DG Flugzeugbau DG-800A, Руководство по обслуживанию, Страница: 94 / 163

Maintenance Manual DG-808C
Issued: July 2017 TN800/45 4.33
4.20 Checking the Ignition unit
1) Ducati-magneto generator Type P12W150 part no. 43171402
12V/150W with electronic boxes Ducati part no. 432372500
The engine has 2 independent ignition circuits. It is equipped with a
DUCATI electronic C.D. ignition unit with magneto generator for
supplying the electrical system of the aircraft. The ignition unit is adjusted
by the engine manufacturer and requires no servicing. In case of trouble
execute the following procedures:
2) The engine does not start or suddenly stops without running out of fuel.
This means, that both ignition circuits are defective.
a)
if the starter turns at less than 500 rpm, there are no sparks at the spark
plugs. Therefore the battery must be charged enough to reach this rpm
(normal starting rpm with well charged battery is approx. 600 rpm).
b) Shorting cables must not be in contact with ground or with each other
when the ignition switch is in on position. For checking gain access to
the connector plugs at the ignition electronic boxes by removing Ty-
raps and heatshrink tubing. Check the resistances between wire 301
(right) and ground (engine block) and wire 302 (left) and ground (plugs
disconnected):
The resistance must be infinite (ignition on) and zero (ignition off).
c) Checking the generator coil: Disconnect the engine main plug and
measure the resistance between wires 491 and 501. It should be appr.
0.5 Ohm.
3) During ignition circuit check before take off the rpm goes down
significantly or the engine stops. For checking gain access to the connector
plugs at the ignition electronic boxes by removing Ty-raps and heatshrink
tubing.
a) Swap the connector plugs at the ignition boxes from one box to the
other. Therefore you need extension wires see drawing 8E210
(enclosed to this manual). If the malfunction now changes to the other
circuit, one of the boxes is defective. Detect the faulty one by mutual
disconnection of the plugs.
Stop the engine before disconnecting a plug from a box.
Caution: Don’t mix up the wires!