SECO stands for sustainer engine cutoff. It marks the commanded termination of thrust from the sustainer engine during a rocket's ascent. This event occurs once the vehicle has achieved its targeted velocity and trajectory, transitioning the payload into its coast phase or orbital insertion.
Heard on the job
Flight dynamics reports SECO is on time and the trajectory looks good for orbit.
Do not mix it up with
- MECO: MECO is main engine cutoff, while SECO refers specifically to the sustainer engine.