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10-25-2015, 11:32 AM
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Join Date: Jul 2009
Location: Coeur d'Alene, ID/Casa Grande, AZ
Posts: 654
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Quote:
Originally Posted by BigJohn
Hopefully this will correct your bad readings, but I have lingering doubts. Ever since your original post I've been wondering about your theory that plugged static ports are causing HIGH airspeed readings. Normally, plugged static causes LOW airspeed indications. When you flew how were the altitude readings? If the static line was plugged the altimeter would not have read correcly. Considering that mistakes were made such as not removing the mandrels and painting over the holes, I would be concerned about other areas of construction as well.
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I would confirm that the static/pito lines are connected to the correct ports on the Adahrs.
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Ric Dickison
307 (CAB) Phantom
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10-25-2015, 01:53 PM
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Join Date: Jan 2011
Location: Barneveld, NY
Posts: 189
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Curious if the plane ever had an initial or subsequent 24 month pitot static check?
I met at least one RV-12 builder who had signed this off himself, rather than having a test with a properly calibrated test set by a repair station.
Carl
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Private Pilot
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10-25-2015, 06:17 PM
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Join Date: Apr 2008
Location: Riley TWP MI
Posts: 3,070
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Corrected my typo (pointed out by Scott) in post 6 above.
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Joe Gores
RV-12 Flying
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10-27-2015, 09:16 AM
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Join Date: Oct 2012
Posts: 421
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Quote:
Originally Posted by newamiga
Curious if the plane ever had an initial or subsequent 24 month pitot static check?
I met at least one RV-12 builder who had signed this off himself, rather than having a test with a properly calibrated test set by a repair station.
Carl
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I don't think you need to have this done for a VFR only RV-12....which most are except those few putting in the waas or a NAV.....
"§91.411 Altimeter system and altitude reporting equipment tests and inspections.
(a) No person may operate an airplane, or helicopter, in controlled airspace under IFR unless—"
....what am I missing?
You do need to do the transponder check (make sure you change the settings from "auto" in Skyview), and every once and a while I'll ask ATC for an altitude and airspeed check....feel good self-calibration.
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10-27-2015, 12:08 PM
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Join Date: May 2008
Location: Friday Harbor, Wa
Posts: 300
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Check out 91.413, thats the one you need to address for VFR
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MRT890
120042 RV-12
N112XP
Last edited by mrt890 : 10-27-2015 at 12:10 PM.
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10-27-2015, 12:25 PM
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Join Date: Oct 2012
Posts: 421
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Quote:
Originally Posted by mrt890
Check out 91.413, thats the one you need to address for VFR
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Right - 24 month transponder only - is that what you are saying?
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10-27-2015, 12:52 PM
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Join Date: May 2008
Location: Friday Harbor, Wa
Posts: 300
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__________________
MRT890
120042 RV-12
N112XP
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10-28-2015, 06:29 AM
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Join Date: Nov 2008
Location: Gloversville, NY
Posts: 1,587
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To get back to the original topic........
....... were you able to get to the bottom of the airspeed issue? Did clening out the static ports make a difference?
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John Peck, CFII, A&P, EAA Tech Counselor, Flight Advisor.
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VAF paid through 10/2019.
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10-30-2015, 03:52 AM
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Join Date: Nov 2014
Location: Hinckley, Ohio
Posts: 2,066
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I opened the static ports and still did not fix high IAS readings. D-180 is currently sent to Dynon for repair. Dynon says airspeed transducer failed.
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11-14-2015, 05:23 PM
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Join Date: Nov 2014
Location: Hinckley, Ohio
Posts: 2,066
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Still have very high IAS...
Synopsis from my posts above?. I bought a flying RV-12 with Dynon D180. I have units set for statute (fpm, mph). The airspeed indicator consistently shows IAS as 60 mph too high. In level cruise flight I show 180mph and I?m indicating about 125 mph on final approach. In addition, the White Arc for Vfe is set at 150 mph. I did some troubleshooting and found the original builder forgot to open the static port rivets on each side of the fuselage. I drilled this out and verified the ports were open and connected to the static tubing. This didn?t make any difference and IAS reading sere still in the range of 60 mph too high. I have set zero pressure value and this too didn?t make any difference.
Recent information? Three weeks ago I sent the D180 unit to Dynon telling them IAS was reading ~ 60 mph too high. Dynon replaced the airspeed sensor and returned the unit to me. I installed the unit today and still have IAS reading 60 mph too high.
So here?s my thoughts?
1) Perhaps Dynon didn?t repair and completely check out the unit and returned it to me with same problem, or maybe a scaling factor is wrong in the software.
2) Maybe somehow I?m getting over-pressurization in the pitot line. Maybe a hole in the tubing where it runs inside the engine cowl. The cowling most likely is at higher pressure.
3) Maybe too much vacuum created in the static line. I could disconnect the static line from the back of the D-180 for a test.
4) Maybe having Vfe white arc set at 150 mph is causing some interaction. Tomorrow I will configure airspeed color thresholds per D180 Installation Guide and RV-12 POH.
If anyone has any ideas on how to troubleshoot this problem I?d appreciate hearing.
Piper J3
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