Same lore is extant in auto racing...machinists avoid using pencil or
other sharp marking tools to mark for cutting, sheet metal, or structural
tubing...check with Dave Leeson, who used to race....
73, DX, de Pat, AA6EG/N6IJ;
aa6eg@hh.tmx.com
599 DX Drive, Marina CA 93933
"The Contest Station from the Government"
On Thu, 31 Dec 1998, Bill Aycock wrote:
>
> I could be wrong- but I think this may be folklore. I would like to see a
> reference to an accident report, or other documentation, about the
> phenomenon. Pencil lead is primarily a mix of graphite and clay, fired to
> high temperature, and has nothing to promote corrosion.
>
> can someone cite a source? Considering the amount of aluminum some members
> of this list have in the air, this needs checking.
>
> Bill- W4BSG
>
>
> tA 10:38 PM 12/30/1998 -0500, you wrote:
> >
> >Ron Stone's post reminded me of something that I remember from flying.
> >Never use a lead pencil to draw lines or reference marks on aluminum.
> >The pencil lead will cause the aluminum to corrode and weaken the metal.
> >
> >Several emergency landing were traced back to someone using a pencil to
> >marking a paint line on the prop tips. The tips separated in flight and
> >caused the engine to have to be shut down due to vibration.
> >
> >This is not to say that Ron did this. It just reminded me of times I
> >stopped someone from marking the element with a pencil to show how far
> >in the elements are supposed to be inserted.
> >
> >Sorry for the space just might help someone else later.
> >
> >Steve
> >KD4WIW
> >
> >==========================================
> >E-mail: kd4wiw@iass.net
> >Home Page: http://www.ipass.net/~kd4wiw/
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> >==========================================
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> >==========================================
> >
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> >
> >
> -
> Bill Aycock --- Persimmon Hill
> Woodville, Alabama, US 35776
> (in the N.E. corner of the State)
> W4BSG -- Grid EM64vr
> baycock@HiWAAY.net
>
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