GRAUPNER heim Bell 230 Instructions D'utilisation page 52

Bell 230
1.7.2.2 Installing the support rail
Cut down the channeled rail (B6) to a length of 500 mm, and put the piece you cut off to one
side. Cut the guide tube (B8) to a length of 540 mm and push a ring of fuel tubing onto each end
(cut the rings from the tubing supplied with the mechanics; they should be about 3 mm wide).
Slip the guide tube onto the tail rotor drive shaft (B9).
Place the guide tube in the channeled rail and push the rings of fuel tubing up against the ends
of the rail to clamp the guide tube in place. Wrap a length of adhesive tape round the ends of
the channeled rail to prevent the guide tube falling out of the channel. Fit this assembly into the
tail boom from the front, by-passing the mechanics, until the tail rotor drive shaft (B9) projects
out of the tail, so that it can be screwed in the tail rotor gearbox coupling 4618.40. Now slide it
forward again and connect the front end of the shaft to the quick-release coupling.
Check the length carefully: with the tail rotor bulkhead (A9) resting flat on the tail rotor bulkhead,
there must be at least 1 mm axial clearance between the shaft (B9) and the front coupling yoke.
Slide the channeled rail (B6) back until the distance between the front end and the quick-release
sleeve is about 160 mm.
The next step is to make the cross-support (B7) for the channeled rail (B6); this is made by
trimming the remaining piece of rail to fit across the fuselage. Take care that the rail does not
force the fuselage out of shape, then fix it to both fuselage sides with a drop of thin cyano.
When viewed from above, the shaft should run in a straight line to the coupling yoke 4618.57.
Seen from the side it should describe a gentle, smooth curve. Viewed from the tail end, the shaft
(B9) should run exactly vertical relative to the tail rotor mounting flange.
Remove the tail rotor drive shaft from the fuselage.
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