Look up Europa Ice Clipper
http://www.astrobiology.com/europa/clipper/d234.science.html
I can't remember why it was rejected, but I'll bet it was considered too risky/unlikely to meet budget constraints.
Space/Science » in reply to LCROSS a model for a Europa mission?
http://www.astrobiology.com/europa/clipper/d234.science.html
I can't remember why it was rejected, but I'll bet it was considered too risky/unlikely to meet budget constraints.