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Possible pitot static pressure problem

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william(at)wbliss.co.uk
Guest

Posted: Sat Dec 23, 2017 1:03 pm Post subject: Possible pitot static pressure problem

Hi All



Maybe someone can help with these two problems - are they connected?:



1. My VSI has started reading 100ft descent/min - even when I am parked 

on the ground. When it reads zero in flight I am actually climbing.



2. My Transponder (old Narco unit) has started indicating about 2000ft 

higher than I actually am.



I think both occured at about the same time.



I am about to fit a new Trig transponder and so will check the visible 

pipes for condition etc. Does this combination ring any bells?



Happy Christmas and New Year



William Bliss G-WUFF

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Burrilla

Joined: 25 Apr 2015
Posts: 184

Posted: Sat Dec 23, 2017 1:11 pm Post subject: Possible pitot static pressure problem

If you disconnect the Static line from both and leave to open air, on the ground of course, then at least eliminates a common blockage. 



Water in the lines?



Or could simple be a need to adjust the zero on the VSI and a faulty encoder on the transponder. 



Alan



Sent from my iPhone



 	  Quote: 	
		   On 24 Dec 2017, at 04:05, William Bliss <william(at)wbliss.co.uk> wrote:

 

 

 

 Hi All

 

 Maybe someone can help with these two problems - are they connected?:

 

 1. My VSI has started reading 100ft descent/min - even when I am parked on the ground. When it reads zero in flight I am actually climbing.

 

 2. My Transponder (old Narco unit) has started indicating about 2000ft higher than I actually am.

 

 I think both occured at about the same time.

 

 I am about to fit a new Trig transponder and so will check the visible pipes for condition etc. Does this combination ring any bells?

 

 Happy Christmas and New Year

 

 William Bliss G-WUFF

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Ivor

Joined: 23 Jul 2015
Posts: 51

Posted: Sun Dec 24, 2017 12:29 am Post subject: Re: Possible pitot static pressure problem

the Trig transponder has it’s own built in altitude encoder that is easily adjusted if needed( mine was spot on) so as been said leave your static off and check for blockages in the pipe work,

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Ron Jones

Joined: 25 Apr 2008
Posts: 19
Location: UK

Posted: Sun Dec 24, 2017 2:30 am Post subject: Possible pitot static pressure problem

A ft BBC

 

 

 Get Outlook for Android

 

 

 

 On Sun, Dec 24, 2017 at 8:34 AM +0000, "Ivor" <g-iver(at)live.co.uk (g-iver(at)live.co.uk)> wrote:

 

   	  Quote: 	
		         	  Quote: 	
		  --> Europa-List message posted by: "Ivor" 



the Trig transponder has itâs own built in altitude encoder that is easily adjusted if needed( mine was spot on) so as been said leave your static off and check for blockages in the pipe work,





Read this topic online here:



http://forums.matronics.com/viewtopic.php?p=476733#476733

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