AFT Policy Brief Number 17 Demographic Trends Despite the fact that information on the Latino population is largely collected and analyzed in aggregate form and the Latino population is portrayed as a monolith, with English language learners as its only subgroup, the Latino population is actually quite heterogeneous.
NASA Challenger's lower deck left to right: Launch was set for 3: Launch was reset for Jan. To utilize Casablanca not equipped for night landings as alternate TAL site, T-zero was moved to a morning liftoff time.
The launch postponed another day High school dropouts reflection launch processing was unable to meet the new morning liftoff time. Prediction of unacceptable weather at KSC led to the launch being rescheduled for 9: The launch was delayed 24 hours again when the ground servicing equipment hatch closing fixture could not be removed from the orbiter hatch.
The fixture was sawed off and an attaching bolt drilled out before closeout was completed. Just after liftoff at. Computer graphic analysis of the film from the pad cameras indicated the initial smoke came from the to degree sector of the circumference of the aft field joint of the right solid rocket booster.
This area of the solid booster faces the external tank. The vaporized material streaming from the joint indicated there was not a complete sealing action within the joint.
Eight more distinctive puffs of increasingly blacker smoke were recorded between. The smoke appeared to puff upwards from the joint.
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 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.
As the shuttle increased its upward velocity, it flew past the emerging and expanding smoke puffs. The last smoke was seen above the field joint at 2. Signs of black smoke during Liftoff of the Shuttle Challenger STS L 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.
At approximately 37 seconds, Challenger encountered the first of several high-altitude wind shear conditions, which lasted until about 64 seconds. The wind shear created forces on the vehicle with relatively large fluctuations. These were immediately sensed and countered by the guidance, navigation and control system.
The steering system thrust vector control of the solid rocket booster responded to all commands and wind shear effects. The wind shear caused the steering system to be more active than on any previous flight. Both the shuttle main engines and the solid rockets operated at reduced thrust approaching and passing through the area of maximum dynamic pressure of pounds per square foot.
The main engines had been throttled up to percent thrust and the solid rocket boosters were increasing their thrust when the first flickering flame appeared on the right solid rocket booster in the area of the aft field joint.
This first very small flame was detected on image enhanced film at It appeared to originate at about degrees around the booster circumference at or near the aft field joint. One film frame later from the same camera, the flame was visible without image enhancement.
It grew into a continuous, well-defined plume at At about the same time 60 secondstelemetry showed a pressure differential between the chamber pressures in the right and left boosters. The right booster chamber pressure was lower, confirming the growing leak in the area of the field joint.
As the flame plume increased in size, it was deflected rearward by the aerodynamic slipstream and circumferentially by the protruding structure of the upper ring attaching the booster to the external tank. These deflections directed the flame plume onto the surface of the external tank.
This sequence of flame spreading is confirmed by analysis of the recovered wreckage. The growing flame also impinged on the strut attaching the solid rocket booster to the external tank. The first visual indication that swirling flame from the right solid rocket booster breached the external tank was at This indicated that it was mixing with leaking hydrogen from the external tank.
Telemetered changes in the hydrogen tank pressurization confirmed the leak.
Within 45 milliseconds of the breach of the external tank, a bright sustained glow developed on the black-tiled underside of the Challenger between it and the external tank. View of the Solid Rocket Booster problems with Challenger after launch Beginning at about 72 seconds, a series of events occurred extremely rapidly that terminated the flight.GATE Equity Webinar Series GATE Equity Webinar is Expanding.
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