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    Re: A-10 Sextant Maintenance Manual
    From: Jean-Philippe Planas
    Date: 2007 Dec 13, 12:22 -0800
    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?


    Thomas Kleemann <Rule_No.1{at}web.de> wrote:


    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).


    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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