If the Saturn launch vehicle and the Apollo spacecraft were difficult technological challenges, the third part of the hardware for the Moon landing, the Lunar Module (LM), represented the most serious problem. Begun a year later than it should have been, the LM was consistently behind schedule and over budget. Much of the problem turned on the demands of devising two separate spacecraft components--one for descent to the Moon and one for ascent back to the command module--that only maneuvered outside an atmosphere. Both engines had to work perfectly or the very real possibility existed that the astronauts would not return home. Guidance, maneuverability, and spacecraft control also caused no end of headaches. The landing structure likewise presented problems; it had to be light and sturdy and shock resistent. An ungainly vehicle emerged which two astronauts could fly while standing. In November 1962 Grumman Aerospace Corp. signed a contract with NASA to produce the LM, and work on it began in earnest. With difficulty the LM was orbited on a Saturn V test launch in January 1968 and judged ready for operation.82
