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Ignition Elec O&P
| Question | Answer |
|---|---|
| If the ignition switch is in the OFF position but the aircraft engine continues to run, what is the probable cause of the problem? | "P" lead is not grounded |
| During an engine run-up magneto check, what is the range of RPM drop considered to be normal when the mag switch is placed in the LEFT or RIGHT position? | 25-75 RPM's |
| A recip engine either fails to start, fails to idle properly, or has low power and runs unevenly. All of these conditions could be caused by the common defective ignition system part(s)? | Defective or improperly gapped spark plugs |
| What can be done to verify if a turbine engine igniter is firing? | a consistent snapping sound on startup |
| What precautions need to be taken when removing an igniter plug from an engine? | low voltage lead should be disconnected to the exciter box and wait one minute before removing the igniter |
| What is the purpose of checking the "P" lead for a proper ground? | so the mags arent hot so no one could accidentally start it by moving the prop |
| What are the two types of spark plug fouling and what causes each? | carbon fouling- mixture too rich oil fouling- oil past the rings burning in the combustion chamber |
| What are the components in the primary electrical circuit of a magneto? | contact points, condenser, insulated coil |
| What is "E" gap? | the rotational position of a permanent magnet a few degrees past the neutral position of the breaker |
| How is the p-lead circuit related to the production of a spark in a magneto? | current is inducted in the p-lead circuit by a rotating magnet |
| What is the function of the capacitor in a magneto? | minimizes arcing at the breaker points |
| What is a compensated magneto cam, and on what kind of engine is one used? | a special cam used in magnetos mounted on high-performance radial engines |
| What is the significance of the numbers on the distributor of an aircraft magneto? | the sparking order of the magneto, not the firing order of the engine. |
| What happens in a magneto ignition system when the ignition switch is placed in the OFF position? | primary circuit is connected to ground. |
| What is the main advantage of a magneto ignition system over a battery ignition system for an aircraft reciprocating engine? | magneto has its own source of electrical energy, and it is not dependent upon the battery. |
| What is the reason for having a low-tension ignition system on some aircraft? | used on aircraft that fly at high altitudes where there is a problem with flash over |
| What is the basic difference between a low-tension magneto and a high-tension magneto? | low-tension: uses a coil to boost higher voltage high voltage: magneto is already high enough voltage |
| What is meant by an all weather spark plug? | 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 |
| What is the difference between a hot spark plug and a cold spark plug? | A hot spark plug has 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 checked when a magneto is internally timed? | consists of adjusting the breaker points so they will open at the instant the rotating magnet is in its E-gap position |
| What is the purpose of a vernier coupling used on some aircraft magneto drives? | allows the magneto-to-engine timing to be varied in increments of less than one degree. |
| What is the advantage of fine-wire spark plugs over massive electrode spark plugs? | have a firing end that is more open |
| 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. |
| What is the purpose of staggered timing between the two magnetos on an aircraft engine? | Engines in which the exhaust gas scavenging from the cylinders is uneven use staggered ignition timing. |
| In what position should the ignition switch be placed when using a timing light on the magnetos? | In the BOTH position. |
| 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, and if they are put in too tight, there is danger of cracking the insulation. |
| Why are pressurized magnetos used on most reciprocating-engine-powered aircraft that fly at high altitudes? | a better insulator than less dense air |
| What type of ignition system is used on most turbine engines? | High-intensity, intermittent-duty, capacitor discharge ignition systems. |
| What is the function of an impulse coupling? | holds the rotating magnet until the piston passes over top dead center |
| What kind of gauge should be used to measure the electrode gap in aircraft spark plugs? | round wire gauge. |
| How many igniters are used in 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 ignition system is a glow plug igniter used? | A low-voltage system. |
| How is the strength of the magnet in a magneto checked? | put on a test stand and rotated at a specified speed. |
| In what position is the magnet in a magneto when the greatest change in flux density in the coil core takes place? | a few degrees beyond its neutral position |
| In what position is the magnet in a magneto when the breaker points begin to open? | In its E-gap position |
| 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. |
| What turns on the autoignition system in a turbo-prop engine? | A torque pressure switch energizes the system when the engine stops producing torque. |
Created by:
possumslopper2000
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