Gulfstream IV

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{{Redirect-distinguish|Gulfstream G400|Gulfstream G400/G500/G600}}
{{short description|Family of private twinjet aircraft manufactured by Gulfstream Aerospace}}
{|{{Infobox Aircraft Begin
  |name = Gulfstream IV 
  |image = File:G4-1 (Gulfstream).jpg
  |caption = The Gulfstream IV is a low-wing aircraft with twin aft-mounted turbofans and a T-tail, here in service of the [[United States Department of Commerce]]
}}{{Infobox Aircraft Type
  |type = [[Business jet]]
  |manufacturer = [[Gulfstream Aerospace]]
  |designer =
  |first flight = September 19, 1985
  |introduced =
  |retired =
  |status = Active service
  |primary user = [[United States Air Force]]
  |more users = [[United States Army]] <br /> [[United States Navy]] <br /> [[National Oceanic and Atmospheric Administration]]
  |produced = 1985–2018
  |number built =  900+ <ref name=161021PR/>
  |unit cost =*G350: {{AircraftCost|USA|34.9|m|year=2012|ref=<ref>{{cite news |url= http://awin.aviationweek.com/portals/awin/pdfs/BCAOpPlanningGuide/2012_Production.pdf |title= Operations Planning Guide |work= Business & Commercial Aviation |date= 2012 |publisher= Aviation Week}}</ref>}}
*G450: {{AircraftCost|USA|41|m|year=2015|ref=<ref>{{cite news |url= http://aviationweek.com/site-files/aviationweek.com/files/uploads/2015/05/Business%20Airplane%20Tables_May_2015_revised.pdf |title= Business Jets Specification and Performance Data |publisher= Aviation Week |work= Business & Commercial Aviation |date= May 2015 |access-date= 2016-06-22 |archive-date= 2016-09-09 |archive-url= https://web.archive.org/web/20160909224622/http://aviationweek.com/site-files/aviationweek.com/files/uploads/2015/05/Business%20Airplane%20Tables_May_2015_revised.pdf |url-status= dead }}</ref>}} 
  |developed from = [[Gulfstream III]]
  |variants with their own articles =
  |developed into = [[Gulfstream V]]
}}
|}

The '''Gulfstream IV''' (or '''G-IV''' or '''GIV''') and derivatives are a famous family of [[twinjet]] aircraft, mainly for private or [[Business jet|business]] use. They were designed and built by [[Gulfstream Aerospace]], a [[General Dynamics]] company based in [[Savannah, Georgia]], [[United States]], from 1985 until 2018. Aircraft power is provided by two [[Rolls-Royce RB.183 Tay]] [[turbofans]].

Upon delivery of the last G450, over 900 GIV/GIV-SP/G450 units had been produced. The last of the G450’s was delivered on 19 January 2018 after 365 deliveries over 12 years, ending a 30-year production run, to be replaced by the [[Gulfstream G500|G500]].<ref name=161021PR>{{cite news |url= https://www.flightglobal.com/news/articles/gulfstream-launches-g500-global-demo-tour-445118/ |title= Gulfstream launches G500 global demo tour |date= 2018-01-23 | first = Kate | last = Sarsfield |work= Flightglobal}}</ref>

==Development==
[[File:Gulfstream Aerospace G-IV-X Gulfstream G450, Falcon Aviation Services AN1445085.jpg|thumb|executive cabin]]

Gulfstream, in collaboration with [[Grumman]], began work on the Gulfstream IV in March 1983 as a re-engined, stretched fuselage derivative of the [[Gulfstream III]]. 
The first GIV made its maiden flight on September 19, 1985.<ref name=Frawley_Civil_GIV/> The model received type certification from the FAA on April 22, 1987.<ref name= typeCert/> The G-IV entered into service with serial number 1000 in 1987 and was upgraded to the special purpose '''GIV-SP''' version at serial number 1214 in 1993.  It was later redesignated '''G400''' at serial number 1500.<ref name="flagship">{{cite news |url= http://aviationweek.com/awin/gulfstream-iv |title= Gulfstream IV
|work= Business and Commercial Aviation |publisher= Aviation Week |date= January 2009}}</ref>
A shorter range variant was created based on the GIV and given the '''G300''' designation in 2002.<ref name=Frawley_Civil_GIV>Frawley, Gerald. "Gulfstream IV, G300 & G400". ''The International Directory of Civil Aircraft, 2003/2004''. Fishwick, Act: Aerospace Publications, 2003. {{ISBN|1-875671-58-7}}.</ref>

In 2001, Gulfstream began work on an improved version of the GIV-SP, originally designated '''GIV-X'''.  It was later renamed '''G450'''.  The G450 is lengthened 1&nbsp;ft (0.305 m) over the G400 and shares the forward fuselage and larger cockpit of the [[Gulfstream G550|G550]].  Following its first flight on 30 April 2003, production of the G450 began in October 2004, replacing the G400.  The G450 has better performance and comes with the PlaneView cockpit with four 14-inch (355&nbsp;mm) [[liquid crystal display]]s and a [[Head up display]] (HUD).  The shorter range '''G350''' version of the G450 was developed and received certification in 2004.<ref>{{cite news |last1=Gerzanics |first1=Michael |title=Flight Test: Gulstream [sic] G450 – Heir Apparent |url=https://www.flightglobal.com/flight-test-gulstream-g450-heir-apparent/57841.article |access-date=15 October 2023 |work=Flight Global |date=22 November 2004}}</ref><ref>{{cite news |last1=Velocci |first1=Tony |title=G450 Production Coming To An End |url=http://www.forbes.com/sites/businessaviation/2016/10/22/g450-production-coming-to-an-end |access-date=15 October 2023 |work=Forbes |date=22 October 2016}}</ref>

By 2018, 1990 to 1992 GIVs were for sale at $1.6-4.4 million, 1992 to 1999 GIVSPs were listed for $1.25-5.2 million, 15-year-old G300s and G400s were available for $4.5-7 million and 2006 to 2016 G450s at $9.95-23.75 million.<ref name=AINdec2018>{{cite magazine |url= https://www.ainonline.com/sites/default/files/full-issues/ain_1218.pdf |title= For many models, market hitting the apex |magazine= Aviation International News | first = Mark | last = Huber |date= December 2018 |pages= 20–21, 24}}</ref>

==Design==
[[File:VH-MBP Gulfstream Aerospace G-IV-X Gulfstream G450 (6486143227).jpg|thumb|G450 updated flight deck]]

Compared to the [[Gulfstream III]], a decision to redesign the wing structure for weight reduction presented an opportunity for an aerodynamic redesign of the wing to reduce cruise drag and increase range. Wing contour modifications had to be restricted to the forward 65% of wing chord so that no redesign of the control surfaces would be necessary. Modification of the inboard wing would have entailed a redesign of the fuselage floor structure, consequently this region of the wing was not modified. Outboard wing modifications were aimed at reducing the peak subcritical pressure coefficient and moving it aft in an effort to reduce shock strength and increase shock sweep.<ref>Chandrasekharan, R.M., Murphy, W.R., Taverna, F.P. and Boppe, C.W., "Computational Aerodynamic of the Gulfstream IV Wing", AIAA paper 85-0427, presented at the AIAA 23rd Aerospace Sciences Meeting, Reno Nevada, January 1985.</ref>

At 12,420 lbs, the [[Rolls-Royce RB.183 Tay|Rolls-Royce Tay]] fanjet engines provided more thrust than the 11,400&nbsp;lbs of the Gulfstream III. Speed, noise levels, emissions, fuel economy, range, and cargo capacity were also markedly improved over the earlier model.<ref name=WAW220336>{{cite journal | journal = [[Ward's|Ward's Auto World]] | volume = 22 | number = 3 | publisher = Ward's Communications | date = March 1986 | page = 36 | title = Everybody takes a number | first = David C. | last = Smith }}</ref>

The Gulfstream IV wing has a weaker, more swept outboard shock resulting in a lower cruise drag. Other benefits arising from this design are a lower root bending moment due to the more inboard center of pressure, a lower stall speed due to washout and a larger fuel volume due to increased chord. These aerodynamic improvements result in an increase in range of over 300 nautical miles.<ref>Boppe, Charles W., "Computational Aerodynamic Design: X-29, the Gulfstream Series and a Tactical Fighter", SAE paper 851789, 1985 Wright Brothers Award Paper, presented at the Aerospace Technology Conference & Exposition, Long Beach California, October 1985.</ref>
In addition to the wing redesign, the Gulfstream IV also became the first business jet to have an entire glass cockpit.<ref name=thomas>{{cite web |publisher= stratos jet charters| first = Joel | last = Thomas |title= History of the Gulfstream Aerospace Corporation |url= https://www.stratosjets.com/history-of-gulfstream-aerospace-corporation/ |date= 19 May 2014}}</ref>

The G400 has a large cabin, long range of 4,350 nautical miles (8,060&nbsp;km) and the same comfort and design that characterize the G series. Maximum cruise height and speed are 45,000&nbsp;ft and [[Mach number|Mach]] 0.85. Earlier models were fitted with Honeywell's SPZ 8000 Avionics package. The SPZ 8400 Avionics Package was an option, becoming standard on later models. Its second-hand price was below $15 million (~${{Format price|{{Inflation|index=US-GDP|value=15000000|start_year=2009}}}} in {{Inflation/year|US-GDP}}) in 2009.<ref name="flagship"/> Gulfstream had also considered making a {{cvt|5.5|m|ft|0}} longer, 24-27 seat model for airline use.<ref name=WAW220336/>

==Operational history==
[[File:NOAA Gulfstream IV (N49RF) and WP-3 Hurricane Hunter (N34RF).jpg|thumb|[[National Oceanic and Atmospheric Administration|NOAA]]'s GIV and [[Lockheed WP-3D Orion|WP-3]]]]

The [[National Oceanic and Atmospheric Administration]] (NOAA) operates a GIV-SP (N49RF) modified to fly [[scientist]]s and crew members at 45,000 feet around [[tropical cyclone]]s. The aircraft was modified to drop instruments called "[[dropsonde]]s" to measure windspeed, [[barometric pressure]], [[humidity]], and temperature as they fall to the surface of the ocean. By sampling the cyclone with these dropsondes over a 4,000 mile track around the storm, the forecasters at NOAA's [[National Hurricane Center]] and [[Hurricane Research Division]] can better predict where the hurricane will be "steered" by the upper level winds. They also predict [[wind shear]] that will either increase or decrease a hurricane's strength. The GIV-SP is suited for this mission since it is fast, and can fly long distances with ample cabin space for the crew and instruments.<ref name="noaa_givsp">"[http://www.aoc.noaa.gov/aircraft_g4.htm Gulfstream IV-SP (G-IV)] {{Webarchive|url=https://web.archive.org/web/20070218124547/http://www.aoc.noaa.gov/aircraft_g4.htm |date=2007-02-18 }}." [[National Oceanic and Atmospheric Administration]] web site.</ref>  In 2009, the NOAA GIV-SP was further modified by the addition of a side-scanning [[Doppler radar]] to the rear fuselage. This radar is used for storm cloud profiling.<ref>[http://www.airliners.net/photo/NOAA/Gulfstream-Aerospace-G-IV/1566075/L Picture of the Gulfstream Aerospace G-IV Gulfstream IV-SP aircraft] Retrieved 1 November 2011.</ref>

In June 1987 a Gulfstream IV set 22 world records in its class in flying west around the world in 45 hr 25 min.  The next year another GIV set 11 world records flying east around the world.<ref name=G-IV_airliners.net>[http://www.airliners.net/aircraft-data/stats.main?id=238 "Gulfstream Aerospace G-IV"]. airliners.net</ref>  In 1990, Gulfstream [[CEO]] [[Allen Paulson]] and a Gulfstream flight crew set 35 international records for around-the-world flight in a GIV.<ref>{{cite web|last1=Lacy|first1=Clay|title=Clay Lacy on Allen Paulson|url=https://www.claylacy.com/clay-lacy-allen-paulson|publisher=Clay Lacy|access-date=19 August 2014}}</ref>

==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>

==Operators==

===Civil operators===
[[File:Mercy Jets Gulfstream Air Ambulance.jpg|thumb|Gulfstream IV [[Air Ambulance]]]]

The aircraft is operated by private individuals, companies and executive charter operators, and in [[Fractional ownership of aircraft|fractional ownership programs]].

===Government and military operators===
[[File:Gulfstream_IV_RNLAF.jpg|thumb|A Gulfstream IV of the [[Royal Netherlands Air Force]]]]
[[File:JASDF U-4 04.jpg|thumb|[[Japan Air Self-Defense Force]] U-4]]

{{BRU}}
* [[Sultan of Brunei]]<ref name="Professional Pilot Magazine">{{Cite web|url=http://jeteditor.com/tjsult.htm|title=jeteditor.com|website=ww38.jeteditor.com}}</ref>
;{{CHI}}
* [[Chilean Air Force]]<ref name="World Air Forces 2022">{{cite web |last = |first = |url= https://www.flightglobal.com/flight-international/how-afghanistans-fall-reshaped-world-air-forces-inventory/146576.article|title = World Air Forces 2022|publisher= Flightglobal Insight |year= 2022 |doi = |accessdate= 15 April 2022|url-access=registration}}</ref> 
;{{CIV}}
* [[Air Force of Ivory Coast|Côte d'Ivoire Air Force]]<ref>{{harvnb|Cooper|Weinert|Hinz|Lepko|2011|page=225}}</ref>
;{{JPN}}
* [[Japan Air Self-Defense Force]]<ref name="World Air Forces 2022"/> 
;{{MYS}}
* [[Sultan of Johor]]<ref name="Professional Pilot Magazine"/>
;{{NLD}}
* [[Royal Netherlands Air Force]]<ref>{{cite web |url=https://www.defensie.nl/organisatie/luchtmacht/materieel/vliegtuigen-en-helikopters/gulfstream-iv |title=Gulfstream IV |publisher=Netherlands Ministry of Defence |access-date=17 October 2019 |language=Dutch }}</ref>
;{{PAK}}
* [[Pakistan Air Force]]<ref>{{cite web | url=https://www.airliners.net/photo/Pakistan-Air-Force/Gulfstream-Aerospace-G-IV-Gulfstream-IV-SP/6744749?qsp=eJwtjbEOwjAQQ3%2BlupkNwdCtDKx04AdOFwuilia6Owmiqv9OUthsP8teSdLi%2BPi9ZFBPBlZ50oEyK7%2BM%2BpUmlHfSUDWNPEVzXrohandNKqhNS%2BqXUmlgxyCC7Aj//KYB2hBM9tFHOzk1CR1/7niuNkTLM%2B8rcI4zbdsXIKszaQ%3D%3D | title=Aviation Photo #6744749: Gulfstream Aerospace G-IV Gulfstream IV-SP - Pakistan - Air Force }}</ref> 
;{{SAU}}
* [[Royal Saudi Air Force]]<ref name="World Air Forces 2022"/>  
;{{SWE}}
* [[Swedish Air Force]]<ref name="World Air Forces 2022"/> 
;{{flag|Tanzania}}
* [[Tanzania Air Force Command]]<ref>{{harvnb|Cooper|Weinert|Hinz|Lepko|2011|page=232}}</ref>
;{{USA}}
* [[United States Air Force]]<ref name="World Air Forces 2022"/>  
* [[United States Army]]<ref name="World Air Forces 2022"/>   
* [[United States Navy]]<ref name="World Air Forces 2022"/>   
* [[United States Marine Corps]]<ref name="World Air Forces 2022"/>
* [[National Oceanic and Atmospheric Administration]]

=== Former military operators ===
;{{IRL}}
* The [[Irish Air Corps]] previously operated a G-IV as a government transport.<ref>{{Cite journal|url=https://www.rte.ie/news/2015/0330/690897-government-jet-sold-to-us-company/|title=Government jet sold for €462k|date=March 30, 2015|via=www.rte.ie}}</ref>
;{{UGA}}
* The Government of [[Uganda]] purchased one G-IV SP in December 2000 at a cost of US$31.5 million for Presidential flights. It was replaced in February 2009 by a [[G550]].<ref>{{cite web
 |url=http://www.observer.ug/component/content/article?id=2655:museveni-shs-88bn-jet-arrives
 |title=Museveni's Shs88 Billion Jet Arrives
 |access-date=19 May 2015
 |date=February 2009
 |newspaper=[[The Observer (Uganda)]]
 |url-status=dead
 |archive-url=https://web.archive.org/web/20150618173711/http://www.observer.ug/component/content/article?id=2655%3Amuseveni-shs-88bn-jet-arrives
 |archive-date=18 June 2015
}}</ref>

==Specifications==
[[File:Gulfstream IV-SP 3-view line drawing.png|300px|right|3-view line drawing of the Gulfstream IV-SP]]
[[File:Gulfstream IV-SP Passenger Layout.png|thumb|Passenger Layout]]

{{sticky header}}
{| class="wikitable sortable sticky-header" style="text-align: center;"
! Model
! GIV<ref name=GIVspecs>{{cite web |url= http://www.airliners.net/aircraft-data/gulfstream-aerospace-g-iv-gulfstream-iv/238 |title= Gulfstream Aerospace G-IV Gulfstream IV |work= The International Directory of Civil Aircraft |first = Gerard | last = Frawley |at= Technical Data & Specifications}}</ref>
! GIV-SP<ref name=GIVspecs/>
! G350<ref>{{cite web |url= https://www.guardianjet.com/jet-aircraft-online-tools/aircraft-brochure.cfm?m=Gulfstream-G350-129 |title= G350 Specifications |publisher= Gulfstream |date= 2010}}</ref>
! G450<ref>{{cite web |url= http://www.gulfstream.com/images/uploads/brochures/aircraft/G450SpecSheet.pdf |title= G450 Specifications |publisher= Gulfstream |date= September 2015}}</ref>
|-
! Cockpit crew
|colspan=4| Two
|-
! Capacity
|colspan=4| 19
|-
! Length
|colspan=2| 88&nbsp;ft&nbsp;4&nbsp;in (26.92&nbsp;m)
|colspan=2| 89&nbsp;ft&nbsp;4&nbsp;in (27.23&nbsp;m)
|-
! Wingspan
|colspan=4| 77&nbsp;ft&nbsp;10&nbsp;in (23.72&nbsp;m)
|-
! Wing area
|colspan=4| 950.39&nbsp;sq&nbsp;ft (88.3&nbsp;m<sup>2</sup>)
|-
! Overall height
|colspan=2| 24&nbsp;ft&nbsp;5&nbsp;in (7.45&nbsp;m)
|colspan=2| 25&nbsp;ft&nbsp;2&nbsp;in (7.67&nbsp;m)
|-
! [[Maximum take-off weight|MTOW]]
| {{cvt|73200|lb|0}}
| {{cvt|74600|lb|0}}
| {{cvt|70900|lb|0}}
| {{cvt|74600|lb|0}}
|-
! Empty weight
|colspan=2| {{cvt|35500|lb|0}}
| {{cvt|42700|lb|0}}
| {{cvt|43000|lb|0}}
|-
! Cruising speed
|colspan=4| {{convert|0.80|-|0.85|Mach|altitude_ft=41000|knots km/h mph|0}}
|-
! Maximum speed
|colspan=4| {{convert|0.88|Mach|altitude_ft=41000|knots km/h mph|0}}
|-
! Range
|colspan=2| {{cvt|4220|nmi|0}}
| {{cvt|3800|nmi|0}}
| {{cvt|4350|nmi|0}}
|-
! Service ceiling
|colspan=4| {{cvt|45000|ft|0}}
|-
! Engines (×2)
|colspan=2| [[Rolls-Royce RB.183 Tay#611-8|Rolls-Royce Tay 611-8]]
|colspan=2| [[Rolls-Royce RB.183 Tay#611-8|Rolls-Royce Tay 611-8C]]
|-
! Thrust
|colspan=4| 13,850&nbsp;lbf (61.6&nbsp;kN)
|}

==See also==
{{aircontent
|related=
* [[Gulfstream III]]
* [[Gulfstream V]]
* [[Gulfstream G550|Gulfstream G500/G550]]
|similar aircraft=
|lists=
* [[List of active United States military aircraft]]
}}

==References==
===Citations===
{{reflist|2}}

===Bibliography===
*{{cite book |last1=Cooper |first1=Tom |last2=Weinert |first2=Peter |last3=Hinz |first3=Fabian |last4=Lepko |first4=Mark |title=African MiGs, Volume 2: Madagascar to Zimbabwe |date=2011 |publisher=Harpia Publishing |location=Houston |isbn=978-0-9825539-8-5}}

==External links==
{{Commons and category|Gulfstream IV}}
* {{official website|http://www.gulfstream.com/aircraft/gulfstream-g450|Gulfstream G450}}
* {{cite web |url= http://d16bsf97ryvc45.cloudfront.net/Media/2013/01/g400.pdf |title= Gulfstream IV SP Operator Survey | first = Fred | last = George |date=April 2000 |work= Business & Commercial Aviation |publisher= Aviation Week}}
* {{cite news |url= http://awin.aviationweek.com/portals/awin/Interactives/BCA/G450_pilot-report/G450_pilot-report.html |work= Business & Commercial Aviation |date= December 2003 |title= Gulfstream's 450 Surprise |publisher= Aviation Week | first = Fred | last = George}}

{{Gulfstream}}
{{US transport aircraft}}
{{Swedish military aircraft designations}}

{{DEFAULTSORT:Gulfstream Iv}}
[[Category:Gulfstream aircraft]]
[[Category:1980s United States business aircraft]]
[[Category:Twinjets]]
[[Category:T-tail aircraft]]
[[Category:Aircraft first flown in 1985]]
[[Category:Low-wing aircraft]]