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Old February 3rd 14, 03:03 PM posted to rec.aviation.soaring
Dan Marotta
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Posts: 4,601
Default Replacing TOST release at 10K activations

Does Tost have an exchange program?


"Eric Munk" wrote in message
...
The vast amount of Tost releases get overhauled by Tost themselves, as it
is the only authorized facility to do so in most of Europe. I'd suggest
Tost has a more than fair amount of experience in judging wear and tear on
their releases, also judging by their online publications on release wear,
use and maintenance.

Also, spring failure is not the only limiting factor in lifetime. Spring
tension is too. Compare with Cair, who specifically state spring tension
is
to be measured on a yearly basis.

At 23:41 30 January 2014, son_of_flubber wrote:
On Thursday, January 30, 2014 2:02:14 AM UTC-5, Alan wrote:

it does seem like a rather severely limited lifetime. They
should be using better parts to make their releases last longer - a lot

l=
onger.


10,000 is obviously a NICE ROUND NUMBER that some engineer picked based

on
=
the limited facts at hand at the time. It does not mean that the release
wi=
ll fail at 10,001 cycles, or even 20,000 cycles. 10,000 accounts for the
i=
nability to foresee the effects of the worse case abuse experienced by

the
=
TOST release in the field. =20

When the service person takes a look at the release after 10,000 cycles,
th=
ey might as well replace the parts that might someday fail especially if
th=
at makes the customer feel that they got something of value for the
expense=
of sending the release in for renewal.

Does anyone know what happens to the old springs? Do they get sent back
to=
TOST and are a random sampling of them then tested until failure? The
res=
ults of that testing would confirm that 10,000 was a sufficiently short
ser=
vice life. I doubt that TOST makes that evaluation based on uncontrolled
f=
ailures in the field.