fadecfault
Posts: 65
Joined: Mon Nov 05, 2007 8:44 pm

737NG Tire Wear

Wed Jan 28, 2009 2:34 pm

I was wondering if you guys at other carriers have problems with 737ng main inboard tire shoulder wear. Seems like the outboard shoulders on 2 & 3 wear very fast compared to all the other tires and something should be done about it. Is this a known problem?
The views and opinions written here are my own and do not reflect those of my employer.
 
boeing767mech
Posts: 805
Joined: Fri Dec 15, 2000 5:03 pm

RE: 737NG Tire Wear

Wed Jan 28, 2009 3:54 pm



Quoting FADECFAULT (Thread starter):
Seems like the outboard shoulders on 2 & 3 wear very fast compared to all the other tires and something should be done about it. Is this a known problem?

It's partly due to the fact the MLG on the 737 does not sit complete parallel to the ground. The outboard side of the axle is higher. So you will get slight wearing on the 2 and 3 tires. I seem to remember Boeing had a service letter explaining this, or maybe it was a company service letter from my employer.

David
Never under-estimate the predictably of stupidty
 
fadecfault
Posts: 65
Joined: Mon Nov 05, 2007 8:44 pm

RE: 737NG Tire Wear

Wed Jan 28, 2009 4:59 pm

Ah I see, I haven't seen the service letter. Our ron chk limits for tires is 3/32's and we pull 737 mains left and right due to those shoulders being out of limits.
The views and opinions written here are my own and do not reflect those of my employer.
 
PGNCS
Posts: 2249
Joined: Sun Apr 15, 2007 5:07 am

RE: 737NG Tire Wear

Wed Jan 28, 2009 10:13 pm



Quoting Boeing767mech (Reply 1):
It's partly due to the fact the MLG on the 737 does not sit complete parallel to the ground. The outboard side of the axle is higher.

I am curious why it is designed this way. Any insight into why Boeing built it this way? Are there advantages to this that aren't obvious to us pilot types? Just wondering, thanks!
 
tdscanuck
Posts: 8572
Joined: Wed Jan 11, 2006 7:25 am

RE: 737NG Tire Wear

Thu Jan 29, 2009 12:51 am



Quoting Boeing767mech (Reply 1):
I seem to remember Boeing had a service letter explaining this, or maybe it was a company service letter from my employer.

737-SL-32-077 talks about shoulder wear, but nothing specifically about why it happens, just how to deal with it.

Tom.
 
roseflyer
Posts: 9606
Joined: Fri Feb 13, 2004 9:34 am

RE: 737NG Tire Wear

Thu Jan 29, 2009 2:51 am

When the 737 gear extends, the gear is straight down. However when the weight is on the wheels, the wings do flex and there is an outward tilt on each main gear. The result is a gear that is not even loading on the tires. The braking though, which is the most important factor is not affected though.
If you have never designed an airplane part before, let the real designers do the work!

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