1. If the check seat was removed, install the new o-ring and lubricate with Apollo® lubricant, DOW® 111 or equal. Line up the seat with the bore and push it firmly into place. 2. Place and center the poppet assembly in the check seat. 3. Install the spring onto the poppet. 4. APOLLO (Apache Point Observatory Lunar Laser-ranging Operation) is a system for acquiring the range to the retroreflectors on the lunar surface. Lunar Laser Rang ing (LLR) involves launching a very brief laser pulse at one of several retroreflector arrays placed on the moon by the Apollo astronauts (or by an unmanned Soviet rover, in one case). Apollo X - Crew Training. Image Credit: NASA/JSC. Published: June 27, 2018. Historical Date: June 3, 1969. Astronaut Eugene A. Cernan (left), lunar module pilot of the Apollo 10 lunar orbit mission, confers with astronaut Edwin E. Aldrin Jr. during an Apollo 10 postflight de-briefing session. Aldrin is the lunar module pilot of the Apollo 11 @article{osti_5857536, title = {Apollo Multiplexer operations manual}, author = {Miller, M M}, abstractNote = {This report describes the operation of the the Apollo Multiplexer, a microprocessor based communications device designed to process data between an Apollo computer and up to four Gandalf PACXIV data switches. Details are given on overall operation, hardware, and troubleshooting. Apollo Operation & Installation Manual. Showing 1-9 of 21 results. Grid view List view. Apollo CNX80 Installation Manual 2003 $ 9.95. Apollo CNX80. Apollo II Morrow Model GX50,GX60,GX65 Installation Manual 560-0959-03 $ 9.95. Apollo II Morrow. Apollo Model GX50-GX60-GX65 GPS/COMM Installation Manual 560