Rocket 3.3

Third Rocket 3 orbital launch attempt and first Rocket 3 commercial flight. Vehicle also known as Rocket 3.3, which became the standard configuration used for subsequent Rocket 3 launches. STP-27AD1 consisted of equipment attached to the upper stage to verify the rocket's performance during launch. Terminated at an altitude of approximately 50 km (31 mi) due to an engine failure at liftoff, which precluded the possibility of reaching orbit.