AO2: 23:23:~ Postponed cals until reached alt, set to 500 23:37:~ Reached level at 41Kft, calInt reset to 50. Now Purging. Performing Inlet Leak Test 01:48:30 Started blowing on inlet AO2CO2: 01:49:30 Stopped blowing on inlet 01:50:30 No sign of change MED: 23:00:~ Set prepurge to 150 seconds instead of 60 seconds because several flasks in box 109 (placed in positions 1-16) were slightly or fully open when the box was opened in NZ. 00:32:~ Testing inlet for possible leaks. Changed to byass. Results: 00:33:30 Started breathing MEDCO2=307 +/-1 (how terrifically accurate) 00:34:30:30 Stopped breathing MEDCO2=307 +/-1; (feeling rather light-headed) 00:35:30 Waiting for possible lag effect MEDDCO2=307 +/-1. 00:36:30 MEDCO2=307 +/-1 Wahoo!! No apparent leak, despite a full minute of oxygen-stripping breathing 00:40:~ Switched back from bypass to sample