X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Fri, 03 Feb 2012 08:02:36 -0500 Message-ID: X-Original-Return-Path: Received: from cdptpa-omtalb.mail.rr.com ([75.180.132.120] verified) by logan.com (CommuniGate Pro SMTP 5.4.4) with ESMTP id 5380463 for lml@lancaironline.net; Thu, 02 Feb 2012 14:54:58 -0500 Received-SPF: pass receiver=logan.com; client-ip=75.180.132.120; envelope-from=tednoel@cfl.rr.com X-Original-Return-Path: X-Authority-Analysis: v=2.0 cv=ad3jbGUt c=1 sm=0 a=Juz4b5MAAxrvp7e3l7SsjA==:17 a=SHQDgO6TkQYA:10 a=CjxXgO3LAAAA:8 a=3oc9M9_CAAAA:8 a=Ia-xEzejAAAA:8 a=oCcaPWc0AAAA:8 a=SgfBIJ7bqlgNB1gsG1sA:9 a=a89vVq5C--E9TewZkXwA:7 a=wPNLvfGTeEIA:10 a=rC2wZJ5BpNYA:10 a=U8Ie8EnqySEA:10 a=EzXvWhQp4_cA:10 a=4PR2P7QzAAAA:8 a=1hOwHifx0_9WdnlG6fUA:9 a=8fKP6vzWfS721dEsipsA:7 a=_W_S_7VecoQA:10 a=djSSOgbfo6cA:10 a=Juz4b5MAAxrvp7e3l7SsjA==:117 X-Cloudmark-Score: 0 X-Originating-IP: 97.101.122.192 Received: from [97.101.122.192] ([97.101.122.192:49488] helo=[192.168.1.2]) by cdptpa-oedge04.mail.rr.com (envelope-from ) (ecelerity 2.2.3.46 r()) with ESMTP id C6/97-01110-DE9EA2F4; Thu, 02 Feb 2012 19:54:22 +0000 X-Original-Message-ID: <4F2AE9F1.1000901@cfl.rr.com> X-Original-Date: Thu, 02 Feb 2012 14:54:25 -0500 From: Ted Noel Reply-To: tednoel@cfl.rr.com User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:9.0) Gecko/20111222 Thunderbird/9.0.1 MIME-Version: 1.0 X-Original-To: Lancair Mailing List Subject: Re: [LML] Re: LML IV-P Door References: In-Reply-To: Content-Type: multipart/alternative; boundary="------------070100020304000606080609" This is a multi-part message in MIME format. --------------070100020304000606080609 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit This raises a question. If a bailout became necessary, would it be made easier by leaving the seal inflated when releasing the latches? I've tried to open the door with the seal inflated but all latches open. I can't do it. Perhaps the seal would hold enough to release the latches properly and the deflate the seal Ted Noel On 2/2/2012 7:34 AM, cwfmd@yahoo.com wrote: > Would the IV-P door open in flight, if unlocked from a latched, > initial condition?. With ground tests only, here in the hangar, it > seems like Bernoulli's forces, pulling outward against the large > surface area of the door, against the latch, would cause the lower > hooks to remain engaged, even after the handle is fully open.. On the > ground, try (pushing or) pulling outward on the door to simulate > this negative pressure(inflight). It seems like the lower latch > hooks could jam and interfere with a bail out attempt. This seems to > be the result. if you go from fully latched, to unlocking the handles. > I wonder if the incidents mentioned might have happened from a > completely unlatched condition on takeoff? This is also more likely > scenario, to strike the right flap? > A concise description of such an inflight experience, and your > observations of the sequence, would be very useful. Do vibrations or > oscillations cause the door to separate? Was there some > other structural failure of the door, causing it to open? When did it > happen in the sequence of events? It would be important guidance, in > designing or considering bailout systems or egress methods, inflight. > Thanks > Bill Miller > From: > "Jeff Edwards" > To: > lml@lancaironline.net > If it hits the tail you will probably lose the aircraft. > > AvSafe > Jeff Edwards > > No virus found in this message. > Checked by AVG - www.avg.com > Version: 2012.0.1913 / Virus Database: 2112/4779 - Release Date: 02/01/12 > --------------070100020304000606080609 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit This raises a question. If a bailout became necessary, would it be made easier by leaving the seal inflated when releasing the latches? I've tried to open the door with the seal inflated but all latches open. I can't do it. Perhaps the seal would hold enough to release the latches properly and the deflate the seal

Ted Noel

On 2/2/2012 7:34 AM, cwfmd@yahoo.com wrote:
Would the IV-P door open in flight, if unlocked from a latched, initial condition?. With ground tests only, here in the hangar, it seems like Bernoulli's forces, pulling outward against the large surface area of the door, against the latch, would cause the lower hooks to remain engaged, even after the handle is fully open.. On the ground, try (pushing or) pulling outward on the door to simulate this negative pressure(inflight). It seems like the lower latch hooks could jam and interfere with a bail out attempt. This seems to be the result. if you go from fully latched, to unlocking the handles. I wonder if the incidents mentioned might have happened from a completely unlatched condition on takeoff? This is also more likely scenario, to strike the right flap?
 A concise description of such an inflight experience, and your observations of the sequence, would be very useful. Do vibrations or oscillations cause the door to separate? Was there some other structural failure of the door, causing it to open? When did it happen in the sequence of events?  It would be important guidance, in designing or considering bailout systems or egress methods, inflight.
Thanks
Bill Miller
 
From:
To:
lml@lancaironline.net
If it hits the tail you will probably lose the aircraft.

AvSafe 
Jeff Edwards

No virus found in this message.
Checked by AVG - www.avg.com
Version: 2012.0.1913 / Virus Database: 2112/4779 - Release Date: 02/01/12

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