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4. Remove/Install the Starter Relay . . . . . . . . . . . . . . . . . . . . . . . . . 205
5. Remove/Install the Glow Relay . . . . . . . . . . . . . . . . . . . . . . . . . . . 207
AIRCRAFT
DA 40 Series
AMM
Starting
Doc # 6.02.01
Rev. 5 80-00-00 Page 1
20 Sep 2007
CHAPTER 80
STARTING
Section 80-00
Starting - Lycoming Engine
1. General
This Section tells you about the system that cranks the Lycoming engine for starting.
Note: Equipment which is certified for installation in the DA 40 is listed in Section 6.5 of
the Airplane Flight Manual. Such equipment may be installed in accordance with
the Airplane Maintenance Manual.
Any equipment which is not listed in Section 6.5 of the Airplane Flight Manual is
called "Additional Equipment". The installation of Additional Equipment is a
modification which must be handled in accordance with national regulations or a
Service Bulletin.
2. Description
Figure 1 shows a schematic diagram for the engine starter system. The system has these
components:
A. Ignition Switch
The DA 40 has the usual ignition switch. The ignition switch is in the lower instrument panel, on the
left. You operate the ignition switch with a key. You can set the ignition switch to any one of five
positions. To set the START position you must hold the ignition key against a spring. If you release
the key in the START position, the spring will turn the key counter-clockwise to the BOTH position.
The switch has these positions:
) OFF: Both the magnetos are grounded. The starter is off.
) R: The right magneto is live, the left magneto is grounded. The starter is off.
) L: The left magneto is live, the right magneto is grounded. The starter is off.
) BOTH: Both the magnetos are live. The starter is off.
) START: Both magnetos are live. The starter is on.
You cannot repair the ignition switch. Refer to Section 74-00 for the procedure to replace the
ignition switch.
AIRCRAFT
Starting DA 40 Series
AMM
Page 2
20 Sep 2007 80-00-00 Doc # 6.02.01
Rev. 5
5
MAIN
BUS
1
Fail Indication
Left Magneto
Right Magneto
Power
Ground
10
5
ESS
BUS
Left
Magneto
Right
Magneto
3
INSTRUMENT PANEL FIREWALL ENGINE COMPARTMENT
Starter Relay
Starter Motor
Lasar
Starter Switch
S R L
Ignition Warning Lamp
Starter Warning Lamp
Annunciator Panel Test Switch
Battery
Figure 1: Starter System Schematic Diagram
AIRCRAFT
DA 40 Series
AMM
Starting
Doc # 6.02.01
Rev. 5 80-00-00 Page 3
20 Sep 2007
B. Starter Relay
The DA 40 has a heavy-duty starter relay. The starter relay attaches to a mounting on the engine
firewall in the relay mounting box. The relay has two small connectors for the control cables and
two large connectors for the power cables. A cable for the starter-power-on-light also attaches to
the starter relay. It connects to the same terminal as the power lead to the starter.
C. Starter Motor
The DA 40 has a lightweight starter motor. The motor attaches to the bottom of the engine
crankcase at the front.
The starter has a pre-engage solenoid. The pre-engage solenoid moves the starter-pinion to
engage with the engine-starter-gear. It also makes the electrical contacts for the starter motor.
When the starter pinion is fully engaged with the engine-starter-gear, the electrical circuit for the
starter motor is made and the starter turns.
The starter has a reduction gear. The reduction gear gives better performance from a smaller
electric motor. Refer to the Lycoming Operators Manual/Sky-Tec Manual for more data about the
starter motor.
D. Starter Power-On Light
The start system has an warning light. The light is located on the annunciator panel located on the
instrument panel, at the top left. The light comes on when the starter relay is made and electrical
power is going to the starter motor. A fuse protects the warning light system.
E. Cables
Heavy duty cables supply electrical power from the battery to the starter relay and from the starter
relay to the starter solenoid.
AIRCRAFT
Starting DA 40 Series
AMM
Page 4
20 Sep 2007 80-00-00 Doc # 6.02.01
Rev. 5
3. Operation
The starter will not operate with the ignition switch in any of the first four positions. If you turn the
ignition switch to the START position with the ALT/BAT Switch set to ON, then these things occur:
) The current from the ignition switch energizes the starter relay.
) The starter relay connects the battery to the solenoid on the starter.
　
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