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(1) Power is supplied to the control unit and the engine is not running.
(2) The engine is running and there is no power to the control unit.
(3) The engine is running and the ignition switch is not set to BOTH.
(4) The system malfunctions.
AIRCRAFT
DA 40 Series
AMM
Ignition
Doc # 6.02.01
Rev. 5 74-00-00 Page 5
20 Sep 2007
E. Ignition Status Light (IGN or IGNITION)
The white ignition status light (IGN or IGNITION) is located on the annunciator panel which is
located on the instrument panel, at the top. It is only used when the LASAR ignition system is
installed. The ignition status light comes on when the LASAR system is in the back-up mode (failure
mode).
F. Magnetos
(1) SlickSTART Magneto Booster System Installed
The 2 Slick magnetos attach to the rear accessory housing and are driven directly by the
engine. The contact breakers control the ignition timing. The ignition timing is fixed to 25° BTDC.
During the engine start-up process, the SlickSTART booster delivers energy to the retard
breaker magneto.
(2) LASAR System Installed
The 2 Slick magnetos attach to the rear accessory housing and are driven directly by the
engine. The left magneto has a position/speed sensor which gives a reference signal to the
LASAR control unit. The right magneto does not have a sensor.
Each magneto has an electrical relay which is controlled by the LASAR control unit. In the
automatic mode of operation the control unit sets the relay to electrically isolate the low tension
circuit of the magneto. The engine ignition timing is then controlled by the LASAR control unit.
If the LASAR system is in back-up mode, the electrical relays reconnect the contact-breakers
into the low-tension circuit of the magneto. The contact breakers control the ignition timing. In
back-up mode of operation the ignition timing is fixed to 25° BTDC. An electrical cable connects
each magneto to the LASAR control unit.
G. High-Tension Cables (Ignition Harness)
Each magneto supplies high-tension pulses to one spark-plug in each cylinder. High tension cables
connect the magneto to the spark-plugs. Each cable has a core which transmits the high tension
electricity. The core has thick layer of insulation and the insulation is covered with a braided metal
screen. The braided metal screen connects to the cable end-fittings and prevents radio
interference.
Each high tension cable has special end-fittings. The end-fittings stop water going into the cable
connections and electrically bonds the braided-screen.
You can test the high tension ignition cables with a high tension tester.
AIRCRAFT
Ignition DA 40 Series
AMM
Page 6
20 Sep 2007 74-00-00 Doc # 6.02.01
Rev. 5
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.
AIRCRAFT
DA 40 Series
AMM
Ignition
Doc # 6.02.01
Rev. 5 74-00-00 Page 7
20 Sep 2007
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
　
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