Asa preware sistemas

8497. Which section of a turbine engine provides high pressure bleed air to an air cycle machine for pressurization and air-conditioning?. Compressor inlet. C-D inlet compressor duct. Low or high pressure compressor.

8498. At which component in an air-cycle cooling system does air undergo a pressure and temperature drop?. Refrigeration bypass valve. Primary heat exchanger. Expansion turbine.

8501. Turbine engine air used for air-conditioning and pressurization is generally called. bleed air. ram air. compressed air.

8503. The cabin pressure of an aircraft in flight is maintained at the selected altitude by. controlling the air inflow rate. inflating door seals and recirculating conditioned cabin air. controlling the rate at which air leaves the cabin.

8504. What controls the operation of the cabin pressure regulator?. Bleed air pressure. Cabin altitude. compression air pressure.

8505. The basic air-cycle cooling system consists of. ram air source, compressors, and engine bleeds. heaters, coolers, and compressors. a source of compressed air, heat exchangers, and a turbine.

8506. The purpose of the dump valve in a pressurized aircraft is to relieve. all positive pressure from the cabin. a negative pressure differental. pressure in excess of the maximum differental.

8512. What test is used to determine the serviceability of an oxygen cylinder?. Pressure test with nitrogen. Pressure test with manometer. Pressure test with water.

8513. How often should standard weight high-pressure oxygen cylinders be hydrostatically tested?. Every 5 years. Every 4 years. Every 3 years.

8514. To be eligible for recharging, a DOT 3HT oxygen cylinder must have been hydrostatically tested every three years and be retired from service after. 10 years or 5,000 filling cycles. 24 years or 4,380 filling cycles. 15 years or 10,000 filling cycles.

8515. What type of oxygen system uses the rebreather bag-type mask?. Demand. Diluter demand. Continuous flow.

8516. The altitude controller maintains cabin altitude by modulation of the. safety valve. outflow valve. safety and outflow valves.

8517. Hot compressor bleed air operates the conditioned air system on some turbine aircraft, cold air supplied by the. hot air mixing valve. sonic airflow control unit. ram air cycle cooling unit.

8518. For use in pressurized aircraft, which is generally the least complicated and requires the least maintenance?. Chemical oxygen generator systems. high-pressure oxygen systems. Low-pressure oxygen systems.

8519. The main cause of contamination in gaseous oxygen systems is. dust and other airborne particulates. moisture. other atmospheric gases.

8520. Where does the last stage of cooling in an air-cycle air-conditioning system occur?. Secondary heat exchanger. Refrigeration unit compressor. Expansion turbine.

8523. How is the cabin pressure of a pressurized aircraft usually controlled?. By a pressure-sensitive switch that causes the pressurization pump to turn on or off as required. By an automatic outflow valve that dumps all the pressure in excess of the amount for which it is set. By a pressure-sensitive valve that controls the output pressure of the pressurization pump.

8524. Which is considered a good practice concerning the inspection of heating and exhaust systems of aircraft utilizing a jacket around the engine exhaust as a heat source?. Supplement physical inspections with periodic operational carbon monoxide detection tests. All exhaust system component should be removed periodically and their condition determined by the magnetic-particle inspection method. All exhaust system component should be removed and remplaced at each 100-hour inspection period.

8525. On some cabin pressurization systems, pressurization on the ground is restricted by the. negative pressure-relief valve. cabin pressure regulator. main landing gear operated switch.

8526. The cabin pressure control setting has a direct influence upon the. pneumatic system pressure. outflow valve opening. inflow valve opening.

8528. What is the purpose of a mixing valve in a compressor bleed air air-conditioning system?. Distribute conditioned air evenly to all parts of the cabin. Combine ram air with conditioned air. Control the supply of hot, cool, and cold air.

8529. What component of a pressurization system prevents the cabin altitude from becoming higher than airplane altitude?. Negative pressure relief valve. positive pressure relief valve. cabin rate-of-descent control.

8531. If the cabin rate of climb is too great, the control should be adjusted to cause the. cabin compressor speed to decrease. outflow valve to close faster. outflow valve to close slower.

8535. Which prevents a sudden loss of pressurization in the event that there is a loss of the pressurization source?. Delivery air duct check valve. firewall shutoff valve. cabin pressure outflow valve.

8537. The primary function of the cabin pressurization system outflow valve is to. provide protection against overpressurization. maintain the same cabin air pressure at all altitudes. maintain the desired cabin pressure.

8538. One purpose of a jet pump in a pressurization and air-conditioning system is to. provide for augmentation of airflow in some areas of the aircraft. produce a high pressure for operation ot the out-flow valve. assist in the circulation of freon.

8541. The air-cycle cooling system produces cold air by. passing air through cooling coils that contain a refrigerant. extracting heat energy across an expansion turbine. extracting heat energy across a compressor.

8544. An aircraft pressurization cycle is normally considered to be. one take off and one landing. when the fuselage reaches its maximum pressure differential one time. one complete series of events or operations that recur regularly.

8545. Which best describes cabin differential pressure?. Difference between cabin pressure controller setting and actual cabin pressure. Difference between the ambient and internal air pressure. Difference between cabin flight altitude pressure and mean sea level pressure.

8547. The cabin pressurization modes of operation are. differential, unpressurized, and isobaric. isobaric, differential, and maximum differential. ambient, unpressurized, and isobaric.

8548. (1) Usually bleed air from a gas-turbine engine compressor can be safely used for cabin pressurization.|(2) Independent cabin condition air machines (air cycle machine) can be powered by bleed air from an aircraft turbine engine compressor.|Regarding the above statements,. both No. 1 and No. 2 are true. only No. 1 is true. only No. 2 is true.

8549. A pressurization controller uses. barometric pressure, cabin altitude, and cabin rate of change. bleed air pressure, outside air temperature, and cabin rate of climb. cabin rate of climb bleed air volume, and cabin pressure.

8564. When an aircraft's oxygen system has developed a leak, the lines and fittings should be. removed and replaced. bubble tested with a special soap solution manufactured specifically for this purpose. inspected using a special oxygen system dye penetrant.

8565. If oxygen bottle pressure is allowed to drop below a specified minimum, it may cause. moisture to collect in the bottle. the pressure reducer to fail. the automatic altitude control valve to open.

8566. What controls the amount of oxygen delivered to a mask in a continuous-flow oxygen system?. Calibrated orifice. pressure reducing valve. pilot´s regulator.

8567. In the diluter demand oxygen regulator, when does the demand valve operate?. When the diluter control is set at normal. When the user demands 100 percent oxygen. When the user breathes.

8568. The primary difference between aviation breathing oxygen and other types of commercially available compressed oxygen is that. aviation breathing oxygen has a higher percentage of water vapor to help prevent drying of a person's breathing passages and possible dehydration. aviation breathing oxygen has had all the water vapor removed. the other types are usually somewhat less than 99.5 percent pure oxygen.

8569. What is used in some oxygen systems to change high cylinder pressure to low system pressure?. Calibrated fixed orifice. Pressure reducer valve. Diluter demand regulator.

8570. In a high-pressure oxygen system, if the pressure reducer fails, what prevents high-pressure oxygen from entering the system downstream?. Check valve. Manifold control valve. Pressure relief valve.

8571. High-pressure cylinders containing oxygen for aviation use can be identified by their. green color and the words ' BREATHING OXYGEN' stenciled in 1-inch white letters. yellow color and the words 'AVIATOR'S BREATHING OXYGEN' stenciled in 1-inch white letters. green color and the words 'AVIATOR'S BREATHING OXYGEN' stenciled in 1-inch white letters.

8572. (Refer to Figure 14.) One hour after an oxygen system was charged for a leakage check, the oxygen pressure gauge read 460 PSI at 63__degrees__F; 6 hours later the temperature was 51__degrees__F. (A 5 PSI change is the maximum allowable in a 6-hour period.) What pressure gauge readings would be acceptable to remain within the allowable limits?. 455 to 460 PSI. 445 to 450 PSI. 446 to 450 PSI.

8573. An aircraft oxygen bottle may be considered airworthy if it has been hydrostatically tested and identified. with the DOT number and manufacturer stamped on the cylinder near the neck. with the DOT number, serial number and manufacturer stamped on the cylinder near the neck. with the test date, DOT number and serial number stamped on the cylinder near the neck.

8574. In a gaseous oxygen system, which of the following are vented to blow out plugs in the fuselage skin?. Pressure reducer valves. Pressure relief valves. filler shutoff valves.

8575. The purpose of pressurizing aircraft cabins is to|(1) create the proper environment for prevention of hypoxia.|(2) permit operation at high altitudes.|Regarding the above statements,. only No. 1 is true. only No. 2 is true. both No. 1 and No. 2 are true.

8576. (1) Oxygen used in aircraft systems is at least 99.5 percent pure and is practically water free.|(2) Oxygen used in aircraft systems is 99.5 percent pure and is hospital quality.|Regarding the above statements,. only No. 1 is true. both No. 1 and No. 2 are true. neither No. 1 nor No. 2 is true.

8577. Oxygen systems in unpressurized aircraft are generally of the. pressure-demand type only. continuous-flow and pressure-demand types. portable-bottle type only.

8578. The purpose of the airflow metering aneroid assembly found in oxygen diluter demand regulators is to. regulate airflow in relation to oxygen flow when operating in emergency or diluter demand positions. automatically put the regulator in emergency position if the demand valve diaphragm ruptures. regulate airflow in relation to cabin altitude when in diluter demand position.

8579. If a high-pressure oxygen cylinder is to be installed in an airplane, it must meet the specifications of the. National Transportation Safety Board or the Standards of Compressed Gas Cylinders. Department of Transportation. aircraft manufacturer or the cylinder manufacturer.

8580. Before a high-pressure oxygen cylinder is serviced, it must be the correct type and have been. approved by the National Transportation Safety Board. hydrostatically tested within the proper time interval. inspected by a certificated airframe mechanic.

8581. A contaminated oxygen system is normally purged with. nitrogen. oxygen. cmpressed air.

8582. How should you determine the amount of oxygen in a portable, high-pressure cylinder?. Read the pressure gauge mounted on the cylinder. weigh the cylinder and its contents. Measure the pressure at the mask.

8583. What may be used as a lubricant on oxygen system tapered pipe thread connections?. Glycerine. Teflon tape. silicone dielectric compound.

8584. On transport category aircraft what might be an indication of an over pressure event of the aircraft oxygen system?. The green thermal expansion disk missing. The green thermal expansion disk in the cockpit missing. The green thermal expansion disk on the oxygen regulator missing.

8585. Which of the following are characteristic of a chemical or solid state oxygen system?|1. An adjustable oxygen release rate.|2. A volume storage capacity about three times that of compressed oxygen.|3. The system generators are inert below 400__degrees__F even under severe impact.|4. A distribution and regulating system similar to gaseous oxygen systems. 1 & 2. 2 & 3. 3 & 4.

8969. Prior to installation of a pneumatic surface-bonded type deicer boots, on the leading edge of the wing, you should. remove all paint from the area to be covered by the deicer boot. apply adhesive to the back of the deicer boot and landing edge of the wing. apply a silastic compound between the boot and the wing skin.

8970. Which of the following are found in a laminated integral electrically heated windshield system?|1. Autotransformer.|2. Heat control relay.|3. Heat control toggle switch.|4. 24V dc power supply.|5. Indicating light. 2, 3, 4, 5. 1, 2, 3, 5. 1, 2, 4, 5.

8971. What is one check for proper operation of a pitot/static tube heater after replacement?. Voltmeter reading. Ammeter reading. continuity check of system.

8972. What controls the inflation sequence in a pneumatic deicer boot system?. Distributor valve. shuttle valve. vacuum pump.

8973. What is the source of pressure for inflating deicer boots on reciprocating engine aircraft?. Piston-type pump. Vane-type pump. Gear-type pump.

8974. Which of the following regulates the vacuum of the air pump to hold the deicing boots deflated when the pneumatic deicing system is off?. Pressure regulator. Suction relief valve. distributor valve.

8975. What may be used to clean deicer boots?. Soap and water. naphtha. unleaded gasoline or jet A fuel.

8976. Some aircraft are protected against airframe icing by heating the leading edges of the airfoils and intake ducts. When is this type of anti-ice system usually operated during flight?. Whenever icing conditions are first encountered or expected to occur. continuosly while the aircraft is in flight. in symmetric cycles during icing conditions to remove ice as it accumulates.

8977. Which of the following indications occur during a normal operational check of a pneumatic deicer system?. Relatively steady readings on the pressure gauge and fluctuating readings on the vacuum gauge. Fluctuating readings on the pressure gauge and relatively steady readings on the vacuum gauge. pressure and vacuum gauges will fluctuate as the deicer boots inflate and deflate.

8978. What method is usually employed to control the temperature of an anti-icing system using surface combustion heaters?. Thermostats in the cockpit. Heater fuel shutoff valves. Thermo-cycling switches.

8979. What is the purpose of the distributor valve in a deicing system utilizing deicer boots?. To equalize the air pressure to the left and right wings. To sequense the deicer boots inflations symmetrically. To distrubute anti-icing fluid to the deicer boots.

8980. What is the purpose of the oil separator in the pneumatic deicing system?. To protect the deicer boots from oil deterioration. To remove oil from air exhausted from the deicer boots. To prevent an accumulation of oil in the vacuum system.

8981. Where are the heat sensors located on most aircraft with electrically heated windshields?. Imbedded in the glass. attached to the glass. around the glass.

8982. Two possible sources of heat for the operation of a wing thermal anti-icing system are. combustion heater and exhaust gases. first stage of the aircycle turbine and turbo compressor. compressor bleed air and aircraft electrical system.

8983. What maintains normal windshield temperature control in an electrically heated windshield system?. Thermal overheat switches. Thermistors. Electronic amplifiers.

8984. Arcing in an electrically heated windshield panel usually indicates a breakdown in the. temperature-sensing elements. conductive coating. Autotransformers.

8985. Which of the following connects vacuum to the deicer boots when the system is not in operation, to hold the boots tightly against the leading edges in flight?. Vacuum relief valve. Distributor valve. Ejector.

8986. How do deicer boots help remove ice accumulations?. By breaking up ice formations. By preventing the formation of ice. By allowing only a thin layer of ice to build up.

8987. Why are the tubes in deicer boots alternately inflated?. Alternate inflation of deicer boot tubes does not disturb airflow. Alternate inflation of deicer boot tubes keeps disturbance of the airflow to a minimum. Alternate inflation of deicer boot tubes relieves the load on the air pump.

8988. Carburetor icing may be eliminated by which of the following methods?. Ethylene glycol spray and heated induction air. Alcohol spray and heated induction air. Electrically heating air intake, Ethylene glycol spray, or alcohol spray.

8989. Why should a chemical rain repellant not be used on a dry windshield?. It will restrict visibility. It will etch the glass. It will cause glass crazing.

8990. What is the principle characteristic of a windshield pneumatic rain removal system?. An air blast spreads a liquid rain repellant evenly over the windshield that prevents raindrops from clinging to the glass surface. An air blast forms a barrier that prevents raindrops from striking the windshield surface. A pneumatic rain removal system is simply a mechanical windshield wiper system that is powered by pneumatic system pressure.

8991. What mixture may be used as a deicing fluid to remove frost from an aircraft surface?. Methyl ethyl ketone and ethylene glycol. Naphtha and isopropyl alcohol. Ethylene glycol and isopropyl alcohol.

8992. Which of the following is the best means to use when removing wet snow from an aircraft?. Warm water. Hot air. A brush or a squeegee.

8993. What are three methods of anti-icing aircraft windshields?|1. Blanket-type heating system.|2. An electric heating element in the windshield.|3. Heated air circulating system.|4. Hot water system.|5. Windshield wipers and anti-icing fluid.|6. Ribbon-type heating system. 1, 2, 6. 2, 3, 5. 2, 3, 4.

8994. What icing condition may occur when there is no visible moisture present?. Carburetor ice. Inlet ice. Injector ice.

8995. What should be used to melt the ice in a turbine engine if the compressor is immobile because of ice?. Anti-icing fluid. Deicing fluid. Hot air.

8996. What is used as a temperature-sensing element in an electrically heated windshield?. Thermometer. Thermocouple. Thermistor.