page_title: IRNSS-1H
section_title: Launch
hierarchical_section_title: IRNSS-1H / Launch
caption_attribution_description: English: PSLV Heat Shield Model at HAL Aerospace Museum in Bengaluru
context_page_description: IRNSS-1H was the eighth in the Indian Regional Navigational Satellite System series of satellites, after IRNSS-1A, IRNSS-1B, IRNSS-1C, IRNSS-1D, IRNSS-1E, IRNSS-1F and IRNSS-1G. It was lost in the launch failure of PSLV-C39 on August 31, 2017.
context_section_description: PSLV-C39 carrying IRNSS-1H was using XL variant of Polar Satellite Launch Vehicle on its forty-first flight. Launch occurred as scheduled at 19:00 IST or 13:30 UTC, 31 August 2017 from Second Launch Pad of SDSC (SHAR) aiming for orbit of 284 × 20,650 km (Sub GTO) with 19.2° inclination. Vehicle performed initial flight sequences as planned but 203 seconds into flight, the payload fairing jettison event was not accomplished. Excluding this mid-flight malfunction, rest of the planned flight sequences including spacecraft separation at 17 minutes and 56 seconds occurred nominally but due to extra 1182 kg mass of fairing, target orbit could not be achieved leaving the combined assembly of PSLV upper-stage (PS4), enclosed payload fairing and trapped IRNSS-1H spacecraft in 167.4 × 6554.8 km orbit with 19.18° inclination. Liquid Apogee Motor (LAM) of IRNSS-1H was fired to help it come out of the payload fairing and to consume the propellants and passivate the spacecraft.
  Prior to PSLV C39 / IRNSS-1H, last launch failure involving a PSLV happened 24 years ago in 1993, following which many variants of PSLV rockets have had 39 successful launches.
caption: PSLV payload fairing or heatshield
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