X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Fri, 27 Jun 2008 19:31:06 -0400 Message-ID: X-Original-Return-Path: Received: from [70.62.14.124] (HELO server1.USTEK) by logan.com (CommuniGate Pro SMTP 5.2.4) with ESMTP id 2993815 for lml@lancaironline.net; Fri, 27 Jun 2008 08:30:09 -0400 Received-SPF: none receiver=logan.com; client-ip=70.62.14.124; envelope-from=r.simon@ustek.com MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----_=_NextPart_001_01C8D851.F8951BB2" Subject: RE: Runaway Trim Content-class: urn:content-classes:message X-MimeOLE: Produced By Microsoft Exchange V6.5 X-Original-Date: Fri, 27 Jun 2008 08:33:20 -0400 X-Original-Message-ID: In-Reply-To: X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: Runaway Trim Thread-Index: AcjYUftq3QpIPgotThexABcp5S5BRQ== From: "Lancair" X-Original-Sender: "Robert Simon" X-Original-To: "Dennis Johnson" , This is a multi-part message in MIME format. ------_=_NextPart_001_01C8D851.F8951BB2 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable =20 From: Dennis Johnson [mailto:pinetownd@volcano.net]=20 Sent: Thursday, June 26, 2008 9:51 PM To: lml@lancaironline.net Subject: Runaway Trim My understanding from talking with the RAC guys, who make the trim components I installed in my Legacy, is that stuck (runaway) trim is unlikely. (Actually, they said it was impossible, but I find it hard to use that word.)=20 ________________________________ =20 A runaway trim seems unlikely to me too. There was one GlaStar incident a few years back that was attributed to such a failure while in the pattern. That incident resulted in two fatalities, and a design change to the GlaStar trim authority. Remembering that accident and having experienced the muscle required to overcome the mis-trim on my ES-P even when slowed to 90 kt, I figured I could either install a mechanical backup (not practical) or try an electrical approach. =20 =20 To eliminate runaway some installations have two buttons that must be pressed simultaneously to activate either direction. That eliminates runaway but not single-direction failure. In my failure mode it was not a runaway failure: I was able to trim nose-up but not nose-down. This new controller should allow me to reverse the previous direction bypassing the control stick buttons. So if after climb out I again could not trim nose-down I would be able to press the reverse button and reduce stick pressure. At least - that's the theory. =20 Robert M. Simon ES-P N301ES =20 =20 =20 ------_=_NextPart_001_01C8D851.F8951BB2 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

From: = Dennis Johnson=20 [mailto:pinetownd@volcano.net]
Sent: Thursday, June 26, 2008 = 9:51=20 PM
To: lml@lancaironline.net
Subject: Runaway=20 Trim
My understanding from talking with the RAC guys, who make = the=20 trim components I installed in my Legacy, is that stuck (runaway) trim = is=20 unlikely. (Actually, they said it was impossible, but I find it = hard to=20 use that word.)

A runaway trim seems unlikely to me too. = There was=20 one GlaStar incident a few years back that was attributed to such a = failure while in the pattern. That incident resulted in two=20 fatalities, and a design change to the GlaStar trim authority. =20 Remembering = that accident and=20 having experienced the muscle required to overcome the mis-trim on my = ES-P even=20 when slowed to 90 kt, I figured I could either install a mechanical = backup (not=20 practical) or try an electrical approach.

To eliminate runaway some installations have = two buttons=20 that must be pressed simultaneously to activate either=20 direction. That eliminates runaway but not single-direction=20 failure. In my failure mode it was not a runaway failure: I was = able to=20 trim nose-up but not nose-down. This new controller should allow = me to=20 reverse the previous direction bypassing the control stick = buttons. So if=20 after climb out I again could not trim nose-down I would be able to = press=20 the reverse button and reduce stick pressure. At least - that's = the=20 theory.

Robert M. Simon

ES-P N301ES

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