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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: 46 of 233
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Note the result of Inspection A and carry on to Inspection B in all cases.
4.17.2 INSPECTION B:
This inspection has two purposes: to check to see if jamming is likely due to insufficient clearance at
the control’s point of overlap and to check if the control hinges are sufficiently stiff. All controls must
be inspected in this way regardless of the results of Inspection A.
Check the clearance between the control surface and the aircraft at the point of overlap as detailed
below:
-
Set the controls so that the control being tested is at the point of overlap
– as shown in the right
picture in Figure 12. If the control being tested does not deflect to a point of overlap then place it
as close as possible to the overlap point.
-
Press against the control using a thumb
– pushing the control in the direction that would close the
control clearance. Measure the control clearance while this load is applied.
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Remove the load from the control and re-measure the control clearance.
-
Controls are to be tested this way at every hinge. The force to be applied in each direction is
approximately 5-7kg (11
– 15lb). Inspectors can “calibrate” their thumbs by pushing onto a set of
scales to indicate how hard they need to push. See Figure 13 for details of where to push on the
controls.
Rectification work is necessary whenever any of the following criteria are met:
-
The control clearance is less than 3mm at the control’s point of overlap when tested as detailed
in Inspection B. Note that this clearance limit only applies to controls which are configured such
that they actually have a point of overlap.
-
The control clearance changes by 5mm or more when the test load of Inspection B is applied.
This is irrespective of if the control has a point of overlap or not.
Carry on to Inspection C in all cases.
Figure 11
– Rudder Gap Cross Section
Control at the point of overlap. Measure
the control clearance in this position
while pressing on the control in the
middle of the hinge. Repeat the
measurement when unloaded.