STS-6 was the sixth NASA Space Shuttle mission and the maiden flight of the .
Launched from Kennedy Space Center on 4 April 1983, the mission deployed the first Tracking and Data Relay Satellite, TDRS-1, into orbit, before landing at Edwards Air Force Base on 9 April.
STS-6 was the first Space Shuttle mission during which a spacewalk was conducted, and hence was the first in which the Extravehicular Mobility Unit (EMU) was used.
Crew
STS-6 was the last shuttle mission with a four-person crew until STS-135, the final shuttle mission, which launched on 8 July 2011.
Commander Paul Weitz had previously served as Pilot on the first Skylab mission, where he lived and worked in Skylab for nearly a month from May to June 1973.
After Skylab, Weitz became the Deputy Chief of the Astronaut Office under Chief Astronaut John Young.
Bobko originally became an astronaut for the Air Force's Manned Orbiting Laboratory program but later joined NASA in 1969 after the MOL program's cancellation.
Prior to STS-6 he participated in the Skylab Medical Experiment Altitude Test and worked as a member of the support crew for the Apollo-Soyuz Test Project.
Peterson was also a transfer from the MOL program, and was a member of the support crew for Apollo 16.
Musgrave joined NASA in 1967 as part of the second scientist-astronaut group, and was the backup Science Pilot for the first Skylab mission.
He also participated in the design of the equipment that he and Peterson used during their EVA on the STS-6 mission.
Support crew
Roy D. Bridges Jr. (entry CAPCOM)
Mary L. Cleave
Richard O. Covey (ascent CAPCOM)
Guy S. Gardner
Jon A. McBride
Bryan D. O'Connor
Spacewalks
Musgrave and Peterson
EVA Start: 7 April 1983
EVA End: 8 April 1983
Duration: 4 hours, 17 minutes
Crew seating arrangements
Mission background
The new orbiter was rolled out to LC-39A on a fog-shrouded morning in November 1982.
On 18 December, Challenger was given a PFRF (Pre Flight Readiness Firing) to verify the operation of the main engines.
The PFRF lasted for 16 seconds.
Although engine operation was generally satisfactory, telemetry data indicated significant leakage of liquid hydrogen in the thrust section.
However, it was not possible to determine the location of the leak with certainty, so program directors decided on a second PFRF with added telemetry probes.
It was known that during the test run on 18 December, that recirculated exhaust gases and vibration leaked into the thrust section and this was considered a potential cause of the leak.
Therefore, the original planned launch in late January 1983 had to be postponed.
On 25 January, a second PFRF was conducted which lasted 23 seconds and exhibited more hydrogen leaks.
Eventually, it was found that low pressure ducting in the No. 1 engine was cracked.
The engine was replaced by a spare, which was found to also have leaks.
A third engine had to be ordered from Rocketdyne, and after thorough testing, turned out to be in proper operating condition.
The No. 2 and No. 3 engines turned out to have leaks as well, and were taken out of the orbiter for repairs.
By mid-March, the engine problems had been completely resolved.
While the engine repairs were underway on 28 February, a severe storm caused contamination of the mission's primary cargo, the first Tracking and Data Relay Satellite, TDRS-1, while it was in the Payload Change-out Room on the Rotating Service Structure at the launch pad.
Consequently, the satellite had to be taken back to its checkout facility, where it was cleaned and rechecked.
The Payload Change-out Room and the payload bay also had to be cleaned.
All of these events pushed the launch back from 26 March to early April.
Mission summary
On 4 April 1983, STS-6, the first mission of the orbiter Challenger, lifted off at 13:30 EST.
It marked the first use of a new lightweight external tank and lightweight SRB casings, first use of the Heads Up Display, and first extravehicular activity in the Space Shuttle program.
STS-6 carried a crew of four – Paul J. Weitz, commander; Karol J. Bobko, pilot; Story Musgrave and Donald H. Peterson, both mission specialists.
Using new spacesuits designed specifically for the Space Shuttle program, Musgrave and Peterson successfully accomplished the program's first extravehicular activity (EVA) on 7–8 April 1983, performing various tests in the orbiter's payload bay.
Their spacewalk lasted 4 hours and 17 minutes and was the first American EVA since the last of Skylab 4's 4 EVAs nearly a decade prior.
Although the  TDRS satellite was successfully deployed from Challenger, its two-stage booster rocket, the Inertial Upper Stage (IUS), tumbled out of control, placing the satellite into a low elliptical orbit.
However, the satellite contained extra propellant beyond what was needed for its attitude control thrusters, and during the next several months, its thrusters were fired at carefully planned intervals, gradually moving TDRS-1 into its geosynchronous operating orbit, thus saving the $100-million satellite.
Other STS-6 payloads included three GAS canisters and the continuation of the Mono-disperse Latex Reactor and Continuous Flow Electrophoresis experiments.
Challenger returned to Earth on 9 April 1983 at 10:53 am PST, landing on Runway 22 at Edwards Air Force Base.
During the mission, it completed 80 orbits, traveling  in 5 days, 23 minutes and 42 seconds.
It was flown back to KSC on 16 April 1983.
Image:STS-6 TDRS-A deploy preparations.jpg|TDRS-A is deployed.
Image:STS-6 EVA.jpg|Musgrave during the EVA.
Image:STS-6 Musgrave & Peterson Challenger Cargo Bay.jpg|Musgrave, left, and Peterson float in Challenger's payload bay during the EVA.
Image:Space_Shuttle_Challenger_lands_for_the_first_time,_completing_STS-6.jpg|Challenger lands at Edwards AFB on 9 April 1983.
Mission insignia
The six white stars in the upper blue field of the mission patch indicate the flight's numerical designation in the Space Transportation System's mission sequence.
Wake-up calls
NASA began a tradition of playing music to astronauts during the Gemini program, and first used music to wake up a flight crew during Apollo 15.
Each track is specially chosen, often by the astronauts' families, and usually has a special meaning to an individual member of the crew, or is applicable to their daily activities.
See also
List of human spaceflights
List of Space Shuttle missions
Lists of spacewalks and moonwalks
References
"NASA to Market Spheres Made in Weightless Space" by Thomas O'Toole Washington Post Staff Writer The Washington Post; 2 May 1984; pg.
A4
Re: my earlier edit about the first thing manufactured and sold in space External links
STS-6 mission summary.
NASA.
STS-6 video highlights.
NSS.
