Gulfstream IV

==Variants==

===C-20F/G/H/J military variants===
[[File:Gulfstream Aerospace C-20F Gulfstream IV (G-IV), USA - Army AN1831074.jpg|thumb|[[U.S. Army]] C-20F]]

The U.S. military variant of the IV, designated ''C-20F/G/H/J Gulfstream IV'' in [[United States Department of Defense|Department of Defense]] service.<ref name="DoD 4120L">[https://web.archive.org/web/20070930200603/http://www.dtic.mil/whs/directives/corres/pdf/412015l.pdf  DoD 4120-15L, ''Model Designation of Military Aerospace Vehicles'']. US DoD, 12 May 2004.</ref>  The ''C-20F'' is a GIV model operated by the [[U.S. Army]] in a command/executive transport role.

The ''C-20G'' aircraft<ref>{{Cite web|url=https://www.airliners.net/photo/USA-Navy/Gulfstream-Aerospace-C-20G-Gulfstream-IV-G-IV/606801|title=Aviation Photo #0606801: Gulfstream Aerospace C-20G Gulfstream IV (G-IV) - USA - Navy|website=Airliners.net}}</ref> may be configured for cargo operations, 26 passenger operations or combinations of the two. With passengers seats removed, it may be configured as three pallets with no passengers or two pallets and eight passengers or one pallet and fourteen passengers. With full seating, the aircraft is capable of accommodating up to twenty-six passengers and a crew of four. A hydraulically operated cargo door is installed on the starboard side of the aircraft, and a ball roller cargo floor is capable of accommodating [[palletized cargo]].  The C-20G was operated by Fleet Logistics Support Squadron Four Eight (VR-48) at [[Naval air station#United States Navy|Naval Air Facility]], [[Andrews Air Force Base]], Maryland before its 2012 deactivation. It is operated by VMR Detachment Kaneohe Bay, [[Marine Corps Air Station Kaneohe Bay]], [[Marine Corps Base Hawaii]].<ref>Wings of Gold, Vol. 36, No. 3, Fall 2011, Association of Naval Aviation, Alexandria, VA, pp.18-21</ref> The C-20G is also known as the "Grey Ghost"<ref>[http://www.pearlharborvisitorcenter.com/archives/The_Grey_Ghost.html The Grey Ghost] {{webarchive|url=https://web.archive.org/web/20110704105551/http://www.pearlharborvisitorcenter.com/archives/The_Grey_Ghost.html |date=2011-07-04 }} Hawaii Reporter: Dispatches from the War on Terrorism, September 24, 2004</ref>

The ''C-20H'' is a GIV-SP model operated by the [[U.S. Air Force]] in a command/executive transport role.  The ''C-20J'' is a GIV-SP model operated by the U.S. Army in a command/executive transport role.

The [[United States Department of Defense]] C-20A/B/C/D/E aircraft are all [[Gulfstream III]] variants.

===G350/G450===
[[File:TC-KHB G450 pvt (7950005974).jpg|thumb|The G450 (GIV-X) is {{cvt|12|in|cm}} longer and the main door is moved aft, it has updated engines, flight deck and systems.]]

The '''G450''' is a designation for the model '''GIV-X''', approved by the FAA on August 12, 2004, as is the '''G350''', which has a reduced fuel capacity. Compared to the '''Gulfstream IV''', its fuselage is 12 inches longer and the main entry door relocated aft. The [[Rolls-Royce RB.183 Tay|Rolls-Royce Tay]] 611 engines are replaced by 611-8Cs with FADEC, redesigned thrust reversers, nacelles and pylons which increases range and payload, coupled with  aerodynamic improvements. Many [[Gulfstream V-SP]] improvements are used: the [[Honeywell]] advanced flight deck display suite, electrical power generation, cabin temperature control and pressurization, nose and nose landing gear. It also has an improved APU and flap/stab actuation system, redesigned main landing gear wheels and brakes, flight control system hard-over protection system.<ref name= typeCert>{{cite web |url= http://rgl.faa.gov/Regulatory_and_Guidance_Library/rgMakeModel.nsf/0/2d504046f9657ec386257f610074fcfb/$FILE/A12EA_Rev46.pdf |title= Type Certificate date Sheet NO. A12EA, revision 46 |publisher= FAA |date= February 22, 2016}}</ref>

By the end of the G450 production run, 365 aircraft were produced, with prices ranging from $15 million to $32 million.<ref>{{cite news |url= http://aviationweek.com/business-aviation/operational-look-gulfstreams-g450 |title= An Operational Look at: Gulfstream's G450 |date= November 24, 2014 | first = Fred | last = George |work= Business & Commercial Aviation}}</ref>