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Discussion in 'Maintenance Bay' started by Tom-D, Mar 20, 2017.
If I could do it
Looks like some cat barfed on a casting. What are we looking at?
Tom pushed a molten puddle around. Doesn't look too bad, actually. The piece still has corrosion though.
You are looking at where a hole used o be.
it will get milled down flat and the hole re-drilled some time in the future.
Some body said you would have to be a very talented welder to weld the part.
I'm like OK
No it doesn't. it's all gone.
You said it was just like any other mag corrosion you have see all these 33 years. Now Im wondering what you were seeing all these years.
and they allow you to work on airliners, It's amazing how little you can know and still work as a repairman.
Looks can be deceiving. Welds should have a smooth transition to the base metal. I doubt you have adequate penetration for the thickness you are dealing with, show the other side. Yeah, I know what I'm talking about. I got an A in welding
********. There's still pitting on the part at the upper left edge of the picture. Pitting means there's still corrosion. Don't believe? Read your 43.13.
no it doesn't, pitting left by removing corrosion isn't corrosion.
How dumb can you be? Have you ever read any thing on how to clean corrosion from anything. When you have clean metal you don't have corrosion.
Yes it is that simple.
Try reading 43.13
6-13. PITTING CORROSION. Pitting
corrosion is one of the most destructive and
intense forms of corrosion. It can occur in any
metal but is most common on metals that form
protective oxide films, such as aluminum and
magnesium alloys. It is first noticeable as a
white or gray powdery deposit, similar to dust,
which blotches the surface. When the deposit
is cleaned away, tiny holes or pits can be seen
in the surface. (See figures 6-5(a) and 6-5(b).)
These small surface openings may penetrate
deeply into structural members and cause
damage completely out of proportion to its surface
a. Repair of corrosion damage includes
removal of all corrosion and corrosion products.
When the corrosion damage is severe
and exceeds the damage limits set by the aircraft
or parts manufacturer, the part must be
b. If manufacturer information and
limits are not available, then a DER must be
consulted before the aircraft or part is returned
The surface byproducts may be gone, but; You still have pitting. You still have corrosion.
NO,, if you believe that you know absolutely nothing about corrosion, it's removal, or its treatment. Clean metal, no matter the shape, is still clean metal. Then you treat the area, to stop the corrosion from returning. then protect the area as required.
Your statement just proved you can't read and understand .
Your work would get rejected here, if not by I, by one of 16 other Inspectors.
You work under different rules, but Mother Nature doesn't. What you didn't understand in the 43,13 about pitting corrosion is the difference between pitting corrosion, and the pits left by it.
That pedal possibly has a crack coming out of a pit, too (stress riser). Zoom in on the outside bend radius, up and to the left of the weld, in the picture.
Good luck, Tom.
Holy crap fellas. It's a rudder pedal for a Cessna, not part of an oxygen system for the space shuttle. Grind it down, re-drill a hole, install bushing, powder coat it and install. I'LL fly it.
You got that half right!
Worse than high school. Elementary school tactics. Sadly, all partaking probably have a fount of useful knowledge they could impart to us on other topics if they would stop wrastling.
Looks more like a product of a casting flaw and shadows
Maybe, looks different on my phone than computer.
Same here. on the PC, kinda looks like surface roughness.
Just curious, but with what does one weld magnesium?
Cessna says the correct part number is cast magnesium (they should know). The picture of a supposed bead blasted and alodined pedal looks dark grey, just like magnesium looks like when in contact with alodine. Aluminum would look brassy yellow. Close up the material looks porous, just like cast magnesium tends to look. The weld was described as "cat barfed on a casting" - not sure that is in AC43.13 Chp 4.
I tried helping but was ignored or attacked - can't help the unwilling. I wished Tom good luck. Looking forward to what the bunny has on his head next!
pits or inclusions are deformities.....that weaken the material and is disqualifying.
btw Tom.....keep up with learning to weld. One day you'll get it.
McFarlane rebushes those holes, as long as they aren't worn past 7/16" at the widest point. They also make new aluminum pedals, with bushings:
Cessna's new pedals are plastic.
Can I get a bunny with a pancake??? Amen amen!
pass the popcorn...
How 'bout above and below?
Just so ya know, that's MY thang. People have their thang like 6PC with his videos, Denver with his succinct posting habits, Nauga with his esoteric sign off lines, etc, etc.
I don't even know what it means i just wanted to say it
Pancakes are readily available. Where do you get the bunnies? I haven't tracked, are the bunnies part of a collection you have at home?
Also, I wish the plural of bunny was bunnys, not bunnies. But I can't always get what I want.
There's the correct answer.
Tom, are you going to install your welded pedal back into the plane?
Are you planning on selling the plane?
They are cast Cessna rudder pedals fer crying out loud. It ain't like they are going anywhere.
Now, if it were MY airplane, I would consider these the better repair option, but that's me.
Cast what? Aluminum? Magnesium? Cat barf? (I liked that one)
Integral part of a primary flight control system, plus braking.
Um....yer kiddin' right?
The problem is that Glenn comes from the world of airline maintenance and Tom (and I) come from the world of spit-and-lickit elderly aircraft fixit. We work from different ends of the maintenance spectrum.
Glenn and I have had some really serious debates. Tom and I the same. We all just need to cool down and recognize that the procedures (NOT the safety criteria) for a 1930 Porterfield and a CanJet are diametrically opposed.
Cool it off, folks, and don't expect me to maintain your pocket rocket the same way (but to the SAME safety standards) as my Gull Wing Stinson.
I'd fly it. I've certainly flown behind a hell of a lot worse repairs made by a hell of a lot worse mechanic (myself). I'd be pretty pleased if anything came out of a shop around my parts with the quality of work done on it that Tom does.