X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Thu, 21 Jan 2010 16:53:05 -0500 Message-ID: X-Original-Return-Path: Received: from web111403.mail.gq1.yahoo.com ([67.195.15.144] verified) by logan.com (CommuniGate Pro SMTP 5.3.1) with SMTP id 4090781 for lml@lancaironline.net; Thu, 21 Jan 2010 12:16:05 -0500 Received-SPF: none receiver=logan.com; client-ip=67.195.15.144; envelope-from=randylsnarr@yahoo.com Received: (qmail 33543 invoked by uid 60001); 21 Jan 2010 17:15:29 -0000 DomainKey-Signature:a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com; h=Message-ID:X-YMail-OSG:Received:X-Mailer:Date:From:Subject:To:In-Reply-To:MIME-Version:Content-Type; b=5B8A53HvI61RifyZH3/tzy+rBf5Bl1GK1MYCD3ZWu+2QXbvY5+7R1x0+NWGt3MYnA/KolLTm9Io0l1cQofnhYRZSI4uvavqQjfMff4bHt1dbkJtOlBUGjz+cM89XxM1sYLfHQTGFoaSrracEC+Mbyyur4FXSf3okYlzs92nLu2M=; X-Original-Message-ID: <327821.32733.qm@web111403.mail.gq1.yahoo.com> X-YMail-OSG: K7ZylhIVM1lt8fyHX3O0gLrJ5BHMY8M2sM.PvKSMuKiDihvxrnZ9lqWd4CFvs7.ADfCC1t7MkdND0AQ4QgV4PYLzGYDeF_ltwWtOjjwxNAsY6gGjPnq0pD0fkxk5LCIxwV6CwcMVQqZAWXTVR_kmlVp_TUyN8Yisw6ZyOw_k.woHc7pWUBBqWnVxmN6kj1da6XPOB2xdJE9jpg4muaUxBgXNPIrAVy3RfeRiFzkQVSdooAJ8LrPOvd41KRp59MXh68LGxzHodcEc2ltj_PeGBJ5cBb2VIZQWwEPnAZ3qqkeERSLuWlwMBPtGKEGP1AnhlTq8hEEyPgWi_EEUxRfifSzgE8BzUiDAgl.RsuMT4RVx7rxnIpVhrh6Fi95YYCWciQ-- Received: from [76.8.220.18] by web111403.mail.gq1.yahoo.com via HTTP; Thu, 21 Jan 2010 09:15:29 PST X-Mailer: YahooMailClassic/9.1.10 YahooMailWebService/0.8.100.260964 X-Original-Date: Thu, 21 Jan 2010 09:15:29 -0800 (PST) From: randy snarr Subject: Re: [LML] Re: Airspeed sensing switch needed X-Original-To: Lancair Mailing List In-Reply-To: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="0-1828640860-1264094129=:32733" --0-1828640860-1264094129=:32733 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable Terrence, I have two sensing switches in my airplane. One used as a gear up warning f= or 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 s= crewdriver under the pilot side panel. The squat switch opens the gear up c= ircuit under 70 kts. I test it often on take off- I rotate and go gear up w= hile the AS is low and the gear wont=A0 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 f= ainted... dropped the switch and closed the dump valve and then sat and tho= ught 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 th= e plane on the ground while it was running. It is way too easy to do. I cer= tified 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 preve= ntion 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 wrote: From: Terrence O'Neill 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 circ= uit until a selected airspeed ... i.e. about 90 knots?TerrenceL235/320 N211= AL 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 Stua= rt in an earlier email. I thought Aircraft Spruce had a airspeed sensing sw= itch, 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 r= etractable time, but I've always been a little uneasy with no warning syste= m in my LNC2. I had hoped that I could talk Blue Mountain Avionics into bui= lding a warning system into their EFIS, but that didn't work out. Randy's s= ystem looks great to me and I'm eager to try it. I've attached Randy's draw= ing just in case others might want to revisit the idea. Thanks -- Bill Kennedy -- For archives and unsub=A0http://mail.lancaironline.net:81/lists/lml/List.ht= ml =0A=0A=0A --0-1828640860-1264094129=:32733 Content-Type: text/html; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable
Terrence,
I have two sensing switches in m= y airplane. One used as a gear up warning for landing like is being discuss= ed, the other is exactly what you described. Both are plumbed into the pito= t 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 o= ften 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 t= hese should be flying without a gear up squat switch of some kind. I am emb= arrased 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 positio= n 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 run= ning. 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 pre= vention against stupidity of which most of us on rare occasions are afflict= ed 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&g= t;
Subject: [LML] Re: Airspeed sensing switch needed
To: lml@lancairo= nline.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 t= hat 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 b= y Randy Stuart in an earlier email. I thought Aircraft Spruce had a airspee= d sensing switch, but I couldn't find it in their catalog. Can any of you help me fi= nd a source for the pressure switch?

I've never had a close call wit= h the gear in three plus thousand hours of retractable time, but I've alway= s 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 the= ir 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 w= ant to revisit the idea.

Thanks -- Bill Kennedy
<Gear Wa= rning 1.JPG>--
For archives and unsub http://mail.lancaironli= ne.net:81/lists/lml/List.html


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