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02-27-2013, 10:37 AM
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Join Date: Dec 2007
Location: St. Louis, MO
Posts: 151
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Frangible bolt-00002 Description
Good Afternoon,
I can't seem to locate these two bolts for the installation of the fuel tank...getting close to the end!
I would appreciate if someone could provide the length and any markings on the head of the bolt. I believe the new bolts replaced AN3-7A.
Thanks,
__________________
Tom
RV-10 - Purchased & flying
Magni M24 Gyroplane - Built - Sold
Magni M16 - Built & Flying - Sold
Magni M24 (Rotax 915) - Built & Flying
RV-12 - Built - Sold
Rotorway 162F Built - Sold
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02-27-2013, 10:43 AM
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Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 9,035
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Quote:
Originally Posted by Tom Delaney
Good Afternoon,
I can't seem to locate these two bolts for the installation of the fuel tank...getting close to the end!
I would appreciate if someone could provide the length and any markings on the head of the bolt. I believe the new bolts replaced AN3-7A.
Thanks,
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It is an AN3-7A bolt with a hole drilled in the center of the head.
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02-27-2013, 11:47 AM
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Join Date: Dec 2007
Location: St. Louis, MO
Posts: 151
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Thanks again Scott!
__________________
Tom
RV-10 - Purchased & flying
Magni M24 Gyroplane - Built - Sold
Magni M16 - Built & Flying - Sold
Magni M24 (Rotax 915) - Built & Flying
RV-12 - Built - Sold
Rotorway 162F Built - Sold
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02-27-2013, 11:55 AM
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Join Date: Oct 2010
Location: La Feria Texas
Posts: 3,822
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You might look for them at the tank, I screwed mine into their threaded holes on the tank to avoid just what you are experiencing.
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02-27-2013, 05:45 PM
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Join Date: Aug 2010
Location: Marshall TX (KASL)
Posts: 1,783
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Paint them red when you find them
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02-27-2013, 06:13 PM
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Join Date: Oct 2010
Location: La Feria Texas
Posts: 3,822
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I actually put them there for another good reason. Sure did not want to accidentally put them in a place of a regular bolt. I am old, don't see too good anymore!
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02-27-2013, 10:17 PM
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Join Date: Dec 2007
Location: St. Louis, MO
Posts: 151
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Found them!
Thanks guys. First place I looked was the tank but not there. The description from Scott had them in hand in short order. The quick response here kept my down time to less than ten minutes.
I almost hate to ask this but how easy would it be to break off the head of the bolt while placing it? I am thinking of the resistance of the nut plate threads and not using a torque wrench in this situation leading to over torquing. At least I don't recall reading anything stating a torque wrench is used here. The landing gear mod gave me a good experience in the application of prevailing torque so I understand that.
__________________
Tom
RV-10 - Purchased & flying
Magni M24 Gyroplane - Built - Sold
Magni M16 - Built & Flying - Sold
Magni M24 (Rotax 915) - Built & Flying
RV-12 - Built - Sold
Rotorway 162F Built - Sold
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02-27-2013, 10:32 PM
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Join Date: Mar 2009
Location: Austin, Texas
Posts: 306
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Torque them normally
Quote:
Originally Posted by Tom Delaney
Thanks guys. First place I looked was the tank but not there. The description from Scott had them in hand in short order. The quick response here kept my down time to less than ten minutes.
I almost hate to ask this but how easy would it be to break off the head of the bolt while placing it? I am thinking of the resistance of the nut plate threads and not using a torque wrench in this situation leading to over torquing. At least I don't recall reading anything stating a torque wrench is used here. The landing gear mod gave me a good experience in the application of prevailing torque so I understand that.
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I believe the instructions say to torque them the same as a normal un-frangible-ized bolt
__________________
Rob Reese
RV-12 #120332 N73HR
Austin, TX
TangoFlight Mentor
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02-28-2013, 07:31 AM
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Join Date: Dec 2012
Location: Pentwater, MI
Posts: 17
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Hole doesn't affect torque.
A hole in the middle of the bolt head will only minimally affect the bolt's ability to accept torque - but it will affect it's shear strength! (Which, I suspect, is the idea).
Torque is taken by the outer edge of the bolt - think about a drive shaft on a car, it is a tube because it will take torque just as well as a solid shaft - and is actually called a "torque tube"!
Last edited by Limey : 02-28-2013 at 02:02 PM.
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02-28-2013, 12:25 PM
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Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 9,035
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Quote:
Originally Posted by Tom Delaney
I almost hate to ask this but how easy would it be to break off the head of the bolt while placing it? I am thinking of the resistance of the nut plate threads and not using a torque wrench in this situation leading to over torquing. At least I don't recall reading anything stating a torque wrench is used here. The landing gear mod gave me a good experience in the application of prevailing torque so I understand that.
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Determin the prevailing torque of the nutplate, add the standard torque value of an AN3 bolt to that, and then torque with a torque wrench. As long as you dont exceed that value, there should be no danger of twisting off the bolt head.
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