Antares Failure (One View). An Orbital ATK executive says "excessive bearing wear" in the turbopump of an Aerojet Rocketdyne engine, "main engine number one," (ME-1) is "most probably" the cause of the October Antares launch failure. Orbital ATK Flight Systems Group President Ron Grabe makes the remarks April 14 at the National Space Symposium in Colorado Springs, Colo. The preliminary finding is from Orbital ATK's own anomaly investigation, one of many being made into the launch failure. Aerojet Rocketdyne spokesman…
