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The Skylab Rescue Mission (also SL-R)[1]:iii was a backup rescue flight as part of a contingency plan for the Skylab space station.[2][3] It used a modified Apollo Command Module that could be launched with a crew of two and return a crew of five.[1]:1-1[4]

Skylab Rescue
Drawing of a space capsule with astronauts sitting with their backs to the floor on two layers, three on the top and two beneath
Skylab Rescue Command Module Diagram
Mission typeCrew rescue
OperatorNASA
Spacecraft properties
SpacecraftApollo CSM-119
ManufacturerNorth American Aviation
Crew
Crew size2 at launch
5 at landing
MembersVance D. Brand
Don L. Lind
Start of mission
Launch dateOn standby
August 1973 - February 1974
(Unlaunched)
RocketSaturn IB AS-208/209
Launch siteKennedy LC-39B
Docking with Skylab
Docking portForward
Skylab rescue crew.jpg
Skylab rescue crew portrait (Left to right; Vance Brand and Don Lind

HistoryEdit

Plans for outfitting an Apollo Command/Service Module (CSM) as a space rescue vehicle date back to November 1965 when North American Rockwell technicians conceived the possibility of a rescue mission for astronauts trapped in lunar orbit.[5][6] After a rescue mission in Earth orbit was depicted in the 1969 film Marooned, the company revived the concept in November 1970.[2] Marshall Space Flight Center issued a formal Mission Requirements document on 17 May 1972, with subsequent revisions.[1]:iii The standard Skylab Command Module accommodated a crew of three with storage lockers on the aft bulkhead for resupply of experiment film and other equipment, as well as the return of exposed film, data tapes and experiment samples. To convert the standard CSM to a rescue vehicle, the storage lockers were removed and replaced with two crew couches to seat a total of five crewmen.[4]

AS 208Edit

After Skylab 3 was launched, the crew's CSM developed a problem with two of its reaction control system thruster quads. They were leaking fuel, one failing before the CSM docked with the station and another on August 2, six days later. The malfunctions only left two available quads, and while the spacecraft could operate with just one, the leaks posed a possible risk to other systems.[7]:208

NASA first considered bringing the crew home immediately.[3] However, because the astronauts were safe on the station with ample supplies and because plans for a rescue flight existed,[7]:209 the mission continued while the Saturn IB rocket AS 208 with CSM 119[4] was assembled in the Vehicle Assembly Building at Launch Complex 39 for possible use. It was at one point rolled out to LC-39B.

NASA announced on August 4, 1973 that Skylab 3 and Skylab 4 backup crewmen Vance Brand and Don Lind would fly any rescue mission; they had immediately begun training for the flight once the second quad had failed on August 2. After engineers found that the leaks would not disable the spacecraft, the two men used simulators to test reentry using two quads. If ground personnel worked 24 hours a day and skipped some tests, the mission could launch on September 10,[3][8]:299 and would last no more than five days.[1]:2–6[7]:208–209 The astronauts would attempt to prepare Skylab for further use but returning experimental data and diagnosing the cause of the problem were more important,[1]:2-1 with Lind choosing what would be brought back.[7]:211[9] Although Skylab had two docking ports the primary one would be used if possible, jettisoning the Skylab crew's CSM if necessary.[1]:2-2,3,8

Within hours of the failure of the second quad, however, NASA had decided to cancel the rescue mission. Beyond the space agency's conclusion that the failed quads would not disable the Skylab 3 CSM, Brand and Lind had already shown during their training as backup Skylab crewmen that a reentry with failed quads was safe. They continued to train for a rescue mission, as well as for their backup roles,[7]:210–211[9] but the Skylab 3 crew was able to complete its full 59-day mission on the station and safely return to Earth using the two functional RCS thruster quads.[10]:103–4

AS 209Edit

 
The Skylab Rescue CSM is removed from its Saturn IB Launch vehicle in the Vehicle Assembly Building, following the successful recovery of Skylab 4.

After the Skylab 4 launch, another rescue flight was assembled as a backup contingency. The Saturn IB rocket AS 209 was assembled in the Vehicle Assembly Building at Launch Complex 39 for possible use. It also used the CSM 119 Command Module that was to be launched with Brand and Lind.

There were also plans for a short 20-day Skylab 5 flight that would use this backup CSM. The crew, likely consisting of Brand, Lind, and Skylab backup Science Pilot William B. Lenoir, would have performed some scientific research and closed out the station until the Space Shuttle was operational. However, the extension of Skylab 4 from fifty-six to eighty-four days obviated the need for the additional mission.

AS 209 and CSM 119 were later used as a backup to the ASTP mission. Both are now on display at the Kennedy Space Center Visitor Complex. CSM 119 is located in the Apollo/Saturn V Center. The Saturn IB booster for AS 209 is currently located in the Visitor Complex's Rocket Garden. It is displayed horizontally, mated to an Apollo FVV (Facilities Verification Vehicle) which was formerly displayed at the VAB's Visitor Complex c. October 1968.

In 2007, after sitting untouched for over 30 years, NASA engineers used the command module for studies on the spacecraft's life support adapter assembly[11] – the projecting aerodynamic fairing that allows oxygen, water, and electricity to flow from the Service Module to the Command Module. This was in support of the design and construction of a similar system on the new Orion spacecraft, which resembles the Skylab Rescue configuration.

CrewEdit

Position Astronaut
Commander Vance D. Brand
First spaceflight
Command Module Pilot Don L. Lind
First spaceflight

Brand flew in 1975 as the Command Module Pilot of the Apollo-Soyuz Test Project before commanding three Space Shuttle missions (STS-5 in 1982, STS-41-B in 1984 and STS-35 in 1990). Lind would wait another decade before he flew as a Mission Specialist on STS-51-B in 1985.

See alsoEdit

ReferencesEdit

  1. ^ a b c d e f " Mission Requirements, Skylab Rescue Mission, SL-R" NASA, 24 August 1973.
  2. ^ a b Wade, Mark. "Skylab Rescue Archived 2005-09-06 at the Wayback Machine". Encyclopedia Astronautica. Retrieved 2009-04-10.
  3. ^ a b c "Skylab's New Crisis: A Rescue Mission?" TIME, August 13, 1973. Retrieved April 10, 2009.
  4. ^ a b c Wade, Mark. "Apollo Rescue CSM Archived 2009-03-17 at the Wayback Machine". Encyclopedia Astronautica. Retrieved April 10, 2009.
  5. ^ "4-Man Apollo Rescue Mission" Nasa Technical Reports Server. Retrieved April 18, 2011
  6. ^ Portree, David S.F. (October 6, 2012). "Beyond Apollo: Apollo Lunar Orbit Rescue (1965)". Retrieved January 12, 2013.
  7. ^ a b c d e Shayler, David J. (2001). Skylab: America's Space Station. Berlin: Springer. ISBN 1-85233-407-X.
  8. ^ Benson, Charles Dunlap and William David Compton. Living and Working in Space: A History of Skylab. NASA publication SP-4208.
  9. ^ a b Don L. Lind oral history transcript, NASA Johnson Space Center Oral History Project, May 27, 2005.
  10. ^ Belew, Leland. F. (editor) Skylab, Our First Space Station NASA publication SP-400.
  11. ^ " Using History to Design the Future" NASA, retrieved March 9, 2011

External linksEdit