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09-04-2023, 06:12 PM
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Join Date: Aug 2021
Location: Sharpsburg, GA
Posts: 17
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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
N1022Y
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09-04-2023, 06:21 PM
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Join Date: Sep 2016
Location: NE Ohio
Posts: 259
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Can you use a ziptie on it??
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09-04-2023, 07:52 PM
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Join Date: Jul 2007
Location: DuBois,Il
Posts: 225
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Good Idea
Quote:
Originally Posted by MIKE JG
Can you use a ziptie on it??
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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
DuBois,Il
N433BC "Muttley" RV-7A Flying
N433BM "Dastardly" RV-12is EMP, FUSE, WINGS, POWERPLANT Done...FINISH and AVIONICS in PROGRESS
Official Repeat Offender
"Maintain thy airspeed...Lest the earth arise and smite thee..."
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09-05-2023, 12:16 AM
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Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 10,339
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Based on my experience with RV-12’s 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, A&P, EAA Technical Councelor
RV-6A (aka "Junkyard Special ")
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09-05-2023, 09:00 AM
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Join Date: Nov 2013
Location: Austin
Posts: 58
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Spring latches for D-subs
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09-05-2023, 10:39 AM
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Join Date: Jul 2012
Location: Winfield Park, NJ
Posts: 489
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I've never had one vibrate loose.. and in nearly all cases, I have to fight with it to get it to unscrew
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Rob Carsey, Winfield Park, NJ
RV-12iS (N713) / Completed 12/2020 / 510hrs and counting
ASEL, Glider, AGI/IGI, LSRM-I, FCC GROL
APRS Track or ADSBExchange Track
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