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Terrence,
I have two sensing switches in my airplane. One used as a gear up warning for landing like is being discussed, the other is exactly what you described. Both are plumbed into the pitot static system and are adjustable with a screwdriver under the pilot side panel. The squat switch opens the gear up circuit under 70 kts. I test it often on take off- I rotate and go gear up while the AS is low and the gear wont come up, when the AS hits 80 or so up they come. I don't think these should be flying without a gear up squat switch of some kind. I am embarrased to admit I have already inadvertently tested mine. Testing the gear on stands and used the dump valve to drop the gear and left the switch up. Started the plane a few days later and notice the switch in the up position while sitting idling on the ramp. I almost fainted... dropped the switch and
closed the dump valve and then sat and thought about it........Glad I had one installed. My friend Dick Mitchel was not so lucky. He raised the gear in front of the hanger and dropped the plane on the ground while it was running. It is way too easy to do. I certified crowd has that point right...
Both cost me nothing as my neighbor is in the appliance business. He had a shoe box filled with those and he gave me 2. They are a few ounces of prevention against stupidity of which most of us on rare occasions are afflicted by...
Randy Snarr
N694RS
235/320
--- On Mon, 1/18/10, Terrence O'Neill <troneill@charter.net> wrote:
From: Terrence O'Neill <troneill@charter.net>
Subject: [LML] Re: Airspeed sensing switch needed
To: lml@lancaironline.net
Date: Monday, January 18, 2010, 6:43 AM
Bill, Lurking because I share this interest. What are the pros and cons of a simple airspeed sensing switch that just interrupts the gear-up switch circuit until a selected airspeed ... i.e. about 90 knots? Terrence L235/320 N211AL On Jan 16, 2010, at 7:28 AM, Bill Kennedy wrote: 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 <Gear Warning 1.JPG>-- For archives and unsub http://mail.lancaironline.net:81/lists/lml/List.html
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