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Securing main tank drain valves

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Thomas.N.Gautier(at)jpl.n
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Posted: Mon Nov 26, 2007 10:05 am Post subject: Securing main tank drain valves

All,



      I'm coming, at last, to the end of the wings and I'm looking at

a final installation of the CAV-110 drain valve for the fuel tanks.

I ask myself "How do I make sure this little sucker never loosens

up and falls out in flight, leaving me high and dry?"



      Of course I always drain a bit from the tanks on the first flight

of the day and after refueling, etc., so you would think any problem

would easy to spot before real trouble. But, a tank draining in flight

is sort of catastrophic and any loosening with fuel drips, etc. that

you fix on the ground is, at best, annoying.



     So, what's the wisdom of the group? Jesse tells me to use fuel

lube and, presumably, then depend on the tapered pipe thread for

security. I thought I heard something about using some kind of

Loctite here. It's also easy enough to rivet a little tab on the skin

behind the drain valve and drill the valve hex for a safety wire.

Does anyone EVER have a problem with just tightening against

the tapered thread? Also, I'd like to hear what the pros like

John Cox think.



Regards,

Nick Gautier

#40363

end of the wings

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wvu(at)ameritel.net
Guest

Posted: Mon Nov 26, 2007 2:36 pm Post subject: Securing main tank drain valves

The only problem I ever had with the drain valves was that they were 

excessively tight, to the point that I could not move the valves to drain 

fuel from the tanks.  Try installing your first drain valve.  I think the 

number of threads and the torque required will give you a better feel that 

they won't be going anywhere soon.

Anh

N591VU-115hrs



---

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