The second failure of a Russian heavy Proton booster in four months is raising new questions about quality control in the Khrunichev program that is critical to both joint U.S./Russian commercial launch operations and the International Space Station project. The latest failure on Oct. 27--like another failure on July 5--occurred in the vehicle's 520,000-lb.-thrust second stage. It continues the string of major launch accidents that have struck both the U.S. and Russian space programs ...

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