Main landing gear tire

bjoseph604 · August 14, 2016

I noticed a flat spot on preflight. From a parking brake being set? How much is a new tire? 1975 M20F

RLCarter · August 14, 2016

Flat spots (worn tire) are generally from locking up a brake and skidding the tire, flat spots (deformed tire) is from setting too long but the tire will usually become round again with use. Tire prices vary, depends on what brand and who you get it from

**flyboy0681** · August 14, 2016

Let me quiz you this. I just had my nose gear tire replaced because it had a bald spot. Unless it's positioned in the same spot when the gear comes down, how could this happen?

August 14, 2016

1 minute ago, flyboy0681 said:

Let me quiz you this. I just had my nose gear tire replaced because it had a bald spot. Unless it's positioned in the same spot when the gear comes down, how could this happen?

I've e seen small nose tires wear un evenly, most times their edges become scalloped. My guess is from rudder application on take off.

Clarence

bjoseph604 · August 14, 2016

Here is a pic of the tire I was referring to

MB65E · August 14, 2016

Well, I don't think that happened recently. If you can tolerate the tire hop, you could leave it until it wares more. Kinda stinks, but I don't think it's unsafe.

-Matt

**Hank** · August 14, 2016

Looks like someone either braked too hard on rollout,more had their foot in the brake at touchdown . . . The latter can be prevented by keeping your heels on the carpet until you're ready to brake.

August 14, 2016

If that is an Airhawk tire I'd change it right away, the carcass is so thin it wouldn't take much to puncture it. Look for the thread on replacing a tire that took almost a month and he was stranded at home. Imagine the joy of a flat tire while away from home.

Clarence

Yetti · August 15, 2016

Looks like $80 they go up from there. Buy a tube also

http://www.desser.com/aircraft-tires-and-tubes/600-6-6-ply-ah.asp

Bob_Belville · August 15, 2016

I just bought 2 mains, tires and tubes. Condor tires, Michelin Airstop tubes. 6.00 x 6 x 6 ply

~$350. from Aircraft Spruce.

**jetdriven** · August 15, 2016

Desser retreads are like 70$ each. That and airstop Michelin tubes tou can do both mains for ~300$

**cnoe** · August 15, 2016

Looks like $80 they go up from there. Buy a tube also

... but not a Desser tube.

Sent from my iPad using Tapatalk

gsxrpilot · August 15, 2016

Don't touch the brakes until the flaps are raised.

I'll just run go put my flame suit on now ... ;-)

Yetti · August 15, 2016

after the door and vent window are opened

**Hank** · August 15, 2016

12 minutes ago, gsxrpilot said:

Don't touch the brakes until the flaps are raised.

I'll just run go put my flame suit on now ... ;-)

I land, raise the flaps then think about braking. I prefer to be under 50 mph before moving my feet up formate brakes. Still used to make the 2500' turn off with only minimum braking.

Raptor05121 · August 15, 2016

56 minutes ago, gsxrpilot said:

Don't touch the brakes until the flaps are raised.

I'll just run go put my flame suit on now ... ;-)

I do the same. I hope you have room in that suit for more.

**carusoam** · August 15, 2016

This is easy...

that is one simple mis-application of the brakes...

1) it is very easy to lock up a wheel. Doing so often exposes the threads.

2) It is hard to notice doing it when you have no idea what a tire costs....

3) Now you know it is easy to do, and expensive for such a minor mistake, you will know how to recognize it.

did you try to brake hard to make a turn-off?

Did you run out of runway?

Do you always know your airspeed and your ground speed before landing? Ground speed should be the lower number...

These are things I have sacrificed some tires for over the years.

Best regards,

-a-

**Pictreed** · August 15, 2016

Lol. I like bulletin 2 Anthony.

I've done it in the Cessna during training and didn't realize it. It was never enforced to keep your feet off the top of the pedals until you're ready to break.

Tim

**Hank** · August 15, 2016

It's easy with GPS to make sure you're landing in the right direction. Since I've always been based at a untowered fields, and for the last two and a half years am far from any weather reporting instead of being 4nm from a Class D, it has become second nature: on downwind, I check my groundspeed against IAS, and groundspeed should be higher. This ensures that final is into the wind.

When I can't see the windsock, or am overflying looking for it, I always fly downwind, but if IAS is lower than groundspeed, I just change and make that pass upwind, cut over on crosswind and fly downwind with the wind. It used to be so nice to get a final wind check as I was leaving D for pattern entry . . .

This will help your speed not be too high, allowing a gentle, smooth deceleration with minimal,braking. I suspect I will soon find out about brake pad cost, I've been flying on the same set since 2007.

I also concentrate on keeping my heels on the carpet in the pattern. The transition to brakes is deliberate, and not above 50 mph. I replaced both mains in Dec 12.

Yetti · August 15, 2016

heels on the floor before throttle in when taking off. check gear, heels on the floor on short final

**carusoam** · August 15, 2016

checking on downwind... Great reminder. Doing it on final you may run out of time.

When you get this wrong the end of the runway comes up fast and tires smoke like a trained baboon... (A lot!)

Some experiments aren't worth repeating...

Somebody proved it already. Just go with it...

As for flyboy's question... How does this happen on the nose wheel?

Each time the wheel touches down it leaves a small worn spot. It is pretty hard to drag the nose tire the ten or twenty feet that errantly happens like the MLG... Did the nose tire have prior experience? Is it a sign of Midnight hangar fairies at work...?

Best regards,

-a-

**Hank** · August 15, 2016

Nose tires wear out faster than mains, I'm guessing from turning, especially where I used to live with only one taxi exit from the runway. Every arrival ended with a right 180° because it turned tighter than to the left.

I bought my Mooney with not-new tires in June 07; I have replaced the nose tire twice and the mains once, each new tire with a new Michelin air stop tube. I am careful with the brakes on landing (see above).

Even if turning onto a taxiway, the nose wheel slides through the turn, wearing off rubber. I run mine until the tread is just about worn off all the way around. When I start to worry, I check with my A&P and replace it when he says I need to. Without the WV winters any more, I may can push through the winter months as there is no snow or ice on the runways down here in God's Country.

HRM · August 15, 2016

16 hours ago, bjoseph604 said:

From a parking brake being set?

Very possible. Of course, if that was the case the other side should look the same.

When I dropped my E off for annual a week ago, I had forgot to release the PB and climbed back in to do so.

After getting back out my IA admitted that he dragged a Mooney once (he uses a lawn tractor as a tug) before he realized the PB was set.

I will mention no names.

bjoseph604 · August 17, 2016

I seem to recall braking to make a turnoff not too long ago. I didn't realize it was so easy to lockup a tire! I have a feeling that's when it happened. The other tire still looks good but I wonder if I should just replace both mains at the same time and keep the older tire as a spare.

greg51 · August 17, 2016

I just blew a left main on landing, felt like it blew on roll out. handled just like a flat on car. Bought 2 new tires for 90 a piece

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