X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Fri, 22 Jan 2010 17:08:55 -0500 Message-ID: X-Original-Return-Path: Received: from mta11.charter.net ([216.33.127.80] verified) by logan.com (CommuniGate Pro SMTP 5.3.1) with ESMTP id 4092471 for lml@lancaironline.net; Fri, 22 Jan 2010 16:15:29 -0500 Received-SPF: pass receiver=logan.com; client-ip=216.33.127.80; envelope-from=troneill@charter.net Received: from imp10 ([10.20.200.15]) by mta11.charter.net (InterMail vM.7.09.02.04 201-2219-117-106-20090629) with ESMTP id <20100122211453.FJYC8038.mta11.charter.net@imp10>; Fri, 22 Jan 2010 16:14:53 -0500 Received: from [192.168.1.100] ([75.132.241.174]) by imp10 with smtp.charter.net id YlEr1d0073mUFT705lEsJ5; Fri, 22 Jan 2010 16:14:53 -0500 X-Authority-Analysis: v=1.0 c=1 a=uJcuGXTG99oA:10 a=Ia-xEzejAAAA:8 a=CjxXgO3LAAAA:8 a=hOpmn2quAAAA:8 a=RJjCEQlu6K9wEBTfdxoA:9 a=yFqz4rj9cDhOdecRm80A:7 a=_4kqcBpAfWgMOGIGe34GT_CkcYcA:4 a=6e4CQMaF2vYA:10 a=EzXvWhQp4_cA:10 a=rC2wZJ5BpNYA:10 a=hUswqBWy9Q8A:10 a=GPmZNEkDCVxRZlFOTScA:9 a=EtC21n40M0rQClW1g_0A:7 a=iZLkjO45ELib6E2q5U2fPnKyu08A:4 Subject: Re: [LML] Re: Airspeed sensing switch needed Mime-Version: 1.0 (Apple Message framework v1077) Content-Type: multipart/alternative; boundary=Apple-Mail-1-272365093 From: Terrence O'Neill In-Reply-To: X-Original-Date: Fri, 22 Jan 2010 15:14:50 -0600 X-Original-Cc: Lancair Mailing List X-Original-Message-Id: <624BC19D-35AE-4B7F-808C-7F41DC614045@charter.net> References: X-Original-To: randy snarr X-Mailer: Apple Mail (2.1077) --Apple-Mail-1-272365093 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii Thanks for the info, Randy. I have my airspeed sensing switch set a 90 knots, in the gear-up = circuit, so that no matter where the gear switch is, it can't raise the = gear unless the airspeed is greater than 90 knots. Same on landing. I fi forget to put the gear switch to down, the gear = will come down anyway at 90 knots. The only downside (no pun intended) is that should I want to make a = gear-su forced landing, I couldn't... and have considered adding a = bypass into the circuit. Any thoughts on that/ Terrence=20 L235/320 N211AL >=20 > To: lml@lancaironline.net > Date: Thu, 21 Jan 2010 16:53:05 -0500 > From: randylsnarr@yahoo.com > Subject: [LML] Re: Airspeed sensing switch needed >=20 > 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... >=20 > Randy Snarr > N694RS > 235/320 >=20 > --- On Mon, 1/18/10, Terrence O'Neill wrote: >=20 > From: Terrence O'Neill > Subject: [LML] Re: Airspeed sensing switch needed > To: lml@lancaironline.net > Date: Monday, January 18, 2010, 6:43 AM >=20 > 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 >=20 > On Jan 16, 2010, at 7:28 AM, Bill Kennedy wrote: >=20 > 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? >=20 > 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. >=20 > Thanks -- Bill Kennedy > -- > For archives and unsub = http://mail.lancaironline.net:81/lists/lml/List.html >=20 >=20 >=20 --Apple-Mail-1-272365093 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=us-ascii Thanks for the info, Randy.
I have my airspeed = sensing switch set a 90 knots, in the gear-up circuit, so that no matter = where the gear switch is, it can't raise the gear unless the airspeed is = greater than 90 knots.
Same on landing.  I fi forget to = put the gear switch to down, the gear will come down anyway at 90 = knots.
The only downside (no pun intended) is that should I = want to make a gear-su forced landing, I couldn't... and have considered = adding a bypass into the circuit.
Any thoughts on = that/
Terrence 
L235/320 = N211AL



To: lml@lancaironline.net
Date: = Thu, 21 Jan 2010 16:53:05 -0500
From: randylsnarr@yahoo.com
Subject= : [LML] Re: Airspeed sensing switch needed

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><= span class=3D"Apple-converted-space"> wrote:

From: Terrence = O'Neill <troneill@charter.net>
Subje= ct: [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
=




= --Apple-Mail-1-272365093--