Fuselage Fuel Vent Line Arrangement

[tx_jayhawk]

I was attaching my fuselage fuel vent lines to the bottom and side bulkhead fittings, and I ran into a question that I've seen different approaches on.

Does the two 4D spacers "sandwich" the side skin, or do they both go on the inside of the skin to push the AN fitting more in-line with the vent line?

I have the spacers sandwiching the skin, and I've worried a little about how sharp of a bend occurs to get over the longeron and back connected to the AN fitting. It made me start to wonder if maybe both AN fittings should go on the inside. It is hard to tell from DWG 36A, section D-D.

Thanks,
Scott
7A Finishing

 

[Rick_A]

Both on the inside

Definitely both on the inside. Like you said, it helps a lot with clearance for the line and fitting.

 

[mburch]

Scott,

I put both spacers and an AN960-716 (I think) washer between the fitting and the side skin on the inside of the fuselage. The nut on the outside is directly against the side skin.

Click here for a photo of a practice piece that shows the spacers: http://www.rv7blog.com/images/20060709_tube2.jpg

mcb

 

[Jim Percy]

As another data point, I put one inside and one outside. Just seemed like a sturdier arrangement, but I think I'm in the minority. I don't recall having much difficulty clearing the longeron.

Jim Percy
N373JP