Filiform Corrosion and Bonanzas

Рет қаралды 9,783

Күн бұрын

FlyWire takes a look at Filiform Corrosion on the magnesium flight controls on the Bonanza. Don't just Monitor this kind of corrosion, it never really stops and it might trash your control.
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FlyWire is about exploring flight and the freedom this incredible experience brings us on a personal level. Flying has always captured the imagination and excitement of living life to its fullest. Hi, I'm Scott Perdue. In a former life I flew the F-4 and F-15E, more recently I retired from a major airline. I've written for several aviation magazines over the years, was a consultant for RAND, the USAF, Navy, NASA as well as few others, wrote a military thriller- 'Pale Moon Rising' (still on Kindle). But mostly I like flying, or teaching flying. Some of the most fun I had was with Tom Gresham on a TV show called 'Wings to Adventure". We flew lots of different airplanes all over the country. Now with FlyWire I want to showcase the fun in flying, share the joy and freedom of flight and explore the world with you. Make sure you subscribe if you want to go along for the ride!
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Пікірлер: 40

@captaincurle4529 9 ай бұрын

Student A&P here. We just recently learned about corrosion in class, and this helps explain it a lot better. Thank you!

@jimgiordano5378 3 жыл бұрын

I just replaced both ailerons in my 1961 V-Tail due to filiform corrosion. In three months it went from a couple of quarter sized rough worm tracks to covering a great deal of the control surface. My airplane has always been hangared and lives in Michigan. Total cost to have them re-skinned in aluminum, painted and balanced was $7,500. Great content as usual. Thanks FlyWire.

@FlyWirescottperdue 3 жыл бұрын

Jim- Thanks for watching and commenting!

@flydogairventures4318 3 жыл бұрын

Hi, is there an aluminum re-skin option for these V tails? I'm facing the same issue.

@jimgiordano5378 3 жыл бұрын

@@flydogairventures4318 Yes, I had my ailerons reskined in aluminum.

@williamtrusler1508 3 жыл бұрын

I had both elevators on our F33A refinished about three years ago due to corrosion. It was quite a lengthy process to get all moisture removed and then refinished. Had them done in Ennis and they're doing well. I learned from your video the technique for checking them. Great information. Thank you!

@KB4QAA 3 жыл бұрын

As I recall, the USN first experienced filiform corrosion in the early 1960's on the P-3A Orion patrol planes, in conjunction with the introduction of polyurethane paints. These paints were much less porous to moisture that was trapped underneath than older paint types. The solution was careful surface preparation, and Alodine conversion coating prior to painting. Even when spot repairing corrosion, when the bare aluminum is exposed it is given spot Alodining before re-painting. Everything in the navy is about corrosion control! Cheers, Bill, retired NFO.

@FlyWirescottperdue 3 жыл бұрын

Good info Pelican!

@77thTrombone 2 жыл бұрын

Without revealing my educational background, I will disclose that I had a course in painting. Rules 1, 2, 3: Surface Prep Rule 4: match the primer to the surface and the paint to the primer. Ironically, the only color mentioned in the whole course was "red lead."

@Nord3202 Жыл бұрын

The best primer after the magnesium conversion coating treatment is a two part epoxy primer.

@Parr4theCourse 3 жыл бұрын

It’s a “GOOD-DAY” when you learn something new . . . As I “thought” only the V-Tails had the magnesium ruddervators/elevators!

@VTalesAviation 3 жыл бұрын

Great video! Very informative. I've been "monitoring" some filiform on my V35. Time to take care of it.

@FlyWirescottperdue 3 жыл бұрын

Thanks, if I helped save your Ruddervators then the video was a success!

@martinp1544 3 жыл бұрын

We just had our magnesium ruddervators repainted on our ‘79 V- tail. We had been tracking it for a couple of years but like Scott noted. Suddenly we noticed that it had rapidly grown & expanded. Fortunately, the paint shop says it was very minor & the repaint went well. They really look very nice now.

@FlyWirescottperdue 3 жыл бұрын

Good catch!

@williamoddo9199 3 жыл бұрын

I just sent my right trim elevator on V35B for worming ... got it home just before the pandemic hit, lucky. Love this topic

@williamoddo9199 3 жыл бұрын

Where are the good paint shops in the Midwest?

@jimcear1766 3 жыл бұрын

Good video. Plenty of filiform on outside stored Cessna aluminum elevators here in the northeast. Pipers as well. As you point to..trailing edge of control surfaces is common in my neighborhood. Keep the videos going . ABS is making progress for us V tail folks. I corrosion X my control surfaces internally as well . Good subject and advise .

@FlyWirescottperdue 3 жыл бұрын

Water is incredibly corrosive. What etching does is remove the oxidized layer, and the alodine basically seals it by leaving a very thin coating on the metal. The etching clears off the 'dead skin' and leaves a surface that promotes adhesion when you prime and paint. For plain aluminum the surface eventually is exposed to the elements and corrosion will follow, aluminum, steel or magnesium. Thanks for watching!

@matthewcampbell6890 3 жыл бұрын

Hi Flywire have tryed treating the magnesium with a process called magnesium dicromate. from working on the p&w r2000 engine the engine casing are made from magnesium and we treated the casing with this process before painting, it works the same way alodine does on aluminium.

@FlyWirescottperdue 3 жыл бұрын

Yep, alodine is a good process for Aluminum, but not Magnesium.

@richardseton7014 3 жыл бұрын

Hi Scott, have you ever looked at stray electrical current as the most significant contributor to galvanic corrosion.? Stray current contibutes to more than 98% of corrosion. There is a great product used in the marine industry, SeaBis. Cheap and Easy to use and it works. Check it out!

@FlyWirescottperdue 3 жыл бұрын

Richard, filiform corrosion is electrically based. In the airplane world, especially in the certified world, you have to use approved products.

@lexteakmialoki5544 2 жыл бұрын

Not a pilot, but just curious why no one makes those replacement skins. I guy would think there would be a huge demand.

@FlyWirescottperdue 2 жыл бұрын

Being a pilot has nothing to do with it. The folks that make magnesium parts just don't sell the stock to make these elevators/ruddervators these days.

@nunyabidness3075 3 жыл бұрын

Such beautiful aircraft. Why do you think no other solutions have yet come to market? Tort? FAA? Actually no one has a likely solution?

@FlyWirescottperdue 3 жыл бұрын

None- Well, there is a solution for the straight tails, STC'd aluminum replacements for the ailerons and the elevators. The V-Tail Ruddervators have much closer tolerances for balance which compounds the problem. There are a couple of folks working on a solution, but none is approved a of now.

@gorgly123 3 жыл бұрын

Could you explain in the future how the control surface(s) is balanced after painting.

@FlyWirescottperdue 3 жыл бұрын

Sure Jon. The MX manual specifies what procedure to use and it varies between models slightly. But basically you hang it by the fulcrum and adjust the balance weights in the nose of the control to within spec. Are you asking for a video on how that is done?

@gorgly123 3 жыл бұрын

@@FlyWirescottperdue Yes, I think that would be very informative.

@davidduganne5939 3 жыл бұрын

Isn't the balance mass in the triangular "horn" of the elevator? (Behind you, in most of the video)

@FlyWirescottperdue 3 жыл бұрын

For the F33C, the horn is the weight.

@Craneman4100w 3 жыл бұрын

And how likely are you to have or find this type of corrosion inside the flight controls?

@FlyWirescottperdue 3 жыл бұрын

Good question. A=From what I understand it is not as big an issue. The controls were originally dipped for the conversion coat. They weren't stripped and repainted like the outsides, Possible, but less likely.

@bobbycbob8842 3 жыл бұрын

Was wondering if you were going to change your platform from KZfaq to a alternative site in the future?

@FlyWirescottperdue 3 жыл бұрын

No plans to right now. We’ll see how things go.

@bobbycbob8842 3 жыл бұрын

@@FlyWirescottperdue Thanks for getting back to me. :)

@kewng3624 3 жыл бұрын

I have 2007 Bonanza - does it have magnesium control surfaces?

@FlyWirescottperdue 3 жыл бұрын

As far as I know it does. I haven't seen your logs.

@Nord3202 Жыл бұрын

On the older Bonanza's there are magnesium horns on the tail feathers and some on the nose gear fuselage mountings. The fuselage nose gear mountings are in the lower cowling where water collects.