Today, 11-16-01 Excerpts from Boston Globe
The carbon-fiber tail fin on the plane that crashed, known as the vertical stabilizer, snapped off just above six carbon loops that are used to attach the fin to the fuselage. The loops fit into metal sockets on the fuselage, and the connnection is secured with six titanium metal bolts.
The carbon fiber around one of the six loops on the tail fin was repaired during the plane's manufacturing in 1988, the NTSB said this week.
Investigators said the metal fittings and bolts held through the crash, but the vertical stabilizer snapped off on a line that runs across the carbon loops.