Definition
A SpaceX launch procedure where astronauts board the spacecraft before the rocket is fueled with Propellant Densification, reversing the 50-year NASA tradition of fueling before crew boarding.
Why It Matters
Load-and-go fueling represents a radical optimization of the launch window, but it introduces extreme sensitivity to thermal shifts; mismanaging this process turns a high-performance feature into a catastrophic failure point.
Core Concepts
- Strategic Driver: Super-chilled liquid oxygen (–340°F) is extremely thermally unstable. It must be loaded as close to liftoff as possible to maintain its density.
- The Controversy: NASA’s safety panels (Thomas Stafford, Joseph Dyer) initially viewed fueling with crew onboard as “reckless,” especially after the AMOS-6 Explosion proved that the rocket can explode during fueling.
- The Escape Net: SpaceX argued that the Crew Dragon’s escape system (SuperDraco Thrusters) was designed to pull the crew away from the rocket at any moment during the count, providing a better safety margin than heritage systems.
- Validation: NASA only approved the procedure after SpaceX completed 50+ successful launches using the exact same “load-and-go” sequence with uncrewed Falcon 9s.