Cancelled Missions: Apollo AS-278
Planned launch: August 1967
Launch Vehicle: Saturn IB SA-207 and SA-208
Spacecraft: CSM-101 and LM-2
Prime crew:
-Commander: James Alton McDivitt
-Command Module Pilot: David Randolph Scott
-Lunar Module Pilot: Russell Louis "Rusty" Schweickart
Backup crew:
-Commander: Patten "Tom" Stafford CDR
-Command Module Pilot: John Watts Young
-Lunar Module Pilot: Eugene Andrew "Gene" Cernan
The mission number of AS-278, came from Saturn IB AS-207 and AS-208. It was also known as Apollo 3 and was planned as an D-type mission.
"It was planned that McDivitt's crew would conduct the Apollo D mission - a first manned test in earth orbit of the Lunar Module. Separate Saturn IB launches would put Apollo Block II CSM 101 / AS-207 and Lunar Module LM-2 / AS-208 into earth orbit a day later. The crew would then rendezvous and dock with the lunar module and put it through its paces.
When Schirra's Apollo 2 / AS-205 mission was cancelled in November 1966, the booster went to McDivitt's mission, and it was called AS-205/208, or AS-258."
-information from Astrnautix.com: link
Command Module 101 for Apollo-Saturn 205 mission on the workstand.
NASA ID: S68-42486
LM-2 under construction in Bethpage, Long Island, New York.
NASA ID: S68-36263
This flight was cancelled due of the Apollo 1 launch pad fire on January 27, 1967. After the fire, it was decided to launch the mission on a single Saturn V as Apollo 9. The prime crew remained the same for Apollo 9 but the backup crew flew as Apollo 10.
Information from spacefacts.de: link
Launch of AS-205 (CSM-101/SA-205) from LC-34 while AS-208 (LM-2/SA-208) waiting on LC-37B to launch the next day
Screenshot from orbit-forum.com: link
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