Editing Apollo 6 (section)

== Equipment ==
[[Image:67-H-1230 Lunar module LTA-2 R.jpg|thumb|The Lunar Module Test Article (LTA-2R) being moved for mating with the spacecraft–LM adapter.]]
Apollo 6's launch vehicle was designated AS-502, the second flight-capable Saturn V. Its payload included CSM-020, a Block I CSM that had some Block II modifications. The Block I CSM did not have the capability of docking with a Lunar Module, as the Block II did.{{sfn|Orloff & Harland 2006|p=172}} Among the modifications to CSM-020 was a new crew hatch, intended to be tested under lunar return conditions.{{sfn|Orloff & Harland 2006|p=151}} This new hatch replaced the one which was condemned by the [[Apollo 1]] investigation board as too difficult to open in case of emergency, circumstances that had contributed to the deaths of three astronauts in the Apollo 1 fire of January 27, 1967.{{sfn|Orloff & Harland 2006|pp=112–115}} The command module used was CM-020; it carried a mission programmer and other equipment to allow it to be operated remotely.{{sfn|Press Kit|p=15}}<ref name = "end" />

The service module used was SM-014—the originally-planned SM for Apollo 6, SM-020, was used for Apollo 4 after its SM, SM-017, was damaged in an explosion and had to be scrapped.<ref name = "end" /> CM-014 was unavailable for flight as it was being used to aid the Apollo 1 investigation.<ref name="MarAprChron">{{Cite book |last=Ertel |first=Ivan D. |url=http://www.hq.nasa.gov/office/pao/History/SP-4009/contents.htm#Volume%20IV |title=The Apollo Spacecraft: A Chronology |last2=Newkirk |first2=Roland W. |last3=Brooks |first3=Courtney G. |publisher=[[NASA]] |year=1969–1978 |volume=IV |location=Washington, D.C. |chapter=Part 1 (H): Preparation for Flight, the Accident, and Investigation: March 25 – April 24, 1967 |lccn=69060008 |oclc=23818 |id=NASA SP-4009 |display-authors=2 |access-date=September 25, 2021 |chapter-url=http://www.hq.nasa.gov/office/pao/History/SP-4009/v4p1h.htm |archive-date=February 5, 2008 |archive-url=https://web.archive.org/web/20080205020128/http://www.hq.nasa.gov/office/pao/History/SP-4009/contents.htm#Volume%20IV |url-status=dead }}</ref> Not all SM systems were activated for the short Apollo 6 mission: the radiators to remove excess heat from the electrical power system and the environmental control system were not connected.{{sfn|Press Kit|p=16}}

[[Kenneth S. Kleinknecht]], Command and Service Module manager at the [[Johnson Space Center|Manned Spaceflight Center]] in Houston, was pleased with CSM-020 when it arrived at [[Kennedy Space Center]] from [[North American Aviation]], the manufacturer, though he was upset it arrived wrapped in flammable [[mylar]]. In contrast with Apollo 1's ill-fated CSM, which arrived with hundreds of unresolved issues, CSM-020 had only 23, mostly routine problems.{{sfn|Brooks 1979|pp=247–248}}

Also flown on Apollo 6 was a lunar test article: a simulated lunar module, designated as LTA-2R. It included a flight-type descent stage without landing gear, its fuel tanks filled with a water–[[glycol]] mixture and [[freon]] in its oxidizer tanks. Containing no flight systems, its ascent stage was made of ballasted aluminum and instrumented to show vibration, acoustics and structural integrity. LTA-2R remained inside the Spacecraft-Lunar Module Adapter, numbered SLA-9, throughout the flight.{{sfn|Press Kit|p=19}}<ref name = "hardware">{{cite web|title=Apollo/Skylab ASTP and Shuttle Orbiter Major End Items|date=March 1978|url=https://s3.documentcloud.org/documents/6473665/Apollo-Skylab-ASTP-and-Shuttle-Orbiter-Major-End.pdf|publisher=[[NASA]]|page=10}}</ref>