dave.saylor.aircrafters(a
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 Posted: Wed Nov 13, 2013 2:50 pm Post subject: RV-7 loss -> tail inspections -> spar cracks and loose jam |
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Tim,
I've had a reminder about this on my desk for a few weeks now. I finally got around to checking my rudder and found the center hinge jam nut loose. All the others, rudder and elevator, were tight. I'll pay closer attention on preflight now. Thanks for the heads up.
Dave Saylor
831-750-0284 CL
On Sun, Oct 6, 2013 at 7:30 AM, Tim Lewis <TimRVator(at)comcast.net (TimRVator(at)comcast.net)> wrote:
[quote] --> RV10-List message posted by: Tim Lewis <TimRVator(at)comcast.net (TimRVator(at)comcast.net)>
A thread at VAF discusses the results of empenage inspections after the recent loss of an RV-7. (http://www.vansairforce.com/community/showthread.php?t=104551) A couple of spar cracks were found, as were several instances of loose jam nuts on rudder/elevator rod end bearings.
Those rod end bearings form the hinge pivot for our elevators and rudders. My understanding: If the jam nut is tight, the spar is held in compression between the rod end bearing's plate nut and jam nut. If the jam nut comes loose, the loads from the rod end bearing transfer to the rudder/elevator spar only through the rivets holding the platenuts to the spar. Not so good.
Prompted by this thread, I inspected my RV-10 tail structure. No spar cracks found. But I found that the top rudder rod end bearing jam nut (page 11-7, similar to plans page 11-2) was loose. The torque seal on this nut was (obviously) broken.
Tim
-- Tim Lewis -- HEF (Manassas, VA)
RV-6A N47TD -- 1104 hrs - sold
RV-10 N31TD -- 400 hrs
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