Tire cuts

[oligoe]

Hello Guys,

I am an ex B1/B2 engineer now flying as pilot but I am in charge of a maintenance manual describing some maintenance procedures and limits for flight crews.

Unfortunately I only have a pilot rating on the MD90 so I would seek some advice concerning tire cuts limits.

The Boeing AMM first stipulates two categories of cuts, whether the cut is more or less than "50% of the length of the rib".
How do you understand that? Because later they talk about the cut extending "across" to more than 50% of the width of the rib and also the depth limit which is then common sense.

Any help would be greatly appreciated, thanks in advance,

Og

[Dodo56]

It depends to some extent who your tire supplier is but the requirements are pretty generic.

Here's a link to some care and maintenance manuals: Goodyear Aviation Tires - Technical Resources - Tire Care and Maintenance Manual (http://www.goodyearaviation.com/resources/tirecare.html)

Note these are not definitive controlled manuals and are not subject to revision service. Use for guidance only. Your NAA may also have some reference material (in UK this is CAP562).

To your specific question, normally the "width" of the rib (between grooves) is the most critical as cuts across there can start a tread peel between the grooves. Cuts in the same direction as the grooves are not so important (subject to depth as you say).

Hope this helps!

[JamesA]

Dunlop produces a tyre information booklet, 'A Pocket Guide to Tyre Know-how. Good basic information well presented with photos, etc. Last known address:-
Dunlop Aircraft Tyres Limited,
40, Fort Parkway,
Erdington,
Birmingham. B24 9HL
England.

And, it is free

[Fargoo]

Dunlop do a great manual for their tyres including inspection details,

http://www.dunlopaircrafttyres.com/tech_support/dm1172/DM1172.pdf

[SeldomFixit]

Lets skip the bull$hit - Black ? Round on top and not flat at the bottom ? :ok:

[muduckace]

The Boeing AMM first stipulates two categories of cuts, whether the cut is more or less than "50% of the length of the rib".


What they are afraid of is thowing a tread. Any cut into the groove from a rib is a no-go.

[oligoe]

Hy guys,

Thank you very much for all your replies!

Muduckace, what you refer to I guess is the limit stated as: extending to more than 50 % across the rib.

But at the beginning, they talk first about more than 50 % of the length of the rib. According one of our mechanics it could mean if the cut is more than half of the circumference of the wheel. It is really this one that blocks me because I have never seen such limits in the past.

Thanks very much again for the time spent answering me!
Have a nice WE.

Og