjusts the airflow to control passenger cabin temperature. Therefore, the statement that pack 1 adjusts the airflow and flight deck temperature according to the CKPT temperature selector knob position is true.

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  • 23. 

    During normal system operation the gasper shutoff valve remains closed. It automatically opens whenever the gasper air supply exceeds ____ ºC. This prevents hot air from blowing on the passengers during cabin heating.

    • A.

      35°C

    • B.

      45°C

    • C.

      55°C

    Correct Answer
    A. 35°C
    Explanation
    The gasper shutoff valve remains closed during normal system operation to prevent hot air from blowing on the passengers. It automatically opens whenever the gasper air supply exceeds 35°C. This indicates that the valve is designed to open at a temperature of 35°C or higher to ensure passenger comfort and prevent overheating in the cabin.

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  • 24. 

    The trim air system controls the amount of hot bleed air provided from _____ into the mixer for independent control of forward and aft cabin zone temperatures.

    • A.

      Pack 1

    • B.

      Pack 2

    Correct Answer
    B. Pack 2
    Explanation
    The trim air system controls the amount of hot bleed air provided from pack 2 into the mixer for independent control of forward and aft cabin zone temperatures.

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  • 25. 

    The recirculation fans are commanded OFF when:

    • A.

      Both packs are commanded OFF.

    • B.

      During on ground, cabin warm-up mode with the APU as bleed source according to a function of ambient temperature and altitude.

    • C.

      The cargo bay fire signal activates.

    • D.

      One pack is commanded OFF.

    • E.

      The DUMP button is pressed.

    • F.

      Smoke is detected in the recirculation bay.

    Correct Answer(s)
    A. Both packs are commanded OFF.
    B. During on ground, cabin warm-up mode with the APU as bleed source according to a function of ambient temperature and altitude.
    C. The cargo bay fire signal activates.
    E. The DUMP button is pressed.
    F. Smoke is detected in the recirculation bay.
    Explanation
    The recirculation fans are commanded OFF when both packs are commanded OFF, during on ground, cabin warm-up mode with the APU as bleed source according to a function of ambient temperature and altitude, the cargo bay fire signal activates, the DUMP button is pressed, or smoke is detected in the recirculation bay.

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  • 26. 

    The forward e-bay ventilation consists of _____ fans, which provide forced cooling air for # 1 Secondary Power Distribution Assembly (SPDA 1), Emergency Integrated Control Center (EICC) and all other avionics located in this e-bay. The fans draw air from the cockpit and expel air toward the underfloor recirculation bay. A flow sensor is used for fan/flow health monitoring.

    • A.

      Two

    • B.

      Three

    Correct Answer
    B. Three
    Explanation
    The correct answer is "three" because the forward e-bay ventilation system consists of three fans. These fans are responsible for providing forced cooling air to various components, including the Secondary Power Distribution Assembly (SPDA 1), Emergency Integrated Control Center (EICC), and other avionics located in the e-bay. The fans draw air from the cockpit and expel it towards the underfloor recirculation bay. Additionally, a flow sensor is used to monitor the health and performance of the fans and airflow.

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  • 27. 

    The center e-bay ventilation consists of _____ fans, which provide forced cooling air for the center e-bay electronics, Left Integrated Control Center (LICC), Right Integrated Control Center (RICC) and SPDA 2. The fans draw air from the rear cabin return and expel it towards the underfloor recirculation bay. Flow sensors are used for fans/flow health monitoring.

    • A.

      Two

    • B.

      Three

    Correct Answer
    B. Three
    Explanation
    The correct answer is "three" because the center e-bay ventilation system consists of three fans that provide forced cooling air for various components. These fans draw air from the rear cabin return and expel it towards the underfloor recirculation bay. Flow sensors are used to monitor the health of the fans and airflow.

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  • 28. 

    ___ fan is installed in this compartment. Air flowing from passenger cabin provides cooling of the aft e-bay and is expelled towards the underflow recirculation bay.

    • A.

      No

    • B.

      One

    Correct Answer
    A. No
  • 29. 

    The ECS provides ventilation for live animals in the forward cargo bay. This optional system contains a fan on the side of the bay which provides underfloor recirculation air into the bay. The system also contains a _______ at the outlet of the bay that closes in the event of fire and thus preventing halon from leaving the bay. In addition, in the event of fire, the forward cargo compartment fan is commanded OFF to prevent halon from entering the cabin.

    • A.

      Shutoff valve

    • B.

      Check valve

    Correct Answer
    A. Shutoff valve
    Explanation
    The ECS (Environmental Control System) in the forward cargo bay of an aircraft provides ventilation for live animals. It includes a fan that circulates air under the floor of the bay. The system also has a shutoff valve at the outlet of the bay, which closes in case of fire. This prevents halon (a fire suppressant) from escaping the bay. Additionally, in the event of a fire, the fan in the forward cargo compartment is turned off to prevent halon from entering the cabin.

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  • 30. 

    Emergency ram air ventilation is provided in case of ...

    • A.

      Pack shutdown only.

    • B.

      Pack shutdown or for smoke removal.

    Correct Answer
    B. Pack shutdown or for smoke removal.
    Explanation
    Emergency ram air ventilation is provided in case of pack shutdown or for smoke removal. This means that when the pack (air conditioning system) shuts down or there is smoke in the cabin, emergency ram air ventilation is activated. This system provides fresh air to the cabin by bypassing the normal air conditioning system. It ensures that passengers have access to breathable air in case of pack shutdown or smoke in the cabin, maintaining their safety and comfort.

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  • 31. 

    The flight deck pack emergency ram air ventilation valve is commanded OPEN only if both ECS cooling packs are commanded OFF or failed OFF and the plane’s altitude is less than _______ .

    • A.

      25000

    • B.

      15000

    Correct Answer
    A. 25000
    Explanation
    The flight deck pack emergency ram air ventilation valve is only commanded to open if both ECS cooling packs are turned off or have failed to turn off, and the plane's altitude is less than 25000 feet.

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  • 32. 

    An emergency ram air ventilation check valve is provided and does not require electronic control. The emergency ram air check valve will be open whenever the pressure in the ram air circuit is ______ than cabin pressure.

    • A.

      Greater

    • B.

      Lower

    Correct Answer
    A. Greater
    Explanation
    The emergency ram air check valve will be open whenever the pressure in the ram air circuit is greater than cabin pressure. This means that when there is a higher pressure in the ram air circuit compared to the cabin pressure, the check valve will open to allow air to flow into the cabin for ventilation.

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  • 33. 

    During smoke removal, both ECS cooling packs will be commanded OFF and therefore, the flight deck emergency ram air ventilation valve will be commanded ______ .

    • A.

      OPEN

    • B.

      CLOSE

    Correct Answer
    A. OPEN
    Explanation
    During smoke removal, both ECS cooling packs will be commanded OFF, which means that the air conditioning system will not be operating. In order to provide ventilation and fresh air to the flight deck, the flight deck emergency ram air ventilation valve will be commanded OPEN. This allows outside air to enter the aircraft and helps to remove smoke and fumes from the flight deck.

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  • 34. 

    The ECS packs 1 or 2 will be CLOSED if any of the following conditions occur:

    • A.

      A Bleed Air Source is NOT available for the pack.

    • B.

      The respective Pack button is OFF.

    • C.

      A Bleed Air Source is available for the pack.

    • D.

      Any engine is starting and there is weight-on-wheels (both packs close).

    • E.

      The respective engine is starting, there is no weight-on-wheels and the opposite engine is not starting.

    • F.

      Any engine is starting and APU is the bleed source (both packs close).

    • G.

      Respective bleed system duct leak.

    • H.

      Respective packs BIT shutdown failures are present (PACK 1(2) FAIL EICAS message displayed).

    Correct Answer(s)
    A. A Bleed Air Source is NOT available for the pack.
    B. The respective Pack button is OFF.
    D. Any engine is starting and there is weight-on-wheels (both packs close).
    E. The respective engine is starting, there is no weight-on-wheels and the opposite engine is not starting.
    F. Any engine is starting and APU is the bleed source (both packs close).
    G. Respective bleed system duct leak.
    H. Respective packs BIT shutdown failures are present (PACK 1(2) FAIL EICAS message displayed).
    Explanation
    The ECS packs will be closed if any of the following conditions occur: a bleed air source is not available for the pack, the respective pack button is off, any engine is starting and there is weight-on-wheels (both packs close), the respective engine is starting, there is no weight-on-wheels and the opposite engine is not starting, any engine is starting and APU is the bleed source (both packs close), there is a respective bleed system duct leak, or there are respective packs BIT shutdown failures present (PACK 1(2) FAIL EICAS message displayed).

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  • 35. 

    The FADEC may send an ECS OFF signal to the AMS controller, requesting that no bleed is extracted from the engine for the air-conditioning system. The FADEC sets this signal depending on the T/O DATASET input (REF ECS OFF), pressure altitude, flight phase, and engine inoperative detection. The AMS controller disregards the ECS OFF signal when the airplane is above _________ .

    • A.

      5000 ft.

    • B.

      15000 ft.

    • C.

      25000 ft.

    Correct Answer
    B. 15000 ft.
    Explanation
    The FADEC may send an ECS OFF signal to the AMS controller, requesting that no bleed is extracted from the engine for the air-conditioning system. The FADEC sets this signal depending on the T/O DATASET input (REF ECS OFF), pressure altitude, flight phase, and engine inoperative detection. The AMS controller disregards the ECS OFF signal when the airplane is above 15000 ft.

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  • 36. 

    The ECS OFF signal CLOSES the packs during takeoff if any of the following conditions occur:

    • A.

      One engine inoperative and APU bleed is not available;

    • B.

      Thrust levers set to MAX position and APU bleed is not available;

    • C.

      T/O DATASET REF ECS set to OFF on the MCDU and APU bleed is not available;

    • D.

      T/O DATASET REF ECS set to OFF and T/O DATASET REF A/I set to ALL on the MCDU.

    • E.

      All of above.

    Correct Answer
    E. All of above.
    Explanation
    The correct answer is "All of above." This means that if any of the conditions mentioned in the options occur (one engine inoperative and APU bleed is not available, thrust levers set to MAX position and APU bleed is not available, T/O DATASET REF ECS set to OFF on the MCDU and APU bleed is not available, T/O DATASET REF ECS set to OFF and T/O DATASET REF A/I set to ALL on the MCDU), the ECS OFF signal will close the packs during takeoff.

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  • 37. 

    The ECS OFF signal CLOSES both packs during go-around if any of the following conditions occur:

    • A.

      One engine inoperative and APU bleed is not available up to 9700 ft;

    • B.

      Thrust levers set to MAX position and APU bleed is not available;

    • C.

      Thrust levers set to MAX position and Wing Ice Protection System is requested ON.

    • D.

      Thrust levers set to MAX position and APU bleed is available;

    Correct Answer(s)
    A. One engine inoperative and APU bleed is not available up to 9700 ft;
    B. Thrust levers set to MAX position and APU bleed is not available;
    C. Thrust levers set to MAX position and Wing Ice Protection System is requested ON.
    Explanation
    The ECS OFF signal is activated in specific situations during a go-around. These situations include: one engine being inoperative and the APU bleed not being available up to 9700 ft, the thrust levers being set to the MAX position and the APU bleed not being available, and the thrust levers being set to the MAX position and the Wing Ice Protection System being requested ON. These conditions trigger the ECS OFF signal, causing both packs to close.

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  • 38. 

    The packs are recovered if any of the following conditions occur: 

    • A.

      Thrust lever reduction below TO/GA;

    • B.

      The airplane is taking off with two engines operating 500 ft above takeoff field altitude.

    • C.

      The airplane is above 9700 ft, for takeoff fields at 8000 ft or below and one engine inoperative;

    • D.

      The airplane is above 15000 ft, for takeoff fields above 8000 ft and one engine inoperative.

    • E.

      The airplane is above 9700 ft during go around, in case one engine is inoperative.

    • F.

      All of above

    Correct Answer
    F. All of above
    Explanation
    The packs are recovered if any of the following conditions occur: thrust lever reduction below TO/GA, the airplane is taking off with two engines operating 500 ft above takeoff field altitude, the airplane is above 9700 ft for takeoff fields at 8000 ft or below and one engine inoperative, the airplane is above 15000 ft for takeoff fields above 8000 ft and one engine inoperative, and the airplane is above 9700 ft during go around in case one engine is inoperative. Therefore, all of the above conditions must occur for the packs to be recovered.

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  • 39. 

     The CPC has two fully independent automatic channels, which are alternated following each flight. Both channels provide a manual function as backup, enabling the crew to control cabin pressure by directly actuating the _______ ________(OFV) position.

    Correct Answer
    outflow valve
    Explanation
    The CPC (Cabin Pressure Controller) has two automatic channels that alternate after each flight. These channels control the cabin pressure. In case of any issues with the automatic channels, there is a manual backup function available. This backup function allows the crew to directly control the cabin pressure by adjusting the position of the outflow valve. The outflow valve is responsible for regulating the flow of air in and out of the aircraft cabin, maintaining the desired cabin pressure.

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  • 40. 

    The negative pressure relief valve is a spring loaded check valve that works without any electrical power, and is independent of the CPCS. Its function is to protect the airplane structure against damages due to a negative differential pressure. The negative pressure relief valve opens if differential pressure between cabin and surrounding environment exceeds ________ .

    • A.

      -0.5 psi

    • B.

      -1.5 psi

    • C.

      -2.5 psi

    Correct Answer
    A. -0.5 psi
    Explanation
    The negative pressure relief valve opens if the differential pressure between the cabin and the surrounding environment exceeds -0.5 psi. This valve is designed to protect the airplane structure from damages caused by a negative differential pressure. When the pressure difference reaches or exceeds -0.5 psi, the valve automatically opens to equalize the pressure and prevent any potential structural damage.

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  • 41. 

    The positive pressure relief valve is a spring loaded check valve that works without any electrical power, and is independent the CPCS. Its function is to protect the airplane’s structure against damage due to positive overpressure. In case of outflow valve failure, the positive pressure relief valve opens if the pressure differential between cabin and surrounding environment exceeds _______ .

    • A.

      7.6 psi.

    • B.

      8.6 psi.

    • C.

      9.6 psi.

    Correct Answer
    B. 8.6 psi.
    Explanation
    The positive pressure relief valve opens if the pressure differential between the cabin and the surrounding environment exceeds 8.6 psi. This means that if the pressure inside the cabin becomes significantly higher than the pressure outside, the valve will open to release the excess pressure and prevent damage to the airplane's structure.

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  • 42. 

    The static pressure port senses the environmental static pressure and mechanically transmits it to the ______ ______ ______ ______ in order to allow the overpressure relief device to work. The static port is electrically heated to assure there are no obstructions of sensing orifices due to ice accumulation. 

    • A.

      Positive pressure relief valve

    • B.

      Negative pressure relief valve

    Correct Answer
    A. Positive pressure relief valve
    Explanation
    The static pressure port senses the environmental static pressure and mechanically transmits it to the positive pressure relief valve in order to allow the overpressure relief device to work. The static port is electrically heated to assure there are no obstructions of sensing orifices due to ice accumulation.

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  • 43. 

    The CPCS uses the (1) _____________ , the (2) ____________ set by the pilot and the (3) ____________retrieved from the FMS data base to schedule the target cabin altitude and the cabin pressure variation rate.

    • A.

      (1) gross weight / (2) cruise altitude / (3) takeoff field elevation

    • B.

      (1) gross weight / (2) cruise altitude / (3) landing field elevation

    • C.

      (1) ZFW weight / (2) cruise altitude / (3) landing field elevation

    Correct Answer
    B. (1) gross weight / (2) cruise altitude / (3) landing field elevation
    Explanation
    The CPCS uses the gross weight, cruise altitude, and landing field elevation to schedule the target cabin altitude and the cabin pressure variation rate.

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  • 44. 

    If the FMS cruise flight level is set below 37000 ft the nominal differential pressure of ____ psi is used. 

    • A.

      7.8

    • B.

      8.4

    Correct Answer
    A. 7.8
    Explanation
    If the FMS cruise flight level is set below 37000 ft, the nominal differential pressure of 7.8 psi is used.

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  • 45. 

    If either the FMS cruise flight level is set higher than 37000 ft or the airplane is actually flying above 37000 ft the nominal differential pressure switches to ____ psi.

    • A.

      7.8

    • B.

      8.4

    Correct Answer
    B. 8.4
    Explanation
    If either the FMS cruise flight level is set higher than 37000 ft or the airplane is actually flying above 37000 ft, the nominal differential pressure switches to 8.4 psi.

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  • 46. 

    This function is used in the event of emergency evacuation, smoke evacuation or for fast cabin depressurization.

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    This statement is true because the function mentioned is indeed used in emergency situations such as evacuation, smoke evacuation, or rapid cabin depressurization. It implies that there is a specific function or system in place to handle these situations efficiently and quickly.

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  • 47. 

    The DUMP function is activated pushing in the DUMP button on the pressurization panel. SYSTEM OPERATION The CPCS system automatically: 

    • A.

      Sets the ECS packs and recirculation fans to OFF;

    • B.

      Controls the OUT FLOW VALVE to maintain the cabin altitude rate of climb at 2000 ft/min up to 12400 ft.

    • C.

      When the cabin altitude reaches 12400 ft it commands the OUT FLOW VALVE full closed. From this point the cabin altitude rises by natural leak.

    • D.

      Automatically closes OUT FLOW VALVE

    Correct Answer(s)
    A. Sets the ECS packs and recirculation fans to OFF;
    B. Controls the OUT FLOW VALVE to maintain the cabin altitude rate of climb at 2000 ft/min up to 12400 ft.
    C. When the cabin altitude reaches 12400 ft it commands the OUT FLOW VALVE full closed. From this point the cabin altitude rises by natural leak.
    Explanation
    The correct answer explains the system operation of the CPCS (Cabin Pressure Control System). It states that when the DUMP function is activated, the ECS (Environmental Control System) packs and recirculation fans are turned off. Additionally, the OUT FLOW VALVE is controlled to maintain a cabin altitude rate of climb at 2000 ft/min up to 12400 ft. Once the cabin altitude reaches 12400 ft, the OUT FLOW VALVE is commanded to be fully closed, and the cabin altitude then rises naturally due to leaks.

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  • 48. 

    If the cabin altitude is above 12400 ft when the dump is activated, the cabin altitude may be rising due to a normal leak. To achieve a higher rate of climb ...

    • A.

      The manual mode can be used.

    • B.

      The manual mode must not be used.

    Correct Answer
    A. The manual mode can be used.
    Explanation
    If the cabin altitude is above 12400 ft when the dump is activated, it suggests that there may be a normal leak causing the cabin altitude to rise. In this situation, using the manual mode can help achieve a higher rate of climb, possibly to mitigate the effects of the leak and maintain a safe cabin altitude.

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  • 49. 

    Pushing out the DUMP button commands the system back to normal operation opening the _____ packs and turning on the recirculation fan.

    • A.

      ECS

    • B.

      AMS

    Correct Answer
    A. ECS
    Explanation
    Pushing out the DUMP button commands the system back to normal operation, which means it activates the Environmental Control System (ECS) by opening the air packs and turning on the recirculation fan. The ECS is responsible for regulating and maintaining the cabin environment, including temperature, humidity, and air circulation. Therefore, the correct answer is ECS.

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  • 50. 

    The manual mode is activated rotating the pressurization mode selector knob to the MAN position. When manual mode is selected, both channels of the CPCS controller revert to standby state, but only one channel performs the manual operation. The channel selection is ____________ .

    • A.

      Manual

    • B.

      Automatic

    Correct Answer
    B. Automatic
    Explanation
    When the manual mode is activated by rotating the pressurization mode selector knob to the MAN position, both channels of the CPCS controller go into standby state. However, only one channel performs the manual operation. Therefore, the channel selection in this case is automatic, as the system automatically selects one channel to perform the manual operation.

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Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Apr 01, 2024
    Quiz Edited by
    ProProfs Editorial Team
  • May 25, 2011
    Quiz Created by
    Santisfaction
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