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Ignition& Starting
O&P(P)
| Question | Answer |
|---|---|
| What is the main advantage of a magneto ignition system over a battery ignition system for an aircraft recip engine? | A magneto has its own source of electrical energy and it is not dependent upon the battery |
| What is an all weather spark plugs | A shielded spark plug that has a recess in the shielding in which a resilient grommet on the ignition lead forms a watertight seal |
| What is meant by the reach of a spark plug | The length of the threads on the spark plug that screw into the cylinder head |
| What is the difference between a hot spark plug and a cold spark plug | A hot spark plug as a long path for the heat to travel between the nose core insulator and the spark plug shell. In a cold spark plug, the heat has a shorter distance to travel, and the spark plug operates cooler than a hot spark plug |
| What is the advantage of fine-wire spark plugs over massive electrode spark plugs | Fine-wire spark plugs have a firing end that is more open than that of a massive electrode spark plug. The open firing end allows the gases that contain lead to be purged from the spark plug so they will not form solid lead contaminates |
| 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. By knowing the cylinder from which each spark plug came, the mechanic can take the proper action when the spark plug indicates such conditions as detona |
| Why is it important that a torque wrench always be used when installing spark plugs in an aircraft engine | If the spark plugs are not put in tight enough, there is the possibility of a poor seal; if they are put in too tight, there is danger of cracking the insulation or damaging the threads on the spark plug |
| What kind of gauge should be used to measure the electrode gap in aircraft spark plugs | A round wire gauge |
| What is a shower of sparks ignition system | An ignition system that uses an induction vibrator to send pulsating DC into a set of retard breaker points on one of the magnetos. This provides a hot and retarded spark for starting the engine |
| What is an impulse coupling, and how does it work | An impulse coupling is a spring-loaded coupling between a magneto shaft and the drive gear inside the engine. When the engine is rotated for staring, the impulse coupling locks the magnet so it cannot turn. The spring in the coupling winds up as the crank |
| What are the three distinct circuits in a magneto system | The magnetic circuit, The primary electrical circuit, and the secondary electrical circuit |
| What are the advantages of a solid-state magneto | No mechanical parts that wear, higher energy spark at low speeds, and no recurring inspection requirements |
| What is the purpose of the FADEC system | FADEC is a digital electronic fuel control for a gas turbine engine that is functioning during all engine operations, hence full authority. It includes the EEC and functions with the flight management computer. FADEC schedules the fuel to the nozzles in s |
| What kind of electric starting system is used on many of the smaller turbine engines | A starter generator |
| Why are air turbine starters superior to electric starters for large turbine engines | They are light weight for the torque they produce |
| Where does an air turbine starter get its air for starting the engines on a jet transport airplane | From an APU, GPU, or from a running engine |
| What prevents too high an air pressure from over speeding an air turbine starter | The air shutoff and regulating valve |
| Where does an air turbine starter get its lubricating oil | It has a self contained lubrication system with the oil held in the starter housing |
| What device inn an air turbine starter warns an aviation mechanic if there are any metal chips or particles in the oil | Magnetic chip detectors warn of any metal contamination in the oil |
| What is the function of the capacitor in a magneto ? | The capacitor minimizes arcing at the breaker points, and it speeds up the collapse of the primary current as the breaker points open |
| What happens in a magneto ignition system when the ignition switch is placed in the OFF position? | The primary circuit is connected to ground |
| What is checked when a magneto is internally timed? | Internally timing a magneto consists of adjusting the breaker points so they will open at the instant the rotating magnet is in its E-gap position, and the distributor rotor is in position to direct the high voltage to cylinder number one |
| In what position should the ignition switch be placed when using a timing light on the magnetos? | Both position |
| What is the E-gap in magneto timing? | The E-gap angle is the position of the rotating magnet where the primary current flowing in the magneto coil is the greatest. The breaker points open when the rotating is in its E-gap position |
| What malfunction in the ignition system would cause an aircraft recip 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 |
| What type of ignition system is used on most turbine engines | High-intensity, intermittent-duty, capacitor discharge ignition system |
| How many igniters are used with most turbine engines | Two |
| What are two types of ignition systems used in turbine engines | High-voltage systems and low-voltage systems |
| With which type of turbine engine ignition system is a glow plug igniter used | Low-voltage system |
| How is the strength of the magnet in a magneto checked | The magneto is put on a test stand and rotated at a specific speed. The breaker points are held open and the primary current is measured. The strength of the magneto determines the amount of primary current |
| 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. When it is this position, the breaker points open and the primary current is interrupted. The flux change in the coil core is the greatest |
| In what position is the magnet in a magneto when the breaker points begin to open | In its E-gap position, just a few degrees beyond its neutral position |
| What happens when the start switch for a turbine engine with a starter-generator is placed in the START position | -Current flows into the starter relay which closes and actuates the ignition excitor -Current flows through the series motor coils of the starter generator and rotates the engine until it starts |
| What happens when the start switch for a turbine engine with the starter-generator is placed in the RUN position | -The starter relay opens, shutting off current to the ignition exciter and the motor windings in the starter-generator -The generator field relay is closed, connecting the voltage regulator to the starter-generator -The output of the generator flows to |
| What is indicated if the starter relay chatters rather than locks in when the start switch is placed in the START position | The battery voltage is too low to supply enough current to hold the relay engaged |
| What is the purpose of the shear section in an air-turbine drive shaft | If the ratchet mechanism fails to release and the engine drives the started to a speed higher than its design speed, the shear section will break and disconnect the starter from the engine |
Created by:
tbarth
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