A detailed timeline has been formulated to mesh with GCMS' own. It is based on the following sequences that ACP must operate during the descent phase.

• Sequence 1 : Initial venting and preparation for the first sampling operation between ACP initialisation (at To+l min 40 s) and the filter in its sampling position (at To+6 min 45 s, nominal altitude 130 km).

• Sequence 2 : First sampling in the low stratosphere. This period ends when the filter is retracted into the oven (GV locked) at To+60 min 00 s (nominal altitude 32 km).

• Sequence 3 : Heating the filter (ambient, 250°C, 600°C) and gas product transfers to GCMS at To+74 min 00 s (nominal altitude 24 km).

• Sequence 4 : Oven and transfer lines cleaning, and preparation for the second sampling operation with the filter in its sampling position at To+77 min 00 (nominal altitude 22 krn).

• Sequence 5 : Second sampling in the upper troposphere. This period ends when the filter is retracted into the closed oven, at To+89 min 00 (nominal altitude 17 km).

• Sequence 6 :Heating the filter (ambient, 250°C, 600°C) and gas product transfers to GCMS ends at To+108 min 00 s (nominal altitude 9 km).

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