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jesse(at)saintaviation.co
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 Posted: Fri Sep 09, 2011 6:02 am Post subject: Horizontal Stabilizer bolts loose at annual |
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This is correct. On the flap hinges where there is no bearing they use castle nuts, but anywhere there is an actual bearing (rudder, elevator, ailerons, bell cranks, etc.) they just use the bolt to hold things together, but all pivoting takes place on the bearing itself. Only where the bolt itself may rotate do you need to use a castle nut, or where there is a heat source (engine compartment) that could melt the nylon.
Jesse Saint
Saint Aviation, Inc.
jesse(at)saintaviation.com (jesse(at)saintaviation.com)
C: 352-427-0285
F: 815-377-3694
On Sep 8, 2011, at 3:49 PM, carl.froehlich(at)verizon.net (carl.froehlich(at)verizon.net) wrote:
[quote]The bolt and nut captures the hinge bearing. The hinge bearing rotates. There is no relative motion between the bolt/nut and the bearing ball.
Using a castle nut would yield the bolt becoming the bearing as you would most likely not have it tight enough to capture the bearing ball. Not recommended.
Carl
Sent from my phone. Please read pass the typos.
-----Original message-----
| Quote: | From: Jack Phillips <pietflyr(at)bellsouth.net (pietflyr(at)bellsouth.net)>
To: rv10-list(at)matronics.com (rv10-list(at)matronics.com)
Sent: Thu, Sep 8, 2011 19:16:02 GMT+00:00
Subject: RE: Re: Horizontal Stabilizer bolts loose at annual
One thing Van’s does that I just don’t agree with is their use of locknuts on rotating assemblies (like aileron hinges). AC 43.13 most definitely requires castle nuts and cotter pins in such locations. Locknuts can and will loosen if rotated enough.
Jack Philliips
#40610
Raleigh, NC
From: owner-rv10-list-server(at)matronics.com (owner-rv10-list-server(at)matronics.com) [mailto:owner-rv10-list-server(at)matronics.com] On Behalf Of Danny Riggs
Sent: Thursday, September 08, 2011 11:53 AM
To: rv10-list(at)matronics.com (rv10-list(at)matronics.com)
Subject: RE: Re: Horizontal Stabilizer bolts loose at annual
Soooo,
What is the theory about substituting castle nuts and locking pins? Any good reason not to do so on these critical areas????> Date: Thu, 8 Sep 2011 10:40:25 -0500
| Quote: | From: Tim(at)myrv10.com (Tim(at)myrv10.com)
To: rv10-list(at)matronics.com (rv10-list(at)matronics.com)
Subject: Re: Re: Horizontal Stabilizer bolts loose at annual
--> RV10-List message posted by: Tim Olson <Tim(at)myrv10.com (Tim(at)myrv10.com)>
Big mistake. If you do that, and the nuts loosen, it'll fall
right out. That's why all bolts are IN, DOWN, AFT on their
direction.
Tim Olson - RV-10 N104CD
do not archive
On 9/8/2011 10:13 AM, AirMike wrote:
> --> RV10-List message posted by: "AirMike"<Mikeabel(at)Pacbell.net (Mikeabel(at)Pacbell.net)>
>
> I suspect that:
> 1. Vibration loosened the nuts. Or
> 2. Vans has you install the bolts - top down with the nuts on the underside.
> Thinking about it now, this might be wrong. I obviously torqued the assembly from the top. Not the best way to do it. You do not get an accurate torque value. If I were building again -bolts bottom-up. That way you can torque the nuts precisely.
> 3. Some combination of inaccurate torque and vibration.
>
> --------
> See you OSH '11
> Q/B - flying 1 yr+
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=351733#351733
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