| Crew: 7 | CDR - Michael L. Coats |
| Plt - L. Blaine Hammond | |
| MS 1 - Gregory J. Harbaugh (EV 1) | |
| MS 2 - Donald R. McMonagle (EV 2) | |
| MS 3 - Guion S. Bluford (IV 1) | |
| MS 4 - Charles L. Veach | |
| MS 5 - Richard J. Heib | |
| Launch | 28 April 1991 @ 0733:14.07812 EDT |
| Orbital incl: | 57.00 |
| Max alt: | 270.4 km. |
| Orbits: | 132 |
| Dur: | 8:07:21:25 |
| Landing: | 6 May 1991 @ 1455:39 EDT |
| Launch Window: | 3 hours, 20 minutes (7:01 - 10:21 am EDT). Limited to 2 hours, 30 minutes due to "crew on back" constraint |
| TAL Sites: | Zaragoza (Alternates: Moron, Spain & Ben Guerir, Morocco) |
| ECAL (East Coast Abor Landing) site capability: | Cherry Point MAS, Oceana NAS, Dover AFB & Otis ANGB (2 engine out abort) |
| AOA site: | Northrup Strip, White Sands, NM |
| Primary landing site: | Edwards AFB (scheduled 11:48 am PDT, 6 May) |
| Landing Speed: | 210 knots (242 mph) |
| Landing rollout: | 9,152' from main gear touchdown |
| Vehicle weight @ liftoff: | 4,512,698 lbs |
| Orbiter weight @ liftoff: | 246,986 lbs |
| Orbiter weight @ landing: | 211,577 lbs |
| Cargo mass approx.: | 21,413 lbs |
| Landing Weight: | 20,586 lbs |
| Special mission kits: | Galley, TAGS, RMS-301, EMU's, EMU TV receiver (for IBSS), 4 filled cryo tanks, PSA, payload bay liner, 6 new GPC's (IBM AP-101S) includeing a spare |
| AFP-675 - Science Pallet, mass: 10,203 lbs | 1) CIRRIS-1A (see STS-4), AFGL-201 2) FAR-UV (Far Ultraviolet Camera), NRL-803, 3) URA (Uniformly Redundant Array), AFTAC-801, 4) HUP (Horizon Ultraviolet Program), AFGL-801A, 5) QINMS (Quadruple Ion-Neutral Mass Spectrometer), AFGL-304A |
| ISBB/SPAS-II - (Infared Background Signature Survey Payload) mass: 4,197 lbs | 1) IBSS/SPAS-II (Shuttle Pallet Satellite) - 1991-031B 2) CIV (Critical Ionization Velocity expirement) Four Canisters of compressed gas for release and observation by IBSS/SPAS-II and monitor subsystem (mass 1,215 lbs), 3) CRO (Chemical Release Observation experiment - mass 1,307 lbs) 3 sub-satellites, 180 lbs. each, deployed & observed by IBSS/SPAS-II (CRO-A with MMH (1991-031F), CRO-B with UDMH (1931-031E), CRO-C with N2O4 (1991-031D)) |
| STP-1 - mass, 4,288 lbs | 1) UVLIM (ultraviolet Limb Imaging experiment), 2) ALFE (Advanced Liquid Feed Experiment), 3) SKIRT (Spacecraft Kinetic Infrared Test), 4) DSE (Data System Experiment), 5) APM (see STS-31R) |
| MPEC - USA-70/1991-031C | Multipurpose Exp. Canister, carrying a classified deployable DOD sat. MPEC mass - 270 lbs. |
| Mid-deck | CLOUDS (see STS-14) and RME-III-03 (see STS-51A) |
| SSME's: | 2026 (1) - 1st use, 2030 (2) - 5th use, 2029 (3) - 4th use. At Tower Clear 104% |
| OMS Pods/Engines: | LP-04/109 - Pod 9th use, Motor 6th use & RP-03/114 - Pod 13th use, Motor 6th use |
| ET: | ET-46 (LWT-39) |
| SRB's: | BI-043 (RSRM-15) - Set successfully recovered |
| Left - ?A | Right - ?B | |||
| 30 | ? | Fwd | ? | TEM3 |
| 30 | ? | Cyl | ? | 31 |
| New | ? | Cyl | ? | 30 |
| 29 | ? | Cyl | ? | 28 |
| New | ? | Cyl | ? | New |
| 20 | ? | Cyl | ? | 31 |
| 31 | ? | Cyl | ? | 31 |
| 30 | ? | Att | ? | New |
| 31 | ? | Stf | ? | New |
| 31 | ? | Stf | ? | TEM4 |
| 30 | ? | Aft | ? | 31 |
| 26 September 1990 | ET-46 arrives on dock KSC |
| 18 October 1990 | OV-103 returns to the OPF-1 following Mission-36/STS-41 |
| 13 December 1990 | SRB stacking completed |
| 18 December 1990 | ET-46/SRB mate |
| 9 February 1991 | OV-103 rollover from OPF-1 to VAB High Bay 1 for stacking the next day |
| 15 February 1991 | Stack rollout to Pad 39A |
| 16 February 1991 | AFP-675 & IBSS/SPAS loaded into Discovery while on the pad |
| 20 February 1991 | TCDT countdown dress rehearsal conducted with crew aboard |
| 28 February 1991 | Stack ordered to roll back to VAB due to ET umbilical door hinge cracks on orbiter |
| 4 March 1991 | Payload transferred to PCR for storage |
| 7 March 1991 | Stack Rollback from Pad to VAB High Bay 1 |
| 12 March 1991 | Orbiter demate from stack for inspection/repairs in VAB High Bay 1 |
| 14 March 1991 | Rollover from VAB to OPF-2 |
| 25 March 1991 | Rollover from OPF-2 to VAB for restacking in High Bay 1 two days later |
| 1 April 1991 | Stack returned to Pad 39A |
| 5 April 1991 | Payload reloaded into Orbiter while on Pad 39A |
| 20 April 1991 | Original "Call to stations" 43 hr countdown started 8:45 am EDT & astronaut arrival KSC |
| 25 April 1991 | Second "Call to stations" 43 hr countdown started at 8:45 am EDT |
| 26 April 1991 | Astronauts arrive at KSC once again |
| 28 April 1991 | Launch |
| 6 May 1991 | Landing at KSC/SLF, OV-103 returned to OPF same day |