Firebird2xc Posted August 21, 2017 Report Posted August 21, 2017 Perusing photos of used airplanes. See some light corrosion on an airplane. My anal military maintenance side wants to furiously scrub it all clean with an abrasive pad then drown it in CPC. My civilian pilot side says it's just outer plating corrosion and not to worry about it. I figured I'd let those here who are more knowledgeable help me... What's the score, Mooniacs?
N6758N Posted August 21, 2017 Report Posted August 21, 2017 38 minutes ago, Firebird2xc said: Perusing photos of used airplanes. See some light corrosion on an airplane. My anal military maintenance side wants to furiously scrub it all clean with an abrasive pad then drown it in CPC. My civilian pilot side says it's just outer plating corrosion and not to worry about it. I figured I'd let those here who are more knowledgeable help me... What's the score, Mooniacs? I'd be more concerned about all the crap sitting on the belly skins. 1
Andy95W Posted August 21, 2017 Report Posted August 21, 2017 Concerned? Yes. Worried? No, not yet. The trim tube that rotates is aluminum, that can be cleaned up pretty nicely and checked for corrosion. The actual pushrods for the elevator and rudder are steel and should be stripped, all rust removed (mechanically would be okay) and inspected to ensure that not more than 10% of the wall thickness was damaged or removed. Then prime and paint. And as Terry said, above, while you're back there removing your pushrods, crawl as far back as possible and clean the gunk out of the belly and check for corrosion on the aluminum skins and extruded aluminum longerons. When you're done with that, you can look in the belly at your next annual at your rusty control and landing gear pushrods there. Have fun. Attached are before and after of mine. 2
Firebird2xc Posted August 21, 2017 Author Report Posted August 21, 2017 The junk on the skin is also a little weird but I hadn't really noticed it before now. As for the rod corrosion, yeah, I see your point. Thanks guys.
Dream to fly Posted August 21, 2017 Report Posted August 21, 2017 59 minutes ago, Andy95W said: Concerned? Yes. Worried? No, not yet. The trim tube that rotates is aluminum, that can be cleaned up pretty nicely and checked for corrosion. The actual pushrods for the elevator and rudder are steel and should be stripped, all rust removed (mechanically would be okay) and inspected to ensure that not more than 10% of the wall thickness was damaged or removed. Then prime and paint. And as Terry said, above, while you're back there removing your pushrods, crawl as far back as possible and clean the gunk out of the belly and check for corrosion on the aluminum skins and extruded aluminum longerons. When you're done with that, you can look in the belly at your next annual at your rusty control and landing gear pushrods there. Have fun. Attached are before and after of mine. Not to sound stupid but how did you clean the skins, The wax on wax off way or did you use a machine?
Dream to fly Posted August 21, 2017 Report Posted August 21, 2017 31 minutes ago, bluehighwayflyer said: Wax on, wax off for us. Very time consuming and difficult to access, but surprisingly good results. Jim Scotch bright? or is there chemical spray
Guest Posted August 21, 2017 Report Posted August 21, 2017 3 hours ago, Firebird2xc said: Perusing photos of used airplanes. See some light corrosion on an airplane. My anal military maintenance side wants to furiously scrub it all clean with an abrasive pad then drown it in CPC. My civilian pilot side says it's just outer plating corrosion and not to worry about it. I figured I'd let those here who are more knowledgeable help me... What's the score, Mooniacs? It's a very common condition in Mooney airframes, they were primed but no top coated. Remove, clean, prime and paint as in Andy's pictures. The same issue exists with the steel cage. Clarence
Firebird2xc Posted August 21, 2017 Author Report Posted August 21, 2017 1 hour ago, M20Doc said: It's a very common condition in Mooney airframes, they were primed but no top coated. Remove, clean, prime and paint as in Andy's pictures. The same issue exists with the steel cage. Clarence Okay, good to know, thank you.
carusoam Posted August 22, 2017 Report Posted August 22, 2017 Keep in mind safety issues while sanding and cleaning are involved... Some of the anti-corrosion coatings are not good to inhale... Best regards, -a- 1
Andy95W Posted August 22, 2017 Report Posted August 22, 2017 3 hours ago, Dream to fly said: Not to sound stupid but how did you clean the skins, The wax on wax off way or did you use a machine? 3 hours ago, Dream to fly said: Scotch bright? or is there chemical spray Yup, Scotch Brite and a crap load of elbow grease. Lacquer thinner to remove old paint overspray and zinc chromate primer a previous owner had sprayed around the tail. I had a fan blowing fresh air through the tail so I didn't pass out. Finished it with CorrosionX. 2
bradp Posted August 22, 2017 Report Posted August 22, 2017 Your drain is likely stuck /clogged and you have had water sitting on the lowest point of the belly. 1
rbridges Posted August 22, 2017 Report Posted August 22, 2017 On 8/21/2017 at 6:35 PM, M20Doc said: It's a very common condition in Mooney airframes, they were primed but no top coated. Remove, clean, prime and paint as in Andy's pictures. The same issue exists with the steel cage. Clarence I noticed the same thing on my steel cage. very minor areas on the bottom side in a few sites. Did exactly as you said. 1
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