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SpaceFlight:
Ariane 5 rocket on its 25th launch |
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| Geplaatst door: KJ van Til op 24-12-05 23:07 |
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European Ariane 5 rocket launches on its 25th flight WEDNESDAY, DECEMBER 21, 2005 Spaceflight Now Two satellites were shot into space by an Ariane 5 rocket Wednesday from a South American spaceport to begin missions supporting Indian telecommunications operators and European weather forecasters. Brief timeline overview: Minus-3 minutes. The scheduled launch time has been loaded into the rocket's main computer system. The main stage tank pressures should now be at flight level. Minus-2 minutes. The Vulcain 1 main engine supply valves are being opened. Also, the ground valves for engine chilldown are being closed. Minus-1 minute. A fast-paced series of events leading to launch will begin at Minus-37 seconds when the automated ignition sequence is started. The water suppression system at the launch pad will start at Minus-30 seconds. At Minus-22 seconds, overall control will be given to the onboard computer. The Vulcain main engine will be readied for ignition with hydrogen chilldown starting at Minus-18 seconds. The residual hydrogen burn flares will fire beneath the Vulcain engine at Minus-6 seconds to burn away any free hydrogen gas. At Minus-3 seconds, onboard systems take over and the two inertial guidance systems go to flight mode. Vulcain main engine ignition occurs at Minus-0 seconds with checkout between Plus+4 and 7 seconds. If there are no problems found, the solid rocket boosters are ignited at Plus+7.0 seconds for liftoff at Plus+7.3 seconds. |
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