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Pitot system testing

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jfrjr(at)roadrunner.com
Guest

Posted: Thu Nov 19, 2009 3:54 pm Post subject: Pitot system testing

I have tested my pitot system using the EZ homemade system.  Works well with my indicated AS right on the mark.  But I have a slow leak that I can not find.  Loses about 1 knot every 3 to 4 minutes. A little faster loss at higher manometer pressures.  The leaks seems to stop when the manometer pressure gets to about 7.5 inches (105 Knots).  Is this acceptable?  Any advice on how to find leak--I have "soapy bubble tested" all connections.  Thanks.  Jay rowe

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ricksked(at)embarqmail.co
Guest

Posted: Thu Nov 19, 2009 6:12 pm Post subject: Pitot system testing

You may want to check the tray if you have a TruTrak AP installed, I had an issue with the tray when testing the panel alone. I have a similar drop in pressure right now but the system matches right up with the GPS speed & altitude so It doesn't appear to be an issue. I plan on having the pitot/static check completed soon which may or may not tell me I have a problem. The ballon test works pretty well for now. Maybe an instrument guru can tell us if there is some allowed blowby in the instruments themselves. All of my connections are confirmed not to leak so it's going somewhere. The only place I can think is internally on the instrument itself.



Rick Sked

N246RS

---

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billderou(at)yahoo.com
Guest

Posted: Fri Nov 20, 2009 7:43 am Post subject: Pitot system testing

Hi Jay-

 You have not said much about your tubing - rigid or hose. However, I also made an EZ home setup that works great. Some of my findings:

  

 If you have a Tygon hose setup check your supply of plastic fittings. Cheap ones have flashing on the barbs that create leaks. Best source for "fresh or soft" Tygon and fittings is www.usplastics.com. This is the approach I took and passed two official pitot/static tests with "zero leakage".

  

 Also, if you have vinyl hose on your test setup it is guaranteed to leak and the leak will change with temperature.

  

 Looks like your getting close.

  

 Bill DeRouchey

 N939SB

  



--- On Thu, 11/19/09, Rick Sked <ricksked(at)embarqmail.com> wrote:



 [quote]

From: Rick Sked <ricksked(at)embarqmail.com>

Subject: Re: Pitot system testing

To: rv10-list(at)matronics.com

Date: Thursday, November 19, 2009, 6:08 PM



 --> RV10-List message posted by: Rick Sked <ricksked(at)embarqmail.com (ricksked(at)embarqmail.com)>



You may want to check the tray if you have a TruTrak AP installed, I had an issue with the tray when testing the panel alone. I have a similar drop in pressure right now but the system matches right up with the GPS speed & altitude so It doesn't appear to be an issue. I plan on having the pitot/static check completed soon which may or may not tell me I have a problem. The ballon test works pretty well for now. Maybe an instrument guru can tell us if there is some allowed blowby in the instruments themselves. All of my connections are confirmed not to leak so it's going somewhere. The only place I can think is internally on the instrument itself.



Rick Sked

N246RS

---

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wcurtis(at)nerv10.com
Guest

Posted: Fri Nov 20, 2009 8:49 am Post subject: Pitot system testing

FYI.  There is no regulatory pitot check and so no such thing as a pitot/static check.  Only the static system and your transponder reporting system is checked.  Don't assume that your pitot system is checked as part of a standard 91.411 or 91.413 certification. 

 

 On Thu, Nov 19, 2009 at 9:08 PM, Rick Sked <ricksked(at)embarqmail.com (ricksked(at)embarqmail.com)> wrote:

  	  Quote: 	
		  --> RV10-List message posted by: Rick Sked <ricksked(at)embarqmail.com (ricksked(at)embarqmail.com)>

 

You may want to check the tray if you have a TruTrak AP installed, I had an issue with the tray when testing the panel alone. I have a similar drop in pressure right now but the system matches right up with the GPS speed & altitude so It doesn't appear to be an issue. I plan on having the pitot/static check completed soon which may or may not tell me I have a problem. The ballon test works pretty well for now. Maybe an instrument guru can tell us if there is some allowed blowby in the instruments themselves. All of my connections are confirmed not to leak so it's going somewhere. The only place I can think is internally on the instrument itself.

 

Rick Sked

N246RS

  



	


-- 

William

N40237 - http://wcurtis.nerv10.com/

  [quote][b]

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ricksked(at)embarqmail.co
Guest

Posted: Fri Nov 20, 2009 9:23 am Post subject: Pitot system testing

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">   Wasn't implying a certified check but a check that uses equipment verify the accuracy of the system...FWIW my static pressure holds pressure

Sent via BlackBerry by AT&TFrom:  William Curtis <wcurtis(at)nerv10.com> 

Date: Fri, 20 Nov 2009 11:40:34 -0500

To: <rv10-list(at)matronics.com>

Subject: Re: RV10-List: Pitot system testing

FYI.=A0 There is no regulatory pitot check and so no such thing as a pitot/= static check.=A0 Only the static system and your transponder reporting syst= em is checked.=A0 Don't assume that your pitot system is checked as par= t of a standard 91.411 or 91.413 certification.=A0

 On Thu, Nov 19, 2009 at 9:08 PM, Rick Sked <ricksked(at)embarq= mail.com (ricksked(at)embarqmail.com)> wrote:

  	  Quote: 	
		  --> RV10-List message posted = by: Rick Sked <ricksked(at)embar= qmail.com (ricksked(at)embarqmail.com)>

You may want to check the tray if you have a TruTrak AP installed, I ha= d an issue with the tray when testing the panel alone. I have a similar dro= p in pressure right now but the system matches right up with the GPS speed = & altitude so It doesn't appear to be an issue. I plan on having th= e pitot/static check completed soon which may or may not tell me I have a p= roblem. The ballon test works pretty well for now. Maybe an instrument guru=  can tell us if there is some allowed blowby in the instruments themselves.=  All of my connections are confirmed not to leak so it's going somewher= e. The only place I can think is internally on the instrument itself.

Rick Sked

N246RS

-- 

William

N40237 - [url=h= ttp://wcurtis.nerv10.com/]http://wcurtis.nerv10.com/[/url]

  [quote][b]

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Kellym

Joined: 10 Jan 2006
Posts: 1705
Location: Sun Lakes AZ

Posted: Fri Nov 20, 2009 12:31 pm Post subject: Pitot system testing

If you are going to fly where a transponder and encoder are required, a 

static system check is required. If you care about protecting your 

airspeed instrumentation, the pitot system must be connected and 

maintained at the same pressure as the static system, otherwise you will 

overspeed the airspeed indicator once the static system is raised to 

altitude. As you say, it isn't regulatory, it is good safe practice for 

the instruments. A side benefit is that the airspeed can be verified at 

the same time.

Some of us have the joy of operating under a mode C veil for our home 

base, making encoder and certification mandatory before first flight.



William Curtis wrote:

 	  Quote: 	
		   FYI.  There is no regulatory pitot check and so no such thing as a 

 pitot/static check.  Only the static system and your transponder 

 reporting system is checked.  Don't assume that your pitot system is 

 checked as part of a standard 91.411 or 91.413 certification. 

 

 On Thu, Nov 19, 2009 at 9:08 PM, Rick Sked <ricksked(at)embarqmail.com 

 <mailto:ricksked(at)embarqmail.com>> wrote:

 

     

     <mailto:ricksked(at)embarqmail.com>>

 

     You may want to check the tray if you have a TruTrak AP installed, I

     had an issue with the tray when testing the panel alone. I have a

     similar drop in pressure right now but the system matches right up

     with the GPS speed & altitude so It doesn't appear to be an issue. I

     plan on having the pitot/static check completed soon which may or

     may not tell me I have a problem. The ballon test works pretty well

     for now. Maybe an instrument guru can tell us if there is some

     allowed blowby in the instruments themselves. All of my connections

     are confirmed not to leak so it's going somewhere. The only place I

     can think is internally on the instrument itself.

 

     Rick Sked

     N246RS

 

 -- 

 William

 N40237 - http://wcurtis.nerv10.com/

 

 *

 

 

 *

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_________________
Kelly McMullen
A&P/IA, EAA Tech Counselor # 5286
KCHD

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