![]() ![]() The orbiter is Discovery, stacked for STS-124. Here's a picture I took of a ROFI at the pad on May 8 2008. T - Launch Countdown Time (T=0 is the time of launch).Split-second events are monitored by the Shuttle's four primary flight Required 90 percent, SRB ignition sequence starts. At T minus 3 seconds, if the engines are at the Walk beneath a massive Saturn V moon rocket. Opening of valves which allow the liquid hydrogen and oxygen to flowĪt T minus 6.6 seconds, the three main engines are ignited at Tour NASAs launch headquarters, and see space shuttle launch pads from a four-story observation deck. 2-Day Admission Ticket Visit for as low as 45 per day and experience everything at the visitor complex Save with a 2-Day Admission Ticket, and return for a second time within 6 months. A half second later, the flight computers order the 2023 is a busy year for spaceflight and exploration enthusiasts with countless launches, mission milestones and skywatching events to look forward to. Gaseous hydrogen that may have collected in the vicinity of the mainĮngine nozzles. (The GLS retains the capability to command mainĮngine stop until just before the SRBs are ignited.) At this timeįlares are ignited under the main engines to burn away any residual ![]() To serve this purpose the igniters are fired shortly before the SSME ignition sequence begins.Īt T minus 10 seconds, the "go for main engine start" command is The purpose of the sparklers is to prevent the accumulation of explosive amounts of the vapors by burning them off. by veteran Space Shuttle Commander and NASA Administrator Charlie Bolden. The startup sequence of the Space Shuttle Main Engines (SSMEs) causes them to emit gaseous hydrogen immediately prior to ignition. From the lawn of the NASA Causeway, enjoy an up-close view of the launch pads. The sparks are emitted by pyrotechnic devices called technically Radial Outward Firing Igniters (ROFIs) and colloquially "sparklers". ![]()
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