21:53:36 Canceled third cal since cals were started 15 mins late, and taxiing started slightly early. Went to Manual Control to get start of ascent 22:05 Forced cal by setting Cal Int to 1 to start the third cal with WT. 22:23 Started doing HS cal even though Cal Int was se tot 50 while the last cal was going. Went to Manual Control, Select to SA, stop Purge LS. 22:31:30 AO2 Inlet breath test for 30 sec. 23:12 Return to Auto Control to resume normal cal sequencing. 50/3.0/3/4. 23:27:00 until 23:28:00 MEDUSA breath test 0:11:30 AO2 crashed. Stopped program. Closed window. Started up again. Set all 248's to control. Relit lamp. 00:15:30 Pretty stable again. Told pilots OK to descend. 00:26 Noticed O2 signal had shifted a bunch and that O2 noise was way good, , <1.0 00:31:00 Discovered changeover still disabled. Enabled and signal returns to normal. 00:41 Discovered never "Start"ed, so no data being saved. Started again. 00:42 Anne had troubles closing #16 MEDUSA flask. Both valves wound up pulling the glass piece out of the flask and had to monkey with the plastic handles to get the threads to catch correctly. She says the upper one came out further. 01:44 Cal started just before leveling out high, so took Manual Control Selected SA, turned off SA purge (no other purges) 01:49 Back to Automatic Control, set Cal Int to 1 to get cal started, then back to 50. 02:50 Asked for an extra minute down low to get a bit of the bottom leg 03:23:00 - 03:23:52 AO2 Inlet breath test