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Aircraft Tire Questions  
User currently offlineRyeFly From United States of America, joined Jun 2000, 1396 posts, RR: 0
Posted (13 years 9 months 3 weeks 2 days 4 hours ago) and read 6915 times:

Hi!

As you know tires have been in the news lately, so that got me thinking...

Who makes the tires for aircraft?

How long does a tire generally last for a airplane like say a 757?

I have been on a couple flights where a tire needed replacing before we boarded. On one flight however we had already boarded and then an announcment from the Captain told us they need to change a tire but there was no need to get back off. I thought that was strange. Are they allowed to change a tire with passengers onboard? I guess so because they did, but I was just checking how often that happens.



11 replies: All unread, jump to last
 
User currently offlineUAL Bagsmasher From United States of America, joined Sep 1999, 2146 posts, RR: 10
Reply 1, posted (13 years 9 months 3 weeks 2 days 4 hours ago) and read 6879 times:

Yes..they frquently change tires while PAx are boarding and Ramp is loading the aircraft. The jacks they use are impressive. Some even have a hose that uses nitrogen from the valve stem of the tire being deflated to jack up the Bogey.

User currently offlineNKP S2 From United States of America, joined Dec 1999, 1714 posts, RR: 5
Reply 2, posted (13 years 9 months 3 weeks 2 days 3 hours ago) and read 6874 times:

100 landings per tire is nominal, which of course can vary with conditions. R&Ring a tire with passengers board is no big deal as you are only raising a strut a few inches. The jacks are not as big as one would expect them to be, given the nature of their work...they're not much bigger than a good sized auto floor jack. They are hydraulic and can be pumped up manually using fast/hard or easy/slow pistons, but mostly an air operated piston..."shop" air, nitrogen from a cart or a jumper hose from the old tire is used. Using the "old" tire for an air source ( Nitrogen really ) saves a lot of work and is super efficient, and in any event the old tire must be deflated anyway before it is shipped back to the wheel/brake shop.

User currently offlineRyeFly From United States of America, joined Jun 2000, 1396 posts, RR: 0
Reply 3, posted (13 years 9 months 3 weeks 2 days 3 hours ago) and read 6860 times:

Thanks for the interesting info guys!

User currently offlineVC-10 From United Kingdom, joined Oct 1999, 3697 posts, RR: 34
Reply 4, posted (13 years 9 months 3 weeks 2 days 3 hours ago) and read 6857 times:
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NKP S2

The tyre has to be deflated before the hub nut is removed. If you do not you could end up "wearing" the hub half.

Another point is that the tyres are often re-moulded but this depends on the tyre being removed before the tyre carcass is damaged. Before being remoulded the tyre will undergo an X-ray examination to make sure there are no hidden defects.


User currently offlineCrjmech From United States of America, joined Jun 2000, 260 posts, RR: 1
Reply 5, posted (13 years 9 months 3 weeks 2 days 3 hours ago) and read 6853 times:

Just a quick add-on to the previous (and excellent) posts. Most jacks raise the tires by compressing the strut. Since the jack isn't taking that much of the plane's weight and doesn't really lift it up, pax and bag loading can continue as normal.


Thou shalt mind thine altitude,lest the ground reach up and smite thee.
User currently offlineVC-10 From United Kingdom, joined Oct 1999, 3697 posts, RR: 34
Reply 6, posted (13 years 9 months 3 weeks 2 days 3 hours ago) and read 6852 times:
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Ned,

I cannot agree with your last post. If the strut is compressed a certain amount by the weight of the a/c how is the jack going to compress it further?

Incidentally, you can jack a 747 loaded to max taxi weight for a wheel change.


User currently offlineJt8djet From United States of America, joined Jul 2000, 214 posts, RR: 0
Reply 7, posted (13 years 9 months 3 weeks 1 day 19 hours ago) and read 6840 times:

RyeFly, to answer your first question.
All the big tire manufactures make aircraft tires. The one's I see the most are Goodyear & Michelin, but I'm sure there are others. BF Goodrich has several wheel & brake shops through out the US.


User currently offlineCrjmech From United States of America, joined Jun 2000, 260 posts, RR: 1
Reply 8, posted (13 years 9 months 3 weeks 1 day 15 hours ago) and read 6827 times:

Curses! Foiled again! Correct as always, VC-10. But this leads me to a question- how high do you have to jack a large a/c in order to change a wheel assy.? Can this cause problems with the jetway and/or the baggage conveyor? I've never changed tires on an a/c at a jetway, or come to think of it, a large (Boeing/Airbus size) plane either. Just the regional-size birds.


Thou shalt mind thine altitude,lest the ground reach up and smite thee.
User currently offlineVC-10 From United Kingdom, joined Oct 1999, 3697 posts, RR: 34
Reply 9, posted (13 years 9 months 3 weeks 1 day 15 hours ago) and read 6821 times:
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I would say about 7 inches. A large jet normally has a bogie for the main gear in which case when you jack it for a wheel change you pivot the bogie around the set of wheels that will be staying on the ground. You will lift the a/c to some extent but not as much as an a/c with single axle u/c.

Modern jetways are also self leveling so as the a/c goes up 2 or 3 inches so will the jetway


User currently offlineWilcharl From United States of America, joined Jun 2000, 1166 posts, RR: 3
Reply 10, posted (13 years 9 months 3 weeks 1 day 15 hours ago) and read 6819 times:

Correct me if im wrong but Didnt BF Goodrich's A/C tire or tyre depending on what side of the pond you live on get bought out by Michelin who now slaps thier name on the tires. Ive seen Michelin AIR tires, Goodyear Flight Leaders, and i saw one tire that was a japanese made Bridgestone that was retreaded with a goodyear retread.. caught me kind of odd. Also I noticed that our old tires get retreaded with a really cheap atuomotive tread and get thrown on our jetways Intersting i thought and even more intersting is the company that services our jetway fills them with nitrogen not air just as if they were on a plane



User currently offlineJt8djet From United States of America, joined Jul 2000, 214 posts, RR: 0
Reply 11, posted (13 years 9 months 3 weeks 1 day 10 hours ago) and read 6802 times:

Wilcharl,
Yes, BFGoodrich sold the tire division to Michelin.
BFGoodrich Aerospace is a seperate company that, among other things, has several wheel & brake shops. They do tire retread & brake overhauls. The airline I use to work for had Goodyear supply the tires and BFGoodrich do the wheel build up.


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