Sunday, March 27, 2016

2008 - Struts and Brakes

The landing gear axle and all the fittings were removed from the landing gear and wing struts.  The metal parts were sand blasted, Zinc Chromate primed and painted with Black enamel. The wooden struts were sanded to remove the old varnish and re-varnished with Marine Spar Varnish.  The fittings were then reinstalled with new hardware.

The landing gear was assembled and bolted back on the fuselage.  The landing gear bracing cables take a lot of abuse.  New 1/8" 1 x 19 cable replaced all the old.  I used the same method we used originally which was 2 Nicopress sleeves.  The first takes the structural loads.  The second just covers the loose end of the cable to prevent snags.  For the second sleeve have the cable installed and rigged tight.  Make the 3 crimps starting with the end toward the first sleeve and work down the cable

 Originally we ran the brake tubes along the front of the gear strut.  They really get beat up in front.  I decided to move them to the back and inboard corner of the struts.  That meant reversing all the fittings from the CUB brakes to turn aft.

I then routed the lines out of the bleeders and around the back of the struts.  There is no hose because the gear is rigid.

 I liked the use of cotton twine to hold the brake lines to the struts.  The twine was varnished after tying it tight.
 Because I'm working in my attic I wanted the gear easily removed.  A union was added in the fuselage where it wouldn't snag moving the fuselage down the steps.  From the union it's a short line to the CUB heal brake cylinder.

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