Mailing List lml@lancaironline.net Message #45800
From: Robert Pastusek <rpastusek@htii.com>
Sender: <marv@lancaironline.net>
Subject: RE: [LML] Re: Single Point Failures
Date: Mon, 14 Jan 2008 12:46:58 -0500
To: <lml@lancaironline.net>

"There is no fool proof device.  Fools are so ingenious." Anom

 

Yep, I certainly agree with those bottom lines.  After all, almost all of us still operate with only one (1) pitot tube. What good is my AOA device and two airspeed indicators if they use the same reference source? 

 

Scott

 

Scott,

I was faced with the same problem when I elected to add a Dynon D-10A to my panel fairly late in construction of my IV-P. Hooking it to the same power, pitot and static ports seemed  a bad way to configure a secondary system, so I installed a separate pitot and static source for it. The new light weight tubing and nylon fittings seem ideal for this application. As the plane was already painted, I installed the Dynon’s straight pitot/AOA tube through a hole in the leading edge of my right winglet with minimal damage to the already-painted winglet. Worked well, but I do have a pitot tube sticking out of the right winglet that seems ideally placed to catch you in the chest during walk around. At least the flag on it is pretty visible. J

The Dynon is installed on the right side of the panel, along with a Garmin 496, giving me an “internally battery powered” ability to fly and navigate with loss of all electrical systems. I did compromise and connect an aircraft power feed to these instruments for “normal” use by my flying partner. I also “discovered” during testing that all battery/alternator/power controls for the airplane pass through a single cannon plug on the firewall—a design error that was easily avoided by better planning, but has been a b---- to correct after the engine was installed and the firewall wiring closed out. However, after seeing the results of the cannon plug being accidentally disconnected during testing, I felt this was such a critical error that I went back and re-wired to provide separate paths for the independent electrical systems. …just something to think about.

Your first line above applies to me…in spades!

Bob

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