samifer Posted November 2, 2014 Report Share Posted November 2, 2014 So the other day im flying along minding my own business and all of a sudden on my main screen a warning pops up telling me that my 2 speed sensors are out of sync and i have to chose witch one to fly off of .... so i look at my Garmin and go with the closest one (one was reading 110kn and the other was reading 90kn) after about 20 min the prob seemed to go away. As i approached my airport and about to join the circuit this happens again! but now those 20 kn means allot more! I again pick the one closest to the gps speed what im wondering is what happened? could one of my pitot tubes be icing up ?? Link to comment Share on other sites More sharing options...
Anticept Posted November 2, 2014 Report Share Posted November 2, 2014 The lines have to be blown out once in a while or they accumulate water in a low point in the system. The pitot tube can also get a little frost impact obstruction. I really don't like the dynon pitot tube booms because they have no drain. Nor did FD install a drain in the pitot or static lines to make it easy to purge the system. Link to comment Share on other sites More sharing options...
samifer Posted November 2, 2014 Author Report Share Posted November 2, 2014 when you say "blow it out" .... like with compressed air ?? Link to comment Share on other sites More sharing options...
Anticept Posted November 2, 2014 Report Share Posted November 2, 2014 first disconnect and take off the pitot tube and blow it out with compressed air to see if that fixes the issue (be sure to mark which line is which for the tube!). If not, put a blown up balloon on the pitot tube and tie it down. If it deflates within a few minutes, you have a pitot leak. See if you can figure out a way to do it to the static port too. If the balloon test passes, then you need to disconnect all your instrumentation, and blow compressed air into the lines. DO NOT LEAVE INSTRUMENTS CONNECTED OR YOU WILL DAMAGE THEM. Depending on your regulations, you may be required to have the pitot-static system tested once it has been opened. Link to comment Share on other sites More sharing options...
samifer Posted November 2, 2014 Author Report Share Posted November 2, 2014 Thank you so much i will try all this out when i see my baby again ! Link to comment Share on other sites More sharing options...
FlyingMonkey Posted November 3, 2014 Report Share Posted November 3, 2014 If both systems are coming off the same pitot source...wouldn't they read the same? It could still be wrong due to water or obstruction, but the pitot pressure reaching each device should be the same unless the obstruction was in the line between the two devices. This could be a calibration or software/hardware issue on one of the speed sensors. Link to comment Share on other sites More sharing options...
Anticept Posted November 3, 2014 Report Share Posted November 3, 2014 If both systems are coming off the same pitot source...wouldn't they read the same? It could still be wrong due to water or obstruction, but the pitot pressure reaching each device should be the same unless the obstruction was in the line between the two devices. This could be a calibration or software/hardware issue on one of the speed sensors. Depends on plumbing. There are always high and low points. It is cheaper to clean the system than to start replacing and finding out later there was pooled water Link to comment Share on other sites More sharing options...
FlyingMonkey Posted November 3, 2014 Report Share Posted November 3, 2014 Depends on plumbing. There are always high and low points. It is cheaper to clean the system than to start replacing and finding out later there was pooled water Oh sure, always try the cheap stuff first! I'm just mentioning I'm a little skeptical that will cure this particular problem. If it even is a problem, it sounds like it corrected itself and might never recur. Link to comment Share on other sites More sharing options...
Doug G. Posted November 3, 2014 Report Share Posted November 3, 2014 The CTLS has two pitots and two oat sensors, so a differential reading could be caused by a number of things. Link to comment Share on other sites More sharing options...
FlyingMonkey Posted November 3, 2014 Report Share Posted November 3, 2014 The CTLS has two pitots and two oat sensors, so a differential reading could be caused by a number of things. Well there ya go...that makes a pitot line issue much more likely. I drive a CTSW, I had no idea the LS has dual pitots. Link to comment Share on other sites More sharing options...
Anticept Posted November 3, 2014 Report Share Posted November 3, 2014 The CTLS has two pitots and two oat sensors, so a differential reading could be caused by a number of things. Newer models have two (skyview required). Mine has one. Link to comment Share on other sites More sharing options...
FlyingMonkey Posted November 3, 2014 Report Share Posted November 3, 2014 Newer models have two (skyview required). Mine has one. Meaning dual Skyviews require dual pitot? I know of a CTSW fitted with dual Skyviews that only has a single pitot. Link to comment Share on other sites More sharing options...
Anticept Posted November 3, 2014 Report Share Posted November 3, 2014 Meaning dual Skyviews require dual pitot? I know of a CTSW fitted with dual Skyviews that only has a single pitot. Other way around. Skyview required FOR dual pitot tubes. Redundancy feature that skyview has, but you don't have to have two pitot. Link to comment Share on other sites More sharing options...
WmInce Posted November 3, 2014 Report Share Posted November 3, 2014 Other way around. Skyview required FOR dual pitot tubes. Reduncancy feature that skyview has, but you don't have to have two pitot. Correct. Link to comment Share on other sites More sharing options...
FlyingMonkey Posted November 3, 2014 Report Share Posted November 3, 2014 Other way around. Skyview required FOR dual pitot tubes. Redundancy feature that skyview has, but you don't have to have two pitot. Ah, I understand. So the only CTs you will see with dual pitot tubes will also have Skyview systems. Link to comment Share on other sites More sharing options...
Doug G. Posted November 3, 2014 Report Share Posted November 3, 2014 Did not know that it was only on the skyview systems. Thanks Link to comment Share on other sites More sharing options...
Anticept Posted November 3, 2014 Report Share Posted November 3, 2014 You can also have more than one pitot system if you have multiple sensors to plumb to. For example, many of the older CTLS have a backup round gauge, and if I wanted, I could plumb that from a separate source with all the approvals etc. Link to comment Share on other sites More sharing options...
Tom Baker Posted November 4, 2014 Report Share Posted November 4, 2014 It is only on the dual 10" Skyview upgrade with dual AHARS. The base CTLS has dual 7" Skyviews with single AHARS, and 1pitot tube. Link to comment Share on other sites More sharing options...
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