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Scott-
While close tolerance bolts
are not really justified for most applications, they are for the
landing gear. It's nice to slip one in place and feel the difference!
There's almost no free-play in my
ailerons and elevator, but I intend to try them in the
flap system.
The current spec is NAS 6203 thru 6220,
where the last two digits represent the bolt diameter in 1/16 th's. I purchased
mine from Genuine Aircraft Hardware about five years ago and don't believe
I spent more than $100. to replace the bolts listed below; however, I just
checked current prices and they're about double what I recall, so
carefully determine your required length before ordering (the NAS 6205-42 for
the lower gear leg's are currently $ 22.27 each). The larger diameter ones are
available individually, but smaller ones are only available in
packages of 5, 10 or 25.
Bill Rumburg
N403WR (Sonic bOOm)
Bill,
Great information. Considering the number of linkages in the
elevator and aileron push rod systems, perhaps such bolts would reduce the
lash there also.
Grayhawk
Since building my 320, I'd noticed
the free-play in the main gear while on the jackstand. Not an
excessive amount, but enough to bother me. Most of it
originated at the lower gear leg attachment, but there was also some at
the overcenter link attachment to the gear leg. I decided to see
if that free-play would be appreciably reduced by the use of close
tolerance bolts - it was. They eliminated about 80% of the free-play at
each lower gear leg attachment and almost 100% at the overcenter link
attachment (there was also a slight amount in the rod end bearing itself. I
wasn't impressed with the quality of the one supplied with the kit and
replaced it with a Heim HME-6 which had virtually no free-play).
I also installed close
tolerance bolts at the upper and lower shock attachments and at
the overcenter link pivot.
I had almost no free play at the
nose gear overcenter link attachment, but installed a close tolerance bolt
there also and it only improved the condition.
Aircraft Spruce does not stock many
close tolerance bolts, I purchased mine from Genuine Aircraft Hardware,
which has all sizes and lengths. I think they are a great thing and might
install them throughout the airframe in the future.
Bill Rumburg
N403WR (Sonic bOOm)
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