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RLINDSA2(at)san.rr.com
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 Posted: Mon Feb 04, 2008 8:50 pm Post subject: Mono-wheel gear retraction |
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After being installed for seven years and about 400 flight hours, I am unable to fully retract my landing gear after take-off.
Retraction commences easily enough but resistance rapidly builds and near the end of the stroke resistance builds to a point where I end up with max effort about three mm short of the uplock shoulder. This difficulty has been growing over a period of time--but in the past overcome by pushing harder. Gear extension is easy with no problems.
Is this simply a bungee problem? Have others experienced a bungee age problem where the bungee had to be replaced? If so, how does one attack the replacement procedule? Would a slightly thicker bungee be better? Looks like the job will be quite involved.
Or, if the bungee should still be good, could there be some mechanical or misalignment problem?
Bob Lindsay A077
Gillespie Field (KSEE)
California
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jimca(at)ozemail.com.au
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| Posted: Tue Feb 05, 2008 12:21 am Post subject: Mono-wheel gear retraction |
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Have a look at the pressure being applied to the Flap actuator cross tube during retraction.
I had the same problem and needed to reduce the tube length about 1/4 inch on each side.
As the flaps extend they travel inwards and there is a potential for them to foul and make it dificult to finish the gear up cycle. With load on the wings (slight ) extra diheadral is there so I applied an upload about mid span before I could find what was happening.
Jim McAvoy
Australia 400
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pete(at)lawless.info
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| Posted: Tue Feb 05, 2008 1:07 am Post subject: Mono-wheel gear retraction |
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Hi Bob
Sounds like the bungee gone soft. I replaced mine at 300 hours when on the annual inspection it was impossible to get the gear up with the aeroplane jacked. On a Classic the job involved removing the exhaust and the stainless centre firewall. After that it was straight forward and took less than an hour. Using the standard Europa supplied bungee worked well for me.
Regards
Pete
Classic kit #109
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carl(at)flyers.freeserve.
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| Posted: Tue Feb 05, 2008 1:55 am Post subject: Mono-wheel gear retraction |
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It could be something as simple as lubrication. We had a similar problem (our A/C has been flying about 5yrs).
We raised the plane on a hoist (suspended from engine mounts) and removed wheel and removed/ cleaned rubber block and shock absorbers. We found there was considerable stiffness in the bearings on the landing frame. These were freed by lubricating with teflon spray/ light oil and the U/C cycled a couple of dozen times to work the lube in. We also replaced the rubber block.
The gate through which the operating lever protrudes also needs a light greasing (eg: vaseline).
This has pretty much cured the problem so there is currently no need to tighten up the bungee cord. If this does become necessary it might be easier just to add a couple of lengths of luggage cord using the hook ends to attach to the landing frame and bar on the swinging arm. This could be accessed from the underside.
Replacing the original cord is almost certainly an engine removal (and firewall) job.
Hope this helps resolve your problem.
Carl Pattinson
G-LABS.
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kpaviat(at)verizon.net
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| Posted: Tue Feb 05, 2008 11:20 am Post subject: Mono-wheel gear retraction |
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Hi Bob! I had a similar problem and resolved it by replacing the bungee with same diameter but adding 1 more wrap to the schedule. I believe the drawing shows 6 or 6-1/2 turns, just add one more complete wrap and that should fix it. Replacing the bungee is a bitch but if you use wedges between the cord and the firewall to jam the wraps on the upper cross member it will be easier. Hope this helps!
kp [quote][b]
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