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Old 07-04-2018, 06:36 PM
snoopyflys's Avatar
snoopyflys snoopyflys is offline
Join Date: Oct 2007
Location: Katy, TX
Posts: 134
Default Looking for Advice on Running the Pitot and AOA Lines from Panel

Hi All,

Looking for advice on how to run my SafeAir Pitot and AOA lines from the instrument panel to the left wing. I have searched and found some posts but none with pics (or the pics have been removed/blocked). Solution I have now, but not implemented, is to run both lines along the left longeron to the channel created by the F-704K Upright Cap down to the W-704-L Front Wing Spare Assembly and F-704 Center Section Assembly. While I have not mount the wings for the last time and before I start poking holes in the center section, I would like to know if my selected routing position will have enough clearance for the Pitot and AOA lines between the Upright cap, Wing Spare Assembly bar and the F-740-L Front Seat Floor pan? Itís not clear in the drawings if there will be enough clearance or not so looking for confirmation or suggestions for routing these lines.

(Sorry for the link below, but I am somewhat challenged getting images to insert)

Dan Schultz
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Slow Building - 7A Tipper
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Old 07-06-2018, 02:26 PM
RV7 To Go RV7 To Go is offline
Join Date: May 2011
Location: Ontario, Canada
Posts: 130

Yours appears to be an A model. Mine is not so I am not sure if it is the same.

I ran mine down through the centre tunnel, under the fuel valve, along the front of the main spar adjacent to the fuel line, through the spar web using the predrilled holes, out to the wing after drilling a hole in the fuse where needed and using a snap bushing.

Hope the description makes sense as I don't have any pics.

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Old 07-06-2018, 03:08 PM
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Raymo Raymo is offline
Join Date: Nov 2014
Location: Richmond Hill, GA (KLHW)
Posts: 1,875

Your proposed solution would likely require sharp bend in the tubing to get through the forward spar.

Depending on your wiring plans, there should be ample room in the specified spar pass-through snap bushings. Vans has also approved additional pass-through holes, as long as they are placed in the correct location in the spar.

If you will have an all glass panel (no steam gauges), there is no need to route them to the panel. You'd likely mount AHRS boxes in the fuselage and route them to the back, instead.
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Old 07-06-2018, 06:20 PM
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mfleming mfleming is offline
Join Date: Sep 2016
Location: Joseph, Oregon
Posts: 327

Originally Posted by Raymo View Post
.................If you will have an all glass panel (no steam gauges), there is no need to route them to the panel. You'd likely mount AHRS boxes in the fuselage and route them to the back, instead.
Unless your installing a Garmin GSU-25 AHRS module, then that mounts behind the EFIS. (at least that's what SteinAir is telling me)
Michael Fleming
Joseph, OR
sagriver at icloud dot com

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Started 11/2016
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Old 07-06-2018, 09:24 PM
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sahrens sahrens is offline
Join Date: Jan 2007
Location: Northern CA
Posts: 411

Dan -

I believe there is insufficient room for the routing you are describing.

Here is an alternative routing you might consider. Continue the run along the longeron past 704 center section to the 705 bulkhead, then down through the arm rest into the compartment formed by the seat pan, lower skin and left side skin. Once under the seat pan you can penetrate the skin to connect with the wing pitot/static lines

Provides your lines with protection for most of the run.
Keeps the pitot/static lines away from the flight controls and any wiring runs you have in that area.

Longer runs
Routing around the tipper locking mechanism may be interesting.
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Old 07-06-2018, 10:05 PM
BillL BillL is offline
Join Date: Sep 2007
Location: Central IL
Posts: 4,727

I have a 7 so probably different in some ways. I ran the static line under the left longeron, but the routings of the AOA and pitot was right down the middle, through extra holes in the spar (approved drawing available) then entered the wing aft of the spar so it did not have to go through the fuel tank. A little practice will have you heating and bending that tubing like a pro. Otherwise, it is really hard to make the tight bends necessary. I ran mine near the spar in the wing - bad idea, run them well aft and line up the holes in the wing rib - that way they can be installed in one piece after the wing is bolted on.

While you are at it, be sure to fill the opening on the forward part of the spar, lest it blow frosty air on you in the winter.

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Old 07-06-2018, 10:14 PM
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Dbro172 Dbro172 is offline
Join Date: Apr 2012
Location: West Fargo, ND
Posts: 1,045

What you are suggesting is what I did, if I recall correctly, and it worked fine. Remember, instead of bending the tubing, you can also add 90 degree safe air quick disconnect fittings. I used some near the spar, to change direction and head out into the left wing. 4 years and two pitot static inspections passed with flying colors.
Derek Hoeschen
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