Thank you so much! I'm doing this for the first time on some racing disc brakes and the other videos I found weren't talking through the process very well but you did. After your video, I'm doing it sort of right. Thanks!
At 2:45 its best to put the wire into the bolt that is coming OVER the twist, meaning the one that if you pull in that direction (towards the bolt) it will tighten the twist. Also, it's best to not have any untwisted wire between the twisted and bolt hole, you've got an 1/8 - 3/16" or so of untwisted wire, that's not good because it leaves only one wire to hold the load not the twist. But other than that, good video. Thanks.
Piece of cake like this. Few days ago I have just done overhaul of piston of tanker ship main engine. I was standing inside engine and twisting securing wire by hand and by normal pliers. It was all slippery from oil, awkward positions, no room and it took me about 1.5 hour to make 6 wires. And that was even good time, other guys where much slower. I wish I had tool like this.
John. I don't see any reason why it wouldn't work in your application. Depending on the size of the bolt, use at least .032" safety wire due to centrifugal forces. A.J.
So safety wire prevent vibration on a bolt or nut so it won’t get loose but why won’t the FAA tell these owners or technicians to use lock tight because lock tight does work good for car industry well I’m not sure cause I’m a car mechanic not air plane but if someone have a answer to this can you please explain to me why safety wire are use and not lock tight
So, the first reason for that is the level of vibration (acceleration and amplitude). It is much more higher than existed in automotives. The second one is criticallity of joints. A lot of joints and connections aboard are safe-life. In other words - you might have a huge problem in case of disconnection, probably with catastrophic result. As you understand, there is no chance to take a stop midair to check if all goes well..
B2 Instructor well I’m automotive we too use safety wires but more like high performance racing engines because of the amount of vibration on exhaust bolts or nut or certain area like rear differential cover but it’s good to know that these safety are made for us humans from panicking
@@taylorseng9918 if you interested about high performance jet engine, check this channel ru-vid.com. This guy knows all about it. By the way it is another video about safety wire on this channel.
The easiest and cheapest way is to make one. Grab a handful of bolts with safety wire holes and put them through a piece of wood or metal and tighten them down. Then safety wire away.
Thanks folks. And if I can give myself another plug for the pilots out there. I have a website called "Airport Courtesy Cars" on the web at www.airportcourtesycars.com Check it out, it lists over 1,900 courtesy cars nationwide. Will be making more aviation maintenance videos with AJ soon.
Thanks for the good catch. You have a good point, however AC 43-13-1B, 7-125. TWISTING WITH SPECIAL TOOLS. Twist the wire with a wire twister as follows. (See figure 7-4.) CAUTION: When using wire twisters, and the wire extends 3 inches beyond the jaws of the twisters, loosely wrap the wire around the pliers to prevent whipping and possible personal injury. Excessive twisting of the wire will weaken the wire. a. Grip the wire in the jaws of the wire twister and slide the outer sleeve down with your thumb to lock the handles or lock the spring-loaded pin. b. Pull the knob, and the spiral rod spins and twists the wire. c. Squeeze handles together to release wire. There is no mention within section 7-125 pertaining to tool marks on the wire. In my experience, the minor tool marks created by the safetywire twister do not affect the integrity of the safety wire. Thanks for watching and especially thanks for asking the question. a.j.
Ian Cunningham yea a TI would cut out lockwire if there are marks on it. Not sure what the exact TM,AR,or Da-Pam is for lock wire but any nick in the wire is a no go. But that's army aviation
He safety wires way differently than we do in the Air Force. His safety wire is a little neutral, but it’ll work. He didn’t do any around the worlds so you know that bitch is loose. He didn’t get close to coming to the hole on the second bolt. And he twisted way too much as he mentioned on his pigtail. Plus he bent his pigtail the wrong way, bending it back the way you came is gonna make it loose.
I think you did the first one poorly. Should have moved over to the next hole. Notice the wire is not able to exert any torque on the bolt head. The other ones you did before the video do. I think its a "do over". And extra sloppy as it is made to instruct others......
Back when I was an electrician on the last USMC Squadrons of the UH-34s we safety wired way different, . Here’s what aircraft use today. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-7Xck44xYeaE.html. On the 6 bolt pattern in your case, you start with 1 bolt (if it loosens, it tightens the next. Then there’s a measurement (I’ve forgotten) where you loop in the 1 wire of the last and start on the next. But the principal of “if it loosens 1, it tightens the next”👍. Great videos👍
Why it's the only sure way to keep bolts from rattling around in places where lock washers can't be used be relied upon. It's really not that old of an invention as it's only been in wide spread use for the past 50 years. And it's also legally required for all structural aircraft bolt. The point of the wire is not to stop the bolts from working lose that's what proper torque is for, it's to hold then in there holes if they do work lose so they can be corrected at 100 hour inspection
FAA requirement for safety wire must never be overstressed. Safety wire will break under vibrations if twisted too tightly. Safety wire must be pulled TAUT when being twisted, and maintain a light tension when secured. Reference AC 43.13-1B paragraph 7-124(e)
@@user-zm1vt3rf9b There is a difference from being taut and tight. Reference AC 43.13-1B Ch 7 paragraph 7-124. SAFETY-WIRING PROCEDURES. e. Safety wire must never be overstressed. Safety wire will break under vibrations if twisted too tightly. Safety wire must be pulled taut when being twisted, and maintain a light tension when secured. (See figure 7-3a.) As a DME safety wire is a basic skill and on all oral and practical tests. If you over tighten the wire on a practical test project it is incorrect and will be considered a failed project. The keyword is “taut.”
@@user-zm1vt3rf9b I have an A&P blog for all FAA applicants on Facebook that is open to anyone to help them prepare for the O&P tests at facebook.com/StacheAir/?ref=bookmarks
Almost never used anything but .32 thousandths. Funny thing with saftey wire is that you can scrutinize pretty much anyone's work, very subjective. Practice and learning the tricks of the trade help
The saftey wire needs to cover 70 to 80 per cent of the diameter of the bolt hole, that's the choice about .032 or .041 wire and the 7 turns per inch, I have seen alot of unairworthy saftey wire on propellers
It seems like you could have started the first wire on the far end of the bolt and come around clockwise so that it's tending to tighten it. The way it's done, the first bolt has wire going pretty much strait radially outward, not tending to tighten or loosen.
Thanks for the comment. The objective of safety wiring is to prevent the bolt/nut from loosening. You will note that when wiring the first bolt, there is an slight angle maintaining tension on the bolt as it leads to the second bolt. This tension prevents both bolts from loosening. Were this a wood prop, subject to swelling and shrinkage, this method prevents the bolts from turning when the wood shrinks. BTW, wood props must be re-torqued and safetied every 50 hours or as the manufacturer specifies.
Jordan Stephens - we never get a straight on view to really tell if it is a neutral safety but it's pretty close. If I'm assembling something and end up with a bolt with the safety wire in this position I'll swap a couple of the bolts to avoid the neutral position (and the stink eye from my TI). He could have came from the "back side" of the hole but that can end up being loose around the bolt. Also, if the twisted pair touches the single wire going into the near side hole my TI wouldn't buy it.
@@jenniferrice5098 It actually depends on the wire's thickness. If the wire measure from 0.019 to 0.026 it takes from 9 to 12 twist (per inch distance). If it measure 0.027 to 0.042, its 7 to 10 twist. The more the wire is thick the less you need to twist.
Thanks Danny. Yes, I am an USAF vet, 63-67, but I was a Cartographic Analyst. Didn't learn to safety wire until I went to A&P school in mid-life. Practice makes perfect.
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Has anyone ever used safety cable? My company began using it over 15 years ago. So much easier! The down side is cost. Also the ratcheting feral crimper requires periodic calibration. But the ease and time saved is great.
Im not here to be a jerk but by the Armys standards this isn't good ad all. That safety wire could be much tighter and you folded your pig tail on the wrong side. the pigtail shouldn't touch safety wire. very informative video but not the greatest safety wire.
I would use one long piece of wire and go around every bolt. That is if its a .25 wire. Something bigger might be more challenging unless it only two bolts.
Nice thx. I'd like to see the vid end with the list of checks the inspector makes to ensure correct installation, and a list or examples of common and uncommon failures.
p1epoppa they do use then on some places buy you never just rely on torque alone the safety wire is to hold the bolts in there holes so any that do work lose can be corrected at the next 100 hour inspection without getting lost or faking into something they shouldn't
Can I suggest you do a small countersink on the holes in the bolt heads? It saves the wire from turning 90 degrees over a sharp edge. Also, you are wiring against bolt rotation, not the propeller rotation. That's how I've always done it anyway.
i get what your saying myself, but i personally have never seen what your suggesting, it has always been a very sharp angle coming right out of the hole, however I have never seen safety wire break on such a location, and i work with safety wire almost daily.
