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Induction ExhaustO&P
| Question | Answer |
|---|---|
| What are some indications of a leak in the induction system? | rough idle, overheat, run rough |
| What type of damage is normally found in the hot section of a turbine engine? | Cracks caused by heat. |
| Describe the automatic and manual operation of the alternate air valve. | pilot operates a mechanic door that operates an electric actuator |
| What can be done to troubleshoot ice control systems? | check the cable for unrestricted travel |
| Explain how a carburetor heat system operates | heat that has circulated around the exhaust system is sent to the carburetor through a duct |
| What is the cause and effect of one kind of induction system ice? | ice builds up around the discharge nozzle because the fuel evaporation causing the temperature to lower |
| Explain the function and operation of one type of supercharging. | a turbocharger increases manifold pressure, it compresses air and sends it through the engine before the fuel metering device |
| Name some indicators of an exhaust leak or methods of detecting exhaust leaks. | sooty black streak on exhaust pipes |
| Explain thrust reverser system operation and some of the main components. | prevents continued forward thrust of the engine and blocks exhaust thrust from going aft |
| Explain the differences between cascade and a mechanical blockage door thrust reverser. | mechanical blockage- clamshell type aerodynamic blockage- translating cowell |
| What are the hazards of exhaust system failure? | carbon monoxide poisoning |
| What are the effects of using improper materials to mark on exhaust system components? | lead and a galvanized mark and scratches can cause cracks and will result in failure |
| What is the function and operation of a turbine engine exhaust nozzle? | directs exhaust gasses |
| Where is the heat taken from that is used to heat the induction air in a reciprocating engine? | From a muff that is installed around some part of the exhaust system. |
| Where does the alternate air come from that is used with a pressure carburetor or a fuel injection system? | From inside the engine cowling. |
| Where does carburetor ice normally form in a carburetor? | In the throat of the carburetor, on and around the throttle valve. |
| Does the application of carburetor heat cause the air-fuel mixture to become richer or to become leaner? | Heated air causes the air-fuel mixture to become richer. |
| What is used to drive most of the external superchargers used on modern reciprocating engines? | Exhaust gases. |
| What controls the speed of a turbocharger compressor? | The amount of exhaust gas that is forced to flow through the turbine |
| What is the danger of operating an aircraft reciprocating engine with too high a carburetor air temperature? | Too high a carburetor air inlet temperature can cause the air-fuel mixture to reach its critical temperature and detonate. |
| What is usually installed in a large reciprocating engine between the turbosupercharger and the carburetor? | intercooler |
| In what position should the carburetor heat control be placed when starting a reciprocating engine? | In the COLD position. |
| How does an engine air inlet vortex destroyer help prevent foreign object damage to the engine? | A high-velocity stream of compressor bleed air is blown out in front of the engine to break up the vortices that form in front of the engine when it is operating at high power on the ground. |
| What is meant by pressure cooling of an aircraft engine? | Air cooling in which air is forced to flow through baffles and cylinder fins by a pressure differential across the engine. |
| What is the purpose of an augmentor tube in the cooling system of an aircraft reciprocating engine? | The augmentor tube uses the velocity of the exhaust gases to produce a low pressure on one side of the engine that helps pull cooling air through it. |
| Where is the highest temperature located in a turbine engine? | At the inlet to the high-pressure turbine. |
| How are the turbine inlet guide vanes and the first-stage turbine blades in some turbine engines cooled? | High-pressure compressor bleed air flows through the hollow guide vanes and hollow turbine blades. |
| Which side of an air-cooled engine cylinder has the greatest amount of cooling fins? | The side of the cylinder in which the exhaust valve is located. |
| What should be done to repair a bent cooling fin in a cast aluminum cylinder head? | It is normally best to leave a bent cast fin alone if it does not restrict the flow of air. |
| What is used in a helicopter to increase the amount of cooling air that flows over the engine cylinders? | A belt-driven fan. |
| How does metallic sodium in an exhaust valve aid in transferring heat? | The sodium melts when the engine is running, and it sloshes up and down as the valve operates, and carries it into the stem so it can be transferred to the cylinder head and dissipated into the air. |
| How is the structure around a turbine engine protected from excessive heat from the engine? | An insulating blanket protects the structure from excessive heat. |
| What is the function of blast tubes that are installed in a pressure cooling system of a reciprocating engine? | These blast tubes direct cooling air to the magnetos and the generator. |
| Of what material is the insulation blanket made that is used to protect the aircraft structure from the heat produced by a turbine engine? | Fiberglass sandwiched between sheets of metal foil. |
| Of what material are most reciprocating engine exhaust components made? | Corrosion-resistant steel. |
| How is the speed of a turbocharger controlled? | By controlling the amount of exhaust gas that flows through the turbine |
| What type of actuator is used to control the position of the turbocharger waste gate? | A hydraulic actuator that uses engine oil pressure to move the piston. |
| How does a power recovery turbine increase the power of a reciprocating engine? | Exhaust-driven velocity turbines are coupled through a hydraulic drive to the engine crankshaft. Energy that would normally be lost is used to drive the turbines, and the turbines assist in turning the crankshaft. |
| How tight should the clamps be tightened that hold sections of a reciprocating engine exhaust system together? | They should not be so tight that they will be damaged when heat expands the exhaust system components. |
| What would be the effect on engine performance of an internal failure of a muffler? | This will increase the exhaust back pressure and cause a loss of engine power. |
| What effect on turbine engine operation is caused by a change in the area of the exhaust nozzle? | Altering the area of the exhaust nozzle affects the compression ratio, the RPM, the mass airflow through the engine, and the EGT. |
| What are two types of thrust reversers that are used with turbojet engines? | Mechanical blockage (clamshell) and aerodynamic blockage (cascade). |
| How does a noise suppressor reduce the amount of noise produced by a turbojet engine? | It breaks up the low-frequency vibrations in the exhaust stream and converts them into higher frequencies. |
| What is the purpose of the ball joints and bellows in the exhaust system of a reciprocating engine? | The ball joints and bellows allow the exhaust system components to change their dimensions without causing any leaks. |
| Why do some supersonic aircraft use a convergent-divergent exhaust duct? | A convergent-divergent exhaust duct controls the gas expansion as it leaves the engine so the gases will produce thrust at supersonic velocities. |
| Why is it important that a lead pencil never be used to mark on an aircraft exhaust system? | The graphite in a lead pencil will infuse into the metal when it gets hot. It makes the metal brittle and likely to crack. |
Created by:
possumslopper2000
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