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Backcountry Pilot • 206 Annual and 8.50 tire upgrade

206 Annual and 8.50 tire upgrade

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206 Annual and 8.50 tire upgrade

Good evening all. Writing to you at 2am (my time zone) to dialogue my current annual. I've been seperated from the plane for some time and the excitement of getting back to flying in a couple weeks is becoming more difficult to suppress.

Not sure why I'm posting this except that several threads recently have reminded me of 5XV. The first being the posting of 5 place seat belts in the 180, 182, and 170. If Matt had come out with this earlier, I might still be flying the 180. I've got 3 skinny tailed kids that would cram perfectly into the back seat of a 53' 180. Additionally, I'm having 8.50s mounted along with the Airglas fork and aerotwin gravel deflectors. That matches up well with motodave's discussion of tire size compared to conditions. Lastly, as stated above, I simply need to vent a bit about the annual allowing me to relax and get some sleep.

Two initial hurdles stood in the way of getting the annual started. First, I would need a ferry permit to move the airplane from Fairbanks International to Chena Marina where I'm having the work done. I purposefully let the annual expire because the airplane was placed in flyable storage while I was away for several months. Secondly, I'm not present to fly the plane over. Chena Marina Aviation Services came through on both accounts. They helped me find someone to flying the plane over. A very helpful gentleman that flies for a local government agency moved it over at the request of the CMAS folks. They also did all the arrangements for the ferry permit.

My U206G went into annual on 20ish October. The existing squawks that will surely total the majority of work are a fuel leak from the wing root of the right hand integral bay fuel tank. Three shops have worked on this problem in the last three years progressively increasing the severity of the leak and hemorrhaging of my wallet. Additionally, the fuel pump was leaking slightly. Similar to the wing fuel leak, the fuel pump has been addressed three times in the past 5 years. Each time the pump has been overhauled and started leaking soon after.

The only modification being installed are the 8.50s, Airglas nose fork, and Aerotwin gravel deflector. I thought long and hard about this. Do I really need it. My skill level doesn't match the capability that the bigger feet bring. I might leave Alaska next summer and go somewhere that the bigger tires are hinderance (range and speed).

About two week ago while sitting in the FARP (forward arming and refueling point) of a desolate outpost in Afghanistan, the decision became crystal clear. FUCK IT! I want em! I'll go burn an ass load of hours to build my skill and experience to a level close to what they provide. It doesn't matter. I'M GETTING THEM.


The annual is a couple weeks in and the fuel leak is getting addressed. Mark has given me a couple reports of shoddy seal jobs around the tank edges. I've authorized them to pull the wing if necessary to make sure it gets done this time. I hear that the mains are installed and the nose fork is going on at the start of the week. The fuel pump was the aneroid type with a diaphragm. In accordance with Nathan and Mark's advice, we're replacing it with a non-altitude compensating model. That's in and getting installed.

The ELT remote didn't activate the 406 ELT I had installed last year. I remember the mechanic reporting that the cable didn't reach and he was getting an extension. I made him test it before the extension was installed and it worked. I suspect that he used a phone card instead of the reverse type cord that you must use for this installation. They are investigating that. No other major concerns that I recall.

I'll probably update this from time to time. It's as much for me to vent with this community as anything else. I also hope to post a glowing report of Chena Marina Air Service. After DP's IO-360 upgrade and several other folks' recommendations (MTV), I'm sure they will deliver. Their communication has been terrific and a real relief from 4,800 NMs away.

Below is the before picture with 5XV in flyable storage at FAI. The wife has been nice enough to check on it from time to time. Notice the pile of dry sweep under aft inboard porting of the right wing.

Image

Brett
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Re: 206 Annual and 8.50 tire upgrade

Woohoo! I'm excited for you to get back to her!
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Re: 206 Annual and 8.50 tire upgrade

I can almost feel your excitement of getting back and hoping into the saddle agin. I remember the feeling all to well from the many overseas assignments and chomping at the bit to get back to the US so I could fly.
I really don't think your need that fork, how about sending it donw to me and I'll put it to use. ;)
My son is currently there in Afganistan also, he returns in Jan.
Be safe over there!
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Re: 206 Annual and 8.50 tire upgrade

The altitude compensating fuel pumps are major POS....we removed them from all our 206s. Mark and Nathan are familiar with that gig. You'll be happy with the result.

Tires.....my suggestion is to install an 8.00 X 6.00 tire on the nose, with the 8.50 s on the mains. That is a sweet combination. It'll take a field approval, but those guys have done them before. The issue is, with same size tires on all three, it's REALLY hard to keep the nose tire from arriving first....not good. If you can always load far aft, not too much of an issue, but for real life, having a slightly smaller tire on the nose is perfect.

I ran our 206 both ways, and I'd never go with three tires same size on a 206. And, I think you'll LOVE those tires.

Fly safe, and hang in there. Hope the rest of your tour goes well.

MTV
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Re: 206 Annual and 8.50 tire upgrade

MTV...the proper answer is to get the three 850s on, then get a field approval to replace the main gear tires with 29" ABWs...now that makes a sweet C206...

Or the 850x10 GarAeros...pretty decent as well...
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Re: 206 Annual and 8.50 tire upgrade

Troy Hamon wrote:MTV...the proper answer is to get the three 850s on, then get a field approval to replace the main gear tires with 29" ABWs...now that makes a sweet C206...

Or the 850x10 GarAeros...pretty decent as well...


Troy....shhhhhhhh. He's already concerned about drag. Let him fly those 8.50s a bit....then he'll start thinking bigger tires....and screw the drag. :lol:

I've flown all those configurations on 206s, and they do work great.... 8)

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Re: 206 Annual and 8.50 tire upgrade

I found the drag minimal. With 6.00 on the nose and 7.00 on the mains 135kt cruise. 8.50 on the nose and 8.50X10 mains 132kt cruise. Wimpy, short 2 blade McCauley prop.
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Re: 206 Annual and 8.50 tire upgrade

mtv wrote:Tires.....my suggestion is to install an 8.00 X 6.00 tire on the nose, with the 8.50 s on the mains.

MTV


A mentor once told me that nothing good happens after you say, "fuck it." Damn, now I'm second guessing. Might be past the point of being mounted.

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Re: 206 Annual and 8.50 tire upgrade

For 206, 8.50x10s are the way to go. I have flown both off beaches..... a lot. The 29s give a nose down attitude on 206s (on land) and cause more problems than the solve. The problem is that you can eventually run out of elevator effectiveness as you slow down and the nose comes down hard due to the longer arm created by the added height of the wheel, and you sink the nose wheel, at that point folks add power and it digs is even deeper. I have seen more 206s stuck and nose forks damaged on 29s than ever have on 10s. On top of that the 2-3 knots lost speed, the incipient "wobble' the 29s get between approx 115 and 125 kts, and added wear on the brakes, just make 29s not worth the money.

207 different case 29s better.
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Re: 206 Annual and 8.50 tire upgrade

In the end, I'm going with the 8.50x6 on the mains. They're installed already and they're plenty good enough for me. I don't need any bigger. Frankly, I probably don't need the 8.50x6. I'll have a discussion about the 8.00x6 on the nose. That sounds like a winner.

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Re: 206 Annual and 8.50 tire upgrade

Hi,
I was by the hangar the other day, looks good!!!!
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Re: 206 Annual and 8.50 tire upgrade

74gcbc/76185 wrote:Hi,
I was by the hangar the other day, looks good!!!!


Thanks. Looking forward to getting back and checking it out myself.

I went with the 8.50x6 all the way around. They're installed and there's no turning back. Now I'm just hopeful that we can get the fuel tank leak fixed. That's the biggest deal in this process.

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Re: 206 Annual and 8.50 tire upgrade

I have sort of wondered whether with the equal size tires you might minimize the down force on the nosewheel as you roll out...but definitely will need to land nose high...I do that anyway but I am not a 206 driver...just ridden in a fair number...
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Re: 206 Annual and 8.50 tire upgrade

UH-60andC-180 wrote:
74gcbc/76185 wrote:Hi,
I was by the hangar the other day, looks good!!!!


Thanks. Looking forward to getting back and checking it out myself.

I went with the 8.50x6 all the way around. They're installed and there's no turning back. Now I'm just hopeful that we can get the fuel tank leak fixed. That's the biggest deal in this process.

Brett

I got to fly Dave's 206 before he put big tires on the mains. I'm pretty sure it had 8.50's all around. It was easy to land too level, but if you think about it before touchdown (and have more time than me, lol) it's also easy enough to land on the mains first. Just felt like a more exaggerated flare to my low FW time self, nothing that was uncomfortable.
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Re: 206 Annual and 8.50 tire upgrade

With 8.50s all around, you can definitely land mains first, but......you won't land with that nose tire very far off the surface, and if there are irregularities.....that nose is gonna get beat.

The issue is most pronounced when you're landing with the plane pretty empty.

It works, with focus....it's just that the airplane is REALLY sweet with a nose tire one size smaller than the mains. That is the perfect combo, and that's why Cessna set them up that way from the factory.

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Re: 206 Annual and 8.50 tire upgrade

Thanks for the comments Mike. I've heeded many of your recommendations over the years. That includes the purchase of the 206 over other airframes when we were preparing to have our third child. Mark already has everything mounted and the focus is now on the fuel tank. Not sure I'm willing to have him go back through the process and get the field approval right now. Maybe in the future.

I'll get some instruction and get the feel for landing the 206 in the appropriate attitude. I also keep a healthy first aid/camping kit in the back with some weights to keep the CG pretty aft. Calling it a camping kit because I've heard that's all it is if it's not on you or immediately accessible.

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Re: 206 Annual and 8.50 tire upgrade

Anchorage FSDO will not field approve 8.00 on the nose with 8.50 on the mains anymore. I have heard Fairbanks will not either. Landis was going to add it to the STC but for some reason couldnt/ decided not to. Pretty silly considering you can legally put 29" ABW on the mains with Bush wheels STC.
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Re: 206 Annual and 8.50 tire upgrade

2014 Annual Update

Stopped by to meet Mark and Nathan, see the airplane, and get an update on progress. The tires are on. Not sure what performance benefits or costs I'll experience, but the thing is completely looking bad ass now. That might be relatively superfluous, but I don't care. This post is intended to update the two preexisting faults. I haven't found a great deal of institutional knowledge across the internet or several mechanics on either.

**** WARNING, LONG WINDED POST *****

Fuel leak from integral bay fuel cell: By far, this squawk has been my biggest problem for the last 3 years. This is the fourth shop to address the problem. I was relieved to get an update and plan ahead from Mark yesterday.

When I originally found the fault, it looked like it was coming from the forward fuel outlet on the R/H fuel cell. The 206 has about 3/4 of an inch of clearance between the fuselage and the inboard portion of the wing root. The three previous shops all did the same thing. They popped the access panels off of the tank, cleared away a minimum of sealant, and reapplied sealant liberally.

Mark started along the same path, but simply couldn't clean out all the previous repairs well enough for satisfaction. While I was in transit back to Alaska, they pulled the wing. (foot note: It's kind of a sickly sight to see a fuselage without one arm.) This allowed him to really diagnose the problem.

There was excessive sealant all around the forward fuel strainer. So much so, that the slots between the inboard portion of the forward baffle and the tank wall were completely filled with sealant. If I had been low on fuel and needed fuel through the forward line, the fuel would not have been able to access the fuel line over the baffle.

Mark found the forward fuel line aluminum "L" shaped fitting was loose in it's connection to the airframe. The airplane didn't leak any fuel while sitting in the shop until he wiggled this connection. Amazing how simple the diagnosis ended up being. He's removed the fitting. It has some corrosion wear around it, so he/we decided to replace it. Supposed to come in tomorrow. With the wing off, he was able to access several other make-shift repairs to the inboard portion of the wing. Several mechanics had thrown some sealant up in that area rather blindly. With the sealant removed, he'll prime the whole area and clean up the electrical connections to strobe, nav light, etc.

Further, He's got the pressure tester ready to charge the tank with no more the a 1/2 pound and will leave it charged all night. If there is any leakage, they'll soap the whole area to isolate. Although a significant fiscal event, it is extremely encouraging that the plan moving forward will likely solve the problem This is a great learning experience and I hope to help the next sucker like me along as he tries to get this problem solved. Each shop to this point has told me the only way to solve this is to seal and hope. Hope isn't a course of action.

Fuel pump leak: The IO-550 engine installed on the Atlantic Aero STC has suffered from continuous cylinder repair and replacement for the past nine years. Seven cylinders in as many years. Additionally, I've had the fuel pump off four times since purchase for leaking and flow problems. This is the altitude compensating type with an aneroid. Piecing it all together in retrospect, I've had struggles with maintaining consistent CHTs throughout my ownership.

According to the recommendations of Mark, Nathan, and their component repair shop in Anchorage, we replaced the fuel pump with a standard, non-compensating type. So far, no leaking. Wish I would have done this a long time ago. Again, no other mechanic has taken the time to really define the problem and fix that. I'll have to figure out this leaning thing all over again. I was leaning before, it will just be different during the climb and descent.

In the end, I couldn't be happier with Chena Marina Aviation Services. They've communicated well and have done a great job of getting my families pride and joy back to the shape it deserves to be in. I haven't enforced the premise of making them give me an estimate prior to work. I have no doubt that I'll be paying heavy for this. I made it clear that the focus of this annual was to get the airplane right. I'm willing to accept the risk of the price creeping up.

I'll try to post a couple pictures of the fuel cell sealant disaster if I get time.


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Re: 206 Annual and 8.50 tire upgrade

That's great news! And even though the cost of fixing it right is invaluable, I bet it's insignificant compared to the cost of the previous "repairs" and the frustration of paying for nothing. I remember you getting frustrated when we talked about that leak last.

I can't wait to see how she looks in her new shoes!
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Re: 206 Annual and 8.50 tire upgrade

UH-60andC-180 wrote:"Hope isn't a course of action."

Brett

Love it! Glad your bird is on the right path,
-DP
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