STS-39

USA


Manned Flight n: 140

Earth orbit Flight n: 137

USA manned Flight n: 71


Launch, orbit & landing data:

Designation 21242 / 91031A
Launch date - time 28 Apr 1991 - 11:33:14 UT
Launch site KSC, LC39A
Launch vehicle  Space Shuttle
Orbiter Discovery OV-103 (#12)
Primary payload CRO-A, B & C; SPAS-2, USA-70
(AFP-675 and IBSS)
Mass (kg) 
Flight Crew Coats, Hammond, Harbaugh, McMonagle
Bluford, Veach, Hieb
Call Sign 
Earth orbit on :
   - Perigee / Apogee  km
   - Inclination 57.0°
   - Period  min
Landing date - time 06 May 1991 - 18:55:35 UT
Landing location KSC, Runway 15
Flight Duration (d:hr:min) 8d 07h 22m
Nbr orbits 134

Manned seven crew. Deployed USA 70, CRO A, CRO B, CRO C; deployed and retrieved IBSS.

Crew

Nr. Surname Given name Job Duration
1  Coats  Michael Lloyd  CDR 8d 07h 22m 
2  Hammond  Lloyd Blaine, Jr.  PLT 8d 07h 22m 
3  Bluford  Guion Stewart, Jr.  MSP 8d 07h 22m 
4  Harbaugh  Gregory Jordan  MSP 8d 07h 22m 
5  Hieb  Richard James  MSP 8d 07h 22m 
6  McMonagle  Donald Ray  MSP 8d 07h 22m 
7  Veach  Charles Lacy  MSP 8d 07h 22m 

Mission details:



Payload: Discovery F12. Mass: 9,712 kg. Perigee: 248 km. Apogee: 263 km. Inclination: 57.0 deg. Period: 89.6 min.

Payloads: Infrared Background Signature Survey (lBSS), Air Force Program (AFP)-675, Space Test Payload (STP)-I, Multi-Purpose Experiment Canister (MPEC), Cloud Logic to Optimize Use of Defense Systems (CLOUDS)-1A, Radiation Monitoring Equipment (RME)-lll.

Orbits of Earth: 134. Distance traveled: 5,584,423 km. Orbiter Liftoff Mass: 112,030 kg. Orbiter Mass at Landing: 95,620 kg. Payload to Orbit: 9,712 kg. Payload Returned: 9,337 kg. Landed at: Runway 15 at Kennedy Space Center, Florida. Landing Speed: 389 kph. Touchdown miss distance: 51 m. Landing Rollout: 2,789 m.



NASA Official Mission Narrative

Mission Name: STS-39 (40)
DISCOVERY (12)
Pad 39-A (40)
40th Shuttle mission
12th Flight OV-103
7th Rollback
Diverted landing
7th KSC landing

Crew:
Michael L. Coats (3), Commander
L. Blaine Hammond, Jr.(1), Pilot
Guion S. Bluford Jr.(3), Mission Specialist 1
Gregory J. Harbaugh (1), Mission Specialist 2
Richard J. Hieb (1), Mission Specialist 3
Donald R. McMonagle (1), Mission Specialist 4
Charles L. Veach (1), Mission Specialist 5

Milestones:
Flow A:
OPF - Oct. 17,1990
VAB - Feb. 9,1991
PAD - Feb. 15, 1991
Flow B (rollback):
VAB - March 7,1991
OPF - March 15, 1991
VAB - March 25,1991
PAD - April 1, 1991

Payload:
DoD(8),AFP-675,IBSS,STP-01,MPEC
Mission Objectives:

Launch:
April 28, 1991,7:33:14 a.m. EDT. Launch originally scheduled for March 9, but during processing work at Pad A, significant cracks found on all four lug hinges on the two external tank umbilical door drive mechanisms. NASA managers opted to roll back the vehicle to the VAB on March 7, and then to OPF for repair. Hinges replaced with units taken from orbiter COLUMBIA, and reinforced. Discovery returned to pad on April 1, and launch re-set for April 23. Mission again postponed when, during prelaunch external tank loading, a transducer on high-pressure oxidizer turbopump for main engine number three showed readings out of specification. Transducer and its cable harness were replaced and tested. Launch was rescheduled for April 28. Launch Weight: 247,373 lbs
Orbit:
Altitude: 140nm
Inclination: 57.0 degrees
Orbits: 134
Duration: 8 days, 7 hours, 22 minutes, 23 seconds.
Distance: 3,470,000 miles

Hardware:
SRB: BI-043
SRM: 360L015
ET : 46/LWT-39
MLP : 2
SSME-1: SN-2026
SSME-2: SN-2030
SSME-3: SN-2029

Landing:
May 6, 1991, 2:55:35 p.m. EDT, Runway 15, Kennedy Space Center, Fla. Rollout distance: 9,235 feet. Rollout time: 56 secs. Landing diverted to KSC because of unacceptably high winds at planned landing site, Edwards. Landing Weight: 211,512 lbs.

Mission Highlights:
Dedicated Department of Defense mission. Unclassified payload included Air Force Program-675 (AFP675); Infrared Background Signature Survey (IBSS) with Critical Ionization Velocity (CIV), Chemical Release Observation (CRO) and Shuttle Pallet Satellite-II (SPAS-II) experiments; and Space Test Payload-1 (STP-1). Classified payload consisted of Multi-Purpose Release Canister (MPEC). Also on board was Radiation Monitoring Equip- ment III (RME III) and Cloud Logic to Optimize Use of Defense Systems-IA (CLOUDS-I).


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