---------------------------------------------------------- Yak-List Digest Archive --- Total Messages Posted Sun 06/06/10: 5 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 11:52 AM - Pitot Static System Issues (PSalter@aol.com) 2. 12:22 PM - Re: Pitot Static System Issues (Tom Elliott) 3. 01:02 PM - Air start valve rebuild (Cpayne) 4. 01:18 PM - Re: Pitot Static System Issues (A. Dennis Savarese) 5. 06:04 PM - Re: Air start valve rebuild (Kelley Monroe) ________________________________ Message 1 _____________________________________ Time: 11:52:01 AM PST US From: PSalter@aol.com Subject: Yak-List: Pitot Static System Issues What is the purpose for the sensors behind the instrument panel, connected to the pitot system? Low airspeed or overspeed sensors? I have one that seems to be a clog in the system keeping the airspeed indicator from working. Any help is appreciated. Phil ________________________________ Message 2 _____________________________________ Time: 12:22:57 PM PST US From: "Tom Elliott" Subject: RE: Yak-List: Pitot Static System Issues What type and model aircraft? Tom Elliott CJ-6A NX63727 702-595-2680 _____ From: owner-yak-list-server@matronics.com [mailto:owner-yak-list-server@matronics.com] On Behalf Of PSalter@aol.com Sent: Sunday, June 06, 2010 11:50 AM Subject: Yak-List: Pitot Static System Issues What is the purpose for the sensors behind the instrument panel, connected to the pitot system? Low airspeed or overspeed sensors? I have one that seems to be a clog in the system keeping the airspeed indicator from working. Any help is appreciated. Phil ________________________________ Message 3 _____________________________________ Time: 01:02:38 PM PST US From: Cpayne Subject: Yak-List: Air start valve rebuild The Chinese air start valve is the QDF-1. I'm told that the Yak uses the same valve but not having a Yak available, I can't say from personal experience. Does anyone have an interest in getting their spare valve rebuilt? Not just the seals but a stainless steel "bottom" inlet where all the trouble starts. I'm thinking of setting up do do several. Let me know off-list if you are interested, no certain cost at this time but the end result should result in a longer lasting unit than the original. Craig Payne ________________________________ Message 4 _____________________________________ Time: 01:18:54 PM PST US From: "A. Dennis Savarese" Subject: Re: Yak-List: Pitot Static System Issues The pitot and static lines going to the front instrument panel are connected to the disabling solenoids which are controlled by the disabling switches in the rear cockpit. You can reroute the hoses connected to the solenoids going to the airspeed indicator. Look for the black and white 6 mm lines on the left side of the fuselage with the rubber hoses connected to them that go to the disabling solenoids. These lines run vertically behind the left side panel. Bypass the two solenoids with new 1/4" or 6 mm ID rubber hoses and go directly to the airspeed indicator. One word of caution if you still have the original Russian VSI in the front cockpit. When you eliminate all of the disabling solenoids the Russian VSI will not function properly because it has a second hose connected to it which goes to the bleed off capillary in the instrument. The rear VSI does not have the second hose going to it even though the face of the instruments look identical. Hope this helps. Dennis ----- Original Message ----- From: PSalter@aol.com To: Yak-List@matronics.com Sent: Sunday, June 06, 2010 1:49 PM Subject: Yak-List: Pitot Static System Issues What is the purpose for the sensors behind the instrument panel, connected to the pitot system? Low airspeed or overspeed sensors? I have one that seems to be a clog in the system keeping the airspeed indicator from working. Any help is appreciated. Phil ________________________________ Message 5 _____________________________________ Time: 06:04:06 PM PST US From: "Kelley Monroe" Subject: Re: Yak-List: Air start valve rebuild Hi Craig, Do you know the cost and the time frame? ----- Original Message ----- From: "Cpayne" Sent: Sunday, June 06, 2010 3:01 PM Subject: Yak-List: Air start valve rebuild > > The Chinese air start valve is the QDF-1. I'm told that the Yak uses the > same valve but not having a Yak available, I can't say from personal > experience. Does anyone have an interest in getting their spare valve > rebuilt? Not just the seals but a stainless steel "bottom" inlet where all > the trouble starts. I'm thinking of setting up do do several. > > Let me know off-list if you are interested, no certain cost at this time > but the end result should result in a longer lasting unit than the > original. > > Craig Payne > > > ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message yak-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Yak-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/yak-list Browse Digests http://www.matronics.com/digest/yak-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.