[rebel-builders] safety wire

[Dick Wampach]

Two types of wire are in use for general aviation safety wiring, in 3
diameters.
MS20995C- & MS20995N- and are available in 3 sizes
.020", .032" (.031, .030 depending on vender source), .041" diameter.

Mostly the C (Cress) is for cold installations, (all over the
airframe), the N (Incinell) is for hot installations such as on Exhaust
components and Turbine engines.

.020" Wire is used a lot on things like cannon plugs, very small screws,
electrical gadgets, and if the hole is so small that .031 won't go in...then
use it.
.032" Is most common on every thing else, if the holes are big enough use
it!. At the rocket factory I used a one pound roll of N-32 every month and
a roll of C-32 every two months to build Titan Liquid engines.
.041" Is used on the Propeller and occasionally other places when it is
called out specifically.
.047" Is not normally found on our type equipment. I did manage to use
about a half roll in 18 years at the rocket factory.

On the Prop. A few things you may want to know about. In our area just
about the first thing an Inspector looks at is the quality of the job and
wire size (.041). IF HE DOES NOT LIKE IT the rest of the inspection can go
real poorly (some think of but-head). On the other hand if he likes that
Prop installation, he will probably like the rest of the plane, and it
passes easily. Now I know what you are thinking when you have an inspection
done you want all the stuff that can hurt you found (Me Too), BUT in this
case have a few of your knowledgeable friends, A/P, IA, EAA Technical
Counselor do the nit-picking for you. Let the DAR Look it over with no big
items to find...you will be a lot happier in the end.

A fixed pitch prop is relatively easy to safety. Just do the six bolts in
pairs after torqueing in proper sequence, just be sure the have the wire
pulling the bolts tight and have the wire snug, not flopping loose.

On a LYC with a constant speed prop...I find it still takes me an hour or
more to torque up and safety the six studs, and I think bad things about
that darn---.041". The trick is to bring all the nuts to full torque (in
the 50 ft/lb range), then back off one at a time as needed to feed the wire
through the roll pin so that when your re-torque it the wire pulls in the
right direction. BUT just think of the inconvenience you could put
your self into if that wire job failed you and the bolts or studs came
out!!!


Dick Wampach A/P, IA. SR-108 N331RW



-----Original Message-----
From: mike.davis@dcsol.com [mailto:mike.davis@dcsol.com] On Behalf Of Jones,
Michael
Sent: Wednesday, June 30, 2010 10:55 AM
To: rebel-builders@dcsol.com
Subject: [rebel-builders] safety wire


hi all

what size safety wire do i need to use on a rebel for securing controls and
also what about prop safety wire

cheers




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