AKA: 19.4-KS-3,600;TE-M-521-5. Status: In Production. Number: 19 . Thrust: 16.01 kN (3,600 lbf). Gross mass: 126 kg (277 lb). Unfuelled mass: 14 kg (30 lb). Specific impulse: 287 s. Burn time: 19 s. Height: 0.98 m (3.21 ft). Diameter: 0.44 m (1.46 ft).
Apogee kick motor. Modifications: 175 mm straight section added to the Star 17. The 17A has been used for circularized orbits for the Skynet 1, NATO 1, and IMP-H & J satellites. This motor provides the high case safety factor required for this program. The TE-M-521-7 model used for several Air Force missions provides a typical safety factor with a 1.3 pound weight savings. Total impulse 32,556 kgf-s. Propellant mass fraction 0.89.