1. Philae Science team meeting 1. Criticality of SDL 2. Activity with Orbiter P/L ongoing 3. Activity with RMOC started 4. Still pending (wrt RMOC): ● release altitude ● orbiter trajectory (wrt visibility) ● visibility duration (descent) ● visibility duration (touchdown) ● “regulator” issue 5. Still pending (wrt Philae) ● main purpose of thjs meeting ● robustness optimized ● risks minimized ● issue 1: closed loops ● issue 2: ● “regulator” issue SDL sequence: the LS standpoint Venezia, March 30, 31, April 1, 2009 Palazzo Cavalli Franchetti

2. Philae Science team meeting 5. Still pending (wrt Philae) ● pre-release tasks: - what - when (wrt power source) ● release strategy - what triggers? - ejection velocity - nominal/emergency scenario if nominal fails, emergency viable ? MSS parameter analysis? abort or time out emergency? ● descent strategy - what systems: ADS, FW… - what P/L (RF, visibility, MM) ● touch-down strategy - which triggers? - what systems / PL SDL sequence: the LS standpoint Venezia, March 30, 31, April 1, 2009 Palazzo Cavalli Franchetti

3. Philae Science team meeting Risk mitigation ● identify and minimize signal trigger driven decision loops - nominal to emergency ejection - TD event risk of false pre-TD detection risk of no TD detection (soft) risk of CDMS reboot risk of CDMS over-switch ● mission analysis critical - to assess parameters - to assess timeline (timeouts) ● all involved SDL sequence: the LS standpoint Venezia, March 30, 31, April 1, 2009 Palazzo Cavalli Franchetti