Jabiru Aircraft
Pilot Operating Handbook
Model J230-D
Revision:
6
28/2/2020
Page 86
8.4.2
Fuelling
– Alcohol Content Test
As the use of Ethanol in MOGAS becomes more widespread it has become difficult to be sure of
a fuel’s Ethanol content. Jabiru Aircraft recommend the following test be carried out before a new
batch of MOGAS is used.
The test uses the principle of phase separation of a water/fuel sample and agitating the sample to
induce phase separation. If alcohol is present, the alcohol combines with the water and separates
out of the gasoline.
a.
Using a clear jar of about 100-200 ml capacity (ideally a long and narrow jar) add about
10% by volume of water and mark the level of the water on the jar;
b.
Add a sample of the fuel to be tested to the jar so that the relative volumes are about
10% water, 90% fuel;
c.
Shake the sample vigorously and then allow the sample to settle;
d.
Check the level of the “water”;
e.
If the level is the same as previously marked on the jar, no alcohol is present in the fuel
and the fuel is acceptable for use;
f.
If the level of “water” increases, alcohol is present in the fuel.
At the time of writing Jabiru Aircraft are delivered with an OEM fuel tester marked with graduations
for use in assessing alcohol content.
8.4.3
Engine Oil
a.
Ensure the aircraft is parked on level ground.
b.
Where possible, shut down and allow the engine to sit for at least 5 minutes before
measuring oil level.
c.
Open the oil door on the upper cowl. Remove the dipstick from the engine and wipe
clean with a clean rag.
d.
Re-fit the dip-stick to the engine. It must be screwed in fully.
e.
Remove dip-stick & check the level indicated. Ensure the oil level is between the marks.
f.
If required, top up the sump with fresh oil of the same brand and grade. Note that
approximately 300ml are required to raise the level from the bottom mark to the top. A
small funnel must be used to avoid spilling oil. Alternatively, partially insert the dipstick
so that the lower end is in the engine filler tube and the upper end standing proud of the
cowl. Place the neck of the oil bottle against the stick and pour carefully: the oil will cling
to the dipstick and be guided into the engine. If required, use a rag or similar as a wind
shield to prevent oil being blown away from the stick.
NOTE
For short flights (up to 1.5 hours) it is recommended to maintain the oil level at the lower
dipstick mark as this reduces oil temperatures and the rate of oil use. Oil use varies
between aircraft however: ensure that oil is sufficient for the intended flight.
WARNING
Note: Do not use any type of automotive oil. Aviation oils have been blended specifically
for the operating conditions found in an air cooled aero engine operations. Using
automotive oils has been found to be detrimental to the operation of the Jabiru Engine.
Jabiru has not verified the attributes claimed by oil additive manufacturers and warn
against using them as they may have detrimental effects.
