1998-022A
STS-90 carried Neurolab, the final Spacelab mission. The first attempt to launch was scrubbed prior to tanking on Apr 16 when a network signal processor, used to relay data to TDRS or MILA, failed in tests. Launch the following day went without a hitch. STS-90 was the first test of the OMS Assist Maneuver, in which the OMS engines are fired shortly after SRB separation to provide extra payload capacity to orbit.
The Spacelab payload carried a variety of life sciences experiments. The BDS carried human renal cells and leukemia cells for study. On Apr 25 the CO2 system (RCDRS, Regenerative Carbon Dioxide Removal System) failed, threatening an early return. However, the system was soon fixed and the mission continued. An unexpectedly large number of the baby rats died during the mission, but otherwise the flight was completed smoothly.
| STS-90 | |||
| Date | Time | Event | Orbit |
|---|---|---|---|
| 1998 Mar 16 | 1550 | Roll to VAB | |
| 1998 Mar 23 | 1230 | Roll to LC39B | |
| 1998 Apr 16 | 1215 | Scrub with computer failure | |
| 1998 Apr 17 | 1819:00 | Launch by Shuttle from LC39B | |
| 1821:01 | SRB sep | ||
| 1821:15 | OMS assist burn, 1:42 | ||
| 1822:58 | OMS cutoff | ||
| 1827:28 | MECO | 78 x 280 x 39.0 | |
| 76 x 273 x 39.0 (STS-MR) | |||
| 1827:48 | ET sep | ||
| 1900:27 | OMS-2 1:50 52.1m/s | ||
| 1902:18 | OMS-2 CO | 257 x 286 x 39.0 | |
| 1956 | PLBD open | ||
| 1998 Apr 21 | 89.90 256 x 282 x 39.0 | ||
| 1998 Apr 22 | 2014:00 | RCS orbit adjust 1 15s 1m/s | 89.86 253 x 282 x 39.0 |
| 1998 Apr 25 | 0345 | CO2 scrub system failed | |
| 1998 Apr 26 | System repaired | ||
| 1998 Apr 27 | 1828:59 | RCS orb adj 2 7s 0.5m/s | 89.80 249 x 278 x 39.0 |
| 1998 May 3 | 1235 | PLBD closed | 89.72 247 x 274 x 39.0 |
| 1510:10 | OMS DO 2:19 64.9m/s | ||
| 1512:30 | OMS DO CO | 87.53 31 x 272 x 39.0 | |
| 1537:14 | Entry interface | ||
| 1608:59 | MGTD KSC RW33, 15:21:49:59 | ||
| 1609:13 | NGTD | ||
| 1609:58 | Wheels stop | ||
| 2230 | Tow to OPF/3 | ||
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