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-   -   My head hurts, someone please 'splain! (https://vansairforce.net/community/showthread.php?t=97019)

pat 03-02-2013 09:23 PM

Watched it happen! 6x6 inflated, removed from axle, bang! Nasty broken arm. He was lucky.

aerhed 03-02-2013 09:26 PM

I think one just came off and the wheel halves cocked and blew the other two off. Like I said, I was only on a couple threads and it might have been 3 PSI or something. Just a shot of air to swell the tube. Sure surprised me. Point is, when removing a wheel, you really don't know what's holding the wheel halves together until you've got it apart. Going the other way, when you've just assembled a wheel is a bit different because you've just looked at the bolts and wheel halves etc. It should still be in a cage to inflate but nobody does that except airline shops (unions). The rest of us just trust our eyes on assembly.

pierre smith 03-03-2013 05:26 AM

Aww.
 
Quote:

Originally Posted by aerhed (Post 749052)
. Pierre has been riding with Lady Luck drivin' his Ol' 55. .

So,do you guys mount a new tire and tube assembly on the axle deflated, not knowing whether or not you've pinched the tube? C'mon guys, I've also seen a newby wannabe A&P start removing wheel bolts without deflating it first...yeah, it burst. Some people are very intent on removing themselves from the gene pool.

In the Ag business, Lady Luck has no place...it needs to be calculated. Same thing goes for mounting/dismounting tires and tubes. I have many A&P friends and have never heard of deflating our tires before removing them...so do whatever floats your boat. All ten of my big 10" ag airplane tires gets torqued to 150 inch-pounds before I air it up.

I didn't get to be 68 because I'm stupid, doncha think?

Best,

curtis 03-03-2013 07:28 AM

Pierre, my initial reply was about safety and not intelligence. After reading the replies in this thread I recognize that my post is from habit of working on high pressure wheel/tire assemblies and probably not as applicable to our smaller tires. I do partially inflate my tires after working on them before putting them back on the axle. Once installed I fully inflate them.

Curtis

Sig600 03-03-2013 09:16 AM

So I went back to the hangar yesterday, looked at the parts for about 12 seconds, and then put everything together.


aerhed 03-03-2013 09:25 AM

Quote:

I have many A&P friends and have never heard of deflating our tires before removing them...so do whatever floats your boat.
Most of my best friends ARE A&P's. Didn't mean to dig at ya Pierre, but I think I went to a pretty good school for six years. My profs were pretty adamant about deflating before wheel removal. Since then I've been in the field for almost thirty years. When I got maintenance training for American we hit wheels and brakes pretty good. Rule one for wheel removal was deflate first unless it went in a caged dolly first. Same thing for Delta and the other four airlines I got maintenance training on. My boat floats okay and if I ruffle a few feathers while I'm paddling I apologize. But...when I hear a waterfall you can bet that I'm paddling the other way. I also don't have a problem admitting that I sometimes still do things wrong. When I hear a new tip I usually try to think it over before I dig in my spurs. Sometimes my neck hair comes up and I think "I've been doing that?" Sometimes I get muley and then years later it hits me...like a bolt out of the blue.

jjconstant 03-03-2013 09:51 AM

Quote:

Originally Posted by Sig600 (Post 749281)
So I went back to the hangar yesterday, looked at the parts for about 12 seconds, and then put everything together.


LOVE THE GIF:D Man have I been there more than once!

gasman 03-03-2013 11:41 AM

Quote:

Originally Posted by aerhed (Post 749288)
Most of my best friends ARE A&P's. Didn't mean to dig at ya Pierre, but I think I went to a pretty good school for six years. My profs were pretty adamant about deflating before wheel removal. Since then I've been in the field for almost thirty years. When I got maintenance training for American we hit wheels and brakes pretty good. Rule one for wheel removal was deflate first unless it went in a caged dolly first. Same thing for Delta and the other four airlines I got maintenance training on. My boat floats okay and if I ruffle a few feathers while I'm paddling I apologize. But...when I hear a waterfall you can bet that I'm paddling the other way. I also don't have a problem admitting that I sometimes still do things wrong. When I hear a new tip I usually try to think it over before I dig in my spurs. Sometimes my neck hair comes up and I think "I've been doing that?" Sometimes I get muley and then years later it hits me...like a bolt out of the blue.

You are talking about 150 to 200 psi...... in a wheel / tire assy that is how big??

edbooth 03-03-2013 11:48 AM

Quote:

Originally Posted by Don at Airflow (Post 749159)
?? 6? diameter wheel with 1 PSI pressure equals 28 lbs of force. Strips the threads on a ?-28 AN bolt?????? Seems odd to me. But hey I wasn?t there.

Is it not 1 PSI X SQ Inches of tube?.....Thats going to be a lot more than 28 PSI.:confused:

Don at Airflow 03-03-2013 12:04 PM

I may be wrong here but I assumed that a 6.00 X 6 wheel is 6? in diameter. 1 PSI on a 6? diameter makes 28 lbs of force on that disk. I think I did the math right??? So the wheel halves would be being pushed apart with a 28 lb force. Or each ?? bolt (4 bolts on the wheel?) would have 7 lbs of tension on them.


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