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8. Repairs
8.1 Replacement of screws
In the case of corrosion, bending or cracking of the screws, it is necessary to replace them. If
thread is damaged, it is necessary to replace the screw and the nut. It is permitted to replace
the screw or nut with a new one only of same quality and specifications. Safety nuts with
plastic rings can be used only once. Safety metal nuts can be used at most 3 times after
compressing the safety ring with tongs.
8.2 Repairs of rivet joints
When the rivet joint is damaged (loose), it is necessary to remove the damaged rivet or its
remainder, check if the joint areas are not damaged and fasten the joint with rivet. If the joint
is damaged, it is necessary to replace the parts or consult the repair with the producer of the
airplane. Use the same quality and type of rivet when repairing a joint.
8.3 Controls repairs
Connecting rods, connection parts, control cables, bearings and other parts of flight controls
can not be damaged in any way. Individual parts must be replaced only by original parts
delivered by the producer. If any relevant damage to flight controls or visible gap occurs, the
service center of the producer can repair them. Test flight performed by a test pilot is a must
after any flight controls repair.
8.4 Airframe repairs
The damaged surface can be patched, sanded down and varnished only when it is damaged
slightly. When perforation or other light damage to non load-bearing parts occurs (engine
cowlings, wheel fairings) the repairs are executed by laminating one or two layers of the
fiberglass, patching the outside surface, sanding it down and varnishing the surface. The
patching should be done with two-component body filler according to directions for use.
Major damages to the airframe or its perforations are necessary to consult with the producer
who will consider the effect of the damage on the resistance of the construction and will
determine the correct repair.
8.5 Fuel system repairs
If loose connections in the fuel system are detected repair must be done immediately. Non
significant failures (for example loose coupling of fuel lines or filter fouling) can be repaired by
the user of the airplane. Other repairs must be done only in the service center of the
producer.
8.6 Engine repairs
All engine and engine components repairs must be performed only at the service center of
the producer. Engine malfunction and other flaws can be signalized by unnatural noise
coming from the engine mount area, increased vibrations, engine speed fluctuation, lower
power output, fire smell, if the engine operational values are not in “the green”, bad starting,
etc.
Flight Manual Page 37 of 40
