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Aircraft Service Manual
Jabiru Aircraft
Pty Ltd
JTM001-1
J120, J160, J170, J200/J400, J230/J430, J250/J450 Variants
REVISION
1
Dated: Nov 2011
Issued By: SW
Page: 52 of 233
4.19 SPECIAL INSPECTIONS
– FUEL GAUGE DECAL SETUP
This procedure is applicable for Jabiru Aircraft equipped with wing tanks and electronic fuel gauge
senders.
This procedure must be carried out during initial assembly of a new aircraft or when a new gauge
sender is fitted.
The accuracy of the fuel indication system of the aircraft depends on careful and accurate completion
of this process.
The following special tools are required for this procedure:
-
Clamp suitable for crimping off fuel lines without damage (Figure 24).
-
Fuel container to drain fuel from wings.
-
Accurate fuel pump or measure. (i.e. Avgas bowser).
For this procedure the fuel tanks need to be filled from empty. Therefore, they must be emptied now.
Apply fuel line clamps to close the fuel lines between the wing tanks and the header tank.
Before starting the fuel gauge calibration the aircraft needs to be laterally (left/right) level. See the
aircraft flight manual for the levelling datum details.
Add 1.5L of fuel to each tank, this is the unusable fuel. Check the indication of the fuel gauge. The
fuel gauge needle must be pointing at the E or below. If it is not then the gauge unit will need to be
removed and adjusted. See Figure 20
– with the tank containing the unusable fuel amount the
needle must indicate a position between the two extremes shown.
Accurately add 20L into the tank (in addition to unusable fuel). Then take the fuel gauge calibration
decal (see Figure 21) and align inner fuel gauge dial representation with the 20L mark in the location
indicated by the pointer in the fuel gauge. Repeat for the second tank. Make sure the decals are
marked to indicate which tank they are matched with. In Figure 22 (left) a typical sender indication
with 20L added is shown. Note how the needle is just slightly above 1/4. In Figure 22 (right) a decal
assembly to match this indication is shown. The 20L arrow, on the outer, indicates just above the ¼
mark on the inner.
CAUTION
There is often a degree of friction within the gauge sender. Tap gently with a finger after adding
fuel to maximise accuracy of reading.
WARNING
Before removing clamps on the fuel line make sure all fuel lines are connected.
On removal of clamps check that the fuel lines are not damaged and return to their original shape
Figure 20 Max Empty (Left) and Acceptable Empty (Right) Indications