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                           AeroElectric-List Digest Archive
                                      ---
                     Total Messages Posted Sat 04/17/21: 2
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Today's Message Index:
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     1. 07:24 AM - Re: Plumbing Instruments  (Robert L. Nuckolls, III)
     2. 05:08 PM - Re: Plumbing Instruments  (Kelly McMullen)
 
 
 
________________________________  Message 1  _____________________________________


Time: 07:24:47 AM PST US
From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
Subject: Re: AeroElectric-List: Plumbing Instruments

At 11:26 AM 4/16/2021, you wrote:
>The restriction against Teflon tape applies to 
>oil and fuel hoses. It has no bearing on pitot 
>or static connections. There are tens of 
>thousands of amateur built and certified 
>aircraft flying around with Teflon tape on the 
>NPT ends of the fittings without consequence. 
>Note that the tape is only=C2 useful on the NPT 
>ends, there is no benefit to adding it to the compression end of the
 fittings.

   Cessna Service Manuals circa 1976 called out
   the use of teflon tape on the male fittings
   of the pitot-static plumbing. Modern
   nylon fittings are better fits and advertised
   to seal without the use of tape. In any
   case, a leak check is the controlling condition
   for system integrity.

   Applying tape such that the first two threads
   are left exposed goes to keeping shredded
   teflon from dropping into a system upon
   disassembly. But Nyloseal fittings with
   no tape seems to be the contemporary process
   of choice.


   Bob . . .

   Un impeachable logic: George Carlin asked, "If black boxes
   survive crashes, why don't they make the whole airplane
   out of that stuff?"

________________________________  Message 2  _____________________________________


Time: 05:08:19 PM PST US
Subject: Re: AeroElectric-List: Plumbing Instruments
From: Kelly McMullen <kellym@aviating.com>


The cleanest approach is the following kit:
https://www.steinair.com/product/pitot-static-tubing-port-kit/
Yes, a little pricey, but you can connect or disconnect the tubing in 
seconds, and as long as your cuts are clean and straight, no leaks.
Quality pipe threads rarely need tape or paste to seal. Cheap pipe 
fittings are all over the map for fit.

On 4/16/2021 10:29 AM, Robert L. Nuckolls, III wrote:
> At 11:26 AM 4/16/2021, you wrote:
>> The restriction against Teflon tape applies to oil and fuel hoses. It 
>> has no bearing on pitot or static connections. There are tens of 
>> thousands of amateur built and certified aircraft flying around with 
>> Teflon tape on the NPT ends of the fittings without consequence. Note 
>> that the tape is only useful on the NPT ends, there is no benefit to 
>> adding it to the compression end of the fittings.
> 
>   Cessna Service Manuals circa 1976 called out
>   the use of teflon tape on the male fittings
>   of the pitot-static plumbing. Modern
>   nylon fittings are better fits and advertised
>   to seal without the use of tape. In any
>   case, a leak check is the controlling condition
>   for system integrity.
> 
>   Applying tape such that the first two threads
>   are left exposed goes to keeping shredded
>   teflon from dropping into a system upon
>   disassembly. But Nyloseal fittings with
>   no tape seems to be the contemporary process
>   of choice.
> 
>   Bob . . .
> 
>   Un impeachable logic: George Carlin asked, "If black boxes
>   survive crashes, why don't they make the whole airplane
>   out of that stuff?"
> 


 

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