Mailing List flyrotary@lancaironline.net Message #43560
From: <wrjjrs@aol.com>
Subject: Re: [FlyRotary] Re: Safety wire
Date: Mon, 28 Jul 2008 14:23:31 -0400
To: <flyrotary@lancaironline.net>
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Ed what's a couple of degrees between friends? Al suggested he has used metal lock nuts whenever possible. I like this solution. the steel Jet-nuts are fantastic if somewhat expensive. With reguards to weakening bolts by wiring, I will use a technique where I drill through a corner only on low-grade nuts or bolts. This is a little tedious but I've done 30 in an hour when I did them production style. First I spot the bolt with a slightly larger drill, them I drill perpendicular to the cone surface a short distance with a .06 drill. This sounds hard but if you hold the head by the flats it lines up perfectly. Then do the same thing on an adjoining flat. Not as good as the AN through drilled bolt, but easy to do. Works on nuts too! I've done this on exhaust nuts on a problem engine I had. Not the only solution, and sometimes overkill. The biggest advantage of having bolts drilled for wire is that you will usually tighten them before wiring them! This is the reason racers use a lot of wire. the wire is a great reminder when replacing parts. If I have anything on my plane that I find I'm removing and replacing a lot it WILL be safety wired. Most items DON'T NEED safety wire, if you remember to tighten them.
Bill Jepson


-----Original Message-----
From: Ed Anderson <eanderson@carolina.rr.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Mon, 28 Jul 2008 9:46 am
Subject: [FlyRotary] Re: Safety wire

That’s impressive, Bill. I don’t think (as Lynn said) and aircraft ever came out of the sky because of safety wire – but plenty have because lack of it.  However, some bolts and such on the rotary, you would need to drill the heads/nuts yourself – in that case, I’m think I would look to other alternatives as drilling a bolt head or threaded part could weaken it. Fortunately, the vibration level is lot lower on the rotary compared to most reciprocating engines.
 
By the way,   I’ll bet you even wire the 37 deg AN fittings as well {:>)
 
Ed
 
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of wrjjrs@aol.com
Sent: Monday, July 28, 2008 12:21 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Safety wire
 
Keith,
there will be many divergent opinions on this I'm sure. My personal mantra is safety wire anything you don't want to fall off! There are several approaches too. I am an ex motorcycle racer and the rules required all basic safety items to be wired. Those were, all oil drains, water drain plugs if any, brake mount bolts, and oil feed bolts and filters. I would usually do more than was required. I have seen many things vibrate off that you wouldn't think possible when operating at high power levels. I would use both .039 and .025 stainless steel safety wire. The .025 isn't FAA approved on a lot of things, but it's light and serves the purpose. I even wired 39°AN fittings, which isn't required.
Bill Jepson


-----Original Message-----
From: ktradcliff@comcast.net< /A>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Sun, 27 Jul 2008 5:07 pm
Subject: [FlyRotary] Safety wire
Hello everyone,
 
I know that the subject of safety wire has been discussed many times before,  
however searching the archives can at times be very difficult and actually 
finding the answer you want is like winning the lottery (it never happens).  
What I would like to know is what most are considering an absolute must to be 
safety wired.  What the FAA r
equires and what is not so important but some are 
doing anyway.  I feel that the subject of safety can never be discussed enough.  
I would like everyone that has an opinion on safety wire and what must be safety 
wired to weigh in on this subject.  I plan to save some if not all of your 
answers for future reference.  Maybe we can make a list of what must be safety 
wired.
 
Thanks
Keith
RV-7A
13-B 
 
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