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21-Oct-98 | Delta III failure investigation completed

The unexpected roll oscillation during the Delta III launch on 27-Aug-98 was the result of a single roll mode out of 56 in the control software. The mode caused the Thrust Vector Control motors to gimbal back and forth in unison, generating torque vectors which became significant at altitude as the rocket shed propellant mass. A bug fix in the software should have the Delta III ready for its scheduled return-to-flight in early 1999. Boeing press release

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