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737NG Tire Wear  
User currently offlineFADECFAULT From United States of America, joined Nov 2007, 70 posts, RR: 0
Posted (5 years 5 months 4 weeks 1 day 21 hours ago) and read 2925 times:

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?

5 replies: All unread, jump to last
 
User currently offlineBoeing767mech From United States of America, joined Dec 2000, 1025 posts, RR: 3
Reply 1, posted (5 years 5 months 4 weeks 1 day 20 hours ago) and read 2903 times:



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
User currently offlineFADECFAULT From United States of America, joined Nov 2007, 70 posts, RR: 0
Reply 2, posted (5 years 5 months 4 weeks 1 day 19 hours ago) and read 2883 times:

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.

User currently offlinePGNCS From United States of America, joined Apr 2007, 2820 posts, RR: 45
Reply 3, posted (5 years 5 months 4 weeks 1 day 13 hours ago) and read 2797 times:



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!


User currently offlineTdscanuck From Canada, joined Jan 2006, 12709 posts, RR: 80
Reply 4, posted (5 years 5 months 4 weeks 1 day 11 hours ago) and read 2747 times:



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.


User currently offlineRoseFlyer From United States of America, joined Feb 2004, 9494 posts, RR: 52
Reply 5, posted (5 years 5 months 4 weeks 1 day 9 hours ago) and read 2717 times:

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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