Re: How much "rust" is tolerated and landing light question?

Date:         13 Oct 98 02:48:30 
From:         JF Mezei <jfmezei.spamnot@videotron.ca>
References:   1
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John S. Maddaus wrote:
> OK number one, flying UAL from Denver to San Antonio in an older 737S.
> First I noticed that the top (couldn't see the bottom) of both
> ailerons were nice shiny metal.  Thought that was an odd area to be
> replaced.

I flew once on an AA 727, and its exterior was a mismash of new and "old"
metal. Very visible.

>  Then as flaps were extended for take-off I noticed rust
> stains running back approximately in the middle of the flap.

I would speculate that what you saw was oil stains. (or de-icing fluid stains).