IAS reading 21-22 mph while stationary on ground

[RobBritts]

I am currently 28 hours into my 40 hour Phase 1 of my Experimental SeaRey LSX. Today with assistance of my build assist partner we upgraded some chips in a gear alert system that is not connected to the Dynon but there is a small static pitot tube attached to the gear alert system.

The plane was then flown
it was immediately recognized that there was an issue with the IAS on both the Dynon and back up analog IAS. After a loop in the pattern the plane was examined and it was noticed that this small pitot tube was not properly connected.

After securing, as I started to taxi I realized the IAS on the vertical tape was reading 21-22mph. I attempted an engine and power shut down and restart and also covered the pitot static tube but the IAS still read 21-22mph.

i decided to try a quick loop in the pattern. Once airborne the manual and Dynon were within 2-3 mph of each other.

Should I perform a zero pressure collaboration test?

Any ideas are greatly appreciated.

Thanks
Rob

 

[jakej]

I am currently 28 hours into my 40 hour Phase 1 of my Experimental SeaRey LSX. Today with assistance of my build assist partner we upgraded some chips in a gear alert system that is not connected to the Dynon but there is a small static pitot tube attached to the gear alert system.

The plane was then flown
it was immediately recognized that there was an issue with the IAS on both the Dynon and back up analog IAS. After a loop in the pattern the plane was examined and it was noticed that this small pitot tube was not properly connected.

After securing, as I started to taxi I realized the IAS on the vertical tape was reading 21-22mph. I attempted an engine and power shut down and restart and also covered the pitot static tube but the IAS still read 21-22mph.

i decided to try a quick loop in the pattern. Once airborne the manual and Dynon were within 2-3 mph of each other.

Should I perform a zero pressure collaboration test?

Any ideas are greatly appreciated.

Thanks
Rob

yes, do the zero airspeed calibration however you should also check that there is no kinking of the tubing involved with the gear alert system.

 

[RobBritts]

yes, do the zero airspeed calibration however you should also check that there is no kinking of the tubing involved with the gear alert system.

Thank you so much I read the Dynon manuals and installation guides again and only saw reference to the pressure check.
I didn’t see any reference to a zero speed calibration test. Do you have reference I could review by chance? I’ll check the gear alert this morning.

 

[jakej]

page 5-22 of install manual vers AG gives reference to it.