The Light Weight Engine Houtekietstraat 11
B-8540 Deerlijk, Belgium
EFFECTIVITY page 27
ALL 19-3-2019
The error number 8 may be shown also directly after the start of a cold engine. In this case the
required temperature of the probe to make a precise measurement is yet not reached. After
warming up the error message should disappear.
Safety / Avoiding failures
Some failures are announced or get worse over the time. The recognition on time and the analysis of
the causes may help to avoid failures of the motor or dangerous situations.
Loss of Cooling liquid
Loss of cooling liquid leads to an insufficient cooling of the engine, respectively too high
temperatures and in most cases also to damages or operation malfunctions. For that reason the leak-
tightness of the cooling system should be verified regularly. The normal through the maintenance
trap is not sufficient for a complete check of the cooling system.
NOTE
A damaged sealing surface of the filling cap or a damaged head seal for example, cannot be
recognized by controlling the level of the cooling liquid in the overflow reservoir. It is possible that
when the motor gets warm, the cooling liquid is pressed into the reservoir, but during the engine get
colder the liquid is not sucked back in the cooling system of the engine anymore. An indication to that
is, for example, if the temperature of the motor is normal during the flight, but during or after the
landing the temperature of the engine does not get down, or even gets higher.
For a full check of the cooling system the upper part of the cowling has to be dismounted. All parts
and pipes of the cooling system should then be controlled visually for leakages, damages or signs of
abrasion. Verify the hose clips of the pipes for tightness, open the cap of the ventilation tank (only if
engine is cold) and verify if the ventilation tank is full of cooling liquid (level should be just below the
sealing surface). Check if the sealing surfaces of the ventilation tank and of the cap are clean and
without visible damages. If not please change the damaged parts and refill the cooling liquid if
required.
Most ULTRA Light aircrafts are equipped with a heat exchanger. In the heat exchanger the oil
interact, respectively exchange its heat with the cooling liquid. This means that the cold oil is heated
and the hot oil cooled down by the cooling liquid. Once the engine is heated up to normal range and
while it is operated normally (horizontal flight) the temperature of the oil and of the cooling liquid
are tightly related to each other, whereat the temperature of the oil should be 10°C to 15°C higher
than the cooling liquid.
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