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 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

Under normal conditions easa cs 25 the cabin pressure altitude is not allowed ?
Question 23-3 : 8000 ft 4000 ft 10000 ft 6000 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

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

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

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

The maximum cabin differential pressure of a pressurised aeroplane operating at ?
Question 23-8 : 9 psi 3 psi 13 psi 15 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

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

In an aircraft air conditioning system the air cannot be treated for ?
Question 23-11 : Humidity purity pressure temperature

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

Engine bleed air used for air conditioning and pressurization in turbo jet ?
Question 23-13 : Compressor section turbine section fan section by pass ducting

In large modern aircraft in the air conditioning system reduction of air ?
Question 23-14 : An expansion turbine a compressor an evaporator a condenser

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

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

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

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

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

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

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

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

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

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

When air is compressed for pressurization purposes the percentage oxygen ?
Question 23-25 : Unaffected decreased increased dependent on the degree of pressurisation

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

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

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

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

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

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

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

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

Cabin pressurisation is regulated by the ?
Question 23-35 : Cabin outflow valve s engines' rpm cabin inlet valve s engines' bleed valves

The type of refrigerant used in a vapour cycle cooling system is ?
Question 23-36 : Freon argon helium bcf

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

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

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

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

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