"books about T5" The A & P General textbook by Jeppesen, that I used as an A & P instructor has the following to say about T5 and T6 "T5 Artificially aged after an elevated temperature, rapid -cool fabrication process such as extrusion or casting." "T6 Solution-heat-treated, followed by artificial aging (precipitation- heat-treated)."
It appears that T5 is usually part of the manufacturing process where T6 is or can be accomoplished at other times. Orma L. Robbins Southfield MI 19 Years flying KR-2 N110LR http://www.aviation-mechanics.com
