X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Sun, 07 Aug 2011 10:56:47 -0400 Message-ID: X-Original-Return-Path: Received: from vms173005pub.verizon.net ([206.46.173.5] verified) by logan.com (CommuniGate Pro SMTP 5.4.1) with ESMTP id 5083898 for lml@lancaironline.net; Sat, 06 Aug 2011 09:00:12 -0400 Received-SPF: pass receiver=logan.com; client-ip=206.46.173.5; envelope-from=n5zq@verizon.net Received: from p6520y ([unknown] [173.72.167.62]) by vms173005.mailsrvcs.net (Sun Java(tm) System Messaging Server 7u2-7.02 32bit (built Apr 16 2009)) with ESMTPA id <0LPI00INVC371LI6@vms173005.mailsrvcs.net> for lml@lancaironline.net; Sat, 06 Aug 2011 07:59:32 -0500 (CDT) X-Original-Message-id: From: "Bill Harrelson" X-Original-To: "Lancair Mailing List" References: In-reply-to: Subject: Re: [LML] Re: Fw: Re: Re-doing my panel - carefully thinking through failures X-Original-Date: Sat, 06 Aug 2011 08:59:30 -0400 MIME-version: 1.0 Content-type: multipart/alternative; boundary="----=_NextPart_000_0012_01CC5417.272AA930" X-Priority: 3 X-MSMail-priority: Normal Importance: Normal X-Mailer: Microsoft Windows Live Mail 15.4.3508.1109 X-MIMEOLE: Produced By Microsoft MimeOLE V15.4.3508.1109 This is a multi-part message in MIME format. ------=_NextPart_000_0012_01CC5417.272AA930 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Bill, My avionics switch is a DPST switch. Basically two switches in one. Each = side controls the power feed from one electrical system. Sure, both = sides of the switch could fail at the same time but that would be = unlikely. On top of that I have a separate, isolated switch that feeds = power only to the GPS/Com so that even if both sides of the avionics = switch should fail or both electrical system 1 and 2 fail, I can power = this unit from system 3. System 3 is an 8 amp B&C generator and an = Odyssey 545 battery. Bill Harrelson N5ZQ 320 1,950 hrs N6ZQ IV under construction Fred, Even with all the extra weight and redundancy, your avionics are all = reliant on a single switch. If that $7 switch goes, your plane is = blind, deaf, and dumb! The aeroelectric list does not recommend an = avionics buss. This is part of the reason for that. Bill B ------=_NextPart_000_0012_01CC5417.272AA930 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Bill,
 
My avionics switch is a DPST switch. Basically two = switches=20 in one. Each side controls the power feed from one electrical system. = Sure, both=20 sides of the switch could fail at the same time but that would be = unlikely. On=20 top of that I have a separate, isolated switch that feeds power only to = the=20 GPS/Com so that even if both sides of the avionics switch should fail or = both=20 electrical system 1 and 2 fail, I can power this unit from system 3. = System 3 is=20 an 8 amp B&C generator and an Odyssey 545 = battery.
 
Bill Harrelson
N5ZQ 320 1,950 hrs
N6ZQ  IV under = construction
 
 

Fred,

Even with = all the=20 extra weight and redundancy, your avionics are all reliant on a single = switch.  If that $7 switch goes, your plane is blind, deaf, and=20 dumb!  The aeroelectric list does not recommend an avionics = buss. =20 This is part of the reason for that.

Bill=20 = B

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