START08/pre-HIPPO RF17 Tropopause survey, maneuvers, and DC8 intercomparison Fridge trap bypassed, 24" U traps, 1/2" main trap 17:29 starting speed run 18:09 starting pitch maneuver 19:49 starting 15-min w/DC8 20:05 breaking formation w/DC8 21:25 starting speed run 21:35-42 speed run Inlet as 1/8" stainless steel with first pressure control at inlet bulkhead 4-way in AFT position