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36 Cards in this Set
- Front
- Back
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What is the main advantage of a magneto ignition system over a battery ignition system for an aircraft reciprocating engine? |
A magneto has its own source of electrical energy, and doesn't need a battery. |
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What is the function of the capacitor in a magneto? |
The capacitor minimizes arcing at the breaker points |
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What is the significance of the numbers on the distributor of an aircraft magneto? |
The sparking order of the magneto |
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What happens in a magneto ignition system when the ignition switch is placed in the Off position? |
The primary circuit is connected to ground. |
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What is the reason for having a low–tension ignition system on some aircraft?
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Low–tension magnetos are used on aircraft that fly at high altitudes where there is a problem with flashover |
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What is the basic difference between a low–tension magneto and a high–tension magneto? |
The low–tension ignition system has only one coil in the magneto A high–tension magneto produces high voltage in the magneto coil |
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What is meant by an All Weather spark plug?
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A sealed spark plug that has a grommet on the ignition lead |
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What is meant by the reach of a spark plug?
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The length of the threads on the spark plug that screw into the cylinder head. |
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What is the difference between a hot spark plug and a cold spark plug?
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A hot spark plug has a long path for the heat to travel between the nose core insulator. A cold spark plug, the heat has a shorter distance to travel. Cold plugs operate cooler |
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What is checked when a magneto is internally timed?
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Adjusting the breaker points so they will open at the E–gap position |
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Why is it important that the spark plugs be kept in numbered holes in a tray when they are removed from an engine? |
Spark plugs tell a good deal about the internal condition of the cylinders from which they were taken |
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What is the purpose of staggered timing between the two magnetos on an aircraft engine?
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By using staggered timing, the flame caused by the two spark plugs will meet in the center of the piston. |
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In what position should the ignition switch be placed when using a timing light on the magnetos?
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In the Both position. |
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Why is it important that a torque wrench always be used when installing spark plugs in an aircraft engine? |
There is a possibility of a poor seal, and too tight can cause the insulation to crack. |
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Why are pressurized magnetos used on most reciprocating–engine–powered aircraft that fly at high altitudes?
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Pressurized air is a better insulator than less dense air. |
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What type of ignition system is used on most turbine engines?
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High–intensity, intermittent–duty, capacitor discharge ignition systems. |
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What is meant by the E–gap in magneto timing?
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The E–gap position is when the primary current flowing in the magneto coil is the greatest. |
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What kind of gage should be used to measure the electrode gap in aircraft spark plugs?
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A round wire gage. |
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How many igniters are used in most turbine engines?
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Two |
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What are two types of ignition systems used in turbine engines?
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High–voltage systems low–voltage systems. |
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With which type of ignition system is a glow plug igniter used?
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A low–voltage system.
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How is the strength of the magnet in a magneto checked?
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The magneto is put on a test stand and rotated at a specified speed. |
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In what position is the magnet in a magneto when the greatest change in flux density in the coil core takes place? |
It is a few degrees beyond its neutral position. |
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In what position is the magnet in a magneto when the breaker points begin to open?
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In its E–gap position, just a few degrees beyond its neutral position. |
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What malfunction in the ignition system would cause an aircraft reciprocating engine to continue to run after the ignition switch is placed in the Off position? |
The ignition switch is not grounding the magneto primary circuit.
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What turns on the autoignition system in a turbo–prop engine?
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A torque pressure switch |
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What kind of equipment is used to test an ignition harness for a recip enigne? |
electrical leak detector |
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What kind of electric starting system is used on many of the smaller turbine engines?
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Starter–generator
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What happens when the start switch for a turbine with a starter–generator is placed in the START position?
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a. Current flows actuates the ignition exciter |
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What is indicated if the starter relay chatters rather than locks in, when the start switch is placed in the START position?
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Battery voltage is too low |
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Why are air–turbine starters superior to electric starters for large turbine engines?
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They are light weight for the torque they produce |
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Where does an air–turbine starter get its air for starting the engines on a jet transport airplane?
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APU, GPU or from a running engine
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What is the purpose of the shear section in an air–turbine drive shaft?
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If the engine drives the starter to a speed higher than its design speed, the shear section will break and disconnect the starter from the engine |
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What prevents too high an air pressure from overspeeding an air–turbine starter?
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Air shutoff valve |
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Where does an air–turbine starter get its lubricating oil? |
It has a self–contained lube system with the oil held in the starter housing
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What device in an air–turbine starter warns a technician it there are any metal chips or particles in the oil? |
Magnetic chip detectors |
