Editing Apollo Lunar Module (section)

===Contract letting and construction location===
In July 1962, eleven firms were invited to submit proposals for the LEM. Nine companies responded in September, answering 20 questions posed by the NASA RFP in a 60-page limited technical proposal. [[Grumman]] was awarded the contract officially on November 7, 1962.<ref>{{Cite web|first=Amy Shira|last=Teitel|date=May 31, 2019|title=Lunar Module: How do you land on the Moon?|url=https://astronomy.com/news/2019/05/lunar-module-how-do-you-land-on-the-moon|access-date=September 29, 2021|website=Astronomy.com|language=en}}</ref> Grumman had begun lunar orbit rendezvous studies in the late 1950s and again in 1961. The contract cost was expected to be around $350&nbsp;million.<ref>{{Cite news|date=November 16, 1962|title=Aerospace: Grumman in Orbit|language=en-US|magazine=Time|url=https://content.time.com/time/subscriber/article/0,33009,829433,00.html|access-date=September 29, 2021|issn=0040-781X}}</ref> There were initially four major subcontractors: [[Bell Aerosystems]] ([[Ascent Propulsion System|ascent engine]]), [[Hamilton Standard]] ([[Environmental control system|environmental control systems]]), [[Marquardt Corporation|Marquardt]] ([[reaction control system]]) and [[Rocketdyne]] ([[Descent Propulsion System|descent engine]]).<ref>{{cite web |url=http://www.hq.nasa.gov/office/pao/History/SP-4205/ch6-5.html |title=Chariots for Apollo: A History of Manned Lunar Spacecraft; Engines, Large and Small |author1=Courtney G. Brooks |author2=James M. Grimwood |author3=Loyd S. Swenson |date=September 20, 2007 |access-date=June 7, 2012 |archive-date=March 1, 2012 |archive-url=https://web.archive.org/web/20120301152142/http://www.hq.nasa.gov/office/pao/History/SP-4205/ch6-5.html |url-status=live }}</ref>

The [[Apollo PGNCS|Primary Guidance, Navigation and Control System]] (PGNCS) was developed by the [[Charles Stark Draper Laboratory|MIT Instrumentation Laboratory]]; the [[Apollo Guidance Computer]] was manufactured by [[Raytheon]] (a similar guidance system was used in the [[Apollo command and service module|command module]]). A backup navigation tool, the [[Apollo Abort Guidance System|Abort Guidance System]] (AGS), was developed by [[TRW Inc.|TRW]]. The landing gear was manufactured by [[Héroux-Devtek|Héroux]].<ref>{{cite web | url=https://spaceq.ca/the-canadian-story-of-the-apollo-lunar-module-landing-legs/ | title=The Canadian Story of the Apollo Lunar Module Landing Legs | date=July 15, 2019 }}</Ref> 

The Apollo Lunar Module was assembled in a Grumman factory in [[Bethpage, New York]].<ref name="NASA Jan182018">{{cite web |last=Garcia|first=Mark|title=50 Years Ago: The Apollo Lunar Module | website=NASA | date=18 January 2018 | url=http://www.nasa.gov/feature/50-years-ago-the-apollo-lunar-module | access-date=26 December 2022}}</ref><ref name="Newsday Jul192019">{{cite web | last=Jones | first=Bart | title=Bethpage park honors workers who built Apollo 11 lunar module | website=Newsday | date=19 July 2019 | url=https://www.newsday.com/long-island/nassau/apollo-grumman-bethpage-park-dedication-a09303 | access-date=26 December 2022}}</ref>