1985-028A
After cancellation of 51-E and replanning, the mission was referred to in some internal documents as 51-DR or 51D(R).
After ET sep, a test to dump excess fuel was performed; the LOX vent torque was larger than expected and put Discovery into a 45 degree roll, which was quickly removed by RCS firings.
Deployment of the Anik satellite went smoothly, but Syncom failed to boot up after ejection. Discovery made a burn to reverse its separation maneuver as a plan was developed to fix the problem. A lever on the side of the satellite is normally knocked to the on position by the system that spins the Syncom out of the payload bay; triggering the lever is meant to active the electronics on the satellite. NASA's theory was that the lever had not been triggered. On April 15 the astronauts assembled two 'flyswatter' devices in the cabin, and the next day Hoffman and Griggs made a spacewalk to attach them to the RMS arm. On Apr 17 Discovery reapproached Syncom and used the robot arm to swat the Syncom's lever. The flyswatter made contact with the lever twice during the encounter but with no effect. Plans were drawn up to repair the satellite on a subsequent mission.
| STS 51-D mission events | |||
| Date | Time | Event | Orbit |
|---|---|---|---|
| 1985 Mar 23 | Roll to VAB | VAB | |
| 1985 Mar 28 | Rollout | LC39A | |
| 1985 Apr 12 | 1359:05 | Launch from LC39A | |
| 1401:12 | SRB sep at 46.7 km | ||
| 1407:57 | MECO at 109.9 km | ||
| 1408:16 | ET sep at 112.7 km | 89.75 64 x 459 x 28.5 (dV) | |
| 1442:20 | OMS-2 (2:23) 70m/s | ||
| 1444:43 | OMS-2 CO | 92.17 302 x 459 x 28.53 | |
| 1534 | PLBD open | ||
| 2012 | RMS tests | ||
| 2037 | RMS checkout complete | ||
| 2338:38 | Anik C1 deploy | ||
| 2354? | SEP-1 (OMS-3 RH 13s) 3m/s | 92.30 314 x 460 x 28.52 | |
| 1985 Apr 13 | 1458:22 | Leasat deploy | |
| 1510 | Stationkeep with Syncom IV-3 | ||
| 1514 | SEP-2 (OMS-4 8s) 4m/s | 92.30 314 x 460 x 28.52 | |
| 1543 | Planned Syncom PKM burn | ||
| 1636 | RETRO (OMS-5 8 s) 4m/s burn to stay 65 km from Syncom | ||
| 1985 Apr 14 | 1647 | 92.32 314 x 461 x 28.52 | |
| 1985 Apr 15 | 1045 | 92.31 314 x 460 x 28.52 | |
| 2000 | Two flyswatters assembled in cabin | ||
| 1985 Apr 16 | 1219 | Airlock at 3.1psi | |
| 1221 | Depressing to zero | ||
| 1225 | Vacuum reached | ||
| 1233 | HO | ||
| 1236 | Out in bay | ||
| 1240 | EVA (Hoffman;Griggs) (03:07, dp =03:10) | ||
| 1250 | EV2 biomed sensor failed | ||
| 1315? | Attach `flyswat' device to RMS | ||
| 1350 | Flyswat attach complete | ||
| 1420? | RMS cradled | ||
| 1507 | PSA stowed | ||
| 1519 | Ingress | ||
| 1530 | HC | ||
| 1535? | Repress | ||
| 1550? | EVA complete | ||
| 2054? | NSR (OMS-6 LH 12s) 3m/s | ||
| 1985 Apr 17 | 0700 | 92.31 315 x 459 x 28.52 | |
| 0929 | NCC mv | ||
| 1035 | NC3 (OMS-7 LH 13s) 3m/s | ||
| 1100 | TI (OMS-8 LH 9s) 3m/s | ||
| 1200 | MC3 burn RCS? | ||
| 1307 | At 15m from Syncom | ||
| 1400 | Rendezvous Syncom | ||
| 1405 | Arm in movement | ||
| 1414:56 | RMS contact with Leasat 3 | ||
| 1415:30 | Second RMS contact with Leasat 3 | ||
| 1418 | Contact time window closed | ||
| 1422? | RMS cradled | ||
| 1430? | Sep (OMS-9/LH 22s) 7m/s | 92.54 336 x 461 x 28.5 | |
| 1985 Apr 18 | 1610 | 92.55 337 x 461 x 28.52 | |
| 1985 Apr 19 | 0831 | PLBD closed | |
| 1244:25 | OMS DO (238s) 138m/s | ||
| 1248:23 | OMS DO CO | ||
| 1324 | Entry | ||
| 1354:28 | Landed RW33 KSC | ||
| 1354:36 | NGTD | ||
| 1355:31 | Wheels stop | ||
| 1820 | Tow to OPF | ||
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