850-6 4 PLY AERO CLASSIC SMOOTH TUNDRA TUBE TYPE (AA4K5)

[Wxbee]

Raising this thread from the dead!!
My mechanic is saying the load rating in the Aero classics 8.50x6 4ply is 1600lbs per tire, and to be legal . It to has to be able to support the aircraft’s weight on just one tire. Also that they were meant for LSA only. Anyone have any experience in this or any literature I can to point him to.?
Thanks

[n2582d]

Mike,
I'd ask your mechanic to provide documentation to show what he claiming. As seen here these tires meet the requirements of TSO-C62e. The 170's max. weight is 2200 lbs. The way I read CAR 3.362 C-170 tires only need a load rating of 1100 lbs.

WHEELS AND TIRES

§ 3.361 Wheels. (a) Main landing gear wheels (i.e., those nearest the airplane center of gravity) shall be of an approved type.

(b) The rated static load of each main wheel shall not be less than the design weight for ground loads (§ 3.242) divided by the number of main wheels. Nose wheels shall have been tested for an ultimate radial load not less than the maximum nose wheel ultimate load obtained in the ground loads requirements, and for corresponding side and burst loads.

§ 3.362 Tires. A landing gear wheel may be equipped with any make or type of tire, provided that the approved tire rating is not exceeded under the following conditions:

(a) Load on main wheel tires equal to the airplane weight divided by the number of wheels,

(b) Load on nose wheel tires (to be compared with the dynamic rating established for such tires) equal to the reaction obtained at the nose wheel, assuming the mass of the airplane concentrated at the center of gravity and exerting a force of 1.0g downward and 0.31g forward, the reactions being distributed to the nose and main wheels by the principle of statics with the drag reaction at the ground applied only at those wheels having brakes. When specially constructed tires are used to support an airplane, the wheels shall be plainly and conspicuously marked to that effect. Such marking shall include the make, size, number of plies, and identification marking of the proper tire.

Note: Approved ratings are those assigned by the Tire and Rim Association or by the Administrator.

[Wxbee]

Wow Gary thanks so much! That saved my bacon and my A&P really appreciated the reference!
Now to try and convince him that the Cleveland wheels that are on it are ok per the service letters!I purchased it with Cleveland’s but after some digging there isn’t any mention in the logs….but that’s a different post!
Thanks again!

[n2582d]

You’re welcome Mike. I corrected the initial link in my last post which shows the FAA letter confirming these tires meet TSO-C62e. As a side note, it’s interesting that, according to CAR 3.361 (a), the tailwheel doesn’t need to “be of an approved type.” (When I read the word “wheel” I think of the tire and rim assembly, but here I believe the CAA is just referring to the rim). Given that these rules were written not long after planes were still using tail skids I guess this is not too surprising.

On a related subject, on another website I was saddened to see that we are still losing 170’s due to guys not getting rid of their hollow aluminum axles. Especially for those installing larger tires, this SAFO letter reminds us “persons interested in operating aircraft with oversize tundra tire, ski, or wheel/ski installations should be aware of the safety risks involved and take appropriate measures to reduce those risks.” We need to replace hollow aluminum axles with steel or at least solid aluminum axles and then periodically dye check or, if steel, magnaflux the axles. There’s no better time to do that then when installing larger tires.

[Lmaitkens@gmail.com]

I own a 170B with STC SA13GL Cleveland Wheels and brakes (single caliper). Would I be able to install 800-6 tires on my aircraft with this STC? Currently have 600-6 tires.

[Bruce Fenstermacher]

I own a 170B with STC SA13GL Cleveland Wheels and brakes (single caliper). Would I be able to install 800-6 tires on my aircraft with this STC? Currently have 600-6 tires.

According to the 170 TCDS, yes. And it was common practice to do just that and there was never a question. That is until sometime in the recent past the new Cleveland wheels, when received, had a sticker on them indicating the wheels were only to be used with 6:00 x 6 tires.

This is a plain old sticker mind you. May be it stayed on, maybe it fell off. Maybe it was taken off which would be best practice when installing the wheels. Problem I see with this sticker, if it ever was on your wheels is that to the best of my knowledge the STC does not restrict tire size. I think that sticker must have been for the home builders market which of course would have no legally binding obligation to abide by it.

BTW see this thread. viewtopic.php?t=12519 It explains that you could install certain Cleveland wheels and brakes under a Service Bulletin and not an STC at all.

[Lmaitkens@gmail.com]

Thanks for your reply.
To be clear will the 800-6 tires fit on my 170B ? Any clearance issues with the brake calipers?
Thank You

[n2582d]

From the first page of this thread:

I currently have 8.00 ... I get minor rubbing on one side from the caliper …

[G-MDAY]

I’m also getting a 2mm or 3/16 rub on the inside of both tyres in one position I’m going to install a 1/4 space behind the brake disk see if that fixes it

[Joe Moilanen]

I’m also getting a 2mm or 3/16 rub on the inside of both tyres in one position I’m going to install a 1/4 space behind the brake disk see if that fixes it

It fixes it, that’s what I did.

[mmcmillan2]

Spacer between the wheel and the brake disk?? Pics?

[ghostflyer]

I had been flying an American Champion Super Decathlon with Large tundra tires [can’t remember the size] ,pressure was 18 psi each as per gauge in cockpit. I was landing a on a smooth Bitumen runway which was very wet with some small puddles. OMG it was scary . It was an aquaplane situation until I stopped. The aircraft was slide ways nearly the whole strip. Using tail wheel steering was a NO NO , as it was causing a 360 spin. I shut the engine down totally and went for the ride . NEVER again will I land that aircraft on a wet runway. I will pick the mud and slush on the side of the runway next time .

PS. This aircraft had sensors on each valve stem and a gauge in the cockpit telling you your tire pressures all the time . Legal ???

[DaveF]

Spacer between the wheel and the brake disk?? Pics?

viewtopic.php?f=24&t=9857

[G-MDAY]

There are no pics in the thread ….. I’m getting 4 made I’ll include pic and a drawing here so you can make your own or get them made ABW although very helpful do not have any certification for there spacers.