X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Sun, 24 Oct 2010 15:40:34 -0400 Message-ID: X-Original-Return-Path: Received: from cdptpa-omtalb.mail.rr.com ([75.180.132.123] verified) by logan.com (CommuniGate Pro SMTP 5.3.10) with ESMTP id 4524694 for lml@lancaironline.net; Sat, 23 Oct 2010 06:20:33 -0400 Received-SPF: pass receiver=logan.com; client-ip=75.180.132.123; envelope-from=super_chipmunk@roadrunner.com X-Original-Return-Path: X-Authority-Analysis: v=1.1 cv=uESSSoDEku2quKX/oFXS2Smn5+55LTFcWFr5T5T8nFs= c=1 sm=0 a=I8zE26c0Y9d50tWaRzAbIg==:17 a=sqVofR0iAAAA:8 a=Ia-xEzejAAAA:8 a=5Dwr0TDGs_bAqqQguOQA:9 a=NFvHnq35ntkGtEsktL8A:7 a=gQxSSE70hOhNxQ8yY9hvd_AVBP4A:4 a=wPNLvfGTeEIA:10 a=zDzhHx52XJMA:10 a=EzXvWhQp4_cA:10 a=rxoNyBSCAAAA:8 a=2OvS500D3PZoC9kluYgA:9 a=NISY3CAb86Cac-LtKKQA:7 a=ccHWVuZS6bjUYFXnT2QfIyk0t_oA:4 a=LJWTG3aW_KUA:10 a=I8zE26c0Y9d50tWaRzAbIg==:117 X-Cloudmark-Score: 0 X-Originating-IP: 74.65.190.246 Received: from [74.65.190.246] ([74.65.190.246:60561] helo=Laptop) by cdptpa-oedge01.mail.rr.com (envelope-from ) (ecelerity 2.2.3.46 r()) with ESMTP id F7/13-07087-DC6B2CC4; Sat, 23 Oct 2010 10:19:58 +0000 X-Original-Message-ID: <3F5F09DA44E9407A9148421BE069D362@Laptop> From: "Bill Wade" X-Original-To: "Lancair Mailing List" References: In-Reply-To: Subject: Re: [LML] Hydraulic hoses X-Original-Date: Sat, 23 Oct 2010 06:20:09 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_02CB_01CB727A.57D56310" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Windows Mail 6.0.6002.18197 X-MimeOLE: Produced By Microsoft MimeOLE V6.0.6002.18263 This is a multi-part message in MIME format. ------=_NextPart_000_02CB_01CB727A.57D56310 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable I'd suggest looking at http://www.sacskyranch.com/h_life.htm . Sky = Ranch also sells the "Mechanic's Toolbox" program which has a wealth of = information on aircraft components, including additional photos of = failed hoses. Are the hoses stiff? Do you feel them crackle or creak as you bend = them? If the exterior coating is breaking off that may be the case. You = didn't say what type of hose was used, but if they exhibit those = symptoms I was taught to replace them. If you're in doubt the best thing = would be to have an A&P look at them. Another consideration is the inner liner. It may be deteriorating = also. The hoses on my Navion were old but didn't show exterior = deterioration such as you describe. When I replaced them the hydraulic = fluid was black with small particles despite the fact that the system = has a substantial filter. Once new hoses were in place the fluid has = stayed clear. My conclusion is the inside of the hoses was sloughing = off. -Bill Wade ----- Original Message -----=20 From: George and Shirley Shattuck=20 To: lml@lancaironline.net=20 Sent: Wednesday, October 20, 2010 3:36 PM Subject: [LML] Hydraulic hoses Very timely, for me, are recent postings regarding hydraulic hoses. After 16 years, the outer rubber coating on my hoses is starting to = crack and, on many of my hoses, is actually breaking off, revealing the = white woven material. I have been watching this occur with some = concern. The question is: Is this an immediate safety concern? Is there = increased chances of a hose failure, and if so, how big a concern is it. = In other words, should the airplane be immediately grounded until I = fabricate new hoses?=20 These questions are for an experienced hydraulics person, and not for = emotional speculation by those seeking perfection. George Shattuck LNC2, 1350 flight hours ------=_NextPart_000_02CB_01CB727A.57D56310 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
  I'd suggest looking at http://www.sacskyranch.com= /h_life.htm .=20 Sky Ranch also sells the "Mechanic's Toolbox" program which has a wealth = of=20 information on aircraft components, including additional photos of = failed=20 hoses.
 
  Are the hoses stiff? Do you feel = them=20 crackle or creak as you bend them? If the exterior coating is = breaking off=20 that may be the case. You didn't say what type of hose was used, but if = they=20 exhibit those symptoms I was taught to replace them. If you're in=20 doubt the best thing would be to have an A&P look at = them.
 
  Another consideration is the = inner liner. It=20 may be deteriorating also. The hoses on my Navion were old but didn't = show=20 exterior deterioration such as you describe. When I replaced them the = hydraulic=20 fluid was black with small particles despite the fact = that the=20 system has a substantial filter. Once new hoses were in place the fluid = has=20 stayed clear. My conclusion is the inside of the hoses was sloughing = off. =20 -Bill Wade
 
 
 
 
----- Original Message -----
From:=20 George and Shirley = Shattuck=20
Sent: Wednesday, October 20, = 2010 3:36=20 PM
Subject: [LML] Hydraulic = hoses

Very timely, for me, are recent postings regarding hydraulic = hoses.
 
After 16 years, the outer rubber coating on my hoses is starting = to crack=20 and, on many of my hoses, is actually breaking off, revealing the = white woven=20 material.  I have been watching this occur with some = concern.
 
The question is: Is this an immediate safety concern?  Is = there=20 increased chances of a hose failure, and if so, how big a concern is = it. =20 In other words, should the airplane be immediately grounded until I = fabricate=20 new hoses? 
 
These questions are for an experienced hydraulics person, and not = for=20 emotional speculation by those seeking perfection.
 
George Shattuck
LNC2, 1350 flight hours
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