Return-Path: Sender: "Marvin Kaye" To: lml@lancaironline.net Date: Wed, 22 Dec 2004 12:31:20 -0500 Message-ID: X-Original-Return-Path: Received: from tomts10-srv.bellnexxia.net ([209.226.175.54] verified) by logan.com (CommuniGate Pro SMTP 4.2.5) with ESMTP id 576738 for lml@lancaironline.net; Wed, 22 Dec 2004 10:42:53 -0500 Received-SPF: none receiver=logan.com; client-ip=209.226.175.54; envelope-from=ian.crowe@sympatico.ca Received: from crowe ([69.159.72.248]) by tomts10-srv.bellnexxia.net (InterMail vM.5.01.06.10 201-253-122-130-110-20040306) with SMTP id <20041222154224.GPQA1863.tomts10-srv.bellnexxia.net@crowe> for ; Wed, 22 Dec 2004 10:42:24 -0500 X-Original-Message-ID: <02bd01c4e83c$e0cb2cf0$6721fea9@crowe> From: "Ian B. Crowe" X-Original-To: "Lancair Mailing List" Subject: 320/360 gear extension failure- a theory X-Original-Date: Wed, 22 Dec 2004 10:42:39 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_02BA_01C4E812.F57E0A70" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2180 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 This is a multi-part message in MIME format. ------=_NextPart_000_02BA_01C4E812.F57E0A70 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Re Scott's post of 12/21/04 I was fascinated to see a figure of 25lb = given as a test parmeter to determine the effectiveness of the gas = spring used for emergency extension of the nose gear. I presume that this is a calculated figure using the lengths of the = mving parts of the mechanism related to the 100lb gas spring. Could = Scott tell us where this figure came from and whp originally devised it. = I hafd been fussing over the item on the annual which calls for a test = to verify the gas spring and had not as yet come up with an in situ = test. takung the gas spring off to test it is a pain. Incidentally I have had the pressure on both sides syndrome. So far = only when I have had the plane on jacks. Eventually it bleeds off. All = pressures are to specification. The other thing that has happened to me is that the RH inner gear door = is slow to close and the propwash appears to be bending the actuating = cylinder rod end and also twisting the hinge and causing it to crack at = the after end. It works fine in the barn!! I cannot find a reason for = it other than the pressure does not peak and shut off until the door is = closed. I have HP and LP pressure gauges. Right now I fly with the = door off and I do not notice any difference in IAS. Spitfires had no = inner doors! Ian Crowe I am going to take my pump off and have it overhauled ------=_NextPart_000_02BA_01C4E812.F57E0A70 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Re Scott's post of 12/21/04 I was = fascinated to see=20 a figure of 25lb given as a test parmeter to determine the effectiveness = of the=20 gas spring used for emergency extension of the nose gear.

I presume that this is a calculated = figure using=20 the lengths of the mving parts of the mechanism related to the 100lb gas = spring. Could Scott tell us where this figure came from and whp = originally=20 devised it. I hafd been fussing over the item on the annual which = calls=20 for a test to verify the gas spring and had not as yet come up with an = in situ=20 test. takung the gas spring off to test it is a pain.

Incidentally I have had the pressure on = both sides=20 syndrome. So far only when I have had the plane on jacks. = Eventually=20 it bleeds off. All pressures are to specification.

The other thing that has happened to me = is that the=20 RH inner gear door is slow to close and the propwash appears to be = bending the=20 actuating cylinder rod end and also twisting the hinge and causing it to = crack=20 at the after end. It works fine in the barn!! I cannot find = a reason=20 for it other than the pressure does not peak and shut off until the door = is=20 closed. I have HP and LP pressure gauges. Right now I fly = with the=20 door off and I do not notice any difference in IAS. Spitfires had = no inner=20 doors!

Ian Crowe

I am going to take my pump off and have = it=20 overhauled

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