BOX 2-1 Safety Office Top 10 Hazards (August 1996)
The ISS program created all AIT to be responsible for meteoroid and orbital debris risk management. The meteoroid and orbital debris AIT members are responsible for all aspects of the problem, including modeling the environment, calculating the likelihood that debris or meteoroids will penetrate modules, performing hypervelocity impact tests, and designing and evaluating shields. The meteoroid and orbital debris AIT reports to the mechanical subsystems AIT, which reports to the systems integration AIT, which, in turn, reports to the vehicle IPT. Figure 2-2 shows this chain of command.
The meteoroid and orbital debris AIT strategic plan for risk management is to shield against particles up to about 1 cm in diameter, to maneuver to avoid collisions with objects larger than about 10 cm in diameter that can be tracked by ground-based sensors, and to implement procedures to mitigate the damaging effects of impacts with objects between about 1 and 10 cm in diameter. These three methods are discussed in detail in chapter 4, chapter 5, and chapter 6. Figure 2-3 illustrates this overall approach to managing the risk from meteoroids and debris.