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  #1  
Old 12-13-2017, 09:54 AM
dromuald's Avatar
dromuald dromuald is offline
 
Join Date: Aug 2012
Location: Madison, WI
Posts: 25
Default Flap linkage bolt

I thought I would share this discovery since I appreciate other posts when members share important issues. I was performing my annual condition inspection with my local A&P. I decided to pull the interior side panels of my RV-8 to inspect the flap linkage. I had recently made the mistake of taking off with full flaps and although I was confident I didn't overspeed the flaps I thought it would be worth a look. To my surprise I found that the nut on the bolt which connects the flap motor to the linkage almost completely backed off. Although it has a nylon insert this nut could be turned with my fingers.

I have owned the a/c for five years (not the builder) and regret that this was never checked on my previous condition inspections. I can't vouch for whether or not the nut was installed properly but I do see some evidence that a wrench was used on the nut prior to this photo.

Although I have no idea as to why this nut came loose I thought it would be something of interest to this forum.http://s899.photobucket.com/user/dro...tml?sort=3&o=0
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  #2  
Old 12-13-2017, 10:18 AM
vic syracuse vic syracuse is offline
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Default

Good catch. I doubt it came loose. I have seen more than one nut on an airplane that was never tightened.

Vic
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  #3  
Old 12-13-2017, 11:24 AM
NYTOM NYTOM is offline
 
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Location: Raleigh, North Carolina
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Default Probably missed torquing in construction.

I agree with Vic on this one since I just completed my own flap installation. If the bearing is properly installed, the bolt should never have the opportunity to turn at all if torqued to specs.
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  #4  
Old 12-13-2017, 11:24 AM
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Mel Mel is offline
 
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Location: Dallas area
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Quote:
Originally Posted by vic syracuse View Post
Good catch. I doubt it came loose. I have seen more than one nut on an airplane that was never tightened.
Vic
My self! What bothers me is that lately I've been finding loose nuts with torque seal on NEW aircraft.
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  #5  
Old 12-13-2017, 04:40 PM
vic syracuse vic syracuse is offline
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Quote:
Originally Posted by Mel View Post
My self! What bothers me is that lately I've been finding loose nuts with torque seal on NEW aircraft.
That's mind-boggling. I don't think someone understands the objective of using torque seal!

Vic
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  #6  
Old 12-13-2017, 05:10 PM
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chrispratt chrispratt is offline
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Quote:
Originally Posted by vic syracuse View Post
That's mind-boggling. I don't think someone understands the objective of using torque seal!

Vic
Oh that's an easy one, Vic. You put the torque seal on, and overnight the bolt torques itself to the proper value.

Chris
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  #7  
Old 12-13-2017, 05:49 PM
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Alan Carroll Alan Carroll is offline
 
Join Date: Jul 2007
Location: Madison, Wisconsin
Posts: 732
Default

Quote:
Originally Posted by dromuald View Post
I thought I would share this discovery since I appreciate other posts when members share important issues. I was performing my annual condition inspection with my local A&P. I decided to pull the interior side panels of my RV-8 to inspect the flap linkage. I had recently made the mistake of taking off with full flaps and although I was confident I didn't overspeed the flaps I thought it would be worth a look. To my surprise I found that the nut on the bolt which connects the flap motor to the linkage almost completely backed off. Although it has a nylon insert this nut could be turned with my fingers.

I have owned the a/c for five years (not the builder) and regret that this was never checked on my previous condition inspections. I can't vouch for whether or not the nut was installed properly but I do see some evidence that a wrench was used on the nut prior to this photo.

Although I have no idea as to why this nut came loose I thought it would be something of interest to this forum.http://s899.photobucket.com/user/dro...tml?sort=3&o=0
Hi Dave,

Glad this didn't end up causing trouble. I need to check my plans but I'm pretty sure this bolt should have a castle nut and cotter pin rather than a nylock.
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  #8  
Old 12-13-2017, 07:10 PM
RVTOY RVTOY is offline
 
Join Date: Oct 2012
Location: Corona , Ca
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Default

Originally Posted by vic syracuse View Post
Good catch. I doubt it came loose. I have seen more than one nut on an airplane that was never tightened.
Vic

Vic, we talking about nuts and bolts or the pilot/mechanic never tightened up properly.
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  #9  
Old 12-13-2017, 07:23 PM
NYTOM NYTOM is offline
 
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Location: Raleigh, North Carolina
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Default

Quote:
Originally Posted by Alan Carroll View Post
Hi Dave,

Glad this didn't end up causing trouble. I need to check my plans but I'm pretty sure this bolt should have a castle nut and cotter pin rather than a nylock.
Castle nuts and cotter pins I believe are only used on bolts that will normally rotate. The rotation on the flap bearing should only be in the bearing.
Mel?
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  #10  
Old 12-13-2017, 07:27 PM
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Jeff A Jeff A is offline
 
Join Date: Feb 2007
Location: Dallas, TX
Posts: 320
Default It should have a cotter pin.



The plans specifically call out:

AN4-11 Bolt
AN960-416 Washer
AN310-4 Nut
MS24665-208 Cotter Pin

I just replaced these the other week.
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Last edited by Jeff A : 12-13-2017 at 07:36 PM. Reason: Added picture
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