Flown double-sided checklist page carried to the lunar surface on board the Lunar Module Challenger during the Apollo 17 mission, 5.5 x 8, marked as page numbers "2-19" and "2-20," signed and flight-certified on the front in black felt tip, "Flown to Taurus Littrow, Gene Cernan, Apollo XVII.” The front side is dated November 7, 1972, and features a list of five steps related to movement of the Lunar Module, with steps three and four referencing the TTCA (Thrust/Translation Controller Assembly), which provided the crewmen with the capability to issue discrete manual commands in each axis (X, Y, and Z), in addition to providing a throttle mode for varying the thrust of the descent engine. The reverse side, headed “DPS Pressurization and Checkout” and dated August 31, 1972, features a list of seven steps related to the Descent Propulsion System, a variable-throttle hypergolic rocket engine for use in the Apollo lunar module descent stage. In fine condition.
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