X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Thu, 26 Jan 2006 00:28:36 -0500 Message-ID: X-Original-Return-Path: Received: from imo-m24.mx.aol.com ([64.12.137.5] verified) by logan.com (CommuniGate Pro SMTP 5.0.7f) with ESMTP id 953606 for lml@lancaironline.net; Wed, 25 Jan 2006 15:57:42 -0500 Received-SPF: pass receiver=logan.com; client-ip=64.12.137.5; envelope-from=JIMRHER@aol.com Received: from JIMRHER@aol.com by imo-m24.mx.aol.com (mail_out_v38_r6.3.) id q.220.6d8720f (62976) for ; Wed, 25 Jan 2006 15:49:59 -0500 (EST) From: JIMRHER@aol.com X-Original-Message-ID: <220.6d8720f.31093e77@aol.com> X-Original-Date: Wed, 25 Jan 2006 15:49:59 EST Subject: Cabin Pressure loss at FL 210 follow up X-Original-To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1138222199" X-Mailer: 9.0 SE for Windows sub 5021 X-Spam-Flag: NO -------------------------------1138222199 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit I said I would follow up on what I discovered about my pressurization loss that I previously reported. The door seal switch was somehow turned to the Off position while in flight. We first looked at if it was possible to accidentally hit the switch and dump the seal pressure. We both feel that in no way did this happen. We have hundreds of pressurized hours and it never happened before. Secondly, I looked at the switch. I first thought that when in the ON position, the lever was pressing on the padded leather. On close examination the lever just Kisses the leather. I can't see any movement of the leather when switch is in the ON position. Next I tested the Switch detent, the Mfg. says it should have about 2.5 oz. and don't say in which direction or if in both directions. With no air on, the detent is probably 2.5 oz. from OFF to ON but in the opposite direction it is probably half that. At first I thought that this was the problem. I had others check new switches and they seem to be the same. I then Pressurized the door seal and checked the release detent. To my surprise the ON to OFF detent when under pressure is quit strong. I would say more than the 2.5 oz. in the rating spec. and it is very spring loaded from the neutral point to both the OFF and ON position. It is so strongly held in the ON position that one would have to be making a concentrated effort to turn it OFF. Bottom-line; I still don't know how this switch flipped to the OFF position. And replacing it with a new one doesn't seem to answer any question. Back to the mysteries of flight. Jim Hergert N6XE (An Sexy) L4P 365 hrs. -------------------------------1138222199 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

I said I would follow up on what I discovered about my pressurization l= oss=20 that I previously reported. The door seal switch was somehow turned to the O= ff=20 position while in flight.

We first looked at if it was possible to accidentally hit the switch an= d=20 dump the seal pressure. We both feel that in no way did this happen. We have= =20 hundreds of pressurized hours and it never happened before.

Secondly, I looked at the switch. I first thought that when in the ON=20 position, the lever was pressing on the padded leather. On close examination= the=20 lever just Kisses the leather. I can't see any movement of the leather when=20 switch is in the ON position. Next I tested the Switch detent, the Mfg.= =20 says it should have about 2.5 oz. and don't say in which direction or if in=20= both=20 directions. With no air on, the detent is probably 2.5 oz. from OFF to ON bu= t in=20 the opposite direction it is probably half that. At first I thought that thi= s=20 was the problem. I had others check new switches and they seem to be the sam= e. I=20 then Pressurized the door seal and checked the release detent. To my surpris= e=20 the ON to OFF detent when under pressure is quit strong. I would say more th= an=20 the 2.5 oz. in the rating spec. and it is very spring loaded from the neutra= l=20 point to both the OFF and ON position. It is so strongly held in the ON posi= tion=20 that one would have to be making a concentrated effort to turn it OFF.

Bottom-line; I still don't know how this switch flipped to the OFF=20 position. And replacing it with a new one doesn't seem to answer any questio= n.=20 Back to the mysteries of flight.=20

Jim Hergert
N6XE (An Sexy)
L4P 365=20 hrs.

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