Lark life extension

[lanebush]

I am researching the IS28B2 Lark for our club. From what I can tell
these aircraft reach their life limit around 2014. Am I correct in
this deduction? The info is pretty scarce. In fact I can not find a
copy of EO-24 anywhere on the web. If this is true, is everyone
planning to convert to experimental catagory? Am I correct in saying
that under experimental catagory commercial operations will not be
possible?

Thanks for any input.

XF

[[email protected]]

On Mar 16, 11:38*am, lanebush > wrote:
> I am researching the IS28B2 Lark for our club. *From what I can tell
> these aircraft reach their life limit around 2014. *Am I correct in
> this deduction? *The info is pretty scarce. *In fact I can not find a
> copy of EO-24 anywhere on the web. *If this is true, is everyone
> planning to convert to experimental catagory? *Am I correct in saying
> that under experimental catagory commercial operations will not be
> possible?
>
> Thanks for any input.
>
> XF

You are correct re experimental and commercial use.
You should also not assume that moving to experimental precludes
applicating of manufacturer specified life limits.
The FAA goes by manufacturer's approved data.
FWIW
UH

[Frank Whiteley]

On Mar 16, 9:38*am, lanebush > wrote:
> I am researching the IS28B2 Lark for our club. *From what I can tell
> these aircraft reach their life limit around 2014. *Am I correct in
> this deduction? *The info is pretty scarce. *In fact I can not find a
> copy of EO-24 anywhere on the web. *If this is true, is everyone
> planning to convert to experimental catagory? *Am I correct in saying
> that under experimental catagory commercial operations will not be
> possible?
>
> Thanks for any input.
>
> XF

Larks have gone through multiple life extensions, which have little or
nothing to do with airframe hours, but do require calendar-based
special inspections. It's more like a shelf-life. Anyone know if 35
years was the final extension? The example you are looking at
apparently was built about 1978, but construction continued into the
mid-1990's. There are a couple for sale on segelflug.de built in 1988
and 1989 priced at 8000E each. There are a couple of L-13's on there
also you might look over if in your price range.

FWIW, some Aussies did a study on three high-time Larks several years
ago and presented to OSTIV. IIRC, they concluded aerobatics should be
stopped at 14,500 hours. I know about one here in the US that had the
skin separate from the spar due to water in the wings freezing and
thawing in western Colorado. That was repaired and it is operating
with a club in the south. Corrosion seems to have been the major
shelf life concern as many were left tied out instead of protected.

Frank Whiteley

[Frank Whiteley]

On Mar 16, 12:52*pm, Frank Whiteley > wrote:
> On Mar 16, 9:38*am, lanebush > wrote:
>
> > I am researching the IS28B2 Lark for our club. *From what I can tell
> > these aircraft reach their life limit around 2014. *Am I correct in
> > this deduction? *The info is pretty scarce. *In fact I can not find a
> > copy of EO-24 anywhere on the web. *If this is true, is everyone
> > planning to convert to experimental catagory? *Am I correct in saying
> > that under experimental catagory commercial operations will not be
> > possible?
>
> > Thanks for any input.
>
> > XF
>
> Larks have gone through multiple life extensions, which have little or
> nothing to do with airframe hours, but do require calendar-based
> special inspections. *It's more like a shelf-life. *Anyone know if 35
> years was the final extension? *The example you are looking at
> apparently was built about 1978, but construction continued into the
> mid-1990's. *There are a couple for sale on segelflug.de built in 1988
> and 1989 priced at 8000E each. *There are a couple of L-13's on there
> also you might look over if in your price range.
>
> FWIW, some Aussies did a study on three high-time Larks several years
> ago and presented to OSTIV. *IIRC, they concluded aerobatics should be
> stopped at 14,500 hours. *I know about one here in the US that had the
> skin separate from the spar due to water in the wings freezing and
> thawing in western Colorado. *That was repaired and it is operating
> with a club in the south. *Corrosion seems to have been the major
> shelf life concern as many were left tied out instead of protected.
>
> Frank Whiteley

There's an L-13 in the SSA classifieds also.

Frank

[Rob.Russell]

On Mar 16, 2:54*pm, Frank Whiteley > wrote:

> There's an L-13 in the SSA classifieds also.

I'd rather they buy our L-13, though I'll be sad to see it go:
http://sosaglidingclub.com/blanik/

(Or pair of new K21s last season has cut in on her popularity)

[Frank Whiteley]

On Mar 16, 1:51*pm, "Rob.Russell" > wrote:
> On Mar 16, 2:54*pm, Frank Whiteley > wrote:
>
> > There's an L-13 in the SSA classifieds also.
>
> I'd rather they buy our L-13, though I'll be sad to see it go:http://sosaglidingclub.com/blanik/
>
> (Or pair of new K21s last season has cut in on her popularity)

I don't see it listed on sac.ca

[Bob Kuykendall]

I hear they're doing a remake of Escape from New York...

[Rob.Russell]

On Mar 16, 4:03*pm, Frank Whiteley > wrote:
> On Mar 16, 1:51*pm, "Rob.Russell" > wrote:
> > I'd rather they buy our L-13, though I'll be sad to see it go:http://sosaglidingclub.com/blanik/
> I don't see it listed on sac.ca

I'll investigate to determine the relevant volunteer and ensure that
his pay is appropriately docked.