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: 93 of 233
8.6.3 MAIN WHEEL STUB AXLE INSTALLATION
1.
Secure axle and inboard brake plate to composite leg, making sure that any wheel alignment
shims are installed in their original position.
2.
Install wheel assembly on axle in accordance with Section 8.5.
8.7
WHEEL BALANCING
Since uneven tyre wear is usually the cause of tyre imbalance, replacing the tyre will probably correct
this condition. If a wheel shows evidence of imbalance during service, it may be statically balanced.
8.8
MAIN GEAR LEG
8.8.1 DESCRIPTION
For all models discussed in this manual the main undercarriage has the same general arrangement:
a laminated composite spring forms the leg which is bolted to the fuselage at one end and the main
wheels at the other.
8.8.2 REMOVAL
1.
Remove fairings to access inner and outer undercarriage leg bolts as detailed in Section 8.3.
2.
Jack the aircraft in accordance with the details given in Section 8.2.
3.
Un-bolt the axle extension and the brake calliper(s) to allow the removal of the wheel, tyre and
brake disc assembly. Allow the brake calliper(s) to hang on the brake line, ensuring that the line
is not being kinked, distorted or otherwise damaged. If the leg must be removed for an extended
period it is recommended to use zip-ties or similar to support the brake calliper assembly to take
the load off the brake line.
4.
Cut the zip-ties holding the brake line to the undercarriage leg.
5.
Un-bolt the stub axle from the composite leg and remove.
6.
Remove bolt/nut from top inboard end of undercarriage beam. Remove rubber bushes (2).
7.
Remove bolts/nuts (2) from the clamp at bend in undercarriage beam.
8.
Remove clamp.
9.
Where equipped, note the orientation and remove the undercarriage leg wedge.
10.
Remove Undercarriage Leg Assembly.
8.8.3 INSTALLATION
The following procedural steps describe how to install the leg. Refer to applicable paragraphs for
installation of the individual components.
1.
Offer the beam to the fuselage and install clamp and bolts/nuts (2 OFF)
– Do not tighten at this
stage.
2.
Locate top end bolt, install and tighten nut. Use the torque value given in Table 1 as guidance,
however do not crush the rubber bush completely. Aim to compress the visible edge of the
rubber to about half its unloaded thickness.
3.
For the curved undercarriage leg show in Figure 62, tighten outboard clamp bolts/nuts (2 OFF).
Torque to “solid laminate” value give in Table 1.
4.
For the
“straight” undercarriage leg shown in Figure 61 follow the additional steps below:
-
Check that the flock clamp bed applied to the leg is in place and fits the outboard leg clamp
closely. If the flock has degraded, clean off any loose pieces.
-
Flock the clamp to the leg (Flock made by mixing Jabiru Epoxy resin and cotton fibre flock to
a gluey consistency). Do not tighten bolts while the resin is wet.
-
After the resin has cured (around 24 hours, possibly more in cold climates) fully tighten the
outboard clamp bolts.
Torque to “solid laminate” value give in Table 1.
