Aircraft Technical Manual
Jabiru Aircraft
Pty Ltd
J120, J160, J170, J200/J400, J230/J430, J250/J450 Variants
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ISSUE
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2
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Dated: 29th October 2014
Issued By: AS
Page: 73 of 298
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Align the bolt holes of the two strut lugs. This can be visually by fitting a long bolt to both the new
and the old lugs and sighting along the strut to ensure they are parallel. Again, small errors here
will cause difficulty re-assembling the aircraft so care must be taken.
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Match drill the new lug to the strut.
CAUTION
Ensure holes in strut are not elongated, oversized or otherwise damaged during drilling.
De-burr before final assembly.
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Fit bolts and assemble lug to the strut. Apply corrosion inhibitor to the bolts & nuts.
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Re-paint the new lug to match the aircraft colour.
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Re-assemble the aircraft and re-test as detailed in Section 5.12. Ensure a new bolt is used on the
attachment which has been serviced.
If the holes in the wing attachment lugs of the fuselage have worn so that standard or close tolerance
bolts have excess movement then the Aluminium fuselage lugs must be replaced. Note that this
type of wear is unusual. Checking the more common wear modes detailed below is recommended
before replacing fuselage lugs.
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Either remove the wing from the aircraft completely or place on stands as detailed above.
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Remove any upholstery covering the plates inside the cabin.
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Remove the bolts holding the lugs to the fuselage.
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Remove the lugs from the fuselage. These parts are bonded to the airframe with a bed
of “Flock”
– cotton fibre flock mixed with Epoxy resin – as well as bolts. Once the bolts have been
removed, use a soft hammer or similar to break the lugs from their flock bed.
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Use a die-grinder remove some of the old flock bed. Do not remove that portion of the bed where
the bolts pass through: this will be used to locate the replacement lugs (See a cross-section of
the lug assembly shown in Figure 35). Leave a portion of the bed approximately 12mm in
diameter around each bolt hole to support the new lugs.
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Dry fit the replacement lugs to check for correct fit. When ordering replacement parts note Figure
34: 2 different model lugs have been used on Jabiru Aircraft; the correct length must be fitted or
dihedral angle errors will occur.
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For J250 & J450 models the hole in the tip of the lug must be reamed to suit an AN5 or AN175
bolt before installation.
CAUTION
Reaming is necessary to achieve proper tolerances. Do not drill.
Figure 34
– Wing Lug Versions (all J-Series)
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Prepare the Aluminium lugs for bonding: Lightly sand bonding faces using 400-grit sandpaper to
remove dirt etc from the surface. After sanding, wipe bonding faces with a rag moistened with