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testing alti

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europa(at)pstewart.f2s.co
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Posted: Wed Feb 13, 2008 11:36 am Post subject: testing alti

If I want to get some idea if my altimeters are reading anything like 

(or reading at all), could I do this by connecting the static line to  

a U tube manometer and generating the relevant -ve presure - (I found  

a chart of altitude vs pressure)?



Also I was envisaging doing the same for ASI but cant find any sort  

of reference re differential pressure vs airspeed.



Regards



Paul

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jan.de.jong(at)xs4all.nl
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Posted: Wed Feb 13, 2008 2:08 pm Post subject: testing alti

Hallo Paul,

Have a look at this:

http://www.eaa1000.av.org/technicl/instcal/instcal.htm

Regards,

Jan de Jong

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budyerly(at)msn.com
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Posted: Wed Feb 13, 2008 2:14 pm Post subject: testing alti

<?xml:namespace prefix="v" /><?xml:namespace prefix="o" /><![endif]-->  Paul,

 When I need a quick and dirty Pitot Static check, my local avionics shop  told me this one and I use it when I build panels.  I will suck the static  line down to 1 inch hg pressure which is 1000 feet and pinch the line.

  

 The airspeed is going to come up to 135 Knots and both should  hold.  You may need to disconnect your vsi if it vents excessively.   No special equipment necessary.  The cost of having a certified shop give  you a check is not prohibitive.  Have them guarantee that they will check  the panel when done (prior to installation) and after final assembly for one  price.

  

 The pitot I do not check as the main problem with airspeed indicators is  the static side.

  

 For true functionality to include the altitude encoder, there is no  replacement for a proper P&S check by a suitable avionics shop.  

 Bud Yerly

 [quote]   ---

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europa(at)pstewart.f2s.co
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Posted: Thu Feb 14, 2008 10:18 am Post subject: testing alti

Thanks folks



What I'm after at the moment is a 'quick and dirty' check that the  

stuff even works. So thanks for the ideas I'll get to it.



Regards

Paul

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