X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [64.4.51.76] (HELO hotmail.com) by logan.com (CommuniGate Pro SMTP 4.3.2) with ESMTP id 960660 for flyrotary@lancaironline.net; Mon, 23 May 2005 12:36:51 -0400 Received-SPF: pass receiver=logan.com; client-ip=64.4.51.76; envelope-from=lors01@msn.com Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC; Mon, 23 May 2005 09:36:09 -0700 Message-ID: Received: from 64.4.51.220 by BAY107-DAV4.phx.gbl with DAV; Mon, 23 May 2005 16:36:09 +0000 X-Originating-IP: [64.4.51.220] X-Originating-Email: [lors01@msn.com] X-Sender: lors01@msn.com From: "Tracy Crook" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: EC2 problems Date: Mon, 23 May 2005 12:14:26 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0067_01C55F90.F6663570" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: MSN 9 X-MimeOLE: Produced By MSN MimeOLE V9.10.0011.1703 Seal-Send-Time: Mon, 23 May 2005 12:14:26 -0400 X-OriginalArrivalTime: 23 May 2005 16:36:09.0785 (UTC) FILETIME=[865C6A90:01C55FB5] This is a multi-part message in MIME format. ------=_NextPart_000_0067_01C55F90.F6663570 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hello John, True, the bench here is not perfect (and neither is the operator : ) Got your EC2 back today and have looked at it briefly. Visual = inspection showed that the input power filter choke was suspiciously = dark in color. Plugged the unit into the test bench and bench EM2 did = indeed show NOP in the Tach window which means the EC2 is not responding = to interrogation by the EM2. No ignition or injection pulses from the = EC2 at any rpm. Found that there was no +5 voltage on board. Cause = was the input filter choke being open. Replaced the choke and EC2 = became fully operational. =20 I must emphasize that the open choke was not an ordinary component = failure. It was burned open by an overload. The overload was not = caused by any problem in the EC2 so I have to conclude that it was = caused by an external wiring error or abnormal electrical system = voltage. I know you have checked the wiring innumerable times but I = can't draw any other conclusion. Wish I could point to the specific = area where the problem is but there are too many possibilities to make = any reasonable guesses. I'd fly down again to check it myself but = things have backed up way too far here in my absence. Tracy Crook =20 ----- Original Message -----=20 From: John Slade=20 To: Rotary motors in aircraft=20 Sent: Saturday, May 21, 2005 10:57 AM Subject: [FlyRotary] Re: EC2 problems=20 > Tracy's bench is not perfect, believe it or not :>) I guess nothing's perfect. That does complicate the logic doesn't it. I'll check around for voltages in the wrong places while I wait for = the diagnosis / repair. Thanks, John >> Homepage: http://www.flyrotary.com/ >> Archive: = http://lancaironline.net/lists/flyrotary/List.html ------=_NextPart_000_0067_01C55F90.F6663570 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Hello John,

True, the bench here is not perfect (and neither is the operator : = )

Got your EC2 back today and have looked at it briefly. Visual = inspection showed that the input power filter choke was suspiciously = dark in=20 color. Plugged the unit into the test bench and bench EM2 did = indeed show=20 NOP in the Tach window which means the EC2 is not responding to=20 interrogation by the EM2. No ignition or injection pulses = from the=20 EC2 at any rpm. Found that there was no +5 voltage = on=20 board. Cause was the input filter choke being = open. =20 Replaced the choke and EC2 became fully operational.

I must emphasize that the open choke was not an ordinary component=20 failure. It was burned open by an overload. The overload was = not=20 caused by any problem in the EC2 so I have to conclude that it was = caused by an=20 external wiring error or abnormal electrical system voltage. I = know you=20 have checked the wiring innumerable times but I can't draw any other=20 conclusion. Wish I could point to the specific area where the = problem is=20 but there are too many possibilities to make any reasonable = guesses. I'd=20 fly down again to check it myself but things have backed up way too = far=20 here in my absence.

Tracy Crook

----- Original Message -----

From: John=20 Slade

To: Rotary motors in = aircraft

Sent: Saturday, May 21, 2005 = 10:57=20 AM

Subject: [FlyRotary] Re: EC2 = problems=20

> Tracy's bench is not perfect, believe it or not=20 :>)
I guess nothing's perfect. That does complicate the logic = doesn't=20 it.

I'll check around for voltages in the wrong places while I = wait for=20 the
diagnosis / = repair.
Thanks,
John

>> =20 Homepage: http://www.flyrotary.com/
>&= gt; =20 Archive: http://lancai= ronline.net/lists/flyrotary/List.html

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