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  #1  
Old 04-02-2016, 08:23 AM
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Vlad Vlad is offline
 
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Default Pitot tube fitting delamination
Interesting phenomenon was discovered recently on stock stainless pitot tube. The anodized aluminum insert is delaminating. Wondering what's the cause? Vibration, galvanic corrosion or a defective part? Any advice on preventive maintenance?





If any builders have pitot tube not mounted could you please check if the fitting makes the bend? Or should I order new tube. The part was and still is working flawlessly for 2,500 hours. Was tightened once in Phase 1.
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  #2  
Old 04-02-2016, 09:11 AM
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LettersFromFlyoverCountry LettersFromFlyoverCountry is offline
 
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If by stock tube you mean the AL tube you make, the fitting won't make the bend. But why not just make up another tube?
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  #3  
Old 04-02-2016, 09:18 AM
David Paule David Paule is online now
 
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That looks like corrosion to me. I think if it is, it's intergranular corrosion of a form called exfoliation.

It looks like it's limited to the sleeve, but you'll need to make a new pitot tube just to get a new sleeve on there.

Dave
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  #4  
Old 04-02-2016, 09:19 AM
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Quote:
Originally Posted by LettersFromFlyoverCountry View Post
If by stock tube you mean the AL tube you make, the fitting won't make the bend. But why not just make up another tube?
It's stainless steel Bob and I don't have a piece in stock. The flaring tool is gone too.
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  #5  
Old 04-02-2016, 09:32 AM
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I'd be happy to make you an AL one and send it if you'd like.
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  #6  
Old 04-02-2016, 11:53 AM
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Van's sells a nice stainless replacement that comes with a pretty red cover. Under 20 bucks if I remember. I just replaced my fabricated alum. with stainless. Much nicer.
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  #7  
Old 04-02-2016, 12:26 PM
cajunwings cajunwings is offline
 
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Intergranular. If it's on the front side likely caused by salt particles collected when flying over salty water.

Don Broussard

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  #8  
Old 04-02-2016, 01:24 PM
Jimd Jimd is offline
 
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Probably just the photo but the nut looks bulged on the bottom to me. Have you taken it apart yet to see if there is more going on inside the nut?

Jim
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  #9  
Old 04-02-2016, 02:45 PM
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Quote:
Originally Posted by Vlad View Post
It's stainless steel Bob and I don't have a piece in stock. The flaring tool is gone too.

I have AL tubing and flaring tool up in SWF.....
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  #10  
Old 04-02-2016, 04:57 PM
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Quote:
Originally Posted by LettersFromFlyoverCountry View Post
I'd be happy to make you an AL one and send it if you'd like.
Bob thanks. I'll get a stainless one now I now how long it lasts.

Quote:
Originally Posted by cajunwings View Post
Intergranular. If it's on the front side likely caused by salt particles collected when flying over salty water.

Don Broussard

RV 9 Rebuild in Progress
Very might be Don. I have a fair share of flying low in salty mist.

Quote:
Originally Posted by Jimd View Post
Probably just the photo but the nut looks bulged on the bottom to me. Have you taken it apart yet to see if there is more going on inside the nut?

Jim

The nut is good Jim it's an optical illusion. No I didn't take it apart. I fly nearly every day and don't want to miss some fun because of stupid nut

Quote:
Originally Posted by kinger View Post
I have AL tubing and flaring tool up in SWF.....
Thanks James. I'll go stainless.
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