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Bill,
You can find these at an appliance parts store. They are used to sense water level in the traditional washing machine. Their small, round with a small slip fitting for a hose and a few conductors that close when the pressure hits a specific point. I made a mount with an adjustment screw that can be accessed under the pilots panel with a screwdriver.
BTW, that is not my drawing but mine works very similarly. I used the inner gear door with a micro switch and ran that through the pressure switch that activates below 90 knots. I also just added a small buzzer that comes on with the dummy light. I too have never had a problem but an ounce of preventention.....
FWIW
Randy Snarr
--- On Sat, 1/16/10, Bill Kennedy <bill_kennedy_3@hotmail.com> wrote:
From: Bill Kennedy <bill_kennedy_3@hotmail.com>
Subject: [LML] Airspeed sensing switch needed
To: lml@lancaironline.net
Date: Saturday, January 16, 2010, 6:28 AM
I'm going to build the gear not down warning system suggested by Randy Stuart in an earlier email. I thought Aircraft Spruce had a airspeed sensing switch, but I couldn't find it in their catalog. Can any of you help me find a source for the pressure switch?
I've never had a close call with the gear in three plus thousand hours of retractable time, but I've always been a little uneasy with no warning system in my LNC2. I had hoped that I could talk Blue Mountain Avionics into building a warning system into their EFIS, but that didn't work out. Randy's system looks great to me and I'm eager to try it. I've attached Randy's drawing just in case others might want to revisit the idea.
Thanks -- Bill Kennedy
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