Certificate > steering : Which of these statements about trimming in a irreversible flight control ?

Question 22-1 : I is incorrect ii is incorrect i is correct ii is correct i is correct ii is incorrect i is incorrect ii is correct

exemple 122 i is incorrect, ii is incorrect. — .irreversible system fully powered system the pilot has no direct connection to the control surface he has no feel so an artificial feel system must be included this system works in parallel to the irreversible servo control unit.reversible system power assisted system similar to the power assisted steering for a car the pilot feel a part of the load he receives assistance from the hydraulic system to move the control surface.here we are talking about an irreversible flight control system.on a conventional aeroplane using an irreversible flight control system e g b737 ng with variable incidence trimming tailplane the trim is achieved by changing the full elevator deflection the zero force position of the control column does not change.for the aileron trim a variable incidence wing system does not exist on commercial airplane you can not 'trim' the wing thus when trimmed the control wheel will be biased to the right or to the left artificially and the zero force position of the control wheel will change i is incorrect, ii is incorrect.

Which of these statements about trimming in a irreversible flight control ?

Question 22-2 : I is correct ii is incorrect i is incorrect ii is incorrect i is correct ii is correct i is incorrect ii is correct

.irreversible system fully powered system the pilot has no direct connection to the control surface he has no feel so an artificial feel system must be included this system works in parallel to the irreversible servo control unit.reversible system power assisted system similar to the power assisted steering for a car the pilot feel a part of the load he receives assistance from the hydraulic system to move the control surface.here we are talking about an irreversible flight control system.on a conventional aeroplane using an irreversible flight control system e g b737 ng with variable incidence trimming tailplane the trim is achieved by changing the full elevator deflection the zero force position of the control column does not change.for the aileron trim a variable incidence wing system does not exist on commercial airplane you can not 'trim' the wing thus when trimmed the control wheel will be biased to the right or to the left artificially and the zero force position of the control wheel will change

Cabin pressure is controlled by ?

Question 22-3 : Delivering a substantially constant flow of air into the cabin and controlling the outflow controlling the flow of air into the cabin with a constant outflow the cabin air re circulation system the cabin air mass flow control inlet valve s

exemple 130 delivering a substantially constant flow of air into the cabin and controlling the outflow. — delivering a substantially constant flow of air into the cabin and controlling the outflow.

During level flight at a constant cabin pressure altitude which could be ?

Question 22-4 : Partially open at the pre set position for take off fully closed until the cabin climbs to a selected altitude fully closed until the cabin descends to a selected altitude

exemple 134 partially open. — 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 partially open.

The cabin pressure is regulated by the ?

Question 22-5 : Outflow valve air cycle machine air conditioning pack cabin inlet airflow valve

exemple 138 outflow 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 outflow valve.

Cabin differential pressure means the pressure difference between ?

Question 22-6 : 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 142 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 22-7 : 8000 ft 4000 ft 10000 ft 6000 ft

exemple 146 8000 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 8000 ft.

Cabin altitude is the ?

Question 22-8 : 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

exemple 150 cabin pressure expressed as altitude. — 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 cabin pressure expressed as altitude.

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

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

The 'cabin differential pressure' is ?

Question 22-10 : 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 158 cabin pressure minus ambient pressure. — cabin pressure minus ambient pressure.

The cabin rate of descent is ?

Question 22-11 : 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

exemple 162 a cabin pressure increase. — 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 a cabin pressure increase.

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

Question 22-12 : 9 psi 3 psi 13 psi 15 psi

exemple 166 9 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 9 psi.

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

Question 22-13 : 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 170 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 22-14 : Engine compressors ram air intakes piston compressors single radial compressors

exemple 174 engine compressors. — engine compressors.

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

Question 22-15 : Humidity purity pressure temperature

exemple 178 humidity. — 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 humidity.

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

Question 22-16 : 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

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

Question 22-17 : Compressor section turbine section fan section by pass ducting

exemple 186 compressor section. — If the engine has a fan then the air will be taken from the compressor not the fan section compressor section.

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

Question 22-18 : 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

A turbo compressor air conditioning system bootstrap system will ?

Question 22-19 : 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

exemple 194 cause a pressure drop as well as an associated temperature drop in the charge air. — 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 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 22-20 : Hot air bled from the compressors hot air bled from the turbines a fuel heater system an electrical heater system

exemple 198 hot air bled from the compressors. — 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 hot air bled from the compressors.

The pack cooling fan provides ?

Question 22-21 : 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

exemple 202 cooling air to the primary and secondary heat exchanger during slow flight and ground operation. — 857.. 858..the ram air inlets have their deflector doors opened because the aircraft is on the ground . 859 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 22-22 : Decreases remains constant increases may exceed the maximum permitted differential unless immediate preventative action is taken

exemple 206 decreases. — Standard pressurisation profil . 860.if cabin altitude rises difference between the red line and the blue line will reduce the differential pressure decreases decreases.

During a normal pressurised climb after take off ?

Question 22-23 : 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 210 cabin pressure decreases more slowly than atmospheric pressure — cabin pressure decreases more slowly than atmospheric pressure

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

Question 22-24 : 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

exemple 214 positive cabin differential pressure at maximum cabin altitude. — 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 positive cabin differential pressure at maximum cabin altitude.

Main cabin temperature is ?

Question 22-25 : 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 218 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 22-26 : 10000 ft 8000 ft 12000 ft 24000 ft

exemple 222 10000 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 10000 ft.

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

Question 22-27 : After the cooling turbine before the heat exchangers before the cooling turbine just after the heat exchangers

exemple 226 after the cooling turbine. — after the cooling turbine.

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

Question 22-28 : 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

exemple 230 p: precools the engine bleed air, s: cools air behind the pack's compressor. — 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 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 22-29 : Unaffected decreased increased dependent on the degree of pressurisation

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

Question 22-30 : 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

exemple 238 cab v/s increase; cab alt increase; delta p decrease. — 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 cab v/s increase; cab alt increase; delta p decrease.

The main function of an air cycle machine is to ?

Question 22-31 : 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

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

Question 22-32 : 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

exemple 246 cold air unit (air cycle machine) arrangement. — 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 cold air unit (air cycle machine) arrangement.

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

Question 22-33 : 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

exemple 250 a decrease in power and an increase in 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 a decrease in power and an increase in exhaust temperature.

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

Question 22-34 : 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

exemple 254 a rate of climb. — 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 a rate of climb.

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

Question 22-35 : 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

exemple 258 a constant mass air flow is permitted through the cabin. — a constant mass air flow is permitted through the cabin.

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

Question 22-36 : 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

exemple 262 the pressure differential would go to the maximum value — 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 the pressure differential would go to the maximum value

Cabin air for a large aeroplane during flight ?

Question 22-37 : Is temperature controlled has a constant oxygen ratio regulated to a preset value has an increased oxygen ratio has a reduced oxygen ratio

exemple 266 is temperature controlled. — is temperature controlled.

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

Question 22-38 : 1 2 and 3 2 4 and 6 1 5 and 6 3 4 and 5

Cabin pressurisation is regulated by the ?

Question 22-39 : Cabin outflow valve s engines' rpm cabin inlet valve s engines' bleed valves

exemple 274 cabin outflow valve(s). — cabin outflow valve(s).

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

Question 22-40 : Freon argon helium bcf

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