Launch, orbit, entry—and preparation to repeat

During ascent, the main engines and solid boosters accelerated the stack. After booster and tank separation, the orbiter used its orbital maneuvering and reaction-control systems for appropriate in-space tasks. The three large main engines were not the engines used to fly a powered approach to the runway.

Phase matters when interpreting a photograph. Engines visible at the back of a landed orbiter do not mean they were firing during its glide. To explain a maneuver, identify the system operating at that point rather than selecting the most conspicuous hardware.

A deorbit maneuver changed the trajectory so the orbiter reentered the atmosphere. Thermal protection—including tiles and reinforced carbon-carbon in high-heating regions—protected the vehicle. The orbiter then managed speed and altitude during an unpowered approach and landing. It did not have an airliner’s powered go-around option.

A glider can change its path and trade altitude for speed, but it cannot add energy with a runway-approach engine it does not have. This makes entry planning, weather assessment and energy management essential parts of the mission rather than details after orbital work is complete.

After landing, teams inspected, repaired and prepared the orbiter for another mission. Thermal-protection technicians checked and replaced tiles when necessary. Processing also involved engines, onboard systems, payload integration and many other tasks. A recovered vehicle was an asset requiring work, not an automatically launch-ready vehicle.

For an illustrative turnaround, suppose inspection takes four days and a required repair takes three more before integration can start. The seven days cannot be reduced to four by labeling the vehicle reusable. Actual mission schedules were much more complex; the example shows why reuse and rapid turnaround are different claims.