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  #11  
Old 06-03-2010, 02:25 PM
Bavafa Bavafa is offline
 
Join Date: Oct 2007
Location: Sacramento, CA
Posts: 3,490
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Do you punch the screw or the housing? I have the Andair valve and don't recall the instructions but it is possible that I have just missed it. Looking at their site and the pic of the valves, it seems they have punched the housing.
And there is no on-line manual on their site any thing in this regard.

Any additional info would greatly be appreciate it.
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  #12  
Old 06-03-2010, 03:05 PM
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SmittysRV SmittysRV is offline
 
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Quote:
The Andair fuel selector valve is the same. I had done the punch through the edge, as mentioned in the last post, then decided to switch the orientation of the connector. It took me a long time to drill out the screws. Punching out a spot on he side of the screw works very well.
I didn't do anything my fuel selector valve either. Was I supposed to? I not sure I know what "punch through the edge" means.
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  #13  
Old 06-03-2010, 03:53 PM
danbenua danbenua is offline
 
Join Date: Oct 2007
Location: Hillsboro, OR
Posts: 84
Default Andair installation

The procedure for "punching" the screw heads is also called
"staking". Andair fittings have a tiny notch that aligns with
the edge of the screws that attach those fittings to the valve
body. The idea is to hit the screw head with a center-punch
so that a little bit of metal is displaced into the notch on the
fitting. Done properly, this action prevents the screws from
backing out under vibration. Hopefully someone can post
a photo to clarify.

It is essential to follow this procedure when installing an
Andair valve or gascolator. This is one more example where
failure to carefully read the instructions that come with
flight-critical components can have severe consequences.

Heads-up to technical counselors! This is one very subtle
builder error to watch out for!

- Dan Benua
Repeat Offender & Technical Counselor
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  #14  
Old 06-03-2010, 04:13 PM
Bavafa Bavafa is offline
 
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Location: Sacramento, CA
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Thanks Dan for the info, makes sense and I will be checking mine. I just hope I won't have to remove the valve in order to punch it. Will see how much room I got to do this safely.
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  #15  
Old 06-03-2010, 04:42 PM
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SmittysRV SmittysRV is offline
 
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Here's a pic of one of their selectors. You can see the notches. Can I use my spring loaded punch to do this?

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  #16  
Old 06-03-2010, 05:09 PM
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BSwayze BSwayze is offline
 
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Location: Molalla, Oregon
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Yes, thanks Dan! And thank you, Jerry for posting this thread.

As you know, Dan, I also have the Andair fuel selector valve and I don't recall seeing anything like this in the instructions. So I just went out in the shop and grabbed all the materials that came with the valve. There's nothing in the little instruction booklet. There's a big red tag that warns you not to operate the valve dry, but nothing about this. Then I saw a small label stuck on the little ziplock bag that contained the allen wrenches and screws. In small print it says "Ensure the heads of the screws are staged into the small holes with a punch on instillation." (their spelling; not mine)

I had completely missed this. It would have been so easy to toss this little ziplock bag in the trash. I'm one of those that hangs onto everything. If I had read it, I wouldn't have known what the word "staged" meant. I, too, would appreciate some elaboration or pictures about the method used, and how it's supposed to look.

I would also hope that Andair is seeing this thread. I would recommend they devote more attention to this in their instructions, explain how it's done in more detail, and maybe include a snapshot or drawing.
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  #17  
Old 06-03-2010, 06:12 PM
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beav beav is offline
 
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Location: San Jose, CA
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Here's a picture from my site where I did this:

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  #18  
Old 06-03-2010, 06:36 PM
KirkGrovesRV8 KirkGrovesRV8 is offline
 
Join Date: Jan 2005
Location: Paradise,Pa S37
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I am gonna double check my fuel selector when I go to the hangar again
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  #19  
Old 06-03-2010, 09:36 PM
jerryab jerryab is offline
 
Join Date: Dec 2008
Location: Northwest Arkansas
Posts: 40
Default Thanks to everyone that has read this thread!

Thank all of you for your input, this truly is a critical issue for those of us that have these Andair Parts. I had just returned from a 5 hour xcountry when this was discovered. With 3 fatal accidents in RV's this weekend, I sure hope we all learn and pass it along. Thanks to DR for providing this forum. There were two people this week that got hit locally with a prop, both lived, but badly injured, Be careful out there! Airplanes are like Rattlesnakes, great animals but you had better know them very well if you are around them and respect their ability to strike at any moment with a lethal result!!
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  #20  
Old 06-04-2010, 11:05 AM
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swisseagle swisseagle is offline
 
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Location: 20km outside of Zurich, Switzerland
Posts: 495
Default Address needet?

Hello Jerry

Due to Andy is not member of this forum, I let him know your story, here is his answer:

Hi Dominik,

Thanks for the link, It is difficult to offer a complete answer to this problem we have never had this occur before but there is always a first time, there must be in access of 10000 gascolators out there looking at our records.

I'm not on the VAF web site but if you could send him a note saying if he e-mail's his address to me I'll send him some screws.

On the gascolators we send out with male, hose and banjo fittings they are stagged (punched in the little holes) but the female fittings are sent with a screw pack and Allen key. We cannot send out any valve or gascolator using threadloc there is no external evidence that it has been secured.

Regards, Dominik
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