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connect the magnetos to the spark plugs. Two spark plugs in each cylinder give ignition to the
engine.
Ignition
DA20-C1 AMM
Page 2
29 Apr 2004 74-00-00 Doc # DA 201-C1
Rev. 9
BOTTOM SPARK PLUGS
TOP SPARK PLUGS
1 2 3
1 2 3 4
4
4 3 2 1
Figure 1: Ignition System Schematic Diagram
DA20-C1 AMM
Ignition
Doc # DA 201-C1
Rev. 9 74-00-00 Page 3
29 Apr 2004
A. Ignition Switch
The ignition switch is in the lower center of the instrument panel. You operate the ignition switch
with a key. The ignition switch has these five positions:
− OFF - Both magnetos grounded.
− R - Right magneto live, left grounded.
− L - Left magneto live, right grounded.
− BOTH - Both magnetos live.
− START – Retarded points of left magneto live, Right magneto grounded, starting
vibrator energized and starter relay energized.
For data on repairs to the ignition switch refer to the Teledyne Industries Support Manual.
B. Ignition Switch Cables
Shielded cables connect the ignition switch to the left magneto and to the right magneto.
C. Magnetos
The DA20-C1 has two Slick magnetos. The Slick magnetos supply the electrical pulses to the
spark plugs. The left magneto has an additional set of contact points. These points are active
only when the engine is being started.
D. High Tension Cables (Ignition Harness)
Each magneto supplies high tension pulses to one spark plug in each cylinder. High tension
leads (spark-plug leads) connect the magnetos to the spark plugs. Each lead has a center core
which transmits the high tension electricity. It also has a layer of insulation. The outside of each
lead has a braided metal screen. The braided metal screen prevents radio interference. P-clips
and Ty-wraps hold the leads in position.
Each spark plug lead has special end fittings. The end fittings stop water going into the
connection. The end fittings also connect the braided metal screen to prevent radio interference
You can test the spark-plug leads with a high tension tester.
Ignition
DA20-C1 AMM
Page 4
29 Apr 2004 74-00-00 Doc # DA 201-C1
Rev. 9
E. Spark plugs
Each cylinder has two spark plugs. The left magneto connects to the top 1-3 spark plugs and
the top 2-4 spark plugs. The right magneto connects to the bottom 1-3 spark plugs and the
bottom 2-4 spark plugs.
DA20-C1 AMM
Ignition
Doc # DA 201-C1
Rev. 9 74-00-00 Page 101
29 Apr 2004
TROUBLE-SHOOTING
3. General
The table below lists the defects you could have with the ignition switch and the ignition harness. It
does not give trouble shooting data for the TCM ignition components. Refer to the Teledyne
Continental Maintenance Manual for trouble-shooting the TCM ignition components.
If you have the trouble detailed in the Trouble column read across to the Possible Cause column.
Then do the repair in the Repair column.
Trouble Possible Cause Repair
Engine does not start/not easy
to start.
Ignition switch/switch cable
defective.
Do the ignition switch test:
If necessary replace the
ignition switch:
− Refer to the ignition switch
remove/install procedure.
Replace the ignition switch
cables:
− Refer to the ignition switch
cables remove/install
procedure.
Defective ignition spark-plug
leads.
Replace the spark-plug leads:
− Refer to the spark-plug
leads remove/install
procedure.
Starting Vibrator Do starting vibrator test
Ref. Teledyne Continental
Motors document X43003-1
Replace starting vibrator if
necessary
Check vibrator battery voltage If voltage is below 12 volts,
replace battery
Ignition
DA20-C1 AMM
Page 102
29 Apr 2004 74-00-00 Doc # DA 201-C1
Rev. 9
Figure 2 Ignition Switch Installation
DA20-C1 AMM
Ignition
Doc # DA 201-C1
Rev. 9 74-00-00 Page 201
29 Apr 2004
MAINTENANCE PRACTICES
1. General
These maintenance practices tell you how to test the ignition switch. They also tell you how to
remove and install the ignition switch and the ignition switch cables. And they tell you how to
remove and install the spark-plug leads.
Refer to the DA20-C1 Flight Manual for engine run instructions/data.
2. Ignition Switch Test
Detail Steps/Work Items Key Items
WARNING: DISCONNECT THE BATTERY BEFORE YOU WORK ON THE
IGNITION SWITCH.
WARNING: YOU MUST MAKE SURE THAT THE ENGINE IS SAFE BEFORE
YOU DO WORK ON THE IGNITION SYSTEM. DISCONNECT THE
SPARK PLUG LEADS. MAKE SURE THAT:
- THE IGNITION SWITCH IS IN THE “OFF” POSITION.
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