REFLECTOR: AN washers

[HYTEC45 at aol.com]

In a message dated 10/15/2004 9:25:27 AM Pacific Standard Time, 
tmartino at troubleshooter.com writes:
Sharper endge goes down!  For the bite.
I hope this is meant as a joke, if so, in bad taste as others may think it 
true.

Robinson helicopter had a problem back in the 80's with the flex plates that 
connects the tail rotor output drive of the transmission to the drive shaft 
breaking.  This arraignment is a set of two thin (.062) plates that in effect 
work as a universal joint.  The sharp edge of the washer will act like a "cookie 
cutter" if put down,  putting a ring indent in the surface being held, 
causing a stress riser to focus stresses and causing the failures.  To make sure the 
correct edge (rounded edge) was put down in field repair, they machine there 
own -4 washers with radiuses on both sides to be used in this application.  
Even though an AN will work, to be airworthy, the Robinson part must be used.

TEC
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