Sequence 1
During sequence 1, after the high entry velocity has been reduced and the Probe's protective front shield has been jettisoned -eliminating the risk of contamination from the front shield- the following operations begin at To+1 min 40 s.
P3 is opened, and flushing and venting the internal circuit begins by filling the circuit with N2 through V1 and V2 down to P1 (GV is closed). Venting is obtained by opening VT. The whole process is repeated after opening valve P1.
The mechanism for ejecting the sealing cover (SC) is then activated, and in-flight calibration of the oven pressure sensor (PS) is performed to compensate for any offset accumulated during cruise. GV is then opened and the filter is moved into its sampling position.
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