X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Thu, 22 Jul 2010 21:39:55 -0400 Message-ID: X-Original-Return-Path: Received: from pop-borzoi.atl.sa.earthlink.net ([207.69.195.70] verified) by logan.com (CommuniGate Pro SMTP 5.3.8) with ESMTP id 4403692 for lml@lancaironline.net; Thu, 22 Jul 2010 21:19:37 -0400 Received-SPF: none receiver=logan.com; client-ip=207.69.195.70; envelope-from=andyw54_punt@earthlink.net Received: from user-11fb6lj.dsl.mindspring.com ([66.245.154.179] helo=andy71b082867c) by pop-borzoi.atl.sa.earthlink.net with smtp (Exim 3.36 #1) id 1Oc6uj-0002LN-00; Thu, 22 Jul 2010 21:19:01 -0400 X-Original-Message-ID: <81D8719E926E4CF3901F611884231FFA@andy71b082867c> From: "Andy Werback" X-Original-To: , "Art Jensen" References: Subject: Re: Need help X-Original-Date: Thu, 22 Jul 2010 18:19:00 -0700 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0065_01CB29CA.5B71AC20" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.5931 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5931 This is a multi-part message in MIME format. ------=_NextPart_000_0065_01CB29CA.5B71AC20 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi, Art, Wow, sure sounds like the alternator output is dropping and/or the = battery isn't able to hold normal bus voltage, and the regulator is = really trying to push up the field current. Seems like if you can = borrow a DC clip on ammeter, it would be interesting to know what the = gear pump is drawing - it definitly takes more power going up than down. = Would also be interesting to know what the "normal" field current for = the LR-3C is. Although 5 1/2A seems like more that I would expect. Andy ----- Original Message -----=20 From: Art Jensen=20 To: lml@lancaironline.net=20 Sent: Wednesday, July 21, 2010 1:00 PM Subject: Need help My volt 1 circuit breaker off the field of the altenator keeps = tripping when I cycle the gear. This happens 100% of the time when = going up and 20% going down. What I have done: The altenator was sent to Quality Aircraft in Tulsa and bench = checked putting out 75 amps under load. The tech. stated that the = altenator is as good as you could hope for one to be. 51/2 amps was run through the circuit breaker and it did not = trip. Replaced the battery checked for loose connections and worn wires. This is in a io-550 Legacy with a 14 Volt system. It has been = runing trouble free since March 2004 until one month ago. Has anyone = experienced this problem or have any ideas on what else I should check. = My A & P is out of ideas as am I. The plane has a B & C voltage regulator which is said to be very = dependable and in most Lancairs. At this time it is not suspected to be = the problem. Thanks in advance for any input. Art=20 ------=_NextPart_000_0065_01CB29CA.5B71AC20 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Hi, Art,
 
Wow, sure sounds like the alternator = output is=20 dropping and/or the battery isn't able to hold normal bus voltage, and = the=20 regulator is really trying to push up the field current.   = Seems like=20 if you can borrow a DC clip on ammeter, it would be interesting to know = what the=20 gear pump is drawing - it definitly takes more power going up than = down. =20 Would also be interesting to know what the "normal" field current for = the LR-3C=20 is.  Although 5 1/2A seems like more that I would = expect.
 
Andy
----- Original Message -----
From:=20 Art=20 Jensen
Sent: Wednesday, July 21, 2010 = 1:00=20 PM
Subject: Need help

My volt 1 circuit breaker off the field of the altenator=20 keeps tripping when I cycle the gear.  This happens = 100% of=20 the time when going up and 20% going down.
 
What I have done:
 
The altenator was sent to Quality Aircraft in Tulsa and = bench=20 checked putting out 75 amps under load.  The tech. stated = that the=20 altenator is as good as you could hope for one to be.
 
51/2 amps was run through the circuit breaker and it did = not=20 trip.
 
Replaced the battery
 
checked for loose connections and worn wires.
 
This is in a io-550 Legacy with a 14 Volt system.  It = has been=20 runing trouble free since March 2004 until one month ago.  = Has=20 anyone experienced this problem or have any ideas on what else I = should=20 check.  My A & P is out of ideas as am I.
 
The plane has a B & C voltage regulator which is said = to be=20 very dependable and in most Lancairs.  At this time it is = not=20 suspected to be the problem.
 
Thanks in advance for any input.
 
=
Art

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