Fire, Fusion, & Steel, Technical Architecture, is a supplement for Traveller: The New Era. This 160 page sourcebook is the technical architecture manual for designing major items of equipment. The first part presents rules for designing major systems such as spacecraft, ground vehicles, lift vehicles, and aircraft. The second part presents rules for designing subsystems such as personal armor, drives, controls, electronics, defensive systems, power production, lifters, life support, cybernetics, teleportation, and fire control. The third part presents rules for designing weaponry. An appendix provides design examples.