X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Wed, 07 Mar 2012 07:58:53 -0500 Message-ID: X-Original-Return-Path: Received: from [66.70.126.15] (HELO omta0112.mta.everyone.net) by logan.com (CommuniGate Pro SMTP 5.4.4) with ESMTP id 5431107 for lml@lancaironline.net; Tue, 06 Mar 2012 16:01:31 -0500 Received-SPF: none receiver=logan.com; client-ip=66.70.126.15; envelope-from=bknotts@buckeye-express.com Received: from sj1-dm103.mta.everyone.net (bigip-ext [172.16.0.1]) by omta0112.mta.everyone.net (Postfix) with ESMTP id CB4DE5A81C0 for ; Tue, 6 Mar 2012 13:00:55 -0800 (PST) X-Eon-Dm: sj1-dm103 Received: by sj1-dm103.mta.everyone.net (EON-AUTHRELAY2 - 48f07e90) id sj1-dm103.4f45c611.2bb4ff for ; Tue, 6 Mar 2012 13:00:55 -0800 X-Eon-Sig: AQK8DXBPVnsHSltGkQIAAAAB,5c3dd064e90e5f398ca636358024043c X-Originating-Ip: 72.240.126.144 X-Original-Message-ID: <4F567B0D.6070408@buckeye-express.com> X-Original-Date: Tue, 06 Mar 2012 16:01:01 -0500 From: "F. Barry Knotts" Reply-To: bknotts884@earthlink.net User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:10.0.2) Gecko/20120216 Thunderbird/10.0.2 MIME-Version: 1.0 X-Original-To: Lancair Mailing List Subject: Re: [LML] Field breakers popping References: In-Reply-To: Content-Type: multipart/alternative; boundary="------------080906050305070600020105" X-Antivirus: avast! (VPS 120306-0, 03/06/2012), Outbound message X-Antivirus-Status: Clean This is a multi-part message in MIME format. --------------080906050305070600020105 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Had similar issues with just the backup alternator system. I put a recording voltmeter on the circuit to try to diagnose. Found voltage spikes that tripped the regulator. Changed alternators, batteries, a lot of wiring and B&C regulators before I found the very slightly loose ground connection on the firewall. Hasn't been a problem since. Would recommend a thorough check of all ground connections on engine, alternators, batteries and into airframe before replacing other "parts." I am convinced that your problem is with a ground as that's probably the only common connection between the two charging systems. Barry Knotts L-IV P, N4XE On 3/5/2012 8:21 AM, Craig Gainza wrote: > Dear Listers, > > Recently, I completed my annual and test flew the airplane. Upon > lifting the gear both primary and secondary alternator field breakers > popped. Pushed them back in and all charging returned to normal on > the primary and secondary alternators. > > Landed, checked connections, put in a different battery, ran through B > and C voltage regulator troubleshooting guide (came out normal) and > did a ground run up. When lifting the flaps, hydraulic pump kicked on > both field breakers popped again. Right now I am assuming it is the > voltage regulator (both pri and sec are B and C), alternator , or a > connector. > > Anyone have similar issues and can recommend the next course of action? > > Thank you, > > Craig Gainza > IV-P TSIOF 550 > 782 hours and holding > > > --------------080906050305070600020105 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Had similar issues with just the backup alternator system. I put a recording voltmeter on the circuit to try to diagnose. Found voltage spikes that tripped the regulator. Changed alternators, batteries, a lot of wiring and B&C regulators before I found the very slightly loose ground connection on the firewall. Hasn't been a problem since. Would recommend a thorough check of all ground connections on engine, alternators, batteries and into airframe before replacing other "parts." I am convinced that your problem is with a ground as that's probably the only common connection between the two charging systems.

Barry Knotts
L-IV P, N4XE

On 3/5/2012 8:21 AM, Craig Gainza wrote:

Dear Listers,

Recently, I completed my annual and test flew the airplane. Upon lifting the gear both primary and secondary alternator field breakers popped. Pushed them back in and all charging returned to normal on the primary and secondary alternators.

Landed, checked connections, put in a different battery, ran through B and C voltage regulator troubleshooting guide (came out normal) and did a ground run up. When lifting the flaps, hydraulic pump kicked on both field breakers popped again. Right now I am assuming it is the voltage regulator (both pri and sec are B and C), alternator , or a connector.

Anyone have similar issues and can recommend the next course of action?

Thank you,

Craig Gainza
IV-P TSIOF 550
782 hours and holding

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