sentences:  The first of these launches in January 1984 was a failure when the second burn of the hydrogen fuelled cryogenic third stage engine, intended to boost the satellite from low earth orbit into a geostationary transfer orbit, failed.However, despite being stranded in low earth orbit, available telemetry indicated that the satellite itself was sound.The launch of the second test satellite was brought forward to April 1984, and this time both launch vehicle and satellite functioned as intended.