START08/pre-HIPPO RF10 (AO2 failed on RF08 and was not on GV on RF09) Low approach at LEF (17:42) and Churchill (19:55) with tropopause sampling over Hudson Bay and enroute Fridge trap bypassed, 48" U traps, 1/2" main trap Pollution plume before take-off 17:35-45 Turbulence and noise 20:03:30 Switched inlet to FWD 20:08:30 Switched inlet to AFT 20:13:30 Switched inlet to FWD 20:18:30 Switched inlet to AFT 20:23:30 Switched inlet to FWD 20:28:30 Switched inlet to AFT 20:33:30 Switched inlet to FWD 20:38:30 Switched inlet to AFT 20:43:30 Switched inlet to FWD 23:36:20 WAS pumps off 23:47:30 and 23:48:30 QCR and QCF iced up - affect lag calc? Inlet as 1/4" Synflex with first pressure control in rack - pressure/surface effect on O2 4-way in AFT position