Aircraft Technical Manual
Jabiru Aircraft
Pty Ltd
J120, J160, J170, J200/J400, J230/J430, J250/J450 Variants
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ISSUE
1
2
3
4
5
Dated: 29th October 2014
Issued By: AS
Page: 75 of 298
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Lightly paint both the thread of the fibreglass socket and the stainless steel bush with mixed
resin.
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Mix cotton fibre flock with the resin to a “gluey” consistency; this mix can be left slightly wet & thin
– this will aid penetration into the small voids in the threads.
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Screw the new bush into the wing. Use a spanner on the small bolt to drive the bush. Where an
eccentric type is being fitted ensure it is oriented correctly.
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Ensure that the bush is straight, positioned centrally on the fibreglass lug and not cross-threaded.
Leave to cure.
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Once the resin has completely set the small drive bolt can be removed from the bush. Inspect
the centre bore of the bush and if necessary, clean out any resin using a pick or an adjustable
ream.
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Test fit the new wing attachment bolt. Lightly hand polish bolt before fitting. If the fit is too tight
an adjustable ream may be used to carefully re-size the bore of the bush. The ream must be
adjusted to take a small cut to prevent from turning the bush. Minimum material must be
removed.
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Fit the wing & test the connection for free-play as detailed in Section 5.12. Ensure a new bolt is
used on the attachment which has been serviced.
CAUTION
Do Not apply any load to the bush until it has cured.
Do Not use rapid-set (i.e. 5-miniute) epoxy.
5.22.2 Attachment Point Service
– Movement Between Bush & Wing
If the stainless steel bush fitted to the wing has become loose in the fibreglass lug it may be
corrected as detailed below. This is the most common situation causing free-play in wing
installations.
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Remove the wing from the aircraft or mount it on stands as detailed above.
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If the bush is an eccentric type (where the hole for the bolt is not in the centre of the bush) make
a note of the orientation of the original part.
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Use a large soldering iron or similar to heat the bush to around 70°C. This softens the resin
bonding the bush in place and makes removal easier.
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Take a bolt at least 1 size smaller than the centre hole in the bush
– i.e. for a ¼” bush use a 3/16”
bolt. Fit the bolt to the bush and affix a washer & nut. Tighten so that the small bolt is clamping
the bush. This allows the technician to use the small bolt to screw the bush in and out of the
fibreglass lug.
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Remove the bush from the wing.
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Clean the thread cut into the wing lug fibreglass using a 5/8” UNC or 7/8 UNC tap as appropriate.
Take care to align the tap teeth with the old thread & ensure tap is not cross-threaded.
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Clean the bush: remove all old resin & paint using a wire wheel or similar. Then place the bush /
bolt assembly in an acetone bath to remove all oils. Blow dry using clean air before installation.
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Mix Jabiru Epoxy resin & hardener according to the manufacturer instructions.
-
Lightly paint both the thread of the fibreglass socket and the stainless steel bush with resin.
-
Mix cotton f
ibre flock with the resin to a “gluey” consistency; this mix can be left slightly wet & thin
– this will aid penetration into the small voids in the threads.
-
Screw the bush into the wing. Use a spanner on the small bolt to drive the bush. Where an
eccentric type is being fitted ensure it is oriented correctly.
-
Ensure that the bush is straight, positioned centrally on the fibreglass lug and not cross-threaded.
Leave to cure.
-
Once the resin has completely set the small drive bolt can be removed from the bush. Inspect
the centre bore of the bush and if necessary, clean out any resin using a pick or an adjustable
ream.
-
Test fit the new wing attachment bolt. Lightly hand polish bolt before fitting.
-
Fit the wing & test the connection for free-play as detailed in Section 5.12. Ensure a new bolt is
used on the attachment which has been serviced.
CAUTION
