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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: 120 of 233
9.4
AILERONS
9.4.1 DESCRIPTION
Ailerons comprise a moulded and bonded monocoque structure embodying a composite drive arm.
While most models employ a conventional aileron some J170 variants employ a Friese aileron as
shown in Figure 43.
Details of typical aileron installations are shown as Figures in Section 7.
9.4.2 AILERON REMOVAL
1.
Unbolt cable from aileron control arm.
2.
Loosen screws in hinge pin retainers and lift hinge pin retainer away from the hinge pin. It is not
necessary to completely remove these parts.
3.
Remove hinge pins.
4.
Remove aileron.
WARNING
All spherical bearings must be fitted with a large washer on the outside of the through-bolt to
prevent the bearing case and cable releasing in the event of a bearing failure.
9.4.3 AILERON INSPECTION & REPAIR
Inspect ailerons for any signs of delamination or cracking. Pay particular attention to the Drive Arm
and hinges and their surrounding areas.
Inspect the top front of each aileron for any signs of rubbing against the wing at full up deflection:
when the aileron hinge is pressed up using thumb pressure there should still be clearance between
the aileron and the wing. Section 4.17 refers.
Repairs must be referred to Jabiru Aircraft Pty Ltd or our approved local agent.
9.4.4 AILERON BALANCING
The aileron does not have balancing weights fitted. The Aileron used for the J160-C does however
have limits for weight and hinge moment which are applicable to all models using the same aileron
(1215mm nominal length, non-Friese type):
-
Weight
1150g
+/- 100g
-
Hinge Moment
94000g.mm
+/- 4000g.mm
The aileron balance is checked at the factory during assembly and unless they are repaired or
refinished the balance should not change.
To balance the ailerons they must be removed from the aircraft. Balancing is done around the
hinges with the hinge pin line horizontal and on the high side of the ailerons. The hinge moments
can be measured by measuring the upwards force needed to maintain the flat side of the aileron
horizontal. Note that as this load is small, a finely graduated spring balance or similar measuring
instrument will be required.
9.4.5 AILERON INSTALLATION
For aileron installation, reverse the procedure detailed for removal above.
9.5
AILERON RIGGING
With the control stick in the neutral position, use a straight-edge not less than 1 metre long. Hold the
straight-edge flush on the underside of the wing aerofoil and adjust aileron to sit on the straight-edge.
Make this adjustment with the cable rod-ends, ensuring that on completion the locknut is tight on the
rod-ends and that cable is visible through the inspection hole in the rod-end.