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  #1  
Old 04-13-2021, 11:12 PM
Taltruda Taltruda is offline
 
Join Date: Oct 2017
Location: Las Vegas, NV
Posts: 669
Default RV-9 rear wing spar bolt

Iím doing a condition inspection on a RV-9a, and the rear spar bolts are metal lock nuts, not castellated cottered nuts and bolts. Is this normal for the -9? Or is the -9 wing rear spar bolts just like the other RVs? Can anybody post a pic of the DWG showing this detail? Thanks!
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  #2  
Old 04-14-2021, 04:29 AM
Future RV 9 Flyer Future RV 9 Flyer is offline
 
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Location: Marathon,WI
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Default Rear spar attach bolt

Tom, the plans call for a an5-10 bolt,3 an960-516 washers ,an310-5 nut and a ms24665-208 cotter pin.Castellated nut,not a all metal lock nut.
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  #3  
Old 04-14-2021, 06:48 AM
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airguy airguy is offline
 
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Location: Garden City, Tx
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Unless they changed accepted fastener types somewhere along the way, it should be castellated with a cotter pin. See top right corner of Drawing 38, 2009 vintage.
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Greg Niehues - SEL, IFR, Repairman Cert.
Garden City, TX VAF 2021 dues paid
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Built an off-plan RV9A with too much fuel and too much HP. Should drop dead any minute now.
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  #4  
Old 04-14-2021, 07:22 AM
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Mel Mel is offline
 
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Location: Dallas area
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It should be a castellated nut. This bolt is subject to rotation, even though it is very minimal.
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Mel Asberry, DAR since the last century. Over 1,000 certifications accomplished.
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<rvmel(at)icloud.com>
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  #5  
Old 04-14-2021, 08:47 AM
Sportquattro Sportquattro is offline
 
Join Date: Nov 2020
Location: Ivybridge UK
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Quote:
Originally Posted by Future RV 9 Flyer View Post
Tom, the plans call for a an5-10 bolt,3 an960-516 washers ,an310-5 nut and a ms24665-208 cotter pin. Castellated nut, not a all metal lock nut.
Probably a silly question but as I'm at that stage in my build now I thought good time to ask it. Why three washers? Where do the washers go in the bolt, spar, bracket, castellated nut sequence? I would have expected a washer to go under the castellated nut, but three washers has me puzzled.

Thanks in advance

Nige

Last edited by Sportquattro : 04-14-2021 at 08:47 AM. Reason: Lousy typing
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  #6  
Old 04-14-2021, 09:39 AM
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Raymo Raymo is offline
 
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Quote:
Originally Posted by Sportquattro View Post
Why three washers?
Likely to ensure there is shank plenty to spare. You don't want the threaded portion to handle any shear load.
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  #7  
Old 04-14-2021, 12:54 PM
Taltruda Taltruda is offline
 
Join Date: Oct 2017
Location: Las Vegas, NV
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Thanks all for the response! I was pretty sure the rear spar bolt was supposed to be castellated with a cotter key, but just wanted to check if the -9 was different. This builder did such a beautiful job, I was doubting that he deviated off plans, but I guess he slipped on this! Plane has been flying since 2001, itís nice to catch little things like this and make it right.
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