Just wanted to see?

Discussion in 'Maintenance Bay' started by Tom-D, Mar 20, 2017.

  1. Tom-D

    Tom-D Taxi to Parking

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    If I could do it :)
     

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  2. weirdjim

    weirdjim En-Route

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    Looks like some cat barfed on a casting. What are we looking at?

    Jim
     
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  3. GlennAB1

    GlennAB1 En-Route

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    Tom pushed a molten puddle around. Doesn't look too bad, actually. The piece still has corrosion though.
     
  4. Tom-D

    Tom-D Taxi to Parking

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    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 :)
     
  5. Tom-D

    Tom-D Taxi to Parking

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    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.
     
  6. GlennAB1

    GlennAB1 En-Route

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    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
     
  7. GlennAB1

    GlennAB1 En-Route

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    ********. 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.
     
  8. Tom-D

    Tom-D Taxi to Parking

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    no it doesn't, pitting left by removing corrosion isn't corrosion.
     
  9. GlennAB1

    GlennAB1 En-Route

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    Bull ****
     
  10. Tom-D

    Tom-D Taxi to Parking

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    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.
     
  11. Cooter

    Cooter Line Up and Wait

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    Quality entertainment! :)
     
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  12. GlennAB1

    GlennAB1 En-Route

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    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
    appearance.

    6-113. GENERAL.
    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
    replaced.
    b. If manufacturer information and
    limits are not available, then a DER must be
    consulted before the aircraft or part is returned
    to service.

    The surface byproducts may be gone, but; You still have pitting. You still have corrosion.
     
  13. Tom-D

    Tom-D Taxi to Parking

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    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 .
     
  14. GlennAB1

    GlennAB1 En-Route

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    Your work would get rejected here, if not by I, by one of 16 other Inspectors.
     
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  15. Tom-D

    Tom-D Taxi to Parking

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    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.
     
  16. GlennAB1

    GlennAB1 En-Route

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    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.
     
    Last edited: Mar 21, 2017
  17. Timbeck2

    Timbeck2 Pattern Altitude

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    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. :rolleyes:
     
  18. Bill Jennings

    Bill Jennings Final Approach

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    You got that half right!
     
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  19. Let'sgoflying!

    Let'sgoflying! Touchdown! Greaser!

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    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.
     
  20. zodiacflyguy

    zodiacflyguy Pre-Flight

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    Looks more like a product of a casting flaw and shadows
     
  21. GlennAB1

    GlennAB1 En-Route

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    Maybe, looks different on my phone than computer.
     
  22. zodiacflyguy

    zodiacflyguy Pre-Flight

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    Same here. on the PC, kinda looks like surface roughness.
     
  23. N659HB

    N659HB Line Up and Wait

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    Just curious, but with what does one weld magnesium?
     
  24. JAWS

    JAWS Pre-Flight

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    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! :)
     
    Last edited: Mar 22, 2017
  25. Checkout_my_Six

    Checkout_my_Six Final Approach

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    pits or inclusions are deformities.....that weaken the material and is disqualifying. :D


    btw Tom.....keep up with learning to weld. One day you'll get it.
     
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  26. Dan Thomas

    Dan Thomas En-Route

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    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:
    http://www.mcfarlane-aviation.com/Products/?ID=66454559&PartNumber=AP2000-01&

    Cessna's new pedals are plastic.
     
  27. CC268

    CC268 Cleared for Takeoff

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    Can I get a bunny with a pancake??? Amen amen!
     
  28. Jeff Cutler

    Jeff Cutler Pre-Flight

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    pass the popcorn...
     
  29. Timbeck2

    Timbeck2 Pattern Altitude

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    How 'bout above and below?

    [​IMG]
     
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  30. Timbeck2

    Timbeck2 Pattern Altitude

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    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. ;)
     
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  31. CC268

    CC268 Cleared for Takeoff

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    I don't even know what it means i just wanted to say it
     
  32. PaulS

    PaulS Final Approach

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  33. Justin M

    Justin M Pre-Flight

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    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.
     
  34. Matthew

    Matthew Touchdown! Greaser!

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  35. James331

    James331 Touchdown! Greaser!

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  36. Capt. Geoffrey Thorpe

    Capt. Geoffrey Thorpe Final Approach

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    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.
     
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  37. JAWS

    JAWS Pre-Flight

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    Cast what? Aluminum? Magnesium? Cat barf? (I liked that one) :)
    Integral part of a primary flight control system, plus braking.
     
  38. Timbeck2

    Timbeck2 Pattern Altitude

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    Um....yer kiddin' right? ;)
     
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  39. weirdjim

    weirdjim En-Route

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    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.

    Jim
     
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  40. jesse

    jesse Administrator Management Council Member

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    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.
     
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