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Kelly McMullen
Joined: 16 Apr 2008
Posts: 1188
Location: Sun Lakes AZ
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 Posted: Sat Apr 15, 2017 5:15 am Post subject: F-10108A Support Bracket Fracture |
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As I thought I was closing up from my condition inspection, I discovered that the rear cowl support, F-10108A (page 47-11&12) had fractured at the bend where it attaches to the firewall. I'm thinking about using some angle aluminum to replace that bend, at least for now. I'm guessing that the bend when the part was made weakened the aluminum, and the vibration/fiberglass flexing and stress from removal and reinstall of cowling made the failure inevitable. Perhaps the fact that I used quick release fasteners instead of piano hinges may focus more stress on the part. Just wondering if anyone else has had a failure there
Kelly-sent from the I-droid implanted in my forearm
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Kelly McMullen
A&P/IA, EAA Tech Counselor
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jesse(at)saintaviation.co
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| Posted: Sat Apr 15, 2017 5:38 am Post subject: F-10108A Support Bracket Fracture |
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This is very common and your proposed fix is exactly what I do.
Jesse Saint
Saint Aviation, Inc.
jesse(at)saintaviation.com
C: 352-427-0285
F: 815-377-3694
Sent from my iPhone
| Quote: | On Apr 15, 2017, at 9:15 AM, Kelly McMullen <apilot2(at)gmail.com> wrote:
As I thought I was closing up from my condition inspection, I discovered that the rear cowl support, F-10108A (page 47-11&12) had fractured at the bend where it attaches to the firewall. I'm thinking about using some angle aluminum to replace that bend, at least for now. I'm guessing that the bend when the part was made weakened the aluminum, and the vibration/fiberglass flexing and stress from removal and reinstall of cowling made the failure inevitable. Perhaps the fact that I used quick release fasteners instead of piano hinges may focus more stress on the part. Just wondering if anyone else has had a failure there
Kelly
-sent from the I-droid implanted in my forearm
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| | - The Matronics RV10-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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Tim Olson
Joined: 25 Jan 2007
Posts: 2872
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| Posted: Sat Apr 15, 2017 5:48 am Post subject: F-10108A Support Bracket Fracture |
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I used screws and plates and mine has never fractured that part. Frankly I surprised of that. Just a data point.
Tim
| Quote: | On Apr 15, 2017, at 8:15 AM, Kelly McMullen <apilot2(at)gmail.com> wrote:
As I thought I was closing up from my condition inspection, I discovered that the rear cowl support, F-10108A (page 47-11&12) had fractured at the bend where it attaches to the firewall. I'm thinking about using some angle aluminum to replace that bend, at least for now. I'm guessing that the bend when the part was made weakened the aluminum, and the vibration/fiberglass flexing and stress from removal and reinstall of cowling made the failure inevitable. Perhaps the fact that I used quick release fasteners instead of piano hinges may focus more stress on the part. Just wondering if anyone else has had a failure there
Kelly
-sent from the I-droid implanted in my forearm
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| | - The Matronics RV10-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RV10-List |
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philperry9
Joined: 23 Nov 2011
Posts: 381
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| Posted: Sat Apr 15, 2017 6:17 am Post subject: F-10108A Support Bracket Fracture |
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I've noticed that mine will fold up under the cowling if I'm not careful when sliding the lower cowl on. Then it takes some effort to get into out of a bind and into the right position.
It's certainly a bracket prone to eventually failing on my plane at least. If I'm careful it will be fine, but it's hard to be careful when you're wrestling that lower cowling around 3 blades and a nose gear. Practice makes closer to perfect anyway.
Phil
Sent from my iPhone
| Quote: | On Apr 15, 2017, at 8:36 AM, Jesse Saint <jesse(at)saintaviation.com> wrote:
This is very common and your proposed fix is exactly what I do.
Jesse Saint
Saint Aviation, Inc.
jesse(at)saintaviation.com
C: 352-427-0285
F: 815-377-3694
Sent from my iPhone
> On Apr 15, 2017, at 9:15 AM, Kelly McMullen <apilot2(at)gmail.com> wrote:
>
> As I thought I was closing up from my condition inspection, I discovered that the rear cowl support, F-10108A (page 47-11&12) had fractured at the bend where it attaches to the firewall. I'm thinking about using some angle aluminum to replace that bend, at least for now. I'm guessing that the bend when the part was made weakened the aluminum, and the vibration/fiberglass flexing and stress from removal and reinstall of cowling made the failure inevitable. Perhaps the fact that I used quick release fasteners instead of piano hinges may focus more stress on the part. Just wondering if anyone else has had a failure there
> Kelly
> -sent from the I-droid implanted in my forearm
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| | - The Matronics RV10-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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partner14
Joined: 12 Jan 2008
Posts: 540
Location: Granbury Texas
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| Posted: Sat Apr 15, 2017 6:55 am Post subject: F-10108A Support Bracket Fracture |
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Never even installed it on my 10. Looked like the weak link to me. So I made my own. A little wider at the small bend end, and slightly heavier gauge.
Don McDonald
From: Phillip Perry <philperry9(at)gmail.com>
To: rv10-list(at)matronics.com
Sent: Saturday, April 15, 2017 9:29 AM
Subject: Re: F-10108A Support Bracket Fracture
--> RV10-List message posted by: Phillip Perry <philperry9(at)gmail.com (philperry9(at)gmail.com)>
I've noticed that mine will fold up under the cowling if I'm not careful when sliding the lower cowl on. Then it takes some effort to get into out of a bind and into the right position.
It's certainly a bracket prone to eventually failing on my plane at least. If I'm careful it will be fine, but it's hard to be careful when you're wrestling that lower cowling around 3 blades and a nose gear. Practice makes closer to perfect anyway.
Phil
Sent from my iPhone
| Quote: | This is very common and your proposed fix is exactly what I do.
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| Quote: | Saint Aviation, Inc.
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| Quote: | Sent from my iPhone
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| Quote: | > On Apr 15, 2017, at 9:15 AM, Kelly McMullen <apilot2(at)gmail.com (apilot2(at)gmail.com)> wrote:
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| Quote: | > As I thought I was closing up from my condition inspection, I discovered that the rear cowl support, F-10108A (page 47-11&12) had fractured at the bend where it attaches to the firewall. I'm thinking about using some angle aluminum to replace that bend, at least for now. I'm guessing that the bend when the part was made weakened the aluminum, and the vibration/fiberglass flexing and stress from removal and reinstall of cowling made the failure inevitable. Perhaps the fact that I used quick release fasteners instead of piano hinges may focus more stress on the part. Just wondering if anyone else has had a failure there
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| Quote: | > -sent from the I-droid implanted in my forearm
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" target="_blank">http://www.matronics.com/Navigator?RV10-List
http://forums.matronics.com
<= Add some info to the Matronics Email List Wiki!
-Matt Dralle, List Admin.
http://www.matronics.com/contribution
| | - The Matronics RV10-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RV10-List |
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_________________
Don A. McDonald
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carl.froehlich(at)verizon
Guest
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| Posted: Sat Apr 15, 2017 7:36 am Post subject: F-10108A Support Bracket Fracture |
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+1.
And slightly modified for the James Cowl.
Carl
On Apr 15, 2017, at 10:45 AM, Don McDonald <building_partner(at)yahoo.com (building_partner(at)yahoo.com)> wrote:
| Quote: | Never even installed it on my 10. Looked like the weak link to me. So I made my own. A little wider at the small bend end, and slightly heavier gauge.
Don McDonald
From: Phillip Perry <philperry9(at)gmail.com (philperry9(at)gmail.com)>
To: rv10-list(at)matronics.com (rv10-list(at)matronics.com)
Sent: Saturday, April 15, 2017 9:29 AM
Subject: Re: F-10108A Support Bracket Fracture
--> RV10-List message posted by: Phillip Perry <philperry9(at)gmail.com (philperry9(at)gmail.com)>
I've noticed that mine will fold up under the cowling if I'm not careful when sliding the lower cowl on. Then it takes some effort to get into out of a bind and into the right position.
It's certainly a bracket prone to eventually failing on my plane at least. If I'm careful it will be fine, but it's hard to be careful when you're wrestling that lower cowling around 3 blades and a nose gear. Practice makes closer to perfect anyway.
Phil
Sent from my iPhone
| Quote: | This is very common and your proposed fix is exactly what I do.
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| Quote: | Saint Aviation, Inc.
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| Quote: | Sent from my iPhone
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| Quote: | > On Apr 15, 2017, at 9:15 AM, Kelly McMullen <apilot2(at)gmail.com (apilot2(at)gmail.com)> wrote:
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| Quote: | > As I thought I was closing up from my condition inspection, I discovered that the rear cowl support, F-10108A (page 47-11&12) had fractured at the bend where it attaches to the firewall. I'm thinking about using some angle aluminum to replace that bend, at least for now. I'm guessing that the bend when the part was made weakened the aluminum, and the vibration/fiberglass flexing and stress from removal and reinstall of cowling made the failure inevitable. Perhaps the fact that I used quick release fasteners instead of piano hinges may focus more stress on the part. Just wondering if anyone else has had a failure there
|
| Quote: | > -sent from the I-droid implanted in my forearm
|
" target="_blank">http://www.matronics.com/Navigator?RV10-List
http://forums.matronics.com
<= Add some info to the Matronics Email List Wiki!
-Matt Dralle, List Admin.
http://www.matronics.com/contribution
|
| | - The Matronics RV10-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RV10-List |
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Lenny Iszak
Joined: 23 Mar 2008
Posts: 270
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| Posted: Sat Apr 15, 2017 7:58 am Post subject: Re: F-10108A Support Bracket Fracture |
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I had to make a new one, because my James cowl has a slightly taller exit area. Used a bit thicker aluminum and angles on both top and bottom. Much sturdier and so far no signs of issues in 280 hours. Here's a picture.
I also have camlocks on the bottom of the cowl, the floating ones too.
Lenny
| | - The Matronics RV10-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RV10-List |
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Mauledriver(at)nc.rr.com
Guest
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| Posted: Sat Apr 15, 2017 10:33 am Post subject: F-10108A Support Bracket Fracture |
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I copied Tim's solution during the build. No problems at 900hrs other
than a smoking rivet.
On 4/15/2017 9:43 AM, Tim Olson wrote:
| Quote: |
I used screws and plates and mine has never fractured that part. Frankly I surprised of that. Just a data point.
Tim
> On Apr 15, 2017, at 8:15 AM, Kelly McMullen <apilot2(at)gmail.com> wrote:
>
> As I thought I was closing up from my condition inspection, I discovered that the rear cowl support, F-10108A (page 47-11&12) had fractured at the bend where it attaches to the firewall. I'm thinking about using some angle aluminum to replace that bend, at least for now. I'm guessing that the bend when the part was made weakened the aluminum, and the vibration/fiberglass flexing and stress from removal and reinstall of cowling made the failure inevitable. Perhaps the fact that I used quick release fasteners instead of piano hinges may focus more stress on the part. Just wondering if anyone else has had a failure there
> Kelly
> -sent from the I-droid implanted in my forearm
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| | - The Matronics RV10-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RV10-List |
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rvdave
Joined: 24 Jan 2009
Posts: 191
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| Posted: Sun Apr 16, 2017 5:49 am Post subject: Re: F-10108A Support Bracket Fracture |
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| Quote: |
I had to make a new one, because my James cowl has a slightly taller exit area. Used a bit thicker aluminum and angles on both top and bottom. Much sturdier and so far no signs of issues in 280 hours. Here's a picture.
I also have camlocks on the bottom of the cowl, the floating ones too. |
What are the two lines adelled to the bracket?
| | - The Matronics RV10-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RV10-List |
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_________________
Dave Ford
Cadillac, MI |
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Lenny Iszak
Joined: 23 Mar 2008
Posts: 270
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| Posted: Sun Apr 16, 2017 6:13 am Post subject: Re: F-10108A Support Bracket Fracture |
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Fuel pump overflow and FAB drain line.
| rvdave wrote: |
What are the two lines adelled to the bracket? |
| | - The Matronics RV10-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RV10-List |
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