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07-01-2019, 05:53 AM
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Join Date: Apr 2011
Location: Cincinnati, OH
Posts: 2,788
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flap actuator bolt
I've had my flap actuator off several times from motor cleaning. I thought I tightened everything up after each time but I found this. I couldn't turn the nut by grip strength so it made me wonder if it was something else. Has anyone else found this. Does this bolt need to have a cotter pin? The plans call for no cotter pin.
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Steve Melton
Cincinnati, OH
RV-9A, Tip-up, Superior O-320, roller lifters, 160HP, WW 200RV, dual impulse slick mags, oil pressure = 65 psi, EGT = 1300F, flight hours = 800+ for all
Simplicity is the art in design.
My Artwork is freely given and published and cannot be patented.
www.rvplasticparts.com
Last edited by Steve Melton : 07-01-2019 at 05:56 AM.
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07-01-2019, 06:18 AM
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Join Date: Aug 2005
Location: Dallas/Ft Worth, TX
Posts: 5,666
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This is a typical rod end connection, with the appropriate spacers installed, and the bolt properly torqued, there are no rotational forces on the bolt hence no cotter key required (the same as all the other rod end connection on the controls).
I often find folks don't install spacers between the bearings and the fork and then leave the bolt loose, it this case there will be a rottional force on the bolt which could loosen it over time. In this case the bolt becomes the 'bearing' and rod end bearing acts like a bushing.
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Walt Aronow, DFW, TX (52F)
EXP Aircraft Services LLC
Specializing in RV Condition Inspections, Maintenance, Avionics Upgrades
Dynamic Prop Balancing, Pitot-Static Altmeter/Transponder Certification
FAA Certified Repair Station, AP/IA/FCC GROL, EAA Technical Counselor
Authorized Garmin G3X Dealer/Installer
RV7A built 2004, 1700+ hrs, New Titan IO-370, Bendix Mags
Website: ExpAircraft.com, Email: walt@expaircraft.com, Cell: 972-746-5154
Last edited by Walt : 07-01-2019 at 06:28 AM.
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07-01-2019, 10:05 AM
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Join Date: Apr 2011
Location: Cincinnati, OH
Posts: 2,788
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Quote:
Originally Posted by Walt
This is a typical rod end connection, with the appropriate spacers installed, and the bolt properly torqued, there are no rotational forces on the bolt hence no cotter key required (the same as all the other rod end connection on the controls).
I often find folks don't install spacers between the bearings and the fork and then leave the bolt loose, it this case there will be a rottional force on the bolt which could loosen it over time. In this case the bolt becomes the 'bearing' and rod end bearing acts like a bushing.
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to your point, I don't recall any spacers or washers coming out when the bolt was removed. agree, spacers are needed to develop clamp on the rod end connection. no cotter pin needed. it bugs me that I missed this. maybe I became LAZY after so many motor cleaning efforts. will correct.
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Steve Melton
Cincinnati, OH
RV-9A, Tip-up, Superior O-320, roller lifters, 160HP, WW 200RV, dual impulse slick mags, oil pressure = 65 psi, EGT = 1300F, flight hours = 800+ for all
Simplicity is the art in design.
My Artwork is freely given and published and cannot be patented.
www.rvplasticparts.com
Last edited by Steve Melton : 07-01-2019 at 10:13 AM.
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