I remember once listening to a presentation by a professional engineer and
pilot at an EAA meeting.He pointed out that it is very important to make a
permanent mark on the rim(s) and on the tire after tube installation. And t
his should be checked as part of every preflight inspection. Apparently thi
s slippage is quite common=2C regardless of aircraft type=2C when landing o
n hard runways.
Karl
> Subject: Europa-List: Re: Tire /tyre landing incident /accident
> From: butcher43@att.net
> Date: Fri=2C 15 Jul 2011 07:33:58 -0700
> To: europa-list@matronics.com
>
>
> We joined the flat tire mono club this past Tuesday=2C only we think ours
had a different cause=2C not rubbing of the tube in the tire.
>
> We have been doing a lot of training on a hard surface runway. The tire
and tube had in excess of 500 landings on it. We thought before Heather fl
ew on Tuesday that the tire looked a little low and thought the same before
Jim flew after Heather (she did 7 T/O and ldgs). On Jim's 7th landing=2C
the plane slowed quickly and there was a smell of rubber.
>
> When we took the wheel/tire apart we found that the tube was perfect exce
pt the valve stem was pulled off. No holes or rub marks on the tube. Tire
was damaged with a couple of broken cords and a cut on the outside from th
e wheel.
>
> Our conclusion is that the tire was low (we normally run 18 psi) and over
the course of 14 T/O and ldgs with some swerving on the runway=2C the tire
pulled from the bead of the wheel and rotated causing the valve stem to be
pulled off.
>
> The damaged tire was a US Speciality Tire AIR TRAC size 7.00 x 6 6 ply ra
ting and the tube was a Cheng Sing (we think we got the tube from Europa UK
).
>
> We were able to get a Goodyear Flight Custom II tire locally and fitted o
ur spare tube that is Chinese and purchased from Wicks Aircraft supply=2C P
art Number TB-MTAT8X6 (tubes with the 90 deg valve stem are not listed on D
resser Tire or ACS websites). The only marking on the tube is "Quality Ass
ured" and some Chinese characters! The new tire seems to have a flatter tr
ead and doesn't bulge as much. Landings yesterday with it on pavement were
no different than previously.
>
> We always use a lot of talcum when fitting a tube. We inflate a new tube
outside the tire first to get out wrinkles. Then we deflate it=2C talcum
it (talcum the tire too)=2C insert into the tire and inflate. Then deflate
again=2C and fit the wheel (usually twice since we forget the spacer!!).
Inflate again and deflate again. Finally inflate the final time to 18 psi.
Be sure the valve stem is aligned with the red dot on the tire for balanc
e.
>
> When we got our Europa wheel=2C we found the opening for the valve stem w
as quite rough. We filed and sanded it to make it as large and smooth as p
ossible. We used Scotchbrite to clean the wheel before fitting the new tir
e and tube. There was a lot of rubber debris on the bead and even inside t
he wheel.
>
> Jim & Heather
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=346502#346502
>
>
>
>
>
>
>
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