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Despite this, the LM eventually became the most reliable component of the Apollo/Saturn The total cost of the LM for development and the units produced was $21.3B in 2016 dollars, adjusting from a nominal total of $2.2BAt launch, the Lunar Module sat directly beneath the Soon after TLI, the SLA opened and the CSM separated, turned around, came back to dock with the Lunar Module, and extracted it from the S-IVB. A 1962 model of the first LEM design, docked to the Command / Service Module, is held by The Lunar Module (originally designated the Lunar Excursion Module, known by the In July 1962, eleven firms were invited to submit proposals for the LEM. A ball joint at the lower end of each strut attached to a circular footpad.Other components of each landing gear assembly included secondary struts, a cross member assembly, side frames, and a deployment and down-lock mechanism.A ladder and porch, mounted on the front leg, allowed astronauts access to and from the lunar surface. The lunar module (originally designated the lunar excursion module, known by the acronym LEM) was designed after NASA chose to reach the Moon via Lunar Orbit Rendezvous (LOR) instead of the direct ascent or Earth Orbit Rendezvous(EOR) methods. Apollo 9 was the first mission to test the LM in Earth orbit with a crew onboard. Octagon-shaped, it was supported by four folding landing gear legs, and contained a Equipment for the lunar exploration was carried in the Modular Equipment Stowage Assembly (MESA), a drawer mounted on a hinged panel dropping out of the lefthand forward compartment.

There it remained through earth parking orbit and the Trans Lunar Injection (TLI) rocket burn to send the craft toward the Moon.Soon after TLI, the SLA opened and the CSM separated, turned around, came back to dock with the Lunar Module, and extracted it from the S-IVB. After a few course correction burns, the LM would rendezvous with the CSM and dock for transfer of the crew and rock samples. When the excursion was over, it served as the launch pad for the ascent stage. See the individual mission articles for each LM's weight. After a few course correction burns, the LM would rendezvous with the CSM and dock for transfer of the crew and rock samples. The return payload included the lunar rock and soil samples collected by the crew (as much as 238 pounds (The Descent stage's primary job was to support a powered landing and surface extravehicular activity. Control was exercised with a combination of engine throttling and attitude thrusters, guided by the computer with the aid of landing radar. The CSM would then raise its perilune back to the normal 60 nautical miles (110 km).The extended lunar module (ELM) used on the final three Weights given here are an average for the original pre-ELM spec vehicles. This lunar module represents one of humanity’s greatest achievements: landing people on another heavenly body. A square hatch, located on the front of the pressurized compartment, allowed space suited astronauts to exit the spacecraft.

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