Data are presented on the flammability and autoignition temperature characteristics of JP-6, JP-150 and HTF-59-24 fuels. Flammability limits of the vapors of these fuels were determined in air at elevated temperatures and at atmospheric pressure. Auto-ignition temperatures and corresponding ignition delay times were obtained under static and dynamic conditions as a function of the pressure and the oxygen concentration of the ambient medium; the effect of fuel volume on auto-ignition was also determined in static tests. The auto-ignition of JP-6 fuel vaporoxygen-nitrogen mixtures was studied in various vessels which were heated uniformly and nonuniformly; critical heat flow requirements for auto-ignition were found for spherical and cylindrical Cu vessels and a spherical stainless steel vessel. (Author).