> -----Original Message-----
> From: Jason Armistead
> There ARE more than 3 ADs for IS28s. You need to be careful
> how you look for
> them !
Whoops, should have realised that myself.
> Some are filed under "IS-28" (rather than "IS28") - another 9
> in fact,
> including AD 374 "Fatigue Life Limits" which I think is the
> one that explains
> the trade-off between aerobatic flights and lifetime, ...
Thanks for that heads up on AD374. It may be of interest to some here in SA
with Twin Astirs (not the direct application of the AD but how it came
about).
Anyway, I note that it is a GFA extension _beyond_ the manufacturers limits.
You basically can't have it if you do more than 8% aerobatics (which I would
have thought was plenty, even for the most spin happy clubs) *OR* 500 non
aerotow launches, which pretty much excludes this extension from being
available to any winch clubs (I reckon 500 launches would be about a year or
so worth even for a small country winch club). So as far as this analysis
goes, it would appear type of launch is far more important than any
aerobatics a club may do.
Regards
SWK
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