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2 Tailcone Questions: F-1012B came unpunched, small tear in

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AV8ORJWC

Joined: 13 Jul 2006
Posts: 1149
Location: Aurora, Oregon "Home of VANS"

Posted: Mon Nov 27, 2006 10:46 am Post subject: 2 Tailcone Questions: F-1012B came unpunched, small tear in

Removing the obvious (the visible crack) does not remove the adjacent

induced stress which is yet to propagate.  Many who have stop drilled

learn that lesson with time on their airframe after a perceived patch

was signed off.  You are only cheating the inevitable. Metal has memory,

it does not forget.  You are not going to fool it into long term

submission.  We resort to Eddy Current and Ultrasonic more often that

people know with our air carrier aircraft.



The use of polarizing lens while watching the bending, drilling or

cutting of Plexiglas/acrylic panel is a real eye opener if you can

excuse the pun.  The stresses can go wild.  You can watch with dazzling

amazement at the exact moment just before the crack destroys the final

piece.



Replacing it with one (F-1010)that has not been manipulated or masked is

the "No brainer". You can consider it the Golden Panel too. Dip it in

alodine like Tim did and then tell stories about it in hangars, years

from now.



John Cox

#40600

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