X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Wed, 13 Nov 2013 09:04:01 -0500 Message-ID: X-Original-Return-Path: Received: from vms173021pub.verizon.net ([206.46.173.21] verified) by logan.com (CommuniGate Pro SMTP 6.0.7) with ESMTP id 6587722 for lml@lancaironline.net; Wed, 13 Nov 2013 08:53:27 -0500 Received-SPF: none receiver=logan.com; client-ip=206.46.173.21; envelope-from=Adam@ValidationPartners.com Received: from VpiWorkstation1 ([unknown] [69.124.233.79]) by vms173021.mailsrvcs.net (Sun Java(tm) System Messaging Server 7u2-7.02 32bit (built Apr 16 2009)) with ESMTPA id <0MW700I4HFW0QNC4@vms173021.mailsrvcs.net> for lml@lancaironline.net; Wed, 13 Nov 2013 07:52:53 -0600 (CST) From: "Adam Molny" X-Original-To: "'Paul Miller'" , References: Subject: RE: [LML] Re: N181AM nose gear collapse X-Original-Date: Wed, 13 Nov 2013 08:52:30 -0500 X-Original-Message-id: MIME-version: 1.0 Content-type: text/plain; charset=us-ascii Content-transfer-encoding: 7bit X-Mailer: Microsoft Office Outlook 11 Thread-index: Ac7gcL44Wtpars2cQB6ddyNy65KBHQABge+g In-reply-to: X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2900.6157 Paul - The gear relays are activated by applying a small current to the relay coil terminals. That pulls the main contacts closed against a strong spring. When you remove power the spring pulls the main contacts apart. There is a known failure mode where the main contacts weld themselves together. When that happens the relay will remain in the "on" state regardless of what the pressure switches are doing. -Adam -----Original Message----- From: Paul Miller [mailto:pjdmiller@gmail.com] Adam, I don't understand how this happens unless the pressure switches on the pump aren't shutting down. Paul