|Quoting Bluewhale18210 (Reply 6):|
All in all the whole thing is not much different from changing a car tire, it is just tricky on the weight
A widebody mainwheel weighs around 200kg. You need the right equipement to manhandle it into posn.
And it depends what 'busted' means. If the tyre is flat, then you need to change both wheels on the same axle. And it is a little more complicated than a car wheel. The locking nut has to be torqued at up to 600ftlbs, then locked in place. There is also the TPIS transmitter and the Antiskid transmitter sitting there in the axle to get in the way. And when you slide the new wheel over the brake unit all the segments have to line up as it goes on.
With the right tools and enough mechs then 20mins for a B737 nosewheel up to an hour for a B777 centre mainwheel.
And when you have finished you have to blow it up with nitrogen to around 200psi.
A busy hub station will beat these times easily because they do it all the time and are ready. I will take longer. I have 7 flights a day B777 B757 B767 A320 and change about one wheel a year. So when it happens I have to go and get all the gear out of stores, and find some help. On a B737, I can change a mainwheel on my own, but not on the A320 and bigger.
|Quoting Vref5 (Reply 3):|
that they usually retread tyres for certain wheels
Nearly all our tyres are retreaded. Rarely see a new one. They can be retreaded up to 12 times.