A method and article of manufacture of joining a stringer to a wing or
tail panel and curing a wing or tail panel is disclosed. A sheet of
titanium is placed between a cured stringer and an uncured wing or tail
panel. The stringer, wing or tail panel and sheet are then placed within
a vacuum bag, and gas is pumped out of the bag. The bag is then placed in
an auto-clave to cure the wing or tail panel.