Which of these statements about trimming in a irreversible flight control system of a conventional aeroplane are correct or incorrect I The zero ?
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Which of these statements about trimming in a irreversible flight control system of a conventional aeroplane are correct or incorrect I The zero force position of the control column does not change ?
Cabin pressure is controlled by ?
During level flight at a constant cabin pressure altitude which could be decreased even at this flight level cabin outflow valves are Delivering a substantially constant flow of air into cabin controlling outflow. Cabin altitude the pressure altitude inside pressurized zone of fuselage it expressed in 'altitude' (generally in feet) rather than with a unit of pressure (in hectopascal example) the cabin pressure regulated like this constant inlet flow (regulation air conditioning valves) variable output flow (action of relief valves) . 
The cabin pressure regulated the Delivering a substantially constant flow of air into cabin controlling outflow. Cabin altitude the pressure altitude inside pressurized zone of fuselage it expressed in 'altitude' (generally in feet) rather than with a unit of pressure (in hectopascal example) the cabin pressure regulated like this constant inlet flow (regulation air conditioning valves) variable output flow (action of relief valves) . 
Cabin differential pressure means pressure difference between Cabin pressure ambient air pressure. Cabin altitude the pressure altitude inside pressurized zone of fuselage it expressed in 'altitude' (generally in feet) rather than with a unit of pressure (in hectopascal example) the cabin pressure regulated like this constant inlet flow (regulation air conditioning valves) variable output flow (action of relief valves) . 
Under normal conditions easa cs 25 cabin pressure altitude not allowed to exceed Cabin pressure ambient air pressure. pressurisation cs 25 841 pressurised cabins (a) pressurised cabins compartments to be occupied must be equipped to provide a cabin pressure altitude of not more than 2438 m (8000 ft) at maximum operating altitude of aeroplane under normal operating conditions if certification operation over 7620 m (25 000 ft) requested aeroplane must be able to maintain a cabin pressure altitude of not more than 4572 m (15 000 ft) in event of any reasonably probable failure or malfunction in pressurisation system. Question 22-8
Cabin altitude the Cabin pressure expressed as altitude. Cabin altitude the pressure altitude inside pressurized zone of fuselage it expressed in 'altitude' (generally in feet) rather than with a unit of pressure (in hectopascal example) the cabin pressure regulated like this constant inlet flow (regulation air conditioning valves) variable output flow (action of relief valves). Question 22-9
On a modern large pressurized transport aircraft maximum cabin differential pressure approximately Cabin pressure expressed as altitude. Cabin altitude the pressure altitude inside pressurized zone of fuselage it expressed in 'altitude' (generally in feet) rather than with a unit of pressure (in hectopascal example) the cabin pressure regulated like this constant inlet flow (regulation air conditioning valves) variable output flow (action of relief valves). Question 22-10
The 'cabin differential pressure' Cabin pressure minus ambient pressure. Cabin altitude the pressure altitude inside pressurized zone of fuselage it expressed in 'altitude' (generally in feet) rather than with a unit of pressure (in hectopascal example) the cabin pressure regulated like this constant inlet flow (regulation air conditioning valves) variable output flow (action of relief valves). Question 22-11
The cabin rate of descent A cabin pressure increase. As we climb cabin altitude 'climb to 6000ft/8000ft when aircraft altitude climbs to fl260/fl410 the cabin pressure reducing from ground pressure (mean 1013 hpa) to less than 750 hpa in cruising flight thus while descending cabin rate of descent a cabin pressure increase. Question 22-12
The maximum cabin differential pressure of a pressurised aeroplane operating at fl370 approximately A cabin pressure increase. Typically there will be two gauges in cockpit one to show cabin's rate of climb (the small one looks like a vsi vertical speed indicator) the other with two needles one the inner scale indicates cabin altitude in feet one the outer scale indicates differential pressure between cabin ambient in psi the value 9 psi must be known this a common value on jet aircrafts. Question 22-13
The purpose of pack cooling fans in air conditioning system to Supply heat exchangers with cooling air during slow flights ground operation. Typically there will be two gauges in cockpit one to show cabin's rate of climb (the small one looks like a vsi vertical speed indicator) the other with two needles one the inner scale indicates cabin altitude in feet one the outer scale indicates differential pressure between cabin ambient in psi the value 9 psi must be known this a common value on jet aircrafts. Question 22-14
In flight cabin air modern airplanes with jet engines usually supplied Supply heat exchangers with cooling air during slow flights ground operation. Typically there will be two gauges in cockpit one to show cabin's rate of climb (the small one looks like a vsi vertical speed indicator) the other with two needles one the inner scale indicates cabin altitude in feet one the outer scale indicates differential pressure between cabin ambient in psi the value 9 psi must be known this a common value on jet aircrafts. Question 22-15
In an aircraft air conditioning system air cannot be treated Supply heat exchangers with cooling air during slow flights ground operation. Modern air conditioning systems will mix hot cold air in a more efficient manner thus humidity control systems are not required anymore today we do not treat air humidity water removed from conditioned air the water separator but it not controlled more over actual humidity treatements are responsible the legionary disease are therefore forbidden in such cases. Question 22-16
In a cabin air conditioning system equipped with a bootstrap mass air flow routed via Secondary heat exchanger outlet to turbine inlet of cold air unit. Bootstrap (or turbo compressor) uses a primary heat exchanger (for pre cooling against ambient air temperature) the compressor section of cooling turbine (to boost pressure temperature to provide a significant pressure drop) a secondary heat exchanger (which also uses outside air as a coolant to remove unwanted temperature rises across compressor) the expansion turbine wich extracts work from air driving compressor the term bootstrap refers to a self sustaining process that proceeds without external help. Question 22-17
Engine bleed air used air conditioning and pressurization in turbo jet aeroplanes usually taken from Secondary heat exchanger outlet to turbine inlet of cold air unit. If engine has a fan then air will be taken from compressor not fan section. Question 22-18
In large modern aircraft in air conditioning system reduction of air temperature and pressure achieved An expansion turbine. Bootstrap (or turbo compressor) uses a primary heat exchanger (for pre cooling against ambient air temperature) the compressor section of cooling turbine (to boost pressure temperature to provide a significant pressure drop) a secondary heat exchanger (which also uses outside air as a coolant to remove unwanted temperature rises across compressor) the expansion turbine wich extracts work from air driving compressor the goal of a bootstrap system to distribute suitable air to cabin engine bleed air compressed passed through a heat exchanger (cooled) then across an expansion turbine. Question 22-19
A turbo compressor air conditioning system bootstrap system will Cause a pressure drop as well as an associated temperature drop in charge air. the goal of a bootstrap system to distribute suitable air to cabin engine bleed air compressed passed through a heat exchanger (cooled) then across an expansion turbine. Question 22-20
Cabin heating in a large jet transport aeroplane obtained from Hot air bled from compressors. Cabin heating in a large jet transport aeroplane obtained from hot air bled from compressors via a 'bootstrap' system bootstrap (or turbo compressor) uses a primary heat exchanger (for pre cooling against ambient air temperature) the compressor section of cooling turbine (to boost pressure temperature to provide a significant pressure drop) a secondary heat exchanger (which also uses outside air as a coolant to remove unwanted temperature rises across compressor) the expansion turbine wich extracts work from air driving compressor the term bootstrap refers to a self sustaining process that proceeds without external help. Question 22-21
The pack cooling fan provides Cooling air to primary secondary heat exchanger during slow flight ground operation. the ram air inlets have their deflector doors opened because aircraft on ground . Question 22-22
If cabin altitude rises aircraft in level flight differential pressure Cooling air to primary secondary heat exchanger during slow flight ground operation. Standard pressurisation profil if cabin altitude rises difference between red line the blue line will reduce (the differential pressure decreases). Question 22-23
During a normal pressurised climb after take off Cabin pressure decreases more slowly than atmospheric pressure. Standard pressurisation profil if cabin altitude rises difference between red line the blue line will reduce (the differential pressure decreases). Question 22-24
If maximum operating altitude of an aeroplane limited the pressurized cabin this limitation due to maximum Positive cabin differential pressure at maximum cabin altitude. An aircraft may be able to operate at 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 a comon value maximum differential pressure on jet aircrafts it 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 aircraft may climb to a higher level until it will be limited the 9 0 psi maximum differential pressure. Question 22-25
Main cabin temperature Controlled automatically or flight crew selection. An aircraft may be able to operate at 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 a comon value maximum differential pressure on jet aircrafts it 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 aircraft may climb to a higher level until it will be limited the 9 0 psi maximum differential pressure. Question 22-26
A warning device alerts crew in case of an excessive cabin altitude this warning must be triggered on reaching following altitude Controlled automatically or flight crew selection. pressurisation cs 25 841 pressurised cabins (a) (b) (6) warning indication at pilot or flight engineer station to indicate when safe or pre set pressure differential cabin pressure altitude limits are exceeded appropriate warning markings on cabin pressure differential indicator meet warning requirement pressure differential limits an aural or visual signal (in addition to cabin altitude indicating means) meets warning requirement cabin pressure altitude limits if it warns flight crew when cabin pressure altitude exceeds 3048 m (10000 ft). Question 22-27
In a turbo compressor air conditioning system bootstrap system main water separation unit After cooling turbine. pressurisation cs 25 841 pressurised cabins (a) (b) (6) warning indication at pilot or flight engineer station to indicate when safe or pre set pressure differential cabin pressure altitude limits are exceeded appropriate warning markings on cabin pressure differential indicator meet warning requirement pressure differential limits an aural or visual signal (in addition to cabin altitude indicating means) meets warning requirement cabin pressure altitude limits if it warns flight crew when cabin pressure altitude exceeds 3048 m (10000 ft). Question 22-28
A turbo compressor air conditioning system bootstrap system includes two heat exchangers primary exchanger p and secondary exchanger s the functions of these heat exchangers are as follows P precools engine bleed air s cools air behind pack's compressor. Bootstrap (or turbo compressor) uses a primary heat exchanger (for pre cooling against ambient air temperature) the compressor section of cooling turbine (to boost pressure temperature to provide a significant pressure drop) a secondary heat exchanger (which also uses outside air as a coolant to remove unwanted temperature rises across compressor) the expansion turbine wich extracts work from air driving compressor the term bootstrap refers to a self sustaining process that proceeds without external help. Question 22-29
When air compressed pressurization purposes percentage oxygen content P precools engine bleed air s cools air behind pack's compressor. Bootstrap (or turbo compressor) uses a primary heat exchanger (for pre cooling against ambient air temperature) the compressor section of cooling turbine (to boost pressure temperature to provide a significant pressure drop) a secondary heat exchanger (which also uses outside air as a coolant to remove unwanted temperature rises across compressor) the expansion turbine wich extracts work from air driving compressor the term bootstrap refers to a self sustaining process that proceeds without external help. Question 22-30
An aircraft with a pressurized cabin flies at fl 310 and following a malfunction of pressure controller outflow valve runs to open position given cab v/s cabin rate of climb indication cab alt cabin pressure altitude delta p differential pressurethis will result in a Cab v/s increase cab alt increase delta p decrease. If outflow valve runs to open position cabin pressure altitude increases until reaching outside pressure altitude (in normal flight cabin altitude between 6000 to 8000 ft) if cabin pressure altitude rises difference between red line the blue line will reduce (the differential pressure decreases). Question 22-31
The main function of an air cycle machine to Cab v/s increase cab alt increase delta p decrease. An air cycle machine a bootstrap system the goal of a bootstrap system to distribute suitable air to cabin engine bleed air compressed passed through a heat exchanger (cooled) then across an expansion turbine. Question 22-32
The term 'bootstrap' when used to identify a cabin air conditioning and pressurisation system refers to Cold air unit (air cycle machine) arrangement. Bootstrap (or turbo compressor) uses a primary heat exchanger (for pre cooling against ambient air temperature) the compressor section of cooling turbine (to boost pressure temperature to provide a significant pressure drop) a secondary heat exchanger (which also uses outside air as a coolant to remove unwanted temperature rises across compressor) the expansion turbine wich extracts work from air driving compressor the term 'bootstrap' refers to a self sustaining process that proceeds without external help when used to identify a cabin air conditioning pressurisation system it refers to whole cold air unit system. Question 22-33
The selection of bleed air to 'on' will cause A decrease in power an increase in exhaust temperature. Bleed air compressed air taken from aircraft turbine engines cabin climate control systems such as de icing equipment bleed air taken from compressed air supply before fuel mixing is sent to a series of coolers filters prior to being sent to passenger cabin when bleed air 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 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 used. Question 22-34
Assuming cabin pressure decreases cabin rate of climb indicator should indicate A decrease in power an increase in exhaust temperature. As we climb cabin altitude 'climb to 6000ft/8000ft when aircraft altitude climbs to fl260/fl410 the cabin pressure reducing from ground pressure (mean 1013 hpa) to less than 750 hpa in cruising flight thus while climbing cabin rate of climb a cabin pressure decrease. Question 22-35
Assuming cabin differential pressure has attained required value in normal flight conditions if flight altitude maintained A constant mass air flow permitted through cabin. As we climb cabin altitude 'climb to 6000ft/8000ft when aircraft altitude climbs to fl260/fl410 the cabin pressure reducing from ground pressure (mean 1013 hpa) to less than 750 hpa in cruising flight thus while climbing cabin rate of climb a cabin pressure decrease. Question 22-36
Assume that during cruise flight with airconditioning packs on outflow valve s would close the result would be that The pressure differential would go to maximum value. With packs on if outflow valve closed your airplane will inflate like a balloon! hopefully pressure (safety) relief valve will open before damage can occur to structure boeing 737 main outflow valve pressure relief valves. Question 22-37
Cabin air a large aeroplane during flight Is temperature controlled. With packs on if outflow valve closed your airplane will inflate like a balloon! hopefully pressure (safety) relief valve will open before damage can occur to structure boeing 737 main outflow valve pressure relief valves. Question 22-38
The purpose of cabin pressure controller in automatic mode to perform following functions 1 control of cabin altitude2 control of cabin altitude rate of change 3 limitation of differential pressure 4 balancing aircraft altitude with cabin altitude 5 cabin ventilation 6 keeping a constant differential pressure throughout all flight phases the combination regrouping all correct statements Is temperature controlled. With packs on if outflow valve closed your airplane will inflate like a balloon! hopefully pressure (safety) relief valve will open before damage can occur to structure boeing 737 main outflow valve pressure relief valves. Question 22-39
Cabin pressurisation regulated the Cabin outflow valve(s). With packs on if outflow valve closed your airplane will inflate like a balloon! hopefully pressure (safety) relief valve will open before damage can occur to structure boeing 737 main outflow valve pressure relief valves. Question 22-40
The type of refrigerant used in a vapour cycle cooling system Cabin outflow valve(s). With packs on if outflow valve closed your airplane will inflate like a balloon! hopefully pressure (safety) relief valve will open before damage can occur to structure boeing 737 main outflow valve pressure relief valves.
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