X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Tue, 25 Mar 2008 10:43:55 -0400 Message-ID: X-Original-Return-Path: Received: from mail15.syd.optusnet.com.au ([211.29.132.196] verified) by logan.com (CommuniGate Pro SMTP 5.2.1) with ESMTPS id 2816848 for lml@lancaironline.net; Tue, 25 Mar 2008 06:48:34 -0400 Received-SPF: pass receiver=logan.com; client-ip=211.29.132.196; envelope-from=fredmoreno@optusnet.com.au Received: from fred ([202.139.5.198]) (authenticated sender fredmoreno) by mail15.syd.optusnet.com.au (8.13.1/8.13.1) with ESMTP id m2PAlbW9005167 for ; Tue, 25 Mar 2008 21:47:46 +1100 From: "Fred Moreno" X-Original-To: "Lancair Mail" Subject: LIV door seal question - non-pressurized aircraft X-Original-Date: Tue, 25 Mar 2008 19:47:39 +0900 X-Original-Message-ID: <020c01c88e65$ac1de2e0$c6058bca@fred> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_020D_01C88EB1.1C058AE0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6822 Thread-Index: AciOZaSeScAqu04ATcWHVZ5c+ttUcw== X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3198 Importance: Normal This is a multi-part message in MIME format. ------=_NextPart_000_020D_01C88EB1.1C058AE0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable I am about to install the pressurized door seal on my unpressurized LIV. = .=20 =20 For my aircraft, I wonder if the mating silicone tape that is bonded to = the door frame is truly required. The greatest delta P I can imagine across = the door is about 0.3 psi, far short of the 5.5 psi of the pressurized = aircraft. I can see that the silicone tape may be required to hold the door seal = in place against the pressurization forces, but it seems like overkill for = the unpressurized aircraft. =20 Earlier discussions suggested reducing the air pressure from 20 psi to = about 11 psig (if I recall correctly) to extend the seal lifetime. This was = for pressurized aircraft. =20 Questions:=20 =20 1) Can I eliminate the silicone tape on the door frame and let the = seal seat on the paint of the door frame? Eliminating the silicon tape would save a step and provide a cleaner installation. 2) Can I further reduce the required pressure? I would think I = could go to a low pressure (say 5-8 psi), flight test, raise it a bit if I get a leak, test again, etc.=20 =20 Any of you non-pressurized guys have any advice or recommendations? =20 Thanks,=20 =20 Fred Moreno ------=_NextPart_000_020D_01C88EB1.1C058AE0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

I am about to install the pressurized door seal on my unpressurized LIV.  .

 

For my aircraft, I wonder if the mating silicone tape = that is bonded to the door frame is truly required.  The greatest delta = P I can imagine across the door is about 0.3 psi, far short of the 5.5 psi of = the pressurized aircraft.  I can see that the silicone tape may be = required to hold the door seal in place against the pressurization forces, but it = seems like overkill for the unpressurized aircraft.

 

Earlier discussions suggested reducing the air = pressure from 20 psi to about 11 psig (if I recall correctly) to extend the seal lifetime.  This was for pressurized aircraft.

 

Questions:

 

1)     Can I eliminate the silicone tape on the door frame and let the seal seat on = the paint of the door frame?  Eliminating the silicon tape would save a = step and provide a cleaner installation.

2)     Can I further reduce the required pressure?  I would think I could go = to a low pressure (say 5-8 psi), flight test, raise it a bit if I get a leak, = test again, etc.

 

Any of you non-pressurized guys have = any advice or = recommendations?

 

Thanks,

 

Fred Moreno

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