From the opening paragraphs:
This upgrade booklet is to be given out free to purchasers of Fire, Fusion & Steel: Traveller Technical Architecture. With the publication of FF&S, we have created design sequences which are much more comprehensive than those used when designing equipment for the Traveller: The New Era rulebook. All of this material will be incorporated into the TNE second printing, which can be recognized by the phrase "Mk I Mod 1 (December 1993) on its title page.
This 16 page booklet contains revised rules, errata, and redesigned weapons and vehicles for TNE, plus errata for FF&S.