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Old 03-21-2022, 05:27 PM
Piper J3's Avatar
Piper J3 Piper J3 is offline
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Location: Hinckley, Ohio
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Default Question About Pitot / Static Testing for Transponder Certification

I'm helping a friend with his RV-12 Annual Condition Inspection. The Transponder will need re-certification when we are finished. The plane has dual Dynon HDX and Angle of Attack. Pitot, Static and AOA all connect to the ADHRS behind the baggage bulkhead. My question… when performing the pitot / static leakage test, does the AOA need to be blocked off? Would there be a significant leak if the AOA was left open?
Jim Stricker - EAA #499867
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Old 03-21-2022, 05:49 PM
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Walt Walt is offline
Join Date: Aug 2005
Location: Dallas/Ft Worth, TX
Posts: 6,716

A static leak check is done independently of pitot or AOA.
None of the systems are interconnected.
PS: there is no requirement to do the P-S system to just check the transponder.
Walt Aronow, DFW, TX (52F)

EXP Aircraft Services LLC
Specializing in RV Condition Inspections, Maintenance, Avionics Upgrades
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Last edited by Walt : 03-21-2022 at 05:52 PM.
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Old 03-21-2022, 06:23 PM
Bob Y Bob Y is offline
Join Date: Jul 2017
Location: Piedmont, SC
Posts: 385

Here’s the KAI section showing the Dynon ADAHRS. You can see that the AOA, pitot and static lines are all independent of each other, so no cross venting. And I have never been able to get a good enough seal on my AOA port to perform a leak test of that line.
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Bob Y - builder 12iS E-LSA
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Old 03-21-2022, 07:55 PM
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Tony Kirk Tony Kirk is offline
Join Date: Apr 2005
Location: KDUH
Posts: 111

Also, be aware that Dynon wants you to use the Pitot/Static test mode when testing the P/S system so you don't mess up the ADAHRS calibration.

A lot of people don't read deep enough into the Installation Manual to find information like this.
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Opinions, information and comments are my own unless stated otherwise.
They do not necessarily represent the direction/opinions of my employer.

Tony Kirk
Van's Aircraft Tech Support (working from home)
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Old 04-20-2022, 07:26 PM
dbenoit dbenoit is offline
Join Date: Nov 2021
Location: CALLAHAN
Posts: 9


Thanks for the advice. I need to have mine tested next week. The only avionics shop are is a Garmin dealer and has a disdain for Dynon. I love my HDX! Will make sure that they are aware prior to commencing the test.
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Old 04-20-2022, 08:48 PM
RV8JD RV8JD is offline
Join Date: Jan 2005
Posts: 462

Also, the Dynon Transponder checks require manual switching to ALT and GND mode.

Carl N.
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Old 04-20-2022, 10:40 PM
RFSchaller RFSchaller is offline
Join Date: Oct 2010
Location: Phoenix, AZ
Posts: 3,296

For a VFR check there is no need to simulate altitudes with a pressure/vacuum source. Does he really need an IFR cert?
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