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  #1  
Old 04-09-2020, 04:11 AM
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JoopSJ JoopSJ is offline
 
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Default Loctite on AN fitting B nut

Is it good or bad practise to add blue loctite to the B nuts of AN fitting. considering the amount of vibration it seems like extra security to prevent the nut from loosening up.
Or is the standard tightning procedure sufficient to prevent this happening.
Thank you
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  #2  
Old 04-09-2020, 05:38 AM
noelf noelf is offline
 
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Bad idea. Don't do it.
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  #3  
Old 04-09-2020, 06:27 AM
PCHunt PCHunt is offline
 
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I don't think there is any mention of loctite, or any other thread locking compound in AC 43.13. Flare fittings have been around for a long time now, and loosening of them is not a known issue.

Failure to tighten properly, however, is a human issue.

The old WWII MS-series, the current AN-series, and the 37-degree industrial fittings don't require loctite.

Most flare failures are due to improper flare formation during tube construction, or improper torque during assembly. The usual torque mistake is OVERtorque, which results in cracking of the flare on the tube.

IMHO, no need for loctite, but learn how to form the flare properly (Lots of important details here), and don't overtorque when installing.

My Two Cents, YMMV.
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  #4  
Old 04-09-2020, 07:09 AM
Red Mtn flyer Red Mtn flyer is offline
 
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Default +1

What PC said. Simple joint but takes practice.
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  #5  
Old 04-09-2020, 07:57 AM
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9GT 9GT is offline
 
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They are assembled dry,,,no teflon tape either. Loctite hardens over time. You would not want a chunk of it break off and make its way to your engine.
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  #6  
Old 04-09-2020, 08:14 AM
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JoopSJ JoopSJ is offline
 
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OK, thanks all,
Yes, I am familiar with the AC.43.13 guidelines.
I will stick to that.
(Sometimes I tend to overthink or overdo things)
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  #7  
Old 04-09-2020, 08:34 AM
FinnFlyer FinnFlyer is offline
 
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No harm in questioning "best practices", especially if it leads to an understanding of why it's considered best, recommended or required practice.

Finn
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  #8  
Old 04-09-2020, 09:43 AM
TS Flightlines TS Flightlines is offline
 
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What has more vibration---your IO360 or a CAT bulldozer---careful with the answer. Think about it--
Enough said---
Tom
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  #9  
Old 04-09-2020, 10:04 AM
Ron B. Ron B. is offline
 
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Quote:
Originally Posted by TS Flightlines View Post
What has more vibration---your IO360 or a CAT bulldozer---careful with the answer. Think about it--
Enough said---
Tom
Tell you what , your butt knows the difference.
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  #10  
Old 04-09-2020, 11:50 AM
fixnflyguy fixnflyguy is offline
 
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Default Torque seal and forget

As your building, or re-building, a good practice is to apply torque seal which is a great visual inspection aid that will validate 2 things..one, that you have torqued it for final time, and second, it will visually let you know if it is loose, or has been loosened during inspection or maintenance. I torque seal mine at the B-nut and the ferrule /tube. I prefer bright orange, but lots of colors available. In fact, I do the same for every bolt on the plane.
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