A cryogenic Michelson Fourier transform interferometer-spectrometer (FTIR) was built and flown as part of the second Spatial sPectral Infrared Rocketborne Interferometer Telescope (SPIRIT II) payload. The flex-pivot mirror-translation interferometer was designed to obtain spectral data from 2 to 28 micrometers. Two different scan rates and resolutions were provided: 10 cm-1 at 2 seconds per scan, and 2 cm-1 at 10 seconds per scan. A laser reference channel was run antiparallel to the main channel to provide sampling information. The system was calibrated using an infrared calibration system built specifically for SPIRIT II. The payload was launched from the University of Alaska's Poker Flat Research Range on March 28, 1992, and successfully collected auroral emissions data.