A space-qualified laser transmitter has been developed for NASA''s Lidar In-Space Technology Experiment (LITE). It is a 10 Hz three color, flashlamp pumped, Q-switched neodymium: YAG system with second and third harmonic generators to produce doubled and tripled wavelengths of the fundamental wavelength of 1064 nm. Space qualification of the laser transmitter was accomplished through a combination of design, tests, analysis and production control processes. The LITE experiment has been manifested for STS 62 (Atlantis) to be flown in 1993. This paper presents the engineering aspect of the space qualification process. A companion paper addresses specific optical issues.