Rodina Final 2208
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| Which section of a turbine provides high pressure bleed air to an air cycle machine for pressurization and air conditioning? | High Pressure Compressor
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| Turbine engine air used for air conditioning and pressurization is generally called | Bleed air
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| The cabin pressure of an aircraft in flight is maintained at the selected altitude by | controlling the rate at which air leaves the cabin
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| The purpose of the dump valve in a pressurized aircraft is to relieve | all positive pressure from cabin
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| How is the cabin pressure of the pressurized aircraft usually controlled | by an automatic outflow valve that dumps all the pressure in excess of the amount for which it is set
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| on some cabin pressurization systems, pressurization on the ground is restricted by | main landing gear operating switch
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| the cabin pressure control setting has a direct influence upon the | outflow valve operating
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| what component of a pressurized system prevents the cabin altitude from becoming higher than airplane altitude | negative pressure relief valve
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| if the cabin rate of climb is too great, the control should be adjusted to cause the | outflow valve to close faster
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| which prevents sudden loss of pressurization if there is a loss of pressurization source? | delivery air duct check valve
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| the primary function of the cabin pressurization system outflow valve is to | maintain the desired cabin altitude
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| an aircraft pressurization cycle is normally considered to be | one complete series of events or operations that recur regularly
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| which statement best describes cabin differential pressure | difference between the ambient and internal air pressure
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| the cabin pressurization modes of operation are | differential, pressurized, and isobaric
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| a pressurization controller uses | barometric pressure, cabin altitude, and cabin rate of change
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| the purpose of pressurizing aircraft cabin is to | create the proper environment for prevention of hypoxia, andpermit operation at high altitudes
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| in the event of failure of bleed air supply forward of valves, what prevents rapid decompression of the aircraft | SOV
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| if the aircraft takes off from 1500 feet and climbs to and alt of 25k ft with a desired cabin altitude of 7500 ft, what operation is the psi system at 5500 ft? | unpressurized
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| if the aircraft takes off from 1200 feet and climbs to and alt of 15k ft with a desired cabin altitude of 5k ft, what operation is the psi system at 8500 ft? | isobaric
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| if the aircraft takes off from 1200 feet and climbs to and alt of 35k ft with a desired cabin altitude of 6500 ft, what operation is the psi system at 35k ft? | Differential
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| A/C takes of from a field elevation of 1k feet & climbs to 35kft with a desired cabin altitude of 6 ft. Outside atmospheric psi at 1kft is at 14.2psi at 6k ft is 11.8psi & at 35k is 3.46. what would be the required differential prssure at cruise altitude | 8.34
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| if the aircraft takes off from a field elevation of 1k ft with a desired cabin altitude of 6k ft. has a max cabin differential of 5.4 psi what is the max cruising altitude of the aircraft | 20,000 feet
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| if the aircraft has a max cabin differential of 6.75 and takes of from a field elevation of 1k ft with a desired cabin altitude of 8k ft and will be cruising at an altitude of 30k ft what will be the cabin differential if the aircraft climbs 35k ft? | 7.44
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| Usually bleed air from a gas-turbine engine compressor can be safely used for cabin pressurization. Independent cabin condition air machine can be powered by bleed air from an aircraft turbine compressor | Both are true
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| the dump valve is commonly controlled by the | WOW (weight on wheels)
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| the pressure in the cabin of an airplane is usually designated as | Cabin altitude instead of pressure
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| When pressurizing an aircraft on the ground you must | put aircraft in "air mode"
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| At what maximum altitude do we maintain the cabin of transport category aircraft? | 8,000 feet
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| At certain stages, Hypoxia will cause | dizziness, abnormal speech, and unconsciousness
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| What ATA chapter will you find pressurization? | 21
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| Where would you find the regulating governing certification of transport category aircraft? | 14 CFR Part 25
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| The safety valve is operated by a seperate controller | False
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| Outflow vlave on most transport category aircraft are operated by electric motors | True
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| Turbine Bypass | adds cool air to avoid freezing in the water seperator
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| Trim Air/ ACM Bypass | Hottest air in the mixing chamber
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| 35 Degree sensor | in the water separator inlet
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| Water separator | extracts any condensation from the air
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| Expansion Turbine | Last Stage of cooling
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| Primary Heat Exchanger | First stage of cooling
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| Secondary Heat Exchanger | cools air with RAM air before the turbine
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| ACM Compressor | heats and raises psi of the air
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| Bleed Air valve | opens to allow engine compressor air to into system
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| Mixing Chamber | combines air inputs for proper temp into cabin
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| Ram air inlet | coldest air input into the mixing chamber
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| ACM | Air Cycle MAchine
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| ACM oil (specified in AMM) | Servicing the ACM
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| Zone temp controller | adjust air temp into different cabin zones
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| Coalescer Bag | cloth sleeve used to catch water droplets
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| ATA Chapter 21 | Air conditioning/ pressurization
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| ATA Chapter 49 | APU
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| ATA Chapter 36 | Pneumatics
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| ATA Chapter 35 | Oxygen
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| Which 2 aircrafts have "S-Duct"? | 727 and L10-11
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| the function of an APU air inlet plenum is to | stabilize the pressure of the air before it enters the compressor
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| fuel is normally supplied to the APU from | the airplane's main fuel supply
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| an APU is usually rotated during start by | an electric starter
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| when in operation, the speed of an APU occurs when | the bleed air valve is opened
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| fuel scheduling during APU start and under varying pneumatic bleed and electrical loads is maintained | automatically by the APU fuel control system
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| usually, most of the load placed on an APU occurs when | the bleed air valve is opened
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| Frequently, an aircraft's auxiliary power unit (APU) generator | is identical to the engine-driven generators
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| on APUs equipped with free turbine and load compressor, the primary function of the load compressor is to | Provide bleed air for aircraft pneumatic systems
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| When necessary, APU engine cooling before shutdown may be accomplished by | closing the bleed air valve
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| Generally, when maximum APU shaft power is being used in conjunction with pneumatic power | pneumatic loading will be automatically modulated to maintain a safe EGT
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| how pure is aviators oxygen | 99.5%
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| uses a re-breather bag | continuous flow system
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| regulators lower the psi to | 40-75 psi
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| demand type | O2 is delivered when user inhales
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| green | high pressure cylinders
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| high pressure cylinder psi | 1850 psi
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| stenciled on aircraft O2 bottle | Aviators Breathing Oxygen in 1" white lettering
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| lowest psi in cylinder before servicing | 50 psi
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| O2 system containment | Moisture
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| pressure test with water | test to verify serviceability of O2 cylinder
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| controls the amount of O2 flow in a continuous flow mask | Calibrated orifice
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| changes high psi cylinder psi to low system psi | Pressure reducer vavle
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| the diluter is in a diluter demand system | cabin air
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| visual indication of an over psi condition | green blowout plug on fuselage
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| DOT 3AA cylinder hydro test psi | 5/3 of cylinder capacity
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| 3 components of an aircraft O2 system | Cylinder, Mask, and regulator
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| high pressure cylinder psi | 1800-2000 psi
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| portable O2 system used for | short flights above 10,000 feet
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| high storage capacity and low maintenance | chemical O2 advantages
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| not used on commerical flights | LOX
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| vented to the blowout plug | pressure relief valve
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| system in an unpressurized aircraft | continuous flow and pressure demand types
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| the purpose of the airflow metering aneroid assembly is O2 diluter demand regulator | regulate airflow in relation to cabin altitude
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| what to do if the system has a leak | bubble test with special solution
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| tape used to aid in sealing and lubricating threads | teflon
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| in the vapor cycle cooling system, what is the pressure and state of the refrigerant leaving the evaporator | Low Pressure, Vapor
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| in the vapor cycle cooling system, what is the pressure and state of the refrigerant leaving the expansion valve | low pressure, liquid
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| in the vapor cycle cooling system, what is the pressure and state of the refrigerant leaving the condensor | high pressure, liquid
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| in the vapor cycle cooling system, what is the pressure and state of the refrigerant leaving the compressor | high pressure, vapor
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| which component in the vapor cycle system stores the refrigerant | receiver-dryer
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| the expansion valve in the vapor cycle system receives information about the refrigerant temperature and pressure as it leaves which component | evaporator
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| when servicing a vapor cooling system, evacuation is accomplished by using a vacuum. how is the water removed | lowering the pressure, lowering the boiling point and removing vapor
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| a small amount of water in a vapor cooling system can freeze in the receiver-dryer and stop the entire system operation...T/F? | False
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| bubbles in the freon level sight glass indicates | the system needs to be charged
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| in which component of the vapor cooling system does the system give up heat and change the vapor into liquid | condensor
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| what is the ventilating air used for on a combustion heater | carries heat to the places where needed
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| what is combustion air used for on a combustion heater | provides air required to support the flame
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| where does the exhaust from a combustion heater go | overboard
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| the combustion heater gets fuel from | the aircraft fuel tank
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| the ignition system in a combustion heaters is continuous T/F? | True
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| Transport aircraft used combustion heaters T/F? | False
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| if there is not enough airflow to keep combustion going what occurs | the ignition will not be activated
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| when the thermostat reaches the preselected temperature, what occurs | the fuel is shut off to the heater
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| most single light aircraft use which heating system | exhaust shroud heater
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| electric heaters are used on transport category aircraft. T/F? | False
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