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  #1  
Old 05-22-2015, 03:42 PM
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Palamedes Palamedes is offline
 
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Location: Blairsville, GA
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Default "Safety wire" -- any kind in particular?

I'm finishing up the elevators and the very last stop is bending and securing the hinge pin on the trim tabs.

It specifically says to "secure [the hinge pin] with safety wire".

Dumb question here but, is there any particular type of wire that is considered "safety wire" or will any 22 gauge (guessing at size) wire work?
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  #2  
Old 05-22-2015, 03:55 PM
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Auburntsts Auburntsts is offline
 
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No -- you want a spool of stainless steel safety wire. It comes in soup can sized containers. I used .032 for most things, .041 for my prop.
http://www.aircraftspruce.com/catalo...?clickkey=4386
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Last edited by Auburntsts : 05-22-2015 at 03:59 PM.
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  #3  
Old 05-22-2015, 04:00 PM
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Raymo Raymo is offline
 
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Location: Richmond Hill, GA (KLHW)
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Quote:
Originally Posted by Palamedes View Post
I'm finishing up the elevators and the very last stop is bending and securing the hinge pin on the trim tabs.

It specifically says to "secure [the hinge pin] with safety wire".

Dumb question here but, is there any particular type of wire that is considered "safety wire" or will any 22 gauge (guessing at size) wire work?
The most common wire is .032 made of stainless steel. larger wire (.041) is used for situations where torque is very high, like prop bolts. Smaller wire (.020) is used for lighter jobs and brass wire is used for "break the glass" type applications like fire extinguishers.

The wire should also fill 50% or more of the hole in whatever bolt/pin it is used on (if 25 year old brain matter serves me).
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  #4  
Old 05-22-2015, 04:01 PM
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Palamedes Palamedes is offline
 
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Great! Thanks guys
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  #5  
Old 05-22-2015, 04:03 PM
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Auburntsts Auburntsts is offline
 
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Also AC 43.13-1B has a good section on proper safetywire techniques.
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  #6  
Old 05-22-2015, 06:41 PM
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flyboy1963 flyboy1963 is offline
 
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Default can anyone explain????

why do I not see cylinder bolts safetied?
seems they might be pretty important.
they are drilled for safety wire it would appear.
NEVER seen it done!

WTH? what the hey?
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  #7  
Old 05-22-2015, 08:46 PM
BillL BillL is offline
 
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Quote:
Originally Posted by flyboy1963 View Post
why do I not see cylinder bolts safetied?
seems they might be pretty important.
they are drilled for safety wire it would appear.
NEVER seen it done!

WTH? what the hey?
Primarily, but not exclusively, aero fasteners are loaded in shear. Heavy equipment , engines, etc have fasteners that use clamping loads (contact stresses) and friction and/or tension to carry loads. This is why they have a lot higher torque and material strength specifications. All these fasteners are torqued fully oiled to ensure full tension. This is particularly true for applications with higher plus to minus cyclic loads. This type of joint does not need locking devices, lock washers, safety wires. They actually make the joint less reliable/durable. Like connecting rods. Make sense?
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Old 05-24-2015, 01:06 AM
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grayforge grayforge is offline
 
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The EAA Hints for Homebuilder series have some nice safety wire videos:
http://www.eaavideo.org/video.aspx?v=4147651603001
http://www.eaavideo.org/video.aspx?v=1675022426001
etc.
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  #9  
Old 05-24-2015, 09:34 AM
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Palamedes Palamedes is offline
 
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Thanks!! !!
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  #10  
Old 05-24-2015, 10:23 AM
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skylor skylor is offline
 
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Quote:
Originally Posted by Raymo View Post
... larger wire (.041) is used for situations where torque is very high, like prop bolts.
There seems to be a persistent belief that .041 safety wire is required for prop bolts. This is not the case, at least for Hartzell propellers. The quote below is straight from the Hartzell Compact Hub Owners Manual:

(8) If required by the aircraft maintenance manual, safety all mounting studs with 0.032 inch (0.81 mm) minimum diameter stainless steel wire or equivalent aircraft safety cable and associated hardware (two studs for each safety). Refer to Figure 3-6.


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