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    Re: A-10 Sextant Maintenance Manual
    From: John D
    Date: 2007 Dec 14, 16:13 -0800

    My sincere thanks for all the good information. My memories ov
    standing on a bench, head in the astrodome, and seeing a thousand
    times more stars than from the ground. You guys are great.
    Arthur Hill, Philadelphia
    On Dec 13, 3:22�pm, jean-philippe planas
    > Hello Thomas,
    > Yes it's a good idea and anyway it goes in the correct direction to keep/form a suitable bubble.
    > Has anyone on the List experimented this technique?
    > JPP
    > Thomas Kleemann  wrote:
    > Hello,
    > I've got no experience with aircraft sextants at all, but if you wish
    > to achive overpressure in a liquid filled container then put it into a
    > freezer prior to sealing.
    > When it get back to ambient (room) temperature the pressure rises and
    > therefore the bubble shrinks.
    > The exterior temperatures in flight are a little bit harsher than what
    > your freezer can provide, so your sextant is not endangered (xylene's
    > melting point is around -50 centigree, hexane's is even lower).
    > /Thomas
    > jean-philippe planas schrieb:
    > > It is also my experience that all bubble assemblies gradually loose part
    > > or all of their xylene over time without any obvious leak or xylene
    > > characteristic smell.
    > > I have reconditionned 4 A10 or A10As and 5 bubble units and they all
    > > lost part of their xylene in a matter of months.
    > > Without refilling the assemblies in a low pressure container I don't
    > > think we can do any better.
    > > If anybody has a better experience on A10s, please speak up!
    > > JPP
    > ---------------------------------
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