Aircraft Type:
CTSW 2006
LSA; LTF (BFU)
FLIGHT DESIGN
Trim Tab Spring Modification
Page: 5
Rev. No.:
Original Issue Date: 13.10.2006
Revision Date:
8
Install telescopic guide with new spring
The telescopic guide consists of two tubes with washer welded to one end of each, that
slide one in the other. The telescope supports the new spring from inside and is itself
guided by the 5mm diameter rod (pos. 5 in drawing 1). The parts are shown in picture 3.
The new spring has 37 windings and a length of approx. 260mm (the old spring had 35
windings).
Picture 3
To install the spring with telescopic guide, compress the spring and hold it in
compressed state using safety wire or ty-raps. Carefully grease the outside of both
telescopic tubes and the flanges, where the spring will have contact. This is to ensure
smooth operation of the telescopic guide itself and of the spring guided by it, when
installed. Insert the telescopic tubes to the pre-tensioned spring. Insert the 5mm
diameter rod (pos. 5 in drawing 1) to the telescopic guide.
Insert the telescopic system with spring and rod to the lower hole in the shear wall of the
fin (same position than the old spring. Caution, do not use the upper hole / attachment
area!)
Snap the Angle Ball Joint to the Ball Head attached to the Rocker Arm. And secure the
ball head with the safety pin.
Release the spring by removing the safety wires or ty raps, whatever was used. Be
careful to fully remove the complete safety wire or ty raps used as tool.
Depending from the overall adjustment of the elevator the free length between the
spring attachment points might vary for the indicidual plane. The telescope is designed
as to deliver maximum possible guidance in the design operation point. If at your
airplane the unlikely case happens and the telescope comes to a block when trimmed to
max. fast speed, the inner tube of the telescope can be shortened carefully. In this case
take care, that the cutting edges are properly deburred as to allow smooth operation of
the telescope.
Drawing 2 shows the new installation.
