Goodyear 26 tires

Redhawk · Post by **Redhawk** » Fri Dec 25, 2015 12:02 pm

Thinking about installing the larger Goodyear tires on my Maule M4 this winter. I need a project for something to do !
Would anyone be willing to share their field approval paperwork as a basis to show my local FSDO here in Denver for the installation?
Thanks much!

aero101 · Post by **aero101** » Fri Dec 25, 2015 3:17 pm

Which tires, ABW has STC's for all their tire / wheel combinations, 850 goodyears on down ok per TCDS?

Redhawk · Post by **Redhawk** » Fri Dec 25, 2015 5:12 pm

I should have been more specific...
They are the Goodyear 26x10.5-6 tires.

Vtaildriver · Post by **Vtaildriver** » Sat Dec 26, 2015 12:30 pm

Hi Jim,

I am interested in putting a set of 8.50 on my Maule and wanted to make sure that the 8.50 were legal according to the TCDS. Can you point me to the area in the TCDS for the Maule where the 8.50 are listed? .

montana maule · Post by **montana maule** » Sat Dec 26, 2015 3:15 pm

Chris
The 8.50s are listed in the equipment list in the Airplane Flight Manual.

aero101 · Post by **aero101** » Sat Dec 26, 2015 3:17 pm

Vtaildriver wrote:Hi Jim,

I am interested in putting a set of 8.50 on my Maule and wanted to make sure that the 8.50 were legal according to the TCDS. Can you point me to the area in the TCDS for the Maule where the 8.50 are listed? .

Yes, sorry, they're on the aircraft equipment list, not the Type Cert data sheet, actually I believe the 8.50's to be on the optional aircraft equipment list. They used to be available on the Maule Air website, but think you have to call them now to verify you get the right equip lists....

aero101 · Post by **aero101** » Sat Dec 26, 2015 3:29 pm

Redhawk, I'd check with your local FSDO first as most FBO's down there aren't buying big tire field approvals anymore. The large 8.50's are within fractions of being same size as the 26" blimp times anyway, and no paperwork required on that, just a logbook entry!! Having done many field approvals of these blimp tires in easier times, and due to new FAA Guidance on landing gear / systems, it's problematic getting someone to sign off on the field approvals anymore. Not saying can't be done, just not as easy as it used to be, and in some parts of country it's impossible to get an inspector to buy off due to local policies... Good luck!!

Vtaildriver · Post by **Vtaildriver** » Sat Dec 26, 2015 4:58 pm

Hi Rick, Glad to hear from you. Yes I found the excerpt from the Required Equipment List showing the 8.50 tires. Thank you. Hope your Christmas was great.

Thank you Jim for the correction. I was searching the TCDS and thought I was going mad unable to find it.

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maules.com · Post by **maules.com** » Sun Dec 27, 2015 9:20 am

Vtailmaule, if buying 8.50x6 tyres and tubes the Goodyear four groove are superior to the lower durometer McCreary 8 groove tyres which wear quicker and throw more rocks but cost less.
The 26" Goodyear smooth blimp tyres cost more and wear forever and throw no rocks but are actually not a full 26" more like 24. They do however improve the angle of attack for better takeoff and landings.
They are a bit larger ground contact than the 22" 8.50x6 though its best to air down a bit to soften the sidewalls which allows large contact area.
However, with lower air, it is wise to secure the rim of tube type tyres to avoid slippage and valve stem tear.

Vtaildriver · Post by **Vtaildriver** » Sun Dec 27, 2015 12:22 pm

Hi, Jeremy,

I think I will run the Goodyear 26 idea by my PMI (primary maintenance inspector) at the FAA. Do you or anyone have any previously signed 337's available to use as guidance and coaxing. My PMI is partial to GA since he came from GA. As everyone here knows, once I submit my data package the group of PMI's at my local FSDO have a round table meeting and all have to agree before they will give me an approval.

maules.com · Post by **maules.com** » Sun Dec 27, 2015 1:01 pm

Redhawk and Vtail and others interested should collaborate on this. AK came up with basic flight test parameters requiring pilot and A&P signatures stating that certain tyres caused no adverse conditions.
I have a copy somewhere, and submitted with a 337 might make better headway in lower 48. Years ago it worked on a regular basis. At least it takes a bit of the decision making away from the FAA.
The blimp tyres are TSO'd.
I have no experience with the new 4 ply 8.50x6 smooth lightweight tyres.

Vtaildriver · Post by **Vtaildriver** » Sun Dec 27, 2015 1:04 pm

Hi, Jeremy,

I think I will run the Goodyear 26 idea by my PMI (primary maintenance inspector) at the FAA. Do you or anyone have any previously signed 337's available to use as guidance and coaxing. My PMI is partial to GA since he came from GA. As everyone here knows, once I submit my data package the group of PMI's at my local FSDO have a round table meeting and all have to agree before they will give me an approval.

aero101 · Post by **aero101** » Sun Dec 27, 2015 1:30 pm

Not only do the PMI level have to approve, then it has to go to ACO to be approved by engineers as it's considered a MLG component, which the PMI's can not approve anymore per their guidance... The old days are long since gone where a PMI from the FSDO could just stamp it... I've got a stamped field approval I did years ago on my maule, if you send me a regular email with your email address, I will send you a copy?

aero101 · Post by **aero101** » Sun Dec 27, 2015 7:06 pm

aero101 wrote:Not only do the PMI level have to approve, then it has to go to ACO to be approved by engineers as it's considered a MLG component, which the PMI's can not approve anymore per their guidance... The old days are long since gone where a PMI from the FSDO could just stamp it... I've got a stamped field approval I did years ago on my maule, if you send me a regular email with your email address, I will send you a copy?

Got your email, 337 sent, good luck!

Rezrider · Post by **Rezrider** » Tue Dec 29, 2015 8:24 am

send me your email and I can send you 337's too. Jim helped me with 337's and it was very helpful My FAA guy wanted to see 337 examples from other Maules that had been approved.

I love my GY 26's, a good alternative to ABI tires but lots cheaper and durable. Good for most non-paved ops even though not soft like ABI.
I would say go for it.

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