Flown double-sided Lunar Module Reaction Control System cue card carried on the Apollo 17 mission, 10.5 x 8, signed and flight-certified along the bottom edge in black ink, "Flown to the Lunar Surface Aboard Apollo XVII, Gene Cernan." Headed "RCS/Common," the cue card lists troubleshooting steps for the Reaction Control System, which used thrusters to provide translation and attitude control. In fine condition. Accompanied by a signed letter of provenance from Cernan, in part: "This cue card was carried to the lunar surface aboard the spacecraft Challenger and spent time on the moon in the Taurus-Littrow valley during the last Apollo lunar landing mission in December 1972. The RCS/Common cue card would have been used if we had experienced a Reaction Control System failure in the Lunar Module during the mission. It contains failure indications, workarounds to solve for failures, and other operating information about the RCS system onboard the Lunar Module. Cue cards like this one are critical to allowing the crew to react quickly and accurately to contingencies that arise during the mission." Also accompanied by an image of Cernan with the cue card and letter. A fantastic astronaut-certified flown piece that, thankfully, proved unneeded in executing man's last lunar landing.
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