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737NG Tire Wear

FADECFAULT From United States of America, joined Nov 2007, 68 posts, RR: 0
Posted (4 years 3 months 3 weeks 8 hours ago) and read 2395 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

Boeing767mech From United States of America, joined Dec 2000, 992 posts, RR: 3
Reply 1, posted (4 years 3 months 3 weeks 7 hours ago) and read 2373 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

FADECFAULT From United States of America, joined Nov 2007, 68 posts, RR: 0
Reply 2, posted (4 years 3 months 3 weeks 6 hours ago) and read 2353 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.

PGNCS From United States of America, joined Apr 2007, 2511 posts, RR: 45
Reply 3, posted (4 years 3 months 3 weeks ago) and read 2267 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!

Tdscanuck From Canada, joined Jan 2006, 12709 posts, RR: 81
Reply 4, posted (4 years 3 months 2 weeks 6 days 22 hours ago) and read 2217 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.

RoseFlyer From United States of America, joined Feb 2004, 8737 posts, RR: 52
Reply 5, posted (4 years 3 months 2 weeks 6 days 20 hours ago) and read 2187 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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