Jim Posted March 24, 2015 Report Share Posted March 24, 2015 Also posted on Dynon forums. D100 has 5.5 firmware, is networked with a D120 and is installed in a 2006 CTSW.Went flying yesterday evening. Everything was fine during the flight, no reason to question airspeed until I taxied back to the hangar. Instead of the airspeed indicator going blank as it normally does, it varied between 15-17 knots. I stopped the aircraft and it was still varying between 15-17 knots. I pressed the leftmost button to toggle the display screen and the airspeed field immediately went blank as it normally does. Back to top Link to comment Share on other sites More sharing options...
Roger Lee Posted March 24, 2015 Report Share Posted March 24, 2015 It may have been just a glitch and or it may just have needed to be rebooted like a regular computer at times. The other thing is to make sure the #2 yellow "Keep Alive wire" on the D120 has been disconnected or cut. It can cause strange things to happen. I just had a 2007 CT come in yesterday with this wire connected. Link to comment Share on other sites More sharing options...
Jim Posted March 24, 2015 Author Report Share Posted March 24, 2015 It may have been just a glitch and or it may just have needed to be rebooted like a regular computer at times. The other thing is to make sure the #2 yellow "Keep Alive wire" on the D120 has been disconnected or cut. It can cause strange things to happen. I just had a 2007 CT come in yesterday with this wire connected. I'll take a look. Both the D100 and D120 have worked flawlessly for the last 5 years. That's why I was a little surprised. I'm guessing it's a subtle firmware bug. Link to comment Share on other sites More sharing options...
Jim Posted March 25, 2015 Author Report Share Posted March 25, 2015 Went flying yesterday evening. Problem is still there and probably not firmware. We will blow out the static and pitot tubes this weekend and I have a feeling the problem will go away. Link to comment Share on other sites More sharing options...
FlyingMonkey Posted March 25, 2015 Report Share Posted March 25, 2015 Went flying yesterday evening. Problem is still there and probably not firmware. We will blow out the static and pitot tubes this weekend and I have a feeling the problem will go away. Disconnect them from your instruments first to avoid damage! Link to comment Share on other sites More sharing options...
FastEddieB Posted March 25, 2015 Report Share Posted March 25, 2015 Went flying yesterday evening. Problem is still there and probably not firmware. We will blow out the static and pitot tubes this weekend and I have a feeling the problem will go away. That would have been my first inclination. Simple stuff first. Link to comment Share on other sites More sharing options...
Jim Posted March 25, 2015 Author Report Share Posted March 25, 2015 Disconnect them from your instruments first to avoid damage! Absolutely. Link to comment Share on other sites More sharing options...
cdarza Posted November 23, 2015 Report Share Posted November 23, 2015 Any ideas to trouble shooting this one : I get a error indicated airspeed only in climb (increased angle of attack) Straight an level is fine. But when i climb, obviously i lose airspeed, however my indicated is showing a 15kt- 20kt difference to GPS (in no wind) - i.e Climb would be 50kts and GPS is showing 70kts. I tried checking stall and i am stalling at 60kts indicted - which i know is really around 40kts. Link to comment Share on other sites More sharing options...
FlyingMonkey Posted November 23, 2015 Report Share Posted November 23, 2015 Check your static port for possible partial blockage, and check all pitot connections for leaks. Link to comment Share on other sites More sharing options...
gbigs Posted November 23, 2015 Report Share Posted November 23, 2015 Any ideas to trouble shooting this one : I get a error indicated airspeed only in climb (increased angle of attack) Straight an level is fine. But when i climb, obviously i lose airspeed, however my indicated is showing a 15kt- 20kt difference to GPS (in no wind) - i.e Climb would be 50kts and GPS is showing 70kts. I tried checking stall and i am stalling at 60kts indicted - which i know is really around 40kts. If the pitot probe and pitot drain are blocked but the static port is free then the IAS will increase during a steady climb and decrease during a steady descent. Link to comment Share on other sites More sharing options...
Jim Posted April 10, 2016 Author Report Share Posted April 10, 2016 Sorry for the late followup. I disconnected the ports from the instruments and blew the ports and lines out with air. Everything started working fine again. Link to comment Share on other sites More sharing options...
FlyingMonkey Posted April 10, 2016 Report Share Posted April 10, 2016 Great! Link to comment Share on other sites More sharing options...
Fly Boss Posted May 8, 2016 Report Share Posted May 8, 2016 If the pitot probe and pitot drain are blocked but the static port is free then the IAS will increase during a steady climb and decrease during a steady descent. Where exactly would the pitot drain be located on an early model CTLS? Link to comment Share on other sites More sharing options...
gbigs Posted May 8, 2016 Report Share Posted May 8, 2016 Where exactly would the pitot drain be located on an early model CTLS? From the POH for the CT: Link to comment Share on other sites More sharing options...
Anticept Posted May 8, 2016 Report Share Posted May 8, 2016 Where exactly would the pitot drain be located on an early model CTLS? They don't have one. The system has to be blown out. Link to comment Share on other sites More sharing options...
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