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H. Spark Plugs
Each cylinder has two spark plugs. The left magneto connects to the top spark plugs on the left cylinders and it connects to the bottom spark plugs on the right cylinders.
The right magneto connects to the top spark plugs on the right cylinders and the bottom spark plugs on the left cylinders.
4. Operation
A. Ignition switch Set to OFF
) The ignition switch gives a ground to both magnetos.
) The magnetos cannot make high tension pulses of electricity.
) the spark plugs cannot make sparks.
) The engine cannot run.
B. Ignition Switch Set to R
Use this setting to test the right magneto: ) The ignition switch gives a ground to the left magneto. ) The right magneto is live. ) If the engine turns the right magneto will make high tension pulses and the spark plugs will make sparks. ) The engine can run.
C. Ignition Switch Set to L
Use this setting to test the left magneto: ) The ignition switch gives a ground to the right magneto. ) The left magneto is live. ) If the engine turns the left magneto will make high tension pulses and the spark plugs will make sparks. ) The engine can run.
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D. Ignition Switch Set to BOTH
This is the usual setting when the engine runs. ) Both magnetos are live. ) When the engine turns both magnetos make high tension pulses and the spark plugs make sparks. ) If the engine is running and power is supplied to the LASAR system, the LASAR system will operate in automatic mode (if installed).
E. Ignition Switch Set to START
Use this setting to start the engine.
(1) SlickSTART Magneto Booster System Installed
) Both magnetos are live.
) The ignition switch connects a 28 V positive supply from Main Bus 1 to the starter relay.
) The SlickSTART booster receives energy and supplies the retard breaker magneto with
energy for an additional ignition spark.
(2) LASAR System Installed
) Both magnetos are live.
) The ignition switch connects a 28 V positive supply from Main Bus 1 to the starter relay.
) If electrical power is supplied to the LASAR system, then it is set to automatic mode.
) When the engine turns less than 275 RPM the LASAR control unit sets the ignition timing to TDC. The control unit gives a higher energy spark at the spark plugs.
) When the engine turns between 275 RPM and 700 RPM the LASAR control unit sets the ignition timing according to the engine personality map. The control unit gives a higher energy spark at the spark plugs.
) When the engine turns more than 700 RPM the LASAR control unit sets the ignition timing according to the engine personality map. The higher spark energy at the spark plug is reduced to the normal level.
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Trouble Shooting
1. General
This Section gives you the trouble-shooting data for the ignition switch. Refer to the Lycoming Maintenance Manual and the equipment manufacturer's manuals for more data on trouble-shooting the engine ignition system. If you have the trouble detailed in the Trouble column read across to the Possible Cause column. Then do the repair given in the Repair column.
Trouble Possible Cause Repair
Engine does not start or Ignition switch/switch cable Disconnect the battery.
engine is not easy to start. defective. Disconnect the spark plugs. Disconnect the ignition switch cables from the LASAR control unit (if installed). Set the ignition switch to START. Do a test for an open circuit between the left switch-cable and ground. Do a test between the right switch-cable and ground. If you do not get an open circuit then repair the switch cable. Or replace the ignition switch.
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