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cylinder give ignition. The engine ignition firing order is 1-3-2-4.
A. SlickSTART Booster System
The SlickSTART booster receives power only when the starter is engaged. Therefore this system
only affects the engine start-up process.
B. LASAR System
During engine start-up, the LASAR system sets the ignition timing to 0° before top-dead-center
(BTDC) and boosts the power of the electrical impulse to the spark-plugs. As the engine RPM
increases to 275 RPM the LASAR system advances the engine ignition timing according to the
engine personality map (EPM). When the engine RPM increases to 700 RPM the LASAR system
reduces the power of the electrical impulses to their usual value.
AIRCRAFT
Ignition DA 40 Series
AMM
Page 2
20 Sep 2007 74-00-00 Doc # 6.02.01
Rev. 5
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Figure 1: Engine Ignition Schematic Diagram
AIRCRAFT
DA 40 Series
AMM
Ignition
Doc # 6.02.01
Rev. 5 74-00-00 Page 3
20 Sep 2007
The LASAR system is an automatic system. If the ignition switch is set to the BOTH position or the
START position, then the LASAR system is switched on. If the LASAR system fails or the ignition
switch is set to any position other than BOTH or START, then the magnetos will operate in back-up
mode. In back-up mode the timing of the magnetos is fixed at 25° BTDC. A white ignition status
light (IGN or IGNITION) on the annunciator panel tells the pilot when the LASAR system is in backup
mode.
3. Ignition System Components
Figures 1 shows the schematic diagram of the ignition system. The ignition system has these
components:
A. Ignition Switch
The ignition switch is at the lower face of the instrument panel, on the left half. You operate the
ignition switch with a key. The ignition switch has these positions:
) OFF Both magnetos grounded, LASAR system (if installed) in back-up mode.
) R Right magneto live, left magneto grounded, LASAR system (if installed) in back-up
mode.
) L Left magneto live, right magneto grounded, LASAR system (if installed) in back-up
mode.
) BOTH Both magnetos live, LASAR system (if installed) in automatic mode if the engine is
running. LASAR system in back-up mode if the engine is not running.
) START Both magnetos live, LASAR system (if installed) in automatic mode and starter relay
ON.
You cannot repair the ignition switch.
B. Ignition Switch Cables
Cables connect the ignition switch to the SlickSTART booster control unit or LASAR control unit.
The control unit has special electrical cables which connect to the left magneto and connect to the
right magneto.
AIRCRAFT
Ignition DA 40 Series
AMM
Page 4
20 Sep 2007 74-00-00 Doc # 6.02.01
Rev. 5
C. SlickSTART Booster System
The SlickSTART booster system is the standard system in the DA 40. It is active only during the
engine start-up process.
The ignition-switch-cables connect to the SlickSTART booster. Nuts and bolts attach the booster
to a bracket on the left side of the engine mount. Electrical cables from the booster connect to the
left magneto and connect to the right magneto. The starter supplies electrical power to the booster.
A 5 amp in-line fuse protects the booster.
D. Limited Authority Spark Advance Regulator (LASAR)
The LASAR system is optional equipment.
The ignition-switch-cables connect to the LASAR control unit. Nuts and bolts attach the control unit
to a bracket on the left side of the engine mount. Electrical cables from the control unit connect to
the left magneto and connect to the right magneto. The Main Bus 1 supplies electrical power to the
control unit. A 10 amp circuit-breaker protects the circuit.
The LASAR system has these modes of operation:
) Automatic Mode. The automatic mode is the usual operating mode when the system is
operating correctly and the engine is running. The control unit energizes relays in the left
magneto and in the right magneto. The relays operate switches in each magneto which
electrically isolate the contact-breaker points from the low tension coils of the magneto. The
LASAR control unit controls the ignition timing and the high-tension voltage to the spark-plugs.
) Back-Up Mode. In back-up mode the electrical power to operate the relays in the magnetos is
removed. The switches close and the contact-breakers are re-connected in circuit with the
magneto low-tension coils. The magnetos now operate in the same way as standard magnetos.
The LASAR system goes into back-up mode when:
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钻石40系列AMM 3(62)
