Editing Lockheed C-5 Galaxy (section)

==Variants==
===C-5A===
[[File:C-5A Cockpit.jpg|thumb|Instrument panel of a C-5A]]

The C-5A is the original version of the C-5. From 1969 to 1973, 81 C-5As were delivered to the Military Airlift Command of the U.S. Air Force. Due to cracks found in the wings in the mid-1970s, the cargo weight was restricted. To restore the C-5's full capability, the wing structure was redesigned. A program to install new strengthened wings on 77 C-5As was conducted from 1981 to 1987. The redesigned wing made use of a new [[aluminum alloy]] that did not exist during the original production.{{cn|date=February 2023}} As of August 2016, there were ten A-models in service flown by the Air Force Reserve Command's 433d Airlift Wing at Lackland AFB / Kelly Field, Texas, and 439th Airlift Wing at Westover ARB, Massachusetts.<ref>{{cite web|url=http://www.amarcexperience.com/ui/index.php?option=com_content&view=article&id=5&catid=16&dbsource=typelist&dbtype=C005A&dbpage=1&dbletter=L|title=AMARC Experience – Search the Database|website=amarcexperience.com}}</ref> The last operational C-5A was retired on 7 September 2017.<ref>{{cite web|url=https://www.dvidshub.net/video/549245/last-c-5a-galaxy-arrives-amarg|title=Last C-5A Galaxy Arrives at AMARG|website=dvidshub.net}}</ref>

===C-5B===
The C-5B is an improved version of the C-5A. It incorporated all modifications and improvements made to the C-5A with improved wings, simplified landing gear, upgraded TF-39-GE-1C turbofan engines and updated avionics. Fifty examples of the new variant were delivered to the U.S. Air Force from 1986 to 1989.<ref>Miller 2003, p. 53.</ref>

===C-5C===
The C-5C is a specially modified variant for transporting large cargo. Two C-5As (68-0213 and 68-0216) were modified following major accidents to have a larger internal cargo capacity to accommodate large payloads, such as satellites. The major modifications were the removal of the rear passenger compartment floor, splitting the rear cargo door in the middle, and installing a new movable aft bulkhead further to the rear.<ref name="Norton_p62">Norton 2003, pp. 62, 78.</ref> The official C-5 technical manual refers to the version as C-5A(SCM) ''Space Cargo Modified''. Modifications also included adding a second inlet for ground power, which can feed any power-dependent equipment that may form part of the cargo. The two C-5Cs are operated by U.S. Air Force crews for DOD spacecraft programs and [[NASA]], and are stationed at Travis AFB, California.

===C-5D===
Proposed during the 1990s Non-Developmental Airlift Aircraft (NDAA) program as an alternative to further purchases of the [[McDonnell Douglas C-17 Globemaster III]] as well as a replacement for older C-5As. The C-5D was to have [[GE-Aviation|General Electric]] [[General Electric CF6|F138-GE-100]] (CF6-80C2) engines, improved avionics and significantly improved reliability and maintainability, although it could not use austere runways or conduct [[airdrop]] operations and had a higher expected operating cost. The plan was canceled in favor of the purchase of more C-17s. The specifications of the C-5D were later used in the C-5M upgrade program.<ref>FlightGlobal.[https://www.flightglobal.com/lockheed-chooses-cf6-80c2-for-c-5d/17021.article "Lockheed chooses CF6-80C2 for C-5D"]. Flightglobal.com </ref>

===L-500===
Lockheed also planned a civilian version of the C-5 Galaxy, the ''L-500'', the company designation also used for the C-5 itself. Both passenger and cargo versions of the L-500 were designed. The all-passenger version would have been able to carry up to 1,000 travelers, while the all-cargo version was predicted to be able to carry typical C-5 volume for as little as 2 cents per [[ton-mile]] (in 1967 dollars).<ref>[https://web.archive.org/web/20070603201214/http://www.time.com/time/magazine/article/0,9171,712157,00.html "Aircraft: The Biggest Bird"]. ''[[Time (magazine)|Time]]'', 12 July 1968.</ref> Although some interest was expressed by carriers, no orders were placed for either L-500 version, due to operational costs caused by low fuel efficiency, a significant concern for a profit-making carrier, even before the oil crisis of the 1970s, keen competition from Boeing's 747, and high costs incurred by Lockheed in developing the C-5, and later the [[Lockheed L-1011 TriStar|L-1011]], which led to the governmental rescue of the company.<ref>{{usurped|1=[https://web.archive.org/web/20110402070028/http://www.doraplane.com/index_files/Page585.htm "Lockheed L-500 Galaxy proposed UAL colors, c. 1968"]}}.  doraplane.com. Retrieved 3 January 2011.{{rs|date=July 2022}}</ref>

===C-5 Shuttle Carrier===
Lockheed proposed a twin body C-5 as a [[Shuttle Carrier Aircraft]] to counter the [[Conroy Virtus]], but the design was turned down in favor of the [[Boeing 747]].<ref>{{Cite web|url=http://up-ship.com/blog/?p=3847|title=Shuttling the Shuttle: Twin fuselage C-5 Galaxy – The Unwanted Blog|website=up-ship.com}}</ref><ref>{{Cite web|title=Tails through time|date=24 January 2011|url=http://aviationtrivia.blogspot.co.uk/2011/01/747-shuttle-carrier-aircraft-sca.html}}</ref>

[[File:C5 galaxy.jpg|thumb|People in line to enter the 445th Airlift Wing's first C-5A Galaxy in 2005]]
[[File:Lockheed C-5B Galaxy (L-500), USA - Air Force AN0568811.jpg|thumb|C-5B Galaxy at [[Rhein-Main AB]]]]
[[File:C-5B Arrival At CYQB.jpg|thumb|A C-5 landing at [[Québec City Jean Lesage International Airport]] (CYQB)]]
[[File:KC-46 Refuels C-5M 4-2019.jpg|thumb|A [[Boeing KC-46 Pegasus]] refuels a C-5M Galaxy from Travis AFB over California, April 2019.]]
[[File:DSRV 2 Avalon 1.jpg|thumb|Loading a [[Mystic-class deep-submergence rescue vehicle]] onto a C-5]]
[[File:CH-53E loaded on C-5A Davis-Monthan 2005.jpg|thumb|Loading a [[Super Stallion]] on a C-5A]]