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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: 48 of 233
4.17.3 INSPECTION C:
This inspection is to see if there is any travel restriction of a control at deflections other than at the
control’s point of overlap.
For the purposes of this inspection a travel restriction is defined as a one-way jam
– i.e. the control
cannot reach full deflection but is able to move freely in the other direction.
While a control is very unlikely to completely jam due to a travel restriction the fact that the control it
not achieving its full travel must be addressed.
Travel restriction normally presents at
the opposite control travel extreme to the control’s point of
overlap
– i.e. for the elevator shown above (Figure 14) full stick-forward deflection is the point most
likely to exhibit a travel restriction as the lower surface of the elevator hits the aircraft.
Inspect each control as detailed below:
-
Inspect the control for scratches and marks (as shown in Figure 15) in the overlap area where the
control runs inside the aircraft. If no marks are found further inspection and/or rectification is
unnecessary. However, if such marks are found compete the following steps:
-
Mark the extents of the control surface travel when driven by the controls.
-
Disconnect the control from the control cable, allowing it to swing freely.
-
Take care not to deflect the control beyond the point where it can normally be driven by the flight
controls as this will result in a “false positive” - controls are able to move slightly beyond the
normal travel limits but rubbing at these extreme deflections is not dangerous provided there is
no chance of mechanical jamming. Note that for the rudder and elevator the fixed stops fitted at
the rear of the aircraft are located approx 2mm beyond the normal travel limit.
-
Move the control through its normal travel range while pushing against each hinge in the direction
that would close the control clearance with a force of approximately 5-7kg (11
– 15lb).
-
Note if there is any travel restriction caused by the control rubbing against the aircraft.
-
Rectification work is necessary whenever any of the following criteria are met:
-
There is travel restriction caused by the control rubbing against the aircraft.
Figure 15
– Scratches on Rudder
Scratches here indicate the
control has rubbed against the
fin (illustration)