START08/pre-HIPPO RF14 Tropopause and convective outflow sampling with one low approach near start of flight Fridge trap bypassed, 24" U traps, 1/2" main trap 21:06:14 Turbulence 170.81-170.86 high O2 noise related to cell flow dynamics Inlet as 1/8" stainless steel with first pressure control at inlet bulkhead 4-way in AFT position