AC ENVIRONMENT AND AUXILIARY SYSTEM Flashcards
5 overview topics
BLEED AIR SYSTEMS
ELECTRIC HEATING SYSTEM
EXHAUST SHROUD HEATER
COMBUSTION HEATER
VENTILATING AIR SYSYTEM
Temperatures at high altitudes in which aircraft operate can be well _______.
BELOW 0°F
It is mixed with ambient air, or cabin return air, and distributed throughout the aircraft via ducting
BLEED AIR
Pressurized aircraftthat use air cycleair conditioning systemsmix bleed air with cold air produced WHAT?
AIR CYCLE MACHINE EXPANSION TURBINE
The mixing of air can be done in a variety of ways.
MIXING AIR VALVES
FLOW CONTROL VALVES
SHUTOFF VALVES
VARIOUS CONTROL VALVES CONTROLLED BY SWITCHES IN THE COCKPIT
It uses mini-ejectors in helicopter cabins to combine bleed air with cabin air.
BLEED AIR HEAT SYSTEM
Bleed air heat system use this in helicopter cabins to combine bleed air with cabin air.
MINI-EJECTORS
It is used to heat the aircraft.
ELECTRIC HEATING DEVICE
Electricity flowing through a heating element makes the element warm.
Electricity flowing through a HEATING ELEMENT makes the element warm
It require a significant amount of the aircraft’s generator output, which is better dedicated to the operation of other electrical devices.
ELECTRIC HEATING ELEMENT HEATERS
It is use most single-engine light aircraft to heat the cabin.
EXHAUST SHROUD HEATING SYSTEMS
It is directed into a metal shroud, or jacket, that encases part of the engine’sEXHAUST SYSTEM.
AMBIENT AIR
It is the possibility that exhaust gases could contaminate the cabin air.
EXHAUST SHROUD HEATING SYSTEMS
Even the slightest crack in an exhaust manifold could send enough carbon monoxide into the cabin.
Even the slightest crack in an exhaust manifold could send enough CARBON MONOXIDE into the cabin.
Inspecting for leaks
SOAPY SOLUTION
Frequency of exhaust heat leak detection can be every, in how many hours?
EVERY 100 HOURS
It is slightly modified in a shroud heat configuration
EXHAUST SYSTEM
It is slightly modified in a shroud heat configuration
EXHAUST SYSTEM
It used to increase heat transfer from the exhaust to the ambient air going to the cabin.
NUMEROUS WELDED STUDS
It is used on many small to medium sized aircraft.
AIRCRAFT COMBUSTION HEATER
It is a heat source independent from the aircraft’s engine(s), although it does use fuel from the aircraft’s main fuel system.
AIRCRAFT COMBUSTION HEATER
Those are manufactured by a few different companies that supply the aviation industry.
COMBUSTION HEATER
It is the name of the air that is warmed and sent into the cabin.
VENTILATING AIR
Typically, it comes into the combustion heater through a ram air intake.
VENTILATING AIR
This is a switch positioned to open and close depending on the extension or compression of the main landing gear strut.
SQUAT SWITCH
Aircraft-cooling systems, also called as ____________.
AIR-CONDITIONING SYSTEMS
They are used to reduce the temperature inside an aircraft for crew and passenger comfort.
AIR COOLING SYSTEMS
Two basic methods of reducing the temperature of aircraft
FREON VAPOR - CYCLE MACHINE
AIR -CYCLE MACHINE
It uses the compression and expansion of air to lower the temperature of the cabin air.
AIR -CYCLE MACHINE
It is a closed system using the evaporation and condensation of Freon to remove heat from the cabin interior.
VAPOR - CYCLE MACHINE
It cools the engine/APU bleed air.
PRIMARY HEAT EXCHANGER
It removes the heat of compression of the ACM.
SECONDARY HEAT EXCHANGER
It is the refrigeration unit of the environmental control system (ECS) used in pressurized gas turbine-powered aircraft.
AIR -CYCLE MACHINE
Normally an aircraft has two or three of these ACM.
Normally an aircraft has TWO or THREE of these ACM.
Each ACM and its components are often referred as an _____________.
AIR CONDITIONING PACK
It is used in reciprocating-engine-powered aircraft and in smaller turboprop aircraft that do not make use of air-cycle machines to reduce the cabin interior temperature.
VAPOR-CYCLE AIR-CONDITIONING SYSTEM
It is controlled by the pilot and may incorporate automatic cutout or interrupt systems.
OPERATION OF VAPOR-CYCLE MACHINES
These are used to disengage the refrigerant compressor during demand for high engine power output, such as during takeoff operations or when one engine of a multiengine aircraft has failed.
CUTOUT AND INTERRUPT SYSTEMS
It allows all available power to be used to maintain controllable flight.
INTERRUPTION IN COMPRESSOR OPERATION
The latent heat of vaporization.
HEAT
When a gas is compressed, its temperature increases
WHEN A GAS IS COMPRESSED, ITS TEMPERATURE INCREASES
When the pressure on a gas is decreased, its temperature decreases.
WHEN THE PRESSURE ON A GAS IS DECREASED, ITS TEMPERATURE DECREASES.
A vapor-cycle cooling system takes advantage of these laws of nature using two heat-exchangers to control the temperature of the _______________.
COCKPIT AND CABIN
It works in a fashion similar to the one previously discussed, taking heat from the closed system.
EVAPORATOR
It draws heat from the air and adds it to the closed system.
CONDENSER
It is where the cooling process starts.
COMPRESSOR
It is to push the refrigerant, under pressure, through the entire system.
COMPRESSOR
It is a gas at standard pressure and temperature but becomes a liquid when its pressure is increased sufficiently or when the temperature is reduced to the required level.
REFRIGERANT 12
FREON 12
It is the source of energy required for the operation of the system.
COMPRESSOR
It is essentially a reservoir containing a filter and a desiccant.
RECEIVER-DRYER-FILTER
It is usually located on top of the receiver to allow observation of the fluid flow through the unit.
SIGHT GLASS
If bubbles are seen in the fluid, the system refrigerant is known to be ____________________.
LOW AND REQUIRES REPLENISHMENT
It utilize the same principles of thermodynamics and the same laws of gases involved in vapor-cycle systems.
AIR-CYCLE COOLING SYSTEMS
When a gas (air) is compressed, it becomes heated,
When the pressure is reduced, the gas becomes cooled.
WHEN A GAS (AIR) IS COMPRESSED, IT BECOMES HEATED,
WHEN THE PRESSURE IS REDUCED, THE GAS BECOMES COOLED.
It can be used as a cooling agent.
COLD AIR
