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The cabin pressure is regulated by the ? [ Support Airworthiness ]

Question 23-1 : Outflow valve air cycle machine air conditioning pack cabin inlet airflow valve

Cabin altitude is the pressure altitude inside the pressurized zone of the fuselage it is expressed in 'altitude' generally in feet rather than with a unit of pressure in hectopascal for example .the cabin pressure is regulated like this .constant inlet flow regulation by air conditioning valves variable output flow action of the relief valves . 853 exemple 123 Outflow valve.Outflow valve.

Cabin differential pressure means the pressure difference between ?

Question 23-2 : Cabin pressure and ambient air pressure cockpit and passenger cabin cabin pressure and ambient air pressure at mean sea level msl actual cabin pressure and selected pressure

exemple 127 Cabin pressure and ambient air pressure.Cabin pressure and ambient air pressure.

Under normal conditions easa cs 25 the cabin pressure altitude is not allowed ?

Question 23-3 : 8000 ft 4000 ft 10000 ft 6000 ft

Pressurisation .cs 25 841 pressurised cabins. a pressurised cabins and compartments to be occupied must be equipped to provide a cabin pressure altitude of not more than 2438 m 8000 ft at the maximum operating altitude of the aeroplane under normal operating conditions if certification for operation over 7620 m 25 000 ft is requested the aeroplane must be able to maintain a cabin pressure altitude of not more than 4572 m 15 000 ft in the event of any reasonably probable failure or malfunction in the pressurisation system exemple 131 8000 ft.8000 ft.

Cabin altitude is the ?

Question 23-4 : Cabin pressure expressed as altitude altitude at maximum differential pressure difference in height between the cabin floor and ceiling flight level at which the aeroplane is flying

Cabin altitude is the pressure altitude inside the pressurized zone of the fuselage it is expressed in 'altitude' generally in feet rather than with a unit of pressure in hectopascal for example .the cabin pressure is regulated like this .constant inlet flow regulation by air conditioning valves variable output flow action of the relief valves exemple 135 Cabin pressure expressed as altitude.Cabin pressure expressed as altitude.

On a modern large pressurized transport aircraft the maximum cabin differential ?

Question 23-5 : 7 9 psi 3 5 psi 13 15 psi 22 psi

exemple 139 7 - 9 psi.7 - 9 psi.

The 'cabin differential pressure' is ?

Question 23-6 : Cabin pressure minus ambient pressure approximately 5 psi at maximum approximately 15 psi at maximum the pressure differential between the air entering and leaving the cabin

exemple 143 Cabin pressure minus ambient pressure.Cabin pressure minus ambient pressure.

The cabin rate of descent is ?

Question 23-7 : A cabin pressure increase a cabin pressure decrease is not possible at constant airplane altitudes always the same as the airplane's rate of descent

As we climb the cabin altitude 'climbs' to 6000ft/8000ft when the aircraft altitude climbs to fl260/fl410 .the cabin pressure is reducing from ground pressure mean 1013 hpa to less than 750 hpa in cruising flight .thus while descending cabin rate of descent is a cabin pressure increase exemple 147 A cabin pressure increase.A cabin pressure increase.

The maximum cabin differential pressure of a pressurised aeroplane operating at ?

Question 23-8 : 9 psi 3 psi 13 psi 15 psi

Typically there will be two gauges in the cockpit one to show the cabin's rate of climb the small one looks like a vsi vertical speed indicator and the other with two needles . one for the inner scale indicates cabin altitude in feet . one for the outer scale indicates differential pressure between cabin and ambient in psi . 855.the value 9 psi must be known this is a common value on jet aircrafts exemple 151 9 psi.9 psi.

The purpose of the pack cooling fans in the air conditioning system is to ?

Question 23-9 : Supply the heat exchangers with cooling air during slow flights and ground operation cool the apu compartment supply the passenger service unit psu with fresh air supply the heat exchangers with cooling air during cruise flight

exemple 155 Supply the heat exchangers with cooling air during slow flights and ground operation.Supply the heat exchangers with cooling air during slow flights and ground operation.

In flight the cabin air for modern airplanes with jet engines is usually ?

Question 23-10 : Engine compressors ram air intakes piston compressors single radial compressors

exemple 159 Engine compressors.Engine compressors.

In an aircraft air conditioning system the air cannot be treated for ?

Question 23-11 : Humidity purity pressure temperature

Modern air conditioning systems will mix the hot and cold air in a more efficient manner thus humidity control systems are not required anymore today we do not treat the air for humidity .water is removed from the conditioned air by the water separator but it is not controlled .more over actual humidity treatements are responsible for the legionary disease and are therefore forbidden in such cases exemple 163 Humidity.Humidity.

In a cabin air conditioning system equipped with a bootstrap the mass air flow ?

Question 23-12 : Secondary heat exchanger outlet to the turbine inlet of the cold air unit turbine outlet of the cold air unit to the primary heat exchanger inlet compressor outlet of the cold air unit to the primary heat exchanger inlet secondary heat exchanger outlet to the compressor inlet of the cold air unit

Bootstrap or turbo compressor uses a primary heat exchanger for pre cooling against the ambient air temperature .the compressor section of the cooling turbine to boost pressure and temperature to provide a significant pressure drop a secondary heat exchanger which also uses outside air as a coolant to remove the unwanted temperature rises across the compressor and the expansion turbine wich extracts work from the air by driving the compressor . 856.the term bootstrap refers to a self sustaining process that proceeds without external help exemple 167 Secondary heat exchanger outlet to the turbine inlet of the cold air unit.Secondary heat exchanger outlet to the turbine inlet of the cold air unit.

Engine bleed air used for air conditioning and pressurization in turbo jet ?

Question 23-13 : Compressor section turbine section fan section by pass ducting

If the engine has a fan then the air will be taken from the compressor not the fan section exemple 171 Compressor section.Compressor section.

In large modern aircraft in the air conditioning system reduction of air ?

Question 23-14 : An expansion turbine a compressor an evaporator a condenser

Bootstrap or turbo compressor uses a primary heat exchanger for pre cooling against the ambient air temperature .the compressor section of the cooling turbine to boost pressure and temperature to provide a significant pressure drop a secondary heat exchanger which also uses outside air as a coolant to remove the unwanted temperature rises across the compressor and the expansion turbine wich extracts work from the air by driving the compressor . 856.the goal of a bootstrap system is to distribute suitable air to the cabin engine bleed air is compressed passed through a heat exchanger cooled and then across an expansion turbine exemple 175 An expansion turbine.An expansion turbine.

A turbo compressor air conditioning system bootstrap system will ?

Question 23-15 : Cause a pressure drop as well as an associated temperature drop in the charge air not affect the charge air pressure increase charge air pressure whilst causing the temperature to drop in the heat exchanger decrease charge air pressure whilst causing the temperature to rise in the heat exchanger

Img856.the goal of a bootstrap system is to distribute suitable air to the cabin engine bleed air is compressed passed through a heat exchanger cooled and then across an expansion turbine exemple 179 Cause a pressure drop as well as an associated temperature drop in the charge air.Cause a pressure drop as well as an associated temperature drop in the charge air.

Cabin heating in a large jet transport aeroplane is obtained from ?

Question 23-16 : Hot air bled from the compressors hot air bled from the turbines a fuel heater system an electrical heater system

Cabin heating in a large jet transport aeroplane is obtained from hot air bled from the compressors via a 'bootstrap' system .bootstrap or turbo compressor uses a primary heat exchanger for pre cooling against the ambient air temperature .the compressor section of the cooling turbine to boost pressure and temperature to provide a significant pressure drop a secondary heat exchanger which also uses outside air as a coolant to remove the unwanted temperature rises across the compressor and the expansion turbine wich extracts work from the air by driving the compressor . 856.the term bootstrap refers to a self sustaining process that proceeds without external help exemple 183 Hot air bled from the compressors.Hot air bled from the compressors.

The pack cooling fan provides ?

Question 23-17 : Cooling air to the primary and secondary heat exchanger during slow flight and ground operation cooling air to the pre cooler air to the eyeball outlets at the passenger service unit psu cooling air to the primary and secondary heat exchanger during cruise

Img857. 858.the ram air inlets have their deflector doors opened because the aircraft is on the ground . 859 exemple 187 Cooling air to the primary and secondary heat exchanger during slow flight and ground operation.Cooling air to the primary and secondary heat exchanger during slow flight and ground operation.

If the cabin altitude rises aircraft in level flight the differential pressure ?

Question 23-18 : Decreases remains constant increases may exceed the maximum permitted differential unless immediate preventative action is taken

Standard pressurisation profil . 860.if cabin altitude rises difference between the red line and the blue line will reduce the differential pressure decreases exemple 191 Decreases.Decreases.

During a normal pressurised climb after take off ?

Question 23-19 : Cabin pressure decreases more slowly than atmospheric pressure the pressurisation system is inoperative until an altitude of 10000 feet is reached the cabin differential pressure is maintained constant absolute cabin pressure increases to compensate for the fall in pressure outside the aircraft

exemple 195 Cabin pressure decreases more slowly than atmospheric pressureCabin pressure decreases more slowly than atmospheric pressure

If the maximum operating altitude of an aeroplane is limited by the pressurized ?

Question 23-20 : Positive cabin differential pressure at maximum cabin altitude negative differential pressure at maximum cabin altitude positive cabin differential pressure at maximum operating ceiling negative cabin differential pressure at maximum operating ceiling

An aircraft may be able to operate at for example fl450 but in order to respect a positive cabin differential pressure cabin pressure minus ambient pressure it could be limited at a lower level .9 0 psi is a comon value for maximum differential pressure on jet aircrafts .it is a positive value .cabin pressure at fl 390 = 10 psi 700 hpa .ambient pressure at fl 390 = 3 psi 200 hpa .differential pressure = cabin pressure ambient pressure = 10 3 = 7 psi .in this example the aircraft may climb to a higher level until it will be limited by the 9 0 psi maximum differential pressure exemple 199 Positive cabin differential pressure at maximum cabin altitude.Positive cabin differential pressure at maximum cabin altitude.

Main cabin temperature is ?

Question 23-21 : Controlled automatically or by flight crew selection not controllable at the maximum cabin differential pressure only controllable at maximum cabin differential pressure controlled by individual passenger

exemple 203 Controlled automatically, or by flight crew selection.Controlled automatically, or by flight crew selection.

A warning device alerts the crew in case of an excessive cabin altitude this ?

Question 23-22 : 10000 ft 8000 ft 12000 ft 24000 ft

Pressurisation .cs 25 841 pressurised cabins. a . b . 6 warning indication at the pilot or flight engineer station to indicate when the safe or pre set pressure differential and cabin pressure altitude limits are exceeded .appropriate warning markings on the cabin pressure differential indicator meet the warning requirement for pressure differential limits and an aural or visual signal in addition to cabin altitude indicating means meets the warning requirement for cabin pressure altitude limits if it warns the flight crew when the cabin pressure altitude exceeds 3048 m 10000 ft exemple 207 10000 ft.10000 ft.

In a turbo compressor air conditioning system bootstrap system the main water ?

Question 23-23 : After the cooling turbine before the heat exchangers before the cooling turbine just after the heat exchangers

exemple 211 After the cooling turbine.After the cooling turbine.

A turbo compressor air conditioning system bootstrap system includes two heat ?

Question 23-24 : P precools the engine bleed air s cools air behind the pack's compressor p warms up engine bleed air s recirculates the cabin air reducing its temperature p warms up engine bleed air s increases the temperature of air originating from the compressor of the pack p cools the engine bleed air s increases the temperature of the air used for air conditioning of cargo compartment animals

Bootstrap or turbo compressor uses a primary heat exchanger for pre cooling against the ambient air temperature .the compressor section of the cooling turbine to boost pressure and temperature to provide a significant pressure drop a secondary heat exchanger which also uses outside air as a coolant to remove the unwanted temperature rises across the compressor and the expansion turbine wich extracts work from the air by driving the compressor . 856.the term bootstrap refers to a self sustaining process that proceeds without external help exemple 215 P: precools the engine bleed air, s: cools air behind the pack's compressor.P: precools the engine bleed air, s: cools air behind the pack's compressor.

When air is compressed for pressurization purposes the percentage oxygen ?

Question 23-25 : Unaffected decreased increased dependent on the degree of pressurisation

exemple 219 Unaffected.Unaffected.

An aircraft with a pressurized cabin flies at fl 310 and following a ?

Question 23-26 : Cab v/s increase cab alt increase delta p decrease cab v/s decrease cab alt increase delta p decrease cab v/s increase cab alt increase delta p increase cab v/s decrease cab alt decrease delta p increase

If the outflow valve runs to the open position the cabin pressure altitude increases until reaching the outside pressure altitude in normal flight cabin altitude is between 6000 to 8000 ft . 860.if cabin pressure altitude rises difference between the red line and the blue line will reduce the differential pressure decreases exemple 223 Cab v/s increase; cab alt increase; delta p decrease.Cab v/s increase; cab alt increase; delta p decrease.

The main function of an air cycle machine is to ?

Question 23-27 : Cool the bleed air decrease the pressure of the bleed air remove the water from the bleed air pump the conditioned air into the cabin

An air cycle machine is a bootstrap system the goal of a bootstrap system is to distribute suitable air to the cabin engine bleed air is compressed passed through a heat exchanger cooled and then across an expansion turbine exemple 227 Cool the bleed air.Cool the bleed air.

The term 'bootstrap' when used to identify a cabin air conditioning and ?

Question 23-28 : Cold air unit air cycle machine arrangement source of the charge air means by which pressurisation is controlled charge air across the inter cooler heat exchanger

Bootstrap or turbo compressor uses a primary heat exchanger for pre cooling against the ambient air temperature .the compressor section of the cooling turbine to boost pressure and temperature to provide a significant pressure drop a secondary heat exchanger which also uses outside air as a coolant to remove the unwanted temperature rises across the compressor and the expansion turbine wich extracts work from the air by driving the compressor . 856.the term 'bootstrap' refers to a self sustaining process that proceeds without external help and when used to identify a cabin air conditioning and pressurisation system it refers to the whole cold air unit system exemple 231 Cold air unit (air cycle machine) arrangement.Cold air unit (air cycle machine) arrangement.

The selection of bleed air to 'on' will cause ?

Question 23-29 : A decrease in power and an increase in exhaust temperature a decrease in gas generator rpm with no change in power or exhaust temperatures an increase in exhaust temperature gas generator speed and power a reduction of torque and gas generator rpm with an increase of exhaust temperature

Bleed air is compressed air taken from aircraft turbine engines for cabin climate control and systems such as de icing equipment ..bleed air is taken from the compressed air supply before the fuel mixing and is sent to a series of coolers and filters prior to being sent to the passenger cabin .when bleed air is extracted from an engine some power loss will result as well as an increase in exhaust gas temperature . when operating bleed air powered wing heat engine or windshield anti ice systems aircraft performance and engine power settings will change a loss of performance will result there will most likely be a substantial reduction in your maximum takeoff or landing weight if anti ice is used exemple 235 A decrease in power and an increase in exhaust temperature.A decrease in power and an increase in exhaust temperature.

Assuming cabin pressure decreases the cabin rate of climb indicator should ?

Question 23-30 : A rate of climb a rate of descent of approximately 300 feet per minutes zero a rate of descent dependent upon the cabin differential pressure

As we climb the cabin altitude 'climbs' to 6000ft/8000ft when the aircraft altitude climbs to fl260/fl410 .the cabin pressure is reducing from ground pressure mean 1013 hpa to less than 750 hpa in cruising flight .thus while climbing cabin rate of climb is a cabin pressure decrease exemple 239 A rate of climb.A rate of climb.

Assuming cabin differential pressure has attained the required value in normal ?

Question 23-31 : A constant mass air flow is permitted through the cabin the pressurisation system ceases to function until leakage reduces the pressure the outflow valves will move to the fully open position the pressurisation system must be controlled manually

Assume that during cruise flight with airconditioning packs on the outflow ?

Question 23-32 : The pressure differential would go to the maximum value the skin of the cabin would be overstressed the air supply would automatically be stopped the cabin pressure would become equal to the ambient outside air pressure

With packs on and if the outflow valve is closed your airplane will inflate like a balloon .hopefully the pressure safety relief valve will open before damage can occur to the structure . 861.boeing 737 main outflow valve and pressure relief valves exemple 247 The pressure differential would go to the maximum valueThe pressure differential would go to the maximum value

Cabin air for a large aeroplane during flight ?

Question 23-33 : Is temperature controlled has a constant oxygen ratio regulated to a preset value has an increased oxygen ratio has a reduced oxygen ratio

exemple 251 Is temperature controlled.Is temperature controlled.

The purpose of the cabin pressure controller in the automatic mode is to ?

Question 23-34 : 1 2 and 3 2 4 and 6 1 5 and 6 3 4 and 5

exemple 255 1, 2 and 3.1, 2 and 3.

Cabin pressurisation is regulated by the ?

Question 23-35 : Cabin outflow valve s engines' rpm cabin inlet valve s engines' bleed valves

exemple 259 Cabin outflow valve(s).Cabin outflow valve(s).

The type of refrigerant used in a vapour cycle cooling system is ?

Question 23-36 : Freon argon helium bcf

exemple 263 Freon.Freon.

Whilst in level cruising flight an aeroplane with a pressurised cabin ?

Question 23-37 : The differential pressure will rise to its maximum value thus causing the safety relief valves to open a descent must be initiated to prevent the oxygen masks dropping when the cabin altitude reaches 14000 ft the aircraft has to climb to a higher flight level in order to reduce the cabin altitude to its initial value the crew has to intermittently cut off the incoming air flow in order to maintain a zero cabin altitude

The differential pressure will rise to its maximum value thus causing the safety relief valves to open read the question carefully it states a cabin rate of climb of minus 200ft/min the cabin is descending exemple 267 The differential pressure will rise to its maximum value, thus causing the safety relief valves to open.The differential pressure will rise to its maximum value, thus causing the safety relief valves to open.

At reference in a pressurized aircraft whose cabin altitude is 8000 ft a crack ?

Question 23-38 : Fl 230 fl 180 fl 280 fl 340

From the table it can be seen that the pressure at 8000 ft is 10 92 psi.now we've been told because of the crack in the cabin window we can maintain a pressure differential of 5 psi .therefore the air outside can only be 5 psi less than that inside the cabin ie 10 92 5 = 5 92 .again from the table the altitude where we get closest to 5 92 is approximately 23000 ft fl230 exemple 271 Fl 230.Fl 230.

The pressurisation system of an aeroplane ?

Question 23-39 : Has the capability to maintain a cabin pressure higher than ambient pressure only pressurises the flight deck area will maintain a zero cabin differential pressure at all altitudes will maintain a sea level cabin altitude at all altitudes

exemple 275 Has the capability to maintain a cabin pressure higher than ambient pressure.Has the capability to maintain a cabin pressure higher than ambient pressure.

In a turbo compressor air conditioning system bootstrap system the supply of ?

Question 23-40 : Compressed passed through a heat exchanger and then across an expansion turbine passed across an expansion turbine compressed and then passed through a heat exchanger passed across an expansion turbine then directly to the heat exchanger compressed then passed across an expansion turbine and finally across a heat exchanger

The term bootstrap refers to a self sustaining process that proceeds without external help exemple 279 Compressed, passed through a heat exchanger, and then across an expansion turbine.Compressed, passed through a heat exchanger, and then across an expansion turbine.

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