The Light Weight Engine Houtekietstraat 11
B-8540 Deerlijk, Belgium
EFFECTIVITY page 26
ALL 19-3-2019
Some sensors or systems are redundant, for example the ignition, the crankshaft sensors, etc.
Other systems are optionally available in redundancy, fuel pump, battery, generator or additional
injectors. Redundant systems serve to increase the reliability of the motor and not to allow flying
if one system fails. In no case it is allowed to take-off if one system failed on ground before take-
off (for example one ignition circuit). Redundant systems allow continuing the flight until an
airfield may be reached, a safe landing is secured and the failure may be fixed.
• Unusual noises
If any unusual noises occur, maybe combined with a high volume, than it is possibly that the
exhaust system or the intake air system which is damaged. A defective exhaust system could
mean that the exhaust gases are not totally transported outside the cowling and may even
penetrate into the cabin. Or some hot gazes may heat other parts and create further damages.
This means high danger for the pilot or the aircraft and a landing of the next airfield is to be
initiated immediately. Once landed the problem may be found and fixed.
Unusual noise coming from the intake system points to problems coming from a defective or
loose air filter system. This means danger for the motor, respectively the possibility of intake of
additional air or worse, the suction of foreign particles into the engines combustion chamber,
which may damage the engine seriously. This means to initiate the immediate landing on the
next airfield as soon as possible and to fix the problem.
• Heavy vibrations
Since the LF39 has an injection system carburator icing cannot occur and not be the reason for
heavy vibrations. This means that in case heavy vibrations occurs, they must come from other
sources, like the propeller, loss of counterweights on the propeller, loose bolt holding the
propeller, loose spinner, etc.
Heavy vibrations can also be a sign of beginning engine failure or indicate the loss of one
cylinder, for example due to an injection failure or a damaged ignition.
In any case set a power setting with lowest vibration, but which still allows a safe flight and land
on the next airfield.
ECU ERROR MESSAGES
Possible error messages coming from internal diagnosis of the ECU:
Two leds are incorporated on the ECU housing, no LED lit = ALL OK !
All error diagnostic is logged. (See E.C.U. D-Motor Installation and troubleshooting manual)
Indicated errors from the diagnose means that or the sensor is damaged, or that the parameter is
outside the expected range. For example, if the temperature is too high.
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