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Old 09-04-2023, 07:12 PM
HEB1022 HEB1022 is offline
Join Date: Aug 2021
Location: Sharpsburg, GA
Posts: 18
Default Transponder connection vibrated loose

I was flying today, and my Transponder (Dynon) went offline. When I got on the ground, I found that the 25 pin d-sub connector "XPDNR" had come disconnected (42CIS/U-02-Step 9). I reinserted the connector and snugged the screwed on the 25 pin, but concerned it might vibrate loose again. It is mounted on the inside of the firewall, and probably picking up vibratoins from the engine mounts. The airplane has about 90 hours on it. Should I apply any loctite or is there a better method to prevent this from coming loose?

Thanks in Advance,

Harry Burnette
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Old 09-04-2023, 07:21 PM
MIKE JG MIKE JG is offline
Join Date: Sep 2016
Location: NE Ohio
Posts: 267

Can you use a ziptie on it??
-Mike G
Northeast Ohio
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Old 09-04-2023, 08:52 PM
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bkc3921 bkc3921 is online now
Join Date: Jul 2007
Location: DuBois,Il
Posts: 225
Default Good Idea

Originally Posted by MIKE JG View Post
Can you use a ziptie on it??
I'm in the process of installing my avionics kit..I'm not even done yet, and with 2 different connectors, one of the long connection screws will seat properly, and the other feel like it is "stripped" and will not tighten up. I've done nothing to abuse the connectors..frankly, I'm just not sure the connectors are of the highest quality... (what is these days..?) . The plastic seems a little "cheap" to me, but I don't know why they won't tighten...

Anyway, I have decided to secure every connector with a ziptie if possible...but I am a little afraid of locktite in this application. Maybe I'm just afraid I will never get it loose, or the screw will break inside one of those 25/37 pin connectors and create an "expensive to fix" problem. Perhaps Stein would have some advice.
Brian K. Morrow
N433BC "Muttley" RV-7A Flying
Official Repeat Offender
"Maintain thy airspeed...Lest the earth arise and smite thee..."
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Old 09-05-2023, 01:16 AM
rvbuilder2002 rvbuilder2002 is offline
Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 10,463

Based on my experience with RV-12ís and D-sub connectors in general, it would be my guess that it was never fully tightened or maybe not at all.
Opinions, information, and comments, are my own unless stated otherwise.
You are personally responsible for determining the suitability of any tips, ideas, etc. obtained from any post I have made in this forum.

Scott McDaniels
Hubbard, Oregon
Formerly of Van's Aircraft Engineering Prototype Shop
FAA/DAR & Pre-purchase inspection Services
A&P, EAA Technical Councelor
RV-6A (aka "Junkyard Special ")
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Old 09-05-2023, 10:00 AM
Bo1000 Bo1000 is offline
Join Date: Nov 2013
Location: Austin
Posts: 60
Default Spring latches for D-subs

If you want fast, easy and secure -
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Old 09-05-2023, 11:39 AM
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rcarsey rcarsey is offline
Join Date: Jul 2012
Location: Winfield Park, NJ
Posts: 504

I've never had one vibrate loose.. and in nearly all cases, I have to fight with it to get it to unscrew
Rob Carsey, Winfield Park, NJ
RV-12iS (N713) / Completed 12/2020 / 550hrs and counting
APRS Track or ADSBExchange Track
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