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Re: 1960 PA-24-250 Alternate Static Source

by N3322G » Fri Aug 29, 2014 2:48 am

Hmmm. I have seen this on other Comanches but don't know how they got it.

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Re: 1960 PA-24-250 Alternate Static Source

by JIMICS2452 » Fri Aug 29, 2014 1:28 pm

Ours was done years ago as a minor modification. Log book entry only. The AP tapped into the static line and put a fuel drain valve in the panel labeled "Static Vent" This is a US airplane.

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Re: 1960 PA-24-250 Alternate Static Source

by Charles Schefer » Sun Aug 31, 2014 1:59 pm

I have one on my 1968 "B" model Twin. I thought (assumed) it was standard. It's a small valve located just under the lower edge of the switch panel to the left of the throttle quadrant.

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Re: 1960 PA-24-250 Alternate Static Source

by Andres Darvasi » Wed Sep 03, 2014 7:21 pm

My aircraft (1969 260C) has one on the lower right side of the throttle quadrant, seems to be original.
See pictures.
I don't know if it works or not, because in my previous aircraft when you opened or closed it the VSI needle moved, and this one doesn't do a thing!

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Re: 1960 PA-24-250 Alternate Static Source

by JIMICS2452 » Thu Sep 04, 2014 11:59 am

Andres, If the VSI or altimeter do not jump a little it is not working. It could be always closed or always open.

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Re: 1960 PA-24-250 Alternate Static Source

by Andres Darvasi » Thu Sep 04, 2014 12:27 pm

That's what I figured Jim, ai will have it checked at annual
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Re: 1960 PA-24-250 Alternate Static Source

by JIMICS2452 » Thu Sep 04, 2014 4:46 pm

I assumed the test was done while airborne.

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Re: 1960 PA-24-250 Alternate Static Source

by Andres Darvasi » Thu Sep 04, 2014 4:48 pm

No, it was down as part of the pre flight while on the ground!

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Re: 1960 PA-24-250 Alternate Static Source

by JIMICS2452 » Fri Sep 05, 2014 4:43 pm

I needs to be done while in flight. It is the speed of the aircraft that creates the pressure difference between the external static ports and the internal aux static port.

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Re: 1960 PA-24-250 Alternate Static Source

by Andres Darvasi » Fri Sep 05, 2014 4:46 pm

Makes sense and I will try in flight. Why did it work in the Cessna 210 and 182 on the ground? Different system?

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Re: 1960 PA-24-250 Alternate Static Source

by VANBLADEREN » Sat Sep 13, 2014 3:15 am

If the VSI or Altimeter does not move when you open there alternate static, then it could also mean that you have a serious static leak. It is unlikely that the alternate static source is not working, but stranger things have happened,

Regard

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Re: 1960 PA-24-250 Alternate Static Source

by Mark Anderson » Sun Sep 14, 2014 3:01 am

William, I have a 61 250 and looked into this before. There is no STC that I found; the best I could tell it would need to be installed under with a 337.

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Re: 1960 PA-24-250 Alternate Static Source

by William Hughes » Sun Sep 14, 2014 11:42 pm

Thanks Mark, appreciate the info.

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