CHAPTER 16 DAY IN THE LIFE: IN-FLIGHT MAINTENANCE 268 Expedition 43 astronauts Scott Kelly (left) and Terry Virts perform in-flight maintenance on the Carbon Dioxide Removal Assembly. The inner workings of the device were removed from the rack in Node 3 and moved to the Japanese Experiment Module to provide a larger area in which the crew can work. A spacecraft as large, complex, and long-lived as the International Space Station (ISS) will clearly need to be maintained. This is especially true when considering that the first components of the ISS have been in space since 1998. ISS maintenance is the responsibility of both the crew and the flight control teams as part of day-to-day operations. Some components have limited lifetimes and need to be replaced or repaired on a periodic basis. Examples of equipment in this category include dust filters, batteries, experiment igniter tips, overhead lights, and various waste filters in the regenerative life support system. Other components need regular inspection to ensure they are still functioning, or are able to