1987 May 15 - 17:30 GMT - Launch Vehicle: Energia. Energiya 6SL FAILURE: No orbital insertion due to failure of the FGB attitude control system (Energia performed perfectly). Partial Failure. Polyus Spacecraft: Polyus. Agency: UNKS. Due to delays in completion of the enormous static test facility at Baikonur, which could test the entire Energia vehicle stack, it was decided to launch the vehicle without the verification the tests would provide. The launch of 6SL was planned for 11 May 1987 at 21:30 Moscow time. It was delayed five days when a leak was detected in the Block 3A electrical distribution section, then by another hour due to a fault LH2 thermostat. The launch vehicle performed successfully, but the Polyus payload failed to inject itself into orbit due to a guidance system failure. Additional Details: Polyus(4878).