X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Mon, 08 Oct 2007 22:01:37 -0400 Message-ID: X-Original-Return-Path: Received: from smtp.perigee.net ([206.229.254.14] verified) by logan.com (CommuniGate Pro SMTP 5.1.12) with ESMTPS id 2376300 for lml@lancaironline.net; Mon, 08 Oct 2007 20:57:20 -0400 Received-SPF: none receiver=logan.com; client-ip=206.229.254.14; envelope-from=jschroeder@perigee.net Received: from john-study-2 (dsl-208-26-41-198.perigee.net [208.26.41.198]) by smtp.perigee.net (8.14.1/8.14.1) with ESMTP id l990ubwm024140 for ; Mon, 8 Oct 2007 20:56:38 -0400 X-Original-To: "Lancair Mailing List" Subject: Re: [LML] Re: Backup DG equivalent References: X-Original-Message-ID: X-Original-Date: Mon, 08 Oct 2007 20:56:33 -0400 From: "John Schroeder" Content-Type: text/plain; format=flowed; delsp=yes; charset=iso-8859-15 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit In-Reply-To: User-Agent: Opera M2/8.54 (Win32, build 7730) Tom - The DFC-250 Tru Trak autopilot has a magnetic backup of some sort because the airborne calibration procedure calls for calibrating it to the 4 major compass points. The 250 is the forerunner to the Sorcerer John On Mon, 08 Oct 2007 09:46:15 -0400, Tom Gourley wrote: > Mike, > > Which TruTrak autopilot do you have? I looked through the Sorcerer documentation and could find nothing on an internal magnetometer. I've also done a Sorcerer installation in a Legacy and don't recall anything about a magnetometer. TruTrak does have internal gyros. The Sorcerer operating manual states that if GPS data is lost the track function switches to bank; i.e. it uses its internal gyros to maintain bank. The autopilot function of the ADI Pilot also switches to a gyro backup mode if GPS data is lost. > > Tom Gourley > >