rickofudall
Joined: 19 Sep 2009
Posts: 1392
Location: Udall, KS, USA
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 Posted: Thu Sep 30, 2010 6:51 pm Post subject: Rod end security |
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John, I did some more digging in FAA publication AC 65-15A "Airframe & Powerplant Mechanics Airframe Handbook" that might explain why you didn't see any restraints to keep rod end bearings from coming loose and departing the housing. On page 68, figure 2-61 is a cutaway view of rod end housing that has a large flange on the bell crank side. The text accompanying the drawing says, " It is possible for control rods with bearings to become disconnected because of failure of the peening that retains the ball races in the rod end. This can be avoided by installing control rods so that the flange of the rod end is interposed between the rod end and anchored end of the attaching pin or bolt as shown in figure 2-60. Another alternative is to place a washer, having a diameter larger than the hole in the flange, under the retaining nut on the end of the attaching pin or bolt." I was able to cut the drawing from the page but the text caption didn't come out the best in the transition to a jpg file.
I'm no helicopter mechanic, but that might explain why you didn't see large area washers being used to safety the rod ends on helicopter controls. That same capability was built into the rod end housing instead.
Rick
--
Zulu Delta
Kolb Mk IIIC
582 Gray head
4.00 C gearbox
3 blade WD
Thanks, Homer GBYM
It is not bigotry to be certain we are right; but it is bigotry to be unable to imagine how we might possibly have gone wrong.
- G.K. Chesterton
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