12/31/2023 0 Comments Space shuttle explosion 1986The steering system (thrust vector control) of the solid rocket booster responded to all commands and wind shear effects. These were immediately sensed and countered by the guidance, navigation and control system. The wind shear created forces on the vehicle with relatively large fluctuations. The black color and dense composition of the smoke puffs suggest that the grease, joint insulation and rubber O-rings in the joint seal were being burned and eroded by the hot propellant gases.Īt approximately 37 seconds, Challenger encountered the first of several high-altitude wind shear conditions, which lasted until about 64 seconds. The last smoke was seen above the field joint at 2.733 seconds. As the shuttle increased its upward velocity, it flew past the emerging and expanding smoke puffs. The multiple smoke puffs in this sequence occurred at about four times per second, approximating the frequency of the structural load dynamics and resultant joint flexing. While each smoke puff was being left behind by the upward flight of the shuttle, the next fresh puff could be seen near the level of the joint. The smoke appeared to puff upwards from the joint. The vaporized material streaming from the joint indicated there was not a complete sealing action within the joint.Įight more distinctive puffs of increasingly blacker smoke were recorded between. This area of the solid booster faces the external tank. Computer graphic analysis of the film from the pad cameras indicated the initial smoke came from the 270 to 310-degree sector of the circumference of the aft field joint of the right solid rocket booster. 678 seconds into the flight, photographic data shows a strong puff of gray smoke was spurting from the vicinity of the aft field joint on the right solid rocket booster. 28, 1986, was delayed two hours when a hardware interface module in the launch processing system, which monitors the fire detection system, failed during liquid hydrogen tanking procedures. During the delay, cross winds exceeded return-to-launch-site limits at KSC’s Shuttle Landing Facility. The fixture was sawed off and an attaching bolt drilled out before closeout was completed. The launch was delayed 24 hours again when the ground servicing equipment hatch closing fixture could not be removed from the orbiter hatch. Prediction of unacceptable weather at KSC led to the launch being rescheduled for 9:37 a.m. The launch postponed another day when launch processing was unable to meet the new morning liftoff time. To utilize Casablanca (not equipped for night landings) as alternate TAL site, T-zero was moved to a morning liftoff time. 25 because of bad weather at the transoceanic abort landing (TAL) site in Dakar, Senegal. The first shuttle liftoff scheduled from Pad B, STS-51L was beset by delays. Launch was originally set for 3:43 p.m.
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