com>
> but what is the best way to check out the plumbing of the pitot static
> system? Also, do other people test their pitot static instruments 'in
> situ', by adding pressure/vacuum directly to the pitot head? This would
> appear to test the whole system - but how would you know whether any
> errors lay in the instruments or in the plumbing.
>David
David
I can lend you a callibration instrument but it's rather bulky.
Checking the Pitot line is easy, use a few feet of Europa's old PVC 5/16
bore sight gauge tube and push it over the end of the pitot. Carfeully blow
into it , watching the ASI reading and get it up to 100kts or so, then
block the end of the tube with your tongue. You could clamp it to close off
the pipe. Wait and watch. The reading should remain constant for an
indefinite time. 30 seconds would be enough to verify there are no leaks.
I used to do this as part of a rigging check .
Checking the static line for leaks is not quite so easy but a similar
method could be used but using suction instead of pressure. You would need
to disconnect the static line from the Pitot assemble, then connect to it.
I haven't forgotten about my offer to you BTW. Still struggling a bit but
dust is slowly settling.
Graham
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