In the typical spacecraft lifecycle, which stage focuses on assembling components, integrating subsystems, and verifying functions prior to launch?

In the typical spacecraft lifecycle, which stage focuses on assembling components, integrating subsystems, and verifying functions prior to launch?

• A. Concept
• B. Detailed Design
• C. Assembly/Integration/Test
• D. Disposal

Answer: (C)

The main concept being tested is the build-and-verify phase that happens just before launch, where you bring together all hardware, wire up and connect subsystems, and run formal checks to confirm the system works as a cohesive whole.

In this stage, assembling components means physically putting together the flight hardware into the final configuration. Integrating subsystems involves ensuring interfaces between power, avionics, communication, attitude control, payload, and other parts line up and operate together without conflicts. Verifying functions means conducting a rigorous suite of tests to prove that each function performs to spec, that the system meets performance requirements, and that it behaves correctly under expected conditions. This often includes environmental testing like vibration, thermal vacuum, and EMI/EMC tests to simulate launch and space environments.

This stage is distinct from the earlier concept and detailed design phases, which focus on planning, feasibility, and precise specifications, and from disposal, which is about end-of-life handling. The assembly/integration/test phase is where the actual build and validation happen to ensure readiness for flight.