Crossfeed in LS8 wing tanks?

At 16:00 06 August 2014, Papa3 wrote:
On Wednesday, August 6, 2014 10:30:03 AM UTC-4,
wrote:
I have an LS8sT (from DG) which is exhibiting the same problem, leaking
f=
rom the outer tank to the inner tank - its a later one (post Sn 8500),
and
=
my manual says to fill the outer tanks first.
=20
=20
=20
Does anyone have any experience with these?

Hi,

I haven't looked at the TM library in a long time, but I have to believe
it=
is the same problem. The tanks were not designed to cross-feed from
inner=
to outer, and IIRC the only way for water to flow was through the
venting
=
system. Shouldn't be too hard to observe if you can put a wing
partially
=
filled with water on a saw horse and stick a cheap boroscope up against
the=
point where the tubes run through the bulkhead/rib. =20

P3


Having continued to scour the internet I've come across this

http://www.dg-flugzeugbau.de/Data/TM-LS/LS8/TM8012.pdf

The implication is that later serial numbers shouldn't have TB 8006
applied,
also it would seem unlikely that the design wasn't changed following a
mandatory AD.

What is that additional drain point for? Where does it exit the wing?
Presumably it is blocked off at some point?

We finally resolved the issue of water leaking from the outer tank to the
inner tank. It was a poor seal around the outer tank's breather tube where
it passed through the bulkhead from the outer tank to the inner tank. The
main problem that the repairers had was getting the resin/cotton floss mix
around the side of the tube where it was nestling up against the main spar.
Fortunately? they had already made a hole in the inner tank expecting to
have to replace the release cable gaiter (which was fine as it turned out).
However they had to remove one of the fibreglass straps holding the tube
in place so they could move the tube to get behind it. Now looking forward
to next season so I can re-start my experience of flying with water.

At 22:26 06 August 2014, Geoff Brown wrote: