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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