1985-063A
The first attempt to launch 51-F, at 2030 on 1985 Jul 12, ended in an RSLS abort at T-3s. The next attempt was on Jul 29; Challenger left the pad at 2100, but at 2105 the first SSME was automatically shut down - because of an incorrect sensor reading, it later transpired - and the CapCom could be heard calling to the Orbiter in a decisive tone "Abort! Abort ATO!". "Roger - Abort ATO", came the reply, and the first in-flight abort got underway. The ATO (Abort To Orbit) was the most benign type, and consisted of continuing to a lower than planned orbit on the two remaining engines. The OMS engines were ignited and used 1875 kg of OMS propellant to increase the final velocity.
The ET landed at 48.9S 159.1E instead of 33.6S 159.9W., in the same general area of the South Pacific but over 1500 km south of the target.
On Jul 30 at 2328 the RMS arm raised the PDP subsatellite above the payload bay, to make measurements of the plasma around the Shuttle. Inbetween active series of measurements, it was parked over the port wing from 0835 to 1840 on Jul 31, and again from 1928 to 2023. At 0010 on Aug 1, PDP was released into free flight as the Shuttle maneuvered around it in a test of the far field plasma properties of the Shuttle wake. The RMS arm recaptured the PDP at 0620 and observations with it attached to the arm continued until it was latched in the bay late on Aug 2. On Aug 5 the OMS 7 burn was used in a plasma depletion test to study the effects on the near-Shuttle plasma of a rocket burn. PDP was finally deactivated on Aug 6 at 0528, and Challenger landed without incident sixteen hours later.
| 51-F | |||
| Date | Time | Event | Orbit |
|---|---|---|---|
| 1985 Jun 24 | Rollover | VAB | |
| 1985 Jun 29 | Rollout | LC39A | |
| 1985 Jul 12 | 2030 | RSLS abort, T-3s | |
| 1985 Jul 29 | 2100:00 | Launch | LC39A |
| 2102:05 | SRB sep, 47.9 km | ||
| 2105:44 | ATO Abort, SSME 2023 cutoff | ||
| 2106:06 | OMS dump (1:46) | ||
| 2107:52 | OMS dump cutoff | ||
| 2109:42 | MECO, 113.4 km | 87.18 5 x 264 x 49.5 | |
| 2110:00 | ET sep, 116.4 km | ||
| 2133:00 | OMS 2 (2:02) 59.1?m/s | 89.15 198 x 266 x 49.5 | |
| 2135:02 | OMS 2 CO | ||
| 2234 | PLBD open | ||
| 1985 Jul 30 | 0039 | PDP activated in bay | |
| 1985 Jul 30 | 0230:27 | OMS 3 (35s) 17m/s | 89.76 206 x 317 x 49.5 |
| 0322:18 | OMS 4 (45s) 23m/s | 90.56 285 x 318 x 49.5 | |
| 0501:36 | OMS 5 (15s) 8m/s apogee | 90.83 311 x 319 x 49.5 | |
| 2326 | RMS grapple PDP | ||
| 2328 | RMS unberth PDP | ||
| 1985 Jul 31 | 0304 | 90.84 311 x 320 x 49.48 | |
| 0835 | PDP parked over port wing | ||
| 1840 | PDP observations resume | ||
| 1928 | PDP parked over port wing | ||
| 2023 | PDP observations resume | ||
| 2114 | PDP parked over port wing | ||
| 1985 Aug 1 | 0010 | RMS deploy PDP in free flight | |
| 0034 | Stationkeep at 91m | ||
| 0137 | Burn to out of plane point 1 | ||
| 0138 | Begin 'orbit' 1 | ||
| 0147 | OOP1 midcourse burn | ||
| 0157 | Burn to flux tube connection | ||
| 0202 | Flux tube connection | ||
| 0204 | Burn to phantom point 1 | ||
| 0216 | Burn to flux tube connection | ||
| 0235 | Burn, midcourse to lower flux tube 1 | ||
| 0240 | Flux tube connection | ||
| 0242 | Burn to wake transit 1 | ||
| 0249 | Midcourse to wake transit 1 | ||
| 0258 | Begin wake transit 1 | ||
| 0304 | Midpoint of wake transit 1 | ||
| 0305? | Begin second 'orbit' | ||
| 0345? | Midpoint of orbit | ||
| 0430 | Enter wake, begin in-plane wake studies | ||
| 0455 | Stationkeeping | ||
| 0530 | End stationkeeping, move in | ||
| 0620 | RMS grapple PDP | ||
| 0644 | PDP parked over port wing | ||
| 1653 | 90.83 310 x 320 x 49.49 | ||
| 1985 Aug 2 | 0714 | 90.83 308 x 321 x 49.48 | |
| 1824 | PDP target for IR glow observations | ||
| 1985 Aug 2 | 2241 | RMS berth PDP | |
| 2308 | RMS ungrapple PDP | ||
| 1985 Aug 3 | 1715 | 90.81 303 x 325 x 49.49 | |
| 1985 Aug 4 | 1745 | OMS 6 (16s) PD test, Hobart 8m/s | 90.81 301 x 326 x 49.5 |
| 1985 Aug 4 | 1914:44 | OMS 7 (3s) 2m/s | |
| 1985 Aug 6 | 0528 | PDP deactivated | |
| 1506 | PLBD close | 90.80 300 x 327 x 49.5 | |
| 1843:00 | OMS DO (171s) 92m/s | ||
| 1845:52 | OMS DO CO | 87.67 0 x 318 x 49.5 | |
| 1914:27 | Entry | ||
| 1945:26 | Landing | RW23 EAFB | |
| 1945:35 | NGTD | ||
| 1946:21 | Wheels stop | ||
| 1985 Aug 10 | 1350 | SCA 905 | EAFB |
| 1800 | SCA 905 | Davis-Monthan AFB TX | |
| 1985 Aug 11 | 1200 | SCA 905 | Eglin AFB, FL |
| 1985 Aug 11 | 1640 | SCA 905 | KSC SLF |
| 1985 Aug 11 | 2130 | OPF/1 | |
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