X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Wed, 25 Jan 2012 01:18:04 -0500 Message-ID: X-Original-Return-Path: Received: from nm15-vm0.bullet.mail.ne1.yahoo.com ([98.138.91.70] verified) by logan.com (CommuniGate Pro SMTP 5.4.3) with SMTP id 5362882 for lml@lancaironline.net; Tue, 24 Jan 2012 16:25:29 -0500 Received-SPF: none receiver=logan.com; client-ip=98.138.91.70; envelope-from=casey.gary@yahoo.com Received: from [98.138.90.55] by nm15.bullet.mail.ne1.yahoo.com with NNFMP; 24 Jan 2012 21:24:54 -0000 Received: from [98.138.89.175] by tm8.bullet.mail.ne1.yahoo.com with NNFMP; 24 Jan 2012 21:24:54 -0000 Received: from [127.0.0.1] by omp1031.mail.ne1.yahoo.com with NNFMP; 24 Jan 2012 21:24:54 -0000 X-Yahoo-Newman-Property: ymail-3 X-Yahoo-Newman-Id: 304343.64610.bm@omp1031.mail.ne1.yahoo.com Received: (qmail 40541 invoked by uid 60001); 24 Jan 2012 21:24:54 -0000 DomainKey-Signature:a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com; h=X-YMail-OSG:Received:X-Mailer:References:Message-ID:Date:From:Reply-To:Subject:To:In-Reply-To:MIME-Version:Content-Type; b=XLOlj65YVwfO9+dJwYTQ1bvynEvwORb0ToBCibWVRKE8tHIekzxFIpm18ShlLcmg3WxeRMa+MYd34pBI33qB3JoDAGpU9CW1PwPARk+9piCBpjYs/MySRZm1R7UGgKLiKWLXwfem4JobJ9MeFEOpJY501qRSHxQ2lmsl3j59Lpo=; X-YMail-OSG: lRfBNGAVM1k2nYm2TxQFR0Wx_yTUuGhYqQrA0YvkJmr.XHl Jav2jIQtoDNH3afMGKKh6ad8aj0PnrmfQ3gPX4RXmVcgBVlRJKCF_FlRpmQ2 s8T1u.EKxOikoKrvbuIsbx3g19lPoum_3pfLpdJ84ITy7EJiqcVSpBu7A9.F 5ZhqO.lX16226s11Ewnm2I7dnzVibA8lAEm4coOPOc5KMpNcXnP3h3J3pE.g DEI5LPNp7npDrN4y220GKHUwGLXgqJAXxtHmJ6HTpHYjgOFut482pLFzFLJr VIEYyZL3tNQCMkZswXuJfT9ntIU.4ax0IwtVK3W.gV6PRHpz1vTLqPjjfouu za2sEYSjwevaYF.rJmzoEXSoW3QNFqJkAXoICD2OYYwyeia.6E9OFZwU4hJt VZBLZ9XAMy_Q6ExoSjPWwjPsnAcQqKQUXNKYVLhaDdvKsMPwxCj9vj2uopGi c Received: from [71.218.234.116] by web125606.mail.ne1.yahoo.com via HTTP; Tue, 24 Jan 2012 13:24:53 PST X-Mailer: YahooMailWebService/0.8.116.331537 References: X-Original-Message-ID: <1327440293.40359.YahooMailNeo@web125606.mail.ne1.yahoo.com> X-Original-Date: Tue, 24 Jan 2012 13:24:53 -0800 (PST) From: Gary Casey Reply-To: Gary Casey Subject: Re: Fuselage access panel X-Original-To: Lancair Mailing List In-Reply-To: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="607277540-1208554064-1327440293=:40359" --607277540-1208554064-1327440293=:40359 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable This thread was called "oxygen tank location", but perhaps this is enough o= f a change of subject to justify changing the title.=0AI have an ES and the= access panel was already installed as part of the "fast build," so I left = it alone. =C2=A0During the building process I received a bulletin that reco= mmended changing the #6 screws to #8 in order to increase the strength and = stiffness of the access port. =C2=A0I didn't do it, but I wonder if I shoul= d have. =C2=A0Of course, now there is a paint issue, but maybe the structur= al integrity issue would make it worthwhile changing. =C2=A0I could also ad= d the large stainless washers to it and that should further increase the st= rength - and hurt the styling. =C2=A0Should I change these out? =C2=A0Note = that the ES has a much larger horizontal stab and therefore might be more s= ensitive to fuselage structure than the IV.=0AGary Casey=0A=0AWe have a cla= ssic example in the IV-P world where some builders decided it would be nice= to have the aft fuselage inspection panel hinged and latched for easier ac= cess. Turns out this panel is a part of the fuselage structure, and not mou= nting it with multiple screws, as specified in the plans, weakens the rear = fuselage. At least two IV-P=E2=80=99s have developed structural cracks from= the opening back to the horizontal tail. As far as I know, we=E2=80=99ve n= ot lost an airplane due to this, but on the other hand, we=E2=80=99ve proba= bly been lucky=E2=80=A6=C2=A0=C2=A0To the casual observer, this seems such = a trivial mod=E2=80=94the opening is only about 8=E2=80=9D x 12=E2=80=9D or= so=E2=80=94but the cover is designed to be a part of the fuselage structur= e=E2=80=A6an important part. It can=E2=80=99t work that way if not secured = all the way around it=E2=80=99s perimeter.=0A=C2=A0=0AHope this helps!=0A= =0ABob --607277540-1208554064-1327440293=:40359 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable
This thre= ad was called "oxygen tank location", but perhaps this is enough of a chang= e of subject to justify changing the title.
I have an ES and the = access panel was already installed as part of the "fast build," so I left i= t alone.  During the building process I received a bulletin that recom= mended changing the #6 screws to #8 in order to increase the strength and s= tiffness of the access port.  I didn't do it, but I wonder if I should= have.  Of course, now there is a paint issue, but maybe the structura= l integrity issue would make it worthwhile changing.  I could also add= the large stainless washers to it and that should further increase the str= ength - and hurt the styling.  Should I change these out?  Note t= hat the ES has a much larger horizontal stab and therefore might be more sensitive to fuselage structure than the IV.
Gary Casey

We have a classic example in the IV-P = world where some builders decided it would be nice to have the aft fuselage= inspection panel hinged and latched for easier access. Turns out this pane= l is a part of the fuselage structure, and not mounting it with multiple sc= rews, as specified in the plans, weakens the rear fuselage. At least two IV= -P=E2=80=99s have developed structural cracks from the opening back to the = horizontal tail. As far as I know, we=E2=80=99ve not lost an airplane due to this, bu= t on the other hand, we=E2=80=99ve probably been lucky=E2=80=A6 =  To the casual observer, this seems such a trivial mod=E2=80=94= the opening is only about 8=E2=80=9D x 12=E2=80=9D or so=E2=80=94but the co= ver is designed to be a part of the fuselage structure=E2=80=A6an important= part. It can=E2=80=99t work that way if not secured all the way around it= =E2=80=99s perimeter.
 
=
Hope this helps!
=
Bob
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