X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Tue, 08 Oct 2013 12:22:10 -0400 Message-ID: X-Original-Return-Path: Received: from mail.rbr3.com ([72.15.229.5] verified) by logan.com (CommuniGate Pro SMTP 6.0.7) with ESMTPS id 6506975 for lml@lancaironline.net; Tue, 08 Oct 2013 12:09:21 -0400 Received-SPF: pass receiver=logan.com; client-ip=72.15.229.5; envelope-from=Shane@rbr3.com Received: from RBR-SERVER.rbr3.local ([fe80::6a00:c85b:532f:c20e]) by RBR-SERVER.rbr3.local ([fe80::6a00:c85b:532f:c20e%10]) with mapi; Tue, 8 Oct 2013 12:07:23 -0400 From: Shane Bangerter X-Original-To: 'Lancair Mailing List' X-Original-Date: Tue, 8 Oct 2013 12:07:22 -0400 Subject: RE: [LML] Re: Cabin door strut on IV series Thread-Topic: [LML] Re: Cabin door strut on IV series Thread-Index: Ac7ELAw5dp8zedJBTJafF3nm4LMTAAAFBw8w X-Original-Message-ID: References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: acceptlanguage: en-US Content-Type: multipart/alternative; boundary="_000_F86615B51FD0F24B80B59522E5CB0E7B0401CC03B7RBRSERVERrbr3_" MIME-Version: 1.0 --_000_F86615B51FD0F24B80B59522E5CB0E7B0401CC03B7RBRSERVERrbr3_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Brad, the stud on my door looks to be a bit loose. Is there an easy fix be= fore it completely fails? Shane 89GG From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of Brad= Simmons Sent: Tuesday, October 08, 2013 8:42 AM To: lml@lancaironline.net Subject: [LML] Re: Cabin door strut on IV series John, I could not view your YouTube video; it asked for a log in... Door strut damage is becoming a common item as the fleet ages. We are seein= g problems on probably a 3rd of the planes that we service. There have also= been at least a couple of cracked windows possibly attributed to the door = strut stress placed on the door. Assuming your ball and socket alignment isn't so bad that the range or moti= on is exceeded, the other common issue is the stud wallowing out the hole t= hrough the carbon frame. Once it begins to move around, the threads will qu= ickly open up the hole diameter, and as the assembly becomes loose, the soc= ket will either pop off, or damage the fingers in the socket. There's more than one kind of ball and socket floating around out there, al= so. Some don't have the same amount of motion as others, so if your replace= ment strut did not come from Lancair, make sure that the similar ends will = actually allow the needed rotation. Adding a strap to the door to allow you to cushion the opening is a good id= ea also. I still see folks that land, unlatch the door and just push it up = and allow it to open on it's own (and you know who you are!!!). I can just = about guarantee you that the ball studs will be loose in their composite mo= unts. Brad Simmons Airframes Inc. 39 Airport Rd. Milan, TN 38358 731-686-3610 731-686-3613 fax www.airframesinc.com ----- Original Message ----- From: John Barrett To: lml@lancaironline.net Sent: Tuesday, October 08, 2013 6:55 AM Subject: [LML] Cabin door strut on IV series Hi all, I have to say that my first attendance to a LOBO fly in was awesome ( to us= e my children's and their children's cliche). The chance to meet so many e= nthusiastic, knowledgeable and fun Lancair folks provided WAY more benefit = than I ever would have imagined. Thank you to the board, the vendors, pres= enters and to everyone involved. I loved it and so did my wife, Anne. I saw some folks examining a IVP door strut on Saturday I think. The attac= hment at the frame was very loose so that the ball stud was flopping around= . Close inspection showed that the door frame was cracked under the stud. = I'm not sure whose plane this was but I think it is the one that vibration= measurement equipment had recently been attached to for studies. The door strut triggered memories of similar occurrence with my strut a co= uple of years ago prior to first flight. I would guess the smart folks who= noticed this also figured out the reason for the failure, but just in case= I will share what I found and how I dealt with it. The problem with the door strut is that the arc described by the strut duri= ng opening and closing exceeds the range of motion built into the ball stud= socket on the lower end of the strut. Therefore the door frame is wrenche= d back and forth during door operation when the stud is attached to the doo= r frame without modification to the frame. There is a plane you can find b= y experimentation or by mathematical exercise if you are so gifted and incl= ined to pursue (I am not) that will allow the socket to move within the des= ign limits and therefore not stress the stud and the door frame. Once this= plane is determined, you can use a small washer of wood, foam or other mat= erial to shape the door frame where the stud penetrates the frame. You'll = need to cut out a bit of the frame to accomplish this. since my frame was = broken here it made that part simple. Super glue or hot glue can hold the = form in place. Then lay up two BID of carbon fibre cloth over the form and= remove the form material when done. Lay up several layers on the back sid= e to strengthen the mod and to secure it by sandwiching on both sides of re= maining frame. It gets a little more complicated because the back side in my case was in v= ery tight quarters. When complete I found that the screw stud on the ball s= tud part was too short. I was able to go online and find a replacement at = very nominal cost and that had plenty of thread length for the purpose. I have uploaded a video to YouTube of the way the attachment looks now. Se= e link below. I hope it helps someone. http://youtu.be/d3sBMgVncMM John Barrett N31VP Sent from my iPad --_000_F86615B51FD0F24B80B59522E5CB0E7B0401CC03B7RBRSERVERrbr3_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

= Brad, the stud on my door looks to be a bit loose.  Is there an= easy fix before it completely fails?

 

Shane

 

89GG

 

= From:= Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of Br= ad Simmons
Sent: Tuesday, October 08, 2013 8:42 AM
To: = lml@lancaironline.net
Subject: [LML] Re: Cabin door strut on IV s= eries

 

John,

I = could not view your YouTube video; it asked for a log in...

 

Door strut damage is becoming a common item as the fleet ages. We ar= e seeing problems on probably a 3rd of the planes that we service. There ha= ve also been at least a couple of cracked windows possibly attributed to th= e door strut stress placed on the door.

Assuming your ball and socket alignment isn't so bad that the ran= ge or motion is exceeded, the other common issue is the stud wallowing out = the hole through the carbon frame. Once it begins to move around, the threa= ds will quickly open up the hole diameter, and as the assembly becomes loos= e, the socket will either pop off, or damage the fingers in the socket.

There's more than one kind of ball= and socket floating around out there, also. Some don't have the same amoun= t of motion as others, so if your replacement strut did not come from Lanca= ir, make sure that the similar ends will actually allow the needed rot= ation.

Adding a strap to the d= oor to allow you to cushion the opening is a good idea also. I still see fo= lks that land, unlatch the door and just push it up and allow it to open on= it's own (and you know who you are!!!). I can just about guarantee you tha= t the ball studs will be loose in their composite mounts.=

 

Brad Simmons
Airframes Inc.
39 Airport Rd.
Milan, TN=   38358
731-686-3610
731-686-3613 fax
www.airframesinc.com

=

----- Original Message -----

<= div>

From: John Barrett <= /span>

Sent: Tuesday, October 08, 2013 6:= 55 AM

Subject:<= span style=3D'font-size:10.0pt;font-family:"Arial","sans-serif"'> [LML] Cab= in door strut on IV series

 

Hi all,

 

I have to say that my first attendance to a LOBO fly in was = awesome ( to use my children's and their children's cliche).  The chan= ce to meet so many enthusiastic, knowledgeable and fun Lancair folks provid= ed WAY more benefit than I ever would have imagined.  Thank you to the= board, the vendors, presenters and to everyone involved.  I loved it = and so did my wife, Anne.  

 

I saw some folks e= xamining a IVP door strut on Saturday I think.  The attachment at the = frame was very loose so that the ball stud was flopping around.  Close= inspection showed that the door frame was cracked under the stud.  I'= m not sure whose plane this was but I think it is the one that vibration me= asurement equipment had recently been attached to for studies.

 

The door strut triggered memories of  similar occurrence = with my strut a couple of years ago prior to first flight.  I would gu= ess the smart folks who noticed this also figured out the reason for the fa= ilure, but just in case I will share what I found and how I dealt with it.<= o:p>

 

The problem with the door strut is that the arc des= cribed by the strut during opening and closing exceeds the range of motion = built into the ball stud socket on the lower end of the strut.  Theref= ore the door frame is wrenched back and forth during door operation when th= e stud is attached to the door frame without modification to the frame. &nb= sp;There is a plane you can find by experimentation or by mathematical exer= cise if you are so gifted and inclined to pursue (I am not) that will allow= the socket to move within the design limits and therefore not stress the s= tud and the door frame.  Once this plane is determined, you can use a = small washer of wood, foam or other material to shape the door frame where = the stud penetrates the frame.  You'll need to cut out a bit of the fr= ame to accomplish this.  since my frame was broken here it made that p= art simple.  Super glue or hot glue can hold the form in place.  = Then lay up two BID of carbon fibre cloth over the form and remove the form= material when done.  Lay up several layers on the back side to streng= then the mod and to secure it by sandwiching on both sides of remaining fra= me. 

It gets a little more complicated because the back side in= my case was in very tight quarters. When complete I found that the screw s= tud on the ball stud part was too short.  I was able to go online and = find a replacement at very nominal cost and that had plenty of thread lengt= h for the purpose.



I have uploaded a video to You= Tube of the way the attachment looks now.  See link below.  I hop= e it helps someone.



<= o:p>


John Barrett

N31VP


Sent from my iPad=

 

= = --_000_F86615B51FD0F24B80B59522E5CB0E7B0401CC03B7RBRSERVERrbr3_--