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AIRFRAME ORALS

CHAPTER 14 - CABIN ATMOSPHERE CONTROL SYSTEMS

QuestionAnswer
IS THERE ANY SPECIAL REQUIREMENT AS TO THE TYPE OF OXYGEN USED IN AN AIRCRAFT SYSTEM, AND IF SO, WHAT IS IT? ONLY AVIATOR'S BREATHING OXYGEN SHOULD BE USED.
DESCRIBE THE OPERATING PRINCIPLE OF A CONTINUOUS-FLOW OXYGEN SYSTEM. HIGH-PRESSURE OXYGEN FLOWS FROM THE STORAGE CYLINDER TO A RESSURE REGULATOR WHERE ITS PRESSURE IS REDUCED AND THEN TO THE MASK OUTLETS WHENEVER THE SYSTEM IS TURNED ON.
DESCRIBE THE OPERATING PRINCIPLE OF A PRESSURE-DEMAND OXYGEN SYSTEM. DEMAND SYSTEMS ALLOW O2 TO FLOW FROM THE CYLINDER 2 THE REGULATOR. THEN 2 THE MASK ONLY WHEN THE USER INHALES. PRESSURE-DEMAND SYSTEMS GIVE O2 TO THE MASK @ HIGHER THAN ATMOSPHERIC PRESSURE WHEN USED @ HIGH ALTITUDES, FORCING O2 INTO THE USER'S LUNGS.
WHAT SHOULD BE USED TO PURGE AN OXYGEN SYSTEM OF MOISTURE? OXYGEN, DRY AIR, OR DRY NITROGEN.
WHAT ACTION MUST BE TAKEN WHEN AN OXYGEN SYSTEM HAS BEEN OPEN TO THE ATMOSPHERE? THE SYSTEM MUST BE PURGED OF ANY MOISTURE.
DECRIBE THE SAFETY PRECAUTIONS THAT SHOULD BE OBSERVED WHEN SERVICING OXYGEN SYSTEMS. AVOID ALL CONTACT WITH PETROLEUM-BASED OIL OR GREASE, DON'T SMOKE, KEEP EVERYTHING VERY CLEAN, SERVICE SYSTEMS OUTDOORS IF AT ALL POSSIBLE, AND KEEP THE CAPS ON THE BOTTLES TO PROTECT THE VALVES.
WHAT IS A ROOTS BLOWER? A TYPE OF ENGINE-DRIVEN COMPRESSOR.
NAME TWO DIFFERENT TYPES OF INDEPENDENT CABIN AIR COMPRESSORS. POSITIVE-DISPLACEMENT AND CENTRIFUGAL.
WHAT IS THE SOURCE OF PRESSURIZATION AIR IN MOST JET AIRCRAFT? ENGINE BLEED AIR.
WHAT DEVICE PROVIDES THE PRINCIPLE MEANS OF CONTROLLING CABIN PRESSURE? THE OUTFLOW VALVE.
WHAT UNIT REGULATES THE POSITION OF AN OUTFLOW VALVE? THE CABIN PRESSURE CONTROLLER.
NAME SEVERAL METHODS USED ON RECIPROCATING-ENGINE AIRCRAFT FOR PROVIDING HEATED CABIN AIR. EXHAUST SHROUD HEAT EXCHANGERS, COMBUSTION HEATERS, AND ELECTRIC HEATERS.
WHAT IS THE FUNCTION OF THE VENTILATING AIR IN A COMBUSTION HEATER? VENTILATING AIR TRANSPORTS THE HEAT FROM THE HEATER INTO THE CABIN AND PREVENTS COMBUSTION GASES FROM ENTERING THE CABIN IF THE COMBUSTION CHAMBER DEVELOPS A CRACK.
WHAT ARE THE SOURCES OF VENTILATING AIR IN A COMBUSTION HEATER? RAM AIR IN FLIGHT, A BLOWER ON THE GROUND, OR POSSIBLY A COMPRESSOR IF THE AIRPLANE IS PRESSURIZED
NAME THE BASIC COMPONENTS OF AIR-CYCLE COOLING SYSTEM. THE COMPRESSOR AND EXPANSION TURBINE, HEAT EXCHANGERS, AND VARIOUS VALVES.
DESCRIBE THE BASIC OPERATING PRINCIPLES THAT ALLOW AN AIR-CYCLE SYSTEM TO PRODUCE COOL AIR. HOT ENGINE BLEED AIR IS COOLED IN THE PRIMARY HEAT EXCHANGER, COMPRESSED, THEN ENERGY IS EXTRACTED AND THE PRESSURE IS REDUCED. THIS PRODUCES A LARGE TEMPERATURE DROP.
DESCRIBE THE BASIC OPERATING PRINCIPLES OF A WATER SEPARATOR. COOL, MOIST AIR IS SWIRLED SO THAT WATER DROPLETS ARE SEPARATED BY CENTRIFUGAL FORCE, CAPTURED BY A SOCK, AND DRAINED.
NAME THE PRINCIPLE COMPONENTS OF A VAPOR-CYCLE SYSTEM. A COMPRESSOR, CONDENSER, EXPANSION VALVE, AND AN EVAPORATOR.
IN WHAT SIGNIFICANT WAY IS A VAPOR-CYCLE COOLING SYSTEM DIFFERENT FROM AN AIR-CYCLE SYSTEM? VAPOR-CYCLE SYSTEMS USE A REFRIGERANT LIQUID, USUALLY FREON.
WHY IS OIL ADDED TO THE REFRIGERANT IN A VAPOR-CYCLE AIR CONDITIONING SYSTEM? TO LUBRICATE THE COMPRESSOR.
Created by: brookburns34924
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