COMCO IKARUS
Maintenance Manual C42 Series
MaintenanceManual C42-
Series_Issue_VII_18.02.2014.doc
Revison No.:1 48 from 107
4 Servicing the C42
4.1 General maintenance information
This chapter contains all the important information and regulations concerning the
handling and maintenance of the Ikarus C42. It is essential that you read this chapter
before undertaking any maintenance or repair work.
4.1.1 Safety elements
As customary in aircraft manufacturing, all connections in the C42 are safetied in one
way or another. The following safetying elements are to be found in the C42:
−
Self-locking nuts
i. with plastic insert
ii. Clevelock nuts (in hot areas)
−
Safety rings
i. main bolts
ii. drilled bolts
−
Safety pins (e.g. rod ends)
−
Safety wire (e.g. screws in engine compartment)
−
Locking plates (torsion tubes, flight controls)
−
Loctite (e.g. blind thread bore-holes)
−
Cotter pins (e.g. connections with castle nuts)
4.1.2 Screw connections
Screw connections of various dimensions are to be found in the C42. This
construction is typical for Ikarus aircraft and has the advantage of allowing damaged
parts to be easily and economically replaced. The screws are usually made of
stainless steel in accordance with the standard DIN A2-70. High-strength, electro-
galvanised standard screws (e.g. 8.8) are used for highly-stressed connections.
Rules for handling the screw connections of the C42:
−
Appropriate washers must be placed under the nuts used to connect
aluminium elements.
−
To allow the further use of DIN standard measurements, in some cases
several washers are used. At highly-stressed points, this procedure
ensures that only the bolt shank carries the load in the boreholes. For this
reason, the same type of screws must be installed in the same way during
maintenance and repair work!
−
For safety reasons, all self-locking nuts (plastic or Clevelock) may only be
used once.
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