Return-Path: Sender: (Marvin Kaye) To: lml Date: Sat, 25 May 2002 09:52:06 -0400 Message-ID: X-Original-Return-Path: Received: from smtp03.mrf.mail.rcn.net ([207.172.4.62] verified) by logan.com (CommuniGate Pro SMTP 4.0b1) with ESMTP id 1247462 for lml@lancaironline.net; Fri, 24 May 2002 21:57:55 -0400 Received: from 216-164-237-242.s496.tnt3.frdb.va.dialup.rcn.com ([216.164.237.242] helo=OFFICE) by smtp03.mrf.mail.rcn.net with smtp (Exim 3.33 #10) id 17BQoY-0007M5-00 for lml@lancaironline.net; Fri, 24 May 2002 21:57:51 -0400 X-Original-Message-ID: <002d01c2038f$a89af750$f2eda4d8@OFFICE> From: "Bill & Sue" X-Original-To: "Lancair Mailing List" References: Subject: Re: [LML] Further to: Vacuum v. all electric X-Original-Date: Fri, 24 May 2002 21:58:25 -0400 MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2600.0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2600.0000 > Note to Bill Harrelson - I know you backed up the pump, in 12 years of > personal experience, I have had no pump failures, but 2 instrument failures. > BTW, I also run a cooling shroud on the pump body. Scott, good idea to keep the pump cool. I know that vacuum pumps fail. I know this because I keep reading it here on the list. I have been extremely lucky, however. In 25,000 hours, much of it in general aviation airplanes including many years as a flight school owner and examiner, I've never had a pump fail on a plane I was flying or on one that I owned in the flight school. This equates to something like zero failures in 100,000 hours. I have, however, had many alternator failures. Maybe the key to long pump life is to beat them up with rental/flight instruction use. I too have had a few gyro instrument failures, including some in airliners (electric, $50,000 units). Bill harrelson@erols.com N5ZQ