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Thread: 51% rule

  1. #11
    Stephen's Avatar
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    Default Re: 51% rule

    I assume assembly counts towards the 51% rule but, how is it credited? If I fabricate a wing out of used or new piper parts and rearranged the wing components so it is significantly different from the original wing how would this wing construction be counted? Assembly or manufacture?
    "You can only tie the record for flying low."

  2. #12
    KSG's Avatar
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    Default Re: 51% rule

    Quote Originally Posted by Stephen View Post
    I assume assembly counts towards the 51% rule but, how is it credited? If I fabricate a wing out of used or new piper parts and rearranged the wing components so it is significantly different from the original wing how would this wing construction be counted? Assembly or manufacture?
    That's the grey area as I see it. Many kits have wing components supplied with the kit and builder puts them together to manufacture the wing. So why not as you mentioned manufacture the wing with the components in a different position. Would you have to build a wing using aftermarket components, would you have to fabricate all the components. Then to determine % comes in.

  3. #13

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    Default Re: 51% rule

    Quote Originally Posted by KSG View Post
    That's the grey area as I see it. Many kits have wing components supplied with the kit and builder puts them together to manufacture the wing. So why not as you mentioned manufacture the wing with the components in a different position. Would you have to build a wing using aftermarket components, would you have to fabricate all the components. Then to determine % comes in.
    That is why you use the checklist. One of the issues that I’ve seen is if the parts (major assemblies) flew on something that had an Airworthiness certificate before, you can’t take credit. Individual piece parts making up the assembly can be credited for the assembly, but not the fabrication. Use this guide when filling out the checklist
    https://www.faa.gov/aircraft/gen_av/...st_Job_Aid.pdf



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  4. #14
    Southern Aero's Avatar
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    Default Re: 51% rule

    [QUOTE=dgapilot;108630]That is why you use the checklist. One of the issues that I’ve seen is if the parts (major assemblies) flew on something that had an Airworthiness certificate before, you can’t take credit. Individual piece parts making up the assembly can be credited for the assembly, but not the fabrication. Use this guide when filling out the checklist
    https://www.faa.gov/aircraft/gen_av/ultralights/amateur_built/kits/media/Am_Blt_Chklist_Job_Aid.pdf

    Doesn't really address the more complex nature of the tube and rag fuselage now does it?? ............ Back on the issue of using a part that has previously been on a certificated aircraft ............... You cant use a front section salvaged from a damaged Pacer and lengthen it but you can buy a manufactured fuselage if you find one to suit and lengthen it. You're golden ........ You can't use a salvaged spar from a PA12 but you can order one from Wag, Dakota or other suppliers! That definitely falls into the stupid column. I have a lot of heartburn with this interpretation/ruling. ............. Again, needs to be addressed and not left just as is............ but maybe there are just not unuff folks that are troubled by this issue to matter............
    Last edited by Southern Aero; 04-09-2018 at 02:31 PM.

  5. #15
    Administrator Steve Pierce's Avatar
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    Default Re: 51% rule

    End of day if I were going to build an experimental scratch build using some off the shelf components I would first meet with the DAR, get a plan, use the checklist and ducument the build thoroughly.

  6. #16
    Jim Hann's Avatar
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    Default Re: 51% rule

    Quote Originally Posted by dgapilot View Post
    And I know of one airplane that was issued an E-AB certificate, and a year or two later, FAA took it away. Then issued an Experimental Exhibition to that Aircraft. It also involved switching data plates. It started life as a Monocoupe 90A, and ended up as a Monocoupe 110 Special. Unfortunatly the owner and a good friend was killed in it several years ago.


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    Similar issue to this one, anybody remember the egg on the face apology from EAA about it?



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    1957 PA-22/20 "Super Pacer" based 1H0
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  7. #17

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    Default Re: 51% rule

    A while back I encountered a Wagabond that someone had "built". It looked to me more like a Colt than a Vag so maybe the key is not confess to anything.

  8. #18
    Frank Green's Avatar
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    Default Re: 51% rule

    As I understand it, it is the # of items you work on, not the # of hours you spend doing it and that is how many bend the rules and have the build it in a week business.
    -Super Stub-

  9. #19
    Rick-CAS's Avatar
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    Default Re: 51% rule

    I remember the SeaBee article. There was a whole lot to that project that put the rules to the test. I know later on the Corvette engine was approved under a STC that he developed along with a Canadian partner. It was approved in Canada first then thrown to the FAA as a bilateral agreement for use down here. Last I herd he was looking for a Standard Category certificate just to prove you could do it.

  10. #20

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    Default Re: 51% rule

    All depends how deep you get into the project, say a stretch pacer, exp of corse, if its taken apart COMPLETLEY, meaning down to bare, all wings disassembled, mods made and built back up, YES it certainly does meet the 51percent rule, i done it, recently. get a DAR who cares and no issues. if you build one like this its certainly more work than a kit build that is pre-fab . building one right from ground up with major mods is not any easier than a kit, actually probably more work.

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