re: atlas5 launch and fuel dump?

From: Kevin Fetter (
Date: Tue Dec 14 2004 - 09:42:18 EST

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    It's ok
    I see in the tech info for the atlas centaur stage, the fuel dump is part of the Collision and
    Contamination Avoidance Maneuver (CCAM). 
    It say's
    Blowdown— As part of the CCAM, hydrogen and oxygen are
    expelled through the engine system to safe the vehicle and to further increase
    upper-stage/spacecraft separation distance. Hydrogen is expelled out the engine cooldown ducts and
    oxygen is expelled out the main engine bells.
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