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fastener installation
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Posted by: as01491

04/21/2004, 14:44:45

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As a start-up aerospace company, we need to generate fastener installation processes for both threaded and non-threaded fasteners. Are there generic processes available on the internet as a starting point?  Other than for standard rivets, I've had little success.






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Re: aircraft fasteners
Re: fastener installation -- as01491 Post Reply Top of thread Forum
Posted by: RandyKimball
Barney
04/21/2004, 18:48:43

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... then, the aircraft you are involved with will have a specified spec. to use. You need to go through your buyer and have the spec furnished per your use. This is standard proceedure. This way you will be using the spec. they require. They may just provide the number of the spec, but if it is a military aircraft it is very likely that it has its own spec. set and they will provide it to you or to the vendor you are sub-letting from. If it is a miltary aircraft you MUST use the spec. they spec. It should be (supposed to be) called out on the data sheet provided with the blue print. It should be (required to be) also called out on your required in house travelers, and the spec. must be provided to the persons doing the fastening for reading, and to your inspection department for first part, sample and final inspections as required in vendor and procesing requirements. These are REQUIRED steps under every defense contractor I ever worked with!
-randy-



The worst suggestion of you lifetime may be the catalyst to the grandest idea of the century, never let suggestions go unsaid nor fail to listen to them.

Modified by RandyKimball at Wed, Apr 21, 2004, 21:56:49

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Re: aircraft fasteners
Re: Re: aircraft fasteners -- RandyKimball Post Reply Top of thread Forum
Posted by: Cragyon
Bart
04/23/2004, 07:33:56

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In general, for each fastener type, there will be a torque specification and a locking feature. Sometimes, depending on application, a corrosion inhibitor, such as Zinc Chomate (if this primer is still approved by MIL or FAA) will be applied to the threads. The locking feature for a fastener could be one of the following:

Safety Wire (Lock Wire)
Flex Nut
Castle nut with cotter pin lock
Self locking threads
etc...

I don't believe pipe threads are acceptable on aircraft.

Proper torque and stress design is always an issue on aircraft, so each fastener installation will require analysis for loading and torque relevant to installation. Static, fatique, thermo, etc...

Other notes I remember;

Fasteners are never used twice, once they have been installed, they are discarded as opposed to reused on the aircraft following maintenance or repair.

Aircraft fasteners are not interchangable with commercial fasteners. You have to use NAS or AN or MIL spec. fasteners in your design. (Unless this has been changed other the years).

For each fastener you use, there will be engineering data avaiable within the specification. So, you need either spend some (alot) of money or as randy suggested, contact the vendor. They will probably have this info readily available.

Good luck!






Modified by Cragyon at Fri, Apr 23, 2004, 07:38:00

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Re: aircraft fasteners
Re: Re: aircraft fasteners -- Cragyon Post Reply Top of thread Forum
Posted by: RandyKimball
Barney
04/23/2004, 20:36:33

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Also, on any military aircraft made for American military final customers you will have to provide the certs to the fasteners... or keep them on file and provide proof of certification to aircraft specs. This is the key difference in commercial fasteners and military aircraft and even FAA aircraft fasteners, the price of the certs and the tracabality back to the very heat lot of the material and even the mines the elements came from.



The worst suggestion of you lifetime may be the catalyst to the grandest idea of the century, never let suggestions go unsaid nor fail to listen to them.


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Re: fastener installation
Re: fastener installation -- as01491 Post Reply Top of thread Forum
Posted by: Cragyon
Bart
04/21/2004, 16:49:52

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There is a Federal Avaition Administration (FAA) document number 43.13.1A which, is used by avaition mechanics as a general assembly and maintenance guide.  I doubt that the document is free.






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Re: fastener installation
Re: Re: fastener installation -- Cragyon Post Reply Top of thread Forum
Posted by: as01491

04/21/2004, 17:03:26

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Thanks - I'm familiar with that document, and we have it, but unfortunately we're dealing with military aircraft for which the document itself probably isn't appropriate.  That's a good source for ideas, though. Thanks






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