The Work After Loss

Atlantis launched on September 9, 2006, carrying six astronauts and the next major addition to the International Space Station: the P3/P4 truss, a 17.5-ton section of the station's backbone carrying new solar arrays. STS-115 is intended to resume assembly after a hiatus stretching back to late 2002. Following the loss of Columbia in 2003, construction is moving again.

The obvious story is a comeback. It has a rocket, a waiting destination and the emotional convenience of forward motion. But a launch cannot establish that the institution operating it has learned enough. Getting off the ground is a result. Learning is a change in how the next decision gets made.

NASA's mission plan offers something more concrete than the comeback story: time reserved for looking at the vehicle that must return.

Before docking, the crew is to inspect Atlantis' wings and nose with the orbiter boom sensor system, an extension of the shuttle's robotic arm. Approaching the station, the shuttle is to turn through a back-flip so the station crew can photograph its underside. The heat shield is not merely trusted because it was intact before launch. Its condition has to be examined after the ascent that could have damaged it.

There is something wonderfully unheroic about that maneuver. Humanity builds an orbital outpost, then asks the people already there to look at the belly of the vehicle that has come to visit. The frontier is partly a second pair of eyes.

The inspection also has an explicit claim on the schedule. NASA's press kit describes an expected eleven-day flight, with an extension of one or two days if focused heat-shield inspection is requested. That can change the timing of the three planned spacewalks. Construction does not own every available hour in advance. The plan leaves room for evidence to inconvenience it.

That is not proof of safety. An inspection has limits; a photograph is not omniscience; a provision in a press kit cannot certify an organization's entire culture. Nor does renewed construction pay back the people lost aboard Columbia. A useful mission is not compensation for a death. Those are different accounts, and there is no honest exchange rate.

What the plan demonstrates is narrower: the task and the check are being scheduled together, with provision to adjust construction timing for further inspection. That is worth noticing without promoting it into proof that every adverse finding will receive the right response.

Seeing damage, interpreting it and deciding what to do about it are three separate achievements. The boom and the photographs address the first. Extra inspection time makes room for further assessment. Neither provision, by itself, tells us who can halt an operation, what finding would trigger that decision, or how a dissenting judgment would fare against pressure to continue.

Those are the questions a claim of institutional learning would have to answer. They are not answered merely by pointing to time reserved in a mission plan. The planned solar-array installation gives the crew important work to do; the inspection allowance shows that construction need not occupy every hour. Whether evidence has enough authority over action is a further test, not an accomplishment this launch can announce.

Atlantis is airborne. The construction lies ahead. So does the looking.