Atlas-Able vehicle 91 launched Pioneer P-31/Able 5B on 15 December 1960. The Able upper stage ignited prematurely while the Atlas was still firing, and the launch vehicle exploded about 74 seconds after liftoff on the final Atlas-Able mission.
Atlas-Able vehicle 91 launched Pioneer P-31/Able 5B on 15 December 1960. The Able upper stage ignited prematurely while the Atlas was still firing, and the launch vehicle exploded about 74 seconds after liftoff on the final Atlas-Able mission.