A350 ESV Air Systems Practice Test

These questions are part of the practice quiz. Start practicing

• Which is a common troubleshooting step for PACK-related faults?
• What does BOMU stand for?
• Which cargo compartment environmental controls are accessible from the flight deck?
• Which components' status does ECAM help diagnose in relation to the air system?
• What are the main components that condition and distribute air to cabin zones?
• What is the expected approach when a bleed-air leak is suspected?
• What is the main function of the outflow valve in cabin pressurization?
• On the ground or when the differential pressure is less than a predetermined value, what happens to air in the cabin?
• In manual pressurization mode, what must the crew set?
• Which best describes the relationship between bleedless air systems and cabin environmental control on the A350?
• Which statement best captures the core purpose of bleedless air systems on the A350?
• What is the function of mixing units in the ECS?
• With both packs operating, up to what altitude can APU bleed air be used for air conditioning and pressurization?
• An ECAM alert AIR PACK 1 OVHT and the PACK 1 pb FAULT light are illuminated. Per the ECAM procedure, you turn PACK 1 pb OFF. When will the FAULT light go out?
• Under power-up conditions, the status of cabin ventilation on the VENT panel when lights are out is most accurately described as:
• The amber cross line indication in HOT AIR 1 is the normal indication when the valve has been closed with the HOT AIR pushbutton.
• According to the BLEED page, which combo is correct for HP valves, engine bleed valves, and packs?
• How does ram air contribute to cooling when packs need it?
• What is the primary benefit of having two independent bleed detection loops per duct?
• Which of the following conditions will cause a pack valve to close automatically?
• The aircraft is at or below 25,000', and the APU is running. What happens if you select the APU BLEED pb ON?
• In abnormal cabin pressurization, what does the Cabin Pressure Controller primarily adjust to maintain safe conditions?
• Which area is NOT monitored for a bleed leak by the BOMUs?
• True or False: APU bleed air has priority over engine bleed air.
• In the A350 pack system, each pack comprises which components?
• Which ECAM pages would you consult to diagnose faults in the environmental control system (ECS)?
• Why does the bleedless air system concept matter for cabin environment control?
• How does the A350 ECS maintain cabin air quality?
• What does a two-channel ECS architecture provide?
• Which statement is true about trim air valves in relation to cabin temperature?
• The temperature in each zone of the cabin and cockpit is optimized by individual trim air valves, one for each zone.
• In cabin temperature control, setting the CABIN temp selector to PURS SEL allows individual cabin zones to be controlled through which panel?
• During high-load operations, how is cabin air quality preserved?
• T/F: Dual detection loops provide leak detection for the hot air bleed ducts. If one loop fails, leak detection for that duct is no longer available.
• Which statement best describes System 2's role in the CAB PRESS context?
• Where are the main air distribution outlets for the cabin located?
• What happens if one pack's flow-control valve fails to regulate airflow?
• How can you identify a malfunctioning heat exchanger in the packs?
• How is engine-start performed using cross-bleed on the A350?
• Ground verification of ECS performance includes all of the following EXCEPT.
• Which pushbutton will close all the valves below the flotation line in preparation for ditching?
• What is accomplished when the AVNCS EXTRACT pb is selected to OVRD?
• How does the CPC keep cabin pressure stable during different flight phases?
• The trim air system adjusts the temperature of the air in each cockpit and cabin zone by adding hot bleed air to the air from the mixing unit.
• If Pack 2 is inoperative while Pack 1 normal, how many packs are available to supply conditioned air?
• The top-of-climb cabin altitude target is defined by which parameter?
• The A350 has two trim air valves, one for the cockpit and one for the cabin.
• During a cross-bleed start, what controls when the assisting bleed air is delivered?
• Which statement about lavatories and galleys ventilation is correct?
• If PACK 1 fails but PACK 2 remains healthy, how does the system respond?
• How does the ADU help maintain uniform cabin temperatures across zones?
• Which statement best describes the overall goal of the A350 ECS energy efficiency approach?
• Which item is NOT listed as an essential knowledge area for the A350 ESV Air Systems exam?
• According to the CAB PRESS system display page, which statement is shown when the target cabin altitude is manually set to 4,000 feet?
• Which pushbutton enables manual control of the cabin target altitude?
• In which scenario would ram air provide external cooling assistance for packs?
• With the X BLEED selector in AUTO and both engines running, the cross bleed valve should be in which position?
• According to the CARGO AIR COND panel, what is the status of the BULK cargo inlet and outlet isolation valves?
• In normal ECS operation, how is supply air delivered to the cabin from the packs?
• Two amber XXs on the HOT AIR 1 valve indicate an overheat condition in the hot air ducts.
• How would you troubleshoot a discrepancy between cabin temperature setpoint and actual cabin temperature?
• Which design features provide redundancy in the A350 air conditioning system?
• Which topic is NOT listed as an essential knowledge area for the A350 ESV Air Systems exam?
• What is the primary role of the ram air system in the A350 ECS?
• If the pressurization target altitude has been set manually, which mode is the system in?
• Which component is responsible for setting the temperature of the mixing unit by controlling the pack outlet temperature?
• How would a loss of engine bleed affect ECS operation?
• Which panel provides the status of the BULK cargo isolation valves?
• How are air-system faults reset or cleared?
• What sensors feed the CPC?
• What happens if the ECS experiences a complete electrical failure?
• What is the effect of selecting the DITCHING pushbutton?
• In CPC control, besides cabin pressure and differential pressure sensors, what other sensor type is used?
• What would ECAM warning indicate if there is a heat exchanger fault?
• When engine bleed air is not available, which source can supply bleed air to the ECS?
• What is the function of heat exchangers in the packs?
• APU bleed air can be used for air conditioning on the ground only.
• Bleedless air systems influence which core functions on the A350?
• Which operational states involve ram air being used for cooling?
• When does the ram-air circuit operate automatically in normal operation?
• If HP valves are open, engine bleed valves are open, and pack valves are open, what does that indicate about bleed air sources?
• Bleedless ECS humidity control: which statement is true?
• What general maintenance checks are typical for air systems?
• During flight, how does cabin pressurization interact with altitude?
• Why is it important to understand bleedless air systems for the A350?
• How is cabin pressure controlled on the A350?
• With a single pack operating, up to what altitude can APU bleed air be used for air conditioning and pressurization?
• Which of the following statements is true about managing cabin pressurization during an immediate return?
• How is cabin temperature regulated in a bleedless A350 ECS?
• How do you distinguish between a ram air fault and a pack fault during troubleshooting?
• When is the ram-air circuit used to assist cooling?
• The GND indication on the BLEED page indicates what?
• How is overpressure prevented in the cabin?
• During abnormal pressurization, which two controls does the CPC adjust to regulate cabin pressure?
• The pack controller controls the pack outlet temperature to set the temperature of the mixing unit to the lowest cabin zone demand. True or False?
• What would you check first if cabin air feels stuffy but ECAM shows no pack faults?
• What does bleedless architecture mean for the A350 ESV Air Systems?
• If one detection loop fails, the other loop will continue to detect leaks and may trigger an ECAM alert. This reflects which principle?
• Which component regulates cabin pressure with altitude changes?
• Which concept defines the target cabin pressure altitude that the CPC maintains?
• The statement that bleedless air systems ensure reliable operation with electrical power as the primary source for conditioning implies what about energy sources?
• When is ram air used for cooling in addition to the packs?
• A ram air fault on pack cooling can cause which outcomes?
• The amber LDG ELEVN 700 FT value on the CAB PRESS display indicates which of the following?
• In the A350, bleedless air systems help manage pressurization and what other critical function?
• How can cabin temperature and humidity comfort be influenced by flight crew actions?
• What is the key difference between the A350 ECS and traditional bleed-air systems?
• According to the CAB PRESS display page, which system is controlling the pressurization system?
• The PACK indications on the COND system display page show PACK 1 is supplying air while PACK 2 is not supplied with bleed air.
• Which hardware component directly adjusts the outflow valve position to maintain cabin pressure?
• What is the benefit of having two independent air conditioning packs?
• What is the role of the Air Distribution Unit (ADU)?
• How does the bleedless design affect the reliability of cabin environmental control on the A350?
• The amber HOT AIR 1 valve indicates disagreement with the selected position.
• Which air source is used primarily for cooling and ventilation?
• According to the BLEED page, what is the status of the packs?
• What is the purpose of the cross-bleed valve and when is it used?
• What is the role of ECAM in ECS troubleshooting?
• The RAM AIR pushbutton ON opens the RAM air inlet in flight as an alternate method of pressurizing the aircraft if both engine bleed valves fail.
• Which topic is included as an essential knowledge area for the A350 ESV Air Systems exam?
• Which component provides ambient cooling air for the packs' heat exchangers?
• What is the function of the recirculation fans in the cabin air system?
• A clogged heat exchanger would cause which consequence?
• The statement 'Hot air supplied to the packs is initially precooled by external air in the primary heat exchanger' is
• Outline the air-path from bleed source to cabin in simple terms.
• What are the two primary bleed-air sources for the A350 ECS, and what happens if one source is unavailable?
• If the HOT AIR duct indication is blank, the associated hot air valve is closed.
• Which item is NOT listed as part of typical maintenance checks on ECS components?
• Where are ECS-related maintenance or troubleshooting procedures found?
• How does ram air interact with the heat exchangers to cool bleed air?
• Which ECAM indication would most likely appear with a fault in an environmental control pack?
• What is one typical ECAM page area related to air systems?
• How does the A350 handle a PACK 2 fault if PACK 1 is healthy?
• The pressurization controller will automatically return the cabin altitude to the departure field elevation when an immediate return is required.
• Which statement is correct regarding the avionics ventilation system on the A350?
• What is the status of the BULK cargo heater when the switch is shown as off (lights out)?
• How is cabin temperature adjusted for different zones?
• What ECAM indication would you expect for a PACK fault?
• What does OV RD on the AVNCS EXTRACT pushbutton indicate?
• With engines running, the statement that the engine bleed valves have priority over the APU bleed valves is:
• How are zone temperatures set and controlled?
• Which component is primarily responsible for heating or cooling bleed air before cabin delivery?
• Which items are typically displayed on air system ECAM pages?
• Immediately after takeoff from a field at 1,500' MSL, a return to the departure airport is required. Which statement is true regarding pressurization?
• How is the active bleed source chosen when more than one source is available?
• What is the role of the CPC in managing cabin differential pressure?
• If both channels of a pack controller fail, which statement is true?
• How many air conditioning packs does the A350 ESV have, and where are they located?
• Where does the conditioned air come from before mixing with recirculated air?
• What is the primary purpose of the environmental control system on the A350?
• With the APU BLEED pushbutton ON, what conditions must be met for the APU bleed valve to open?
• T/F: Each monitored duct has two independent bleed detection loops. If one loop fails, a leak can still be detected by the other loop, which will trigger an ECAM alert.
• Understanding bleedless air systems supports reliable operation with electrical power as the primary source for conditioning. Which statement best describes this relationship?
• From where does ram air originate to help cooling the packs?
• What is the purpose of cabin air recirculation fans?
• How does ECAM support air-system fault diagnosis?
• What is the role of the cabin altitude setpoint in the air system?
• With both engines running and the X BLEED selector knob in AUTO, what position should the cross bleed valve be in?
• The amber HOT AIR 1 valve indicates that the HOT AIR 1 valve disagrees with the selected position.
• Where is the passenger oxygen system activated and how does it deploy during loss of cabin pressure?
• Which statement best describes the bleedless concept as it relates to cabin environment?
• Within a single pack, which components are present?
• What is the role of mixing units in the ECS air-path?
• With the pressurization panel in the normal (lights-out) mode, rotating the CABIN V/S TRGT knob toward UP or DN will manually change the cabin vertical speed.
• How does the ECS support cabin air quality during high-load conditions?
• On the COND system display, if PACK 1 is supplying air and PACK 2 is not supplied, which statement is true?
• How can APU bleed support the ECS if engine bleed air is not available?
• What ECAM indications would suggest an ECS bleed air or pack fault?
• Which device regulates the outflow valve position and pack supply to maintain cabin pressure?
• According to the CAB PRESS system display page, which statement indicates the target vertical speed has been set manually?
• A PACK FAULT ECAM message indicates a fault in what part of the ECS?
• T/F: In the event a leak is detected by both loops, the affected duct is automatically isolated.
• Which components provide ECS redundancy in case of pack faults?
• What is the general purpose of the air conditioning packs in bleedless architecture?
• The amber cross line indication in HOT AIR 1 is the normal indication when the valve has been closed with the HOT AIR pushbutton.
• Which statement best describes the BLEED page’s presentation of valve statuses?
• Which of the following ducts are monitored by the Bleed and Overheat Monitoring Units (BOMUs) on the A350?
• How does the APU contribute to ECS operation on the A350?
• Which statement best describes APU bleed usage in flight according to the limits?
• APU air can be used for air conditioning and pressurization on the ground and in flight up to 22,500' with both packs operating, and up to 25,000' with a single pack operating.
• Which statement best describes how cabin zone temperature is managed in the A350?
• What is the primary purpose of isolation valves in fault conditions?
• Lifting the RAM AIR guard and turning the RAM AIR pushbutton to ON opens the RAM air inlet in flight as an alternate method of pressurizing the aircraft when both engine bleed valves have failed.
• To diagnose PACK 2 issues, which indicators would you monitor?
• Which pushbutton is used to adjust the cabin vertical speed manually?
• What is the purge function, and when would it be used?
• Cargo bay temperature is controlled how?
• Which pushbutton enables the cabin target altitude to be set manually?
• The BLEED page shows which of the following as a directly displayed parameter?
• What should be verified after isolating a bleed source to address a suspected leak?
• In the A350 ECS, what enables a spare bleed air path to support the other engine if its own bleed is unavailable?
• What is the role of the outflow valve?
• What is the difference between bleed air and ram air in the ECS?
• Which description best describes the A350 pack system?
• How does the A350 energy efficiency strategy apply to its air systems?
• What is the purpose of the differential pressure sensor in air-system control?
• What happens if the outflow valve fails closed?
• According to the lights out VENT panel shown here, what is the status of the cabin fans when power is established on the aircraft?
• Why is cross-bleed start used, and what must be checked before starting?
• How is engine bleed-air isolation achieved during abnormal conditions?
• What is ram air used for in the A350 ECS?
• The bleedless system's importance in the A350 is because it underpins which three linked aspects?
• Which sensors feed the cabin-pressurization controller?
• The primary energy source for conditioning in bleedless air systems is what?
• Cross-bleed is used in ECS operations to do what?
• The HOT AIR valves provide hot air for which of the following?
• How does the ECS support cabin pressurization during descent and landing?
• Which pushbutton enables you to adjust the cabin vertical speed manually?
• What is the purpose of having packs 1 and 2 in the A350 ECS?
• On the BLEED page, what is the status of the crossbleed valve?
• How does the ECS interact with cabin pressurization during abnormal situations?
• What is the purpose of cabin-pressure relief valves?
• The AFT cargo compartment is ventilated, and the temperature can be controlled from the flight deck.
• A bleedless environmental control approach on the A350 means cabin air conditioning is achieved without relying on which of the following?
• What is the function of isolation valves in the bleed-air system?
• During an immediate return, which action is most appropriate regarding pressurization controls?
• During descent, in AUTO mode, cabin altitude is automatically controlled so that:
• Given bleedless systems, which energy source is the primary conditioning source?
• Which statement is correct regarding the climb phase of the cabin pressurization schedule?
• On the ground with engines off, which power source provides electrical power to the packs for cabin conditioning?
• Which valve does not close when the DITCHING pushbutton is selected?
• Which scenario describes isolated fault handling for a failed pack?
• Which statement best describes cabin air recirculation in the ECS?
• The BULK cargo compartment is ventilated, and the temperature can be controlled from the flight deck.
• Which device commands outflow valve position to maintain cabin pressure?
• Which cooling mechanism is used by the A350 ECS as an alternative to engine bleed air?
• In bleedless operation, which loop is responsible for meeting the cabin temperature setpoint?
• If ram air flow is degraded or blocked, what is the most likely effect on pack cooling?
• How is cabin humidity addressed in the A350 bleedless ECS?
• Which statement describes the source of electrical power to the air conditioning packs during normal operation?
• According to the CAB PRESS system display page, which statement is true?
• The temperature in each aircraft zone is maintained by which of the following?
• If both packs are faulted, how could the cabin still be pressurized?
• How is crew oxygen supplied on the A350?
• What is the purpose of pack flow-control valves?
• What is the pack outlet temperature of pack 1?
• In the event of a PACK fault, how is the fault typically indicated and managed?
• In a bleedless system, the management of pressurization is paired with which other function?
• In the ECS, what is the role of recirculated air filtration?
• Cross-bleed is used to: