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
>
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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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