X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Thu, 29 Apr 2010 14:10:11 -0400 Message-ID: X-Original-Return-Path: Received: from elasmtp-spurfowl.atl.sa.earthlink.net ([209.86.89.66] verified) by logan.com (CommuniGate Pro SMTP 5.3.6) with ESMTP id 4240610 for lml@lancaironline.net; Wed, 28 Apr 2010 17:24:12 -0400 Received-SPF: none receiver=logan.com; client-ip=209.86.89.66; envelope-from=douglasbrunner@earthlink.net DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=dk20050327; d=earthlink.net; b=imAJ3rmp3CqQV79+fbYw9TAzAjmmdNd8Ra5SSof/UbTPVaXYUZWnJlgglmloOu7A; h=Received:From:To:References:In-Reply-To:Subject:Date:Message-ID:MIME-Version:Content-Type:X-Mailer:Thread-Index:Content-Language:X-ELNK-Trace:X-Originating-IP; Received: from [74.93.196.177] (helo=DougsLaptop) by elasmtp-spurfowl.atl.sa.earthlink.net with esmtpa (Exim 4.67) (envelope-from ) id 1O7EjH-0005OB-Ew for lml@lancaironline.net; Wed, 28 Apr 2010 17:23:35 -0400 From: "Douglas Brunner" X-Original-To: "'Lancair Mailing List'" References: In-Reply-To: Subject: RE: [LML] Alternator Failure Question X-Original-Date: Wed, 28 Apr 2010 17:23:38 -0400 X-Original-Message-ID: <001c01cae719$11ad2900$35077b00$@net> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_001D_01CAE6F7.8A9B8900" X-Mailer: Microsoft Office Outlook 12.0 Thread-Index: AcrnFJZFUQLWlA5cSsaCAEf1FS+IsAAAp4bg Content-Language: en-us X-ELNK-Trace: ad85a799c4f5de37c2eb1477c196d22294f5150ab1c16ac04e761f5d55cab8bc43b1101e0c1b099240902421fe098a57350badd9bab72f9c350badd9bab72f9c X-Originating-IP: 74.93.196.177 This is a multi-part message in MIME format. ------=_NextPart_000_001D_01CAE6F7.8A9B8900 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit David, Just got done with a long and difficult trouble shooting experience of intermittent electrical problems in my Legacy. First of all, the mechanic I was working with told me that Kelly alternators have a bad reputation for reliability. Based on that, we swapped it out for a rebuilt Continental alternator. That turned out NOT to be the problem. We checked all the leads and redid the grounds thinking that might be the problem. That turned out NOT to be the problem. We found out that my dual alternator, dual bus system was cross-feeding between bus 1 and 2. I operated on only one alternator. That turned out NOT to be the problem. All of these "fixes" worked well for about the first 30 minutes of every flight. However, after about 30 minutes the problem would develop again. Eventually, we replaced my voltage regulator, which (as I reconstruct the problem) had probably gotten wet due to a problem with my canopy seal. That turned out to BE the problem. Good luck! If you are a devotee of a primitive religion, you could consider sacrificing a goat or chicken to the electrical gods. Who knows, it might help! (No animals were harmed in the writing of this email) D. Brunner N241DB From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of Taylor, David Sent: Wednesday, April 28, 2010 4:51 PM To: lml@lancaironline.net Subject: [LML] Alternator Failure Question This is probably a question for my mechanic, but can alternators start failing after 180 hours on IO-550's? Is failure typically intermittent? (I am getting intermittent drop-offs in the Amps reading on my engine monitor - down to single digits and then negative amps in the teens and then the system restores to normal after 1-2 minutes.) David Taylor Lancair Legacy dtaylor@crescentpark.com ------=_NextPart_000_001D_01CAE6F7.8A9B8900 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

David,

 

Just got done with a = long and difficult trouble shooting experience of intermittent electrical = problems in my Legacy.

 

First of all, the = mechanic I was working with told me that Kelly alternators have a bad reputation for = reliability.  Based on that, we swapped it out for a rebuilt Continental = alternator.  That turned out NOT to be the problem.

 

We checked all the = leads and redid the grounds thinking that might be the problem.  That turned = out NOT to be the problem.

 

We found out that my = dual alternator, dual bus system was cross-feeding between bus 1 and 2.  = I operated on only one alternator.  That turned out NOT to be the = problem. 

 

All of these = “fixes” worked well for about the first 30 minutes of every flight.  = However, after about 30 minutes the problem would develop again. =

 

Eventually, we = replaced my voltage regulator, which (as I reconstruct the problem) had probably = gotten wet due to a problem with my canopy seal.  That turned out to BE the = problem.

 

Good = luck!

 

If you are a devotee = of a primitive religion, you could consider sacrificing a goat or chicken to = the electrical gods.  Who knows, it might help!  (No animals were = harmed in the writing of this email)

 

D. = Brunner

N241DB

 

From:= Lancair = Mailing List [mailto:lml@lancaironline.net] On Behalf Of Taylor, = David
Sent: Wednesday, April 28, 2010 4:51 PM
To: lml@lancaironline.net
Subject: [LML] Alternator Failure Question

 

This is probably a question for my mechanic, but = can alternators start failing after 180 hours on IO-550’s?  Is = failure typically intermittent?

 

(I am getting intermittent drop-offs in the Amps = reading on my engine monitor – down to single digits and then negative amps = in the teens and then the system restores to normal after 1-2 = minutes.)

 

 

 

David Taylor

Lancair Legacy
dtaylor@crescentpark.com

 

------=_NextPart_000_001D_01CAE6F7.8A9B8900--