When the Falcon 9 Block 5 rocket reaches Max-Q (maximum dynamic forces), the launch abort system of the Crew Dragon spacecraft will be triggered. This will fire up its SuperDraco engines and propel the spacecraft and its theoretical passengers away from the launch vehicle before landing back safely in the Atlantic Ocean. The goal of this test is to demonstrate the capacity of the spacecraft to ensure a safe return to the ground for the astronauts in the event of a launch vehicle failure. The booster for this launch will be B1046, a thrice-flown core which was the first of the Block 5 generation. It will not attempt to land and is expected to be destroyed by the SuperDracos and aerodynamic loads.

Falcon 9 is a two-stage rocket designed and manufactured by SpaceX for the reliable and safe transport of satellites and the Dragon spacecraft into orbit. The Block 5 variant is the fifth major interval aimed at improving upon the ability for rapid reusability.

Space Exploration Technologies Corp., known as SpaceX, is an American aerospace manufacturer and space transport services company headquartered in Hawthorne, California. It was founded in 2002 by entrepreneur Elon Musk with the goal of reducing space transportation costs and enabling the colonization of Mars. SpaceX operates from many pads, on the East Coast of the US they operate from SLC-40 at Cape Canaveral Space Force Station and historic LC-39A at Kennedy Space Center. They also operate from SLC-4E at Vandenberg Space Force Base, California, usually for polar launches. Another launch site is being developed at Boca Chica, Texas.

• Commercial Crew Program

  Human Spaceflight
  The Commercial Crew Program (CCP) is a human spaceflight program operated by NASA, in association with American aerospace manufacturers Boeing and SpaceX. The program conducts rotations between the expeditions of the International Space Station program, transporting crews to and from the International Space Station (ISS) aboard Boeing Starliner and SpaceX Crew Dragon capsules, in the first crewed orbital spaceflights operated by private companies.
  Program infoProgram wiki