The time and altitude of SRB jettison can be verified by reviewing the following NASA sites:
The timeline used to create the launch profile we've discussed on our site was obtained from a NASA press kit for STS-30. The key points of that trajectory are summarized below.
|STS-30 Trajectory Sequence of Events|
Mission Elapsed Time
|Begin Roll Maneuver||0/00:00:09||183||0.16||774|
|End Roll Maneuver||0/00:00:17||365||0.32||2,825|
|SSME Throttle Down to 65%||0/00:00:30||711||0.64||9,043|
|Maximum Dynamic Pressure (Max Q)||0/00:00:59||1,368||1.35||35,133|
|SSME Throttle Up to 104%||0/00:01:02||1,428||1.43||37,284|
|Main Engine Cutoff (MECO)||0/00:08:31||24,286||22.70||362,243|
Note that the solid rocket boosters are jettisoned at two minutes and five seconds after launch at the point called "SRB Staging." At that time, the vehicle is traveling nearly 3,000 mph (4,600 km/h) at an altitude of 29 miles (47 km).
After recovery, the SRBs are towed back to shore where they are refurbished for use on a future flight. Each
booster is designed to complete about 25 flights before it is no longer usable.
- answer by Doug Jackson, 4 July 2004
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