RLINDSA2(at)san.rr.com
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 Posted: Sun Mar 16, 2008 9:57 pm Post subject: MONO-WHEEL GEAR RETRACTION |
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Last month I wrote that I had landing gear retraction problems in an XS about 7 years old and 400 hrs flight time. Several of you made useful suggestions--mostly to tighten or replace the bungee. Thank you for your respones.
On repair, this is what I found.
I placed the aircraft up on jacks and removed the main wheel to make room to work on the bungee. Before I started on the bungee I tried retraction to see if I could do it without the 25 lbs of wheel and brake. I could not--even with someone else pushing on the swing arm. Closer examination revealed a wet looking hydraulic damper on the right side. But even more interesting was just a little bit of the polyurethane shock block squeezed out on the right side--and it was evident that it was rubbing on the swing arm as it neared full retraction. I removed and replaced both dampers and the shock block. The wet looking damper had little resistance. I also replaced the EUR 026 bolt that goes through the top of the dampers because it was slightly bent also on the right side. Before I replaced the shock block/damper assembly I tightened the bungees which wasn't too difficult working alone with adequate space and a little wedge to hold the bungee as I worked along the loops. (Thanks Kim Prout!)
Also while I was there I removed the Matco parking brake because it had not been holding. At first I was just going to change to the spare channel on the Matco but the replacement of O-rings is easy and cheap (Matcomfg.com).
Everything reassembled, I was ready for the big test. Surprise. The outriggers did not fully retract. I removed the speed fairings and found that both push rods (OR5) were very badly bent and jamming on the outboard W21 side plates. Furthermore, the slots in the push rods were badly gouged in one spot as if the full length of the slot was not being used. I replaced the push rods, lublicated appropriately and tried retraction once more. Worked better than ever--just as advertised.
One advantage of having operational problems is that after overcoming them, one can be more astute in pre-flight inspections.
Bob Lindsay A 077
Gillespie Field, KSEE
San Diego CA
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