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At 10:17 PM 12/5/02 -0500, Jeffrey Gacek wrote:
>But my questions are these:
>
>1) With the swiss cheese Ad, are mechanics able to tell definitively that
>wings are free of corrosion?
Probably not, Jeff. Just not enough visibility to all areas. The bigger
exfoliation-on-the-caps will show up when it is to extensive to be safe.
Otherwise, you should uncover the wings every ten years or so, like I
did in 2001.
>2) I understand that moisture can be a huge contributor to corrosion but
>that even dry climate planes can have corrosion caused by a inferior
>aluminum in the center spar and how they cooled the aluminum at the
factory
>in the 40's. How common is this type of corrosion?
Not very. It's kinda a binary variable in that if you do not have it,
you're not
going to get it.
>3) If a plane were to have corrosion in one area of the plane, would it
mean
>that it would probably be in other areas too?
But maybe not. Example: Rats in one wing due to not lapping the fabric
over the end. Obviously, their piddle has rotted the one spar out and
most
of the ribs, but they could not get into the other wing.
>4) I'm sure corrosion comes in many different degrees. Is it always black
>and white whether the corrosion is treatable or not and is there a
standard
>for judging that or is it just up to the opinion of the mechanic?
I believe there is a standard: AC-43. Correct me, Syd!
>5) To adequately check the center spar, how much time should it take to
>remove and reinstall the wings? How much time should it take to remove
and
>reinstall the interior floorboards? If you remove the wings and the
interior
>floorboards, will you be able to see enough to determine the condition of
>the entire center spar?
In turn. Remove and install wings should be no more than a day, but takes
two persons. Floor boards in and out are another day with a real adgile
person.
Again, an adgile person is needed. Some can see enough with just the
wings
removed.
It is always better to treat before hand rather than correct later.
That's why
I took the wrench up on his treatement offer during the last annual.
Percy in Portland
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