START08/pre-HIPPO RF07 Pre-HIPPO sampling with multiple missed approaches to the north Fridge trap inline, 48" U traps, 1/2" main trap Pollution plume before take-off 16:46:06 in 2000 ft/min descent, switched inlet to FWD (?) 17:54:16 switched inlet back to AFT Inlet as 1/4" Synflex with first pressure control in rack - pressure/surface effect on O2 4-way in AFT position