CHAPTER 20 DAY IN THE LIFE: WHEN MAJOR ANOMALIES OCCUR 376 substance that would turn from yellow to blue in the presence of ammonia. The test turned out to be negative—no ammonia was present. During repress of the airlock, Mastracchio’s communication cap lost audio in the right ear, giving the team even more to discuss. The EVA ended up lasting 7 hours and 29 minutes, about an hour longer than was planned, but with an incredibly successful installation of a new Pump Module. The degraded Pump Module was left out on the truss, where it could remain for several months (Figure 13). Figure 15. The ISS flight controllers during the second spacewalk to repair the faulty Pump Module. From left to right: SPARTAN Flight Controller Bill Kowalczyk, the NASA videographer, Capcoms Aki Hoshide and Doug Wheelock, Flight Director Dina Contella, BioMedical Engineer Lawrence Baitland, and Lead US EVA Officer Allison Bolinger, with John Mularski assisting. On the far right: Norman Knight, chief of the flight director’s office. The ground team began activation of the new Pump Module and confirmed that it was working. The ground team told the crew of the successful results—the CAPCOM told them, “It’s the best Christmas ever!” Smiles and handshakes were exchanged among the proud and exhausted teammates. For many of those who had been working the EVAs, Christmas was certainly going to be a happy day off. Tuesday, Dec 25, 2013, and Beyond A lot of work remained to be done to bring the entire loop back up to full functionality. The ammonia loop was at a lower pressure than nominal, and it would take quite some time to bring it back to normal pressure. Christmas was not a day of rest. Many intricate procedure details had been worked out in terms of adding nitrogen to part of the system to increase the pressure of the ammonia (see Chapter 11), and the issue with the Columbus heat exchanger