Grumman S-2 Tracker

File:Grumman Tracker starboard wing fold mechanism.JPG

The Tracker was intended as a replacement for the Grumman AF Guardian,Francillon 1989, p. 351 which was the first purpose-built aircraft system for anti-submarine warfare. The Guardian operated in two aircraft "hunter-killer" pairs, with one aircraft (the AF2-W) carrying the detection gear to find the submarine and to direct the second aircraft, the AF-2S, which carried weapons to attack and destroy the submarine.Sullivan 1990, p. 4 The Tracker combined both functions in one aircraft, saving deck space aboard carriers and making for more efficient operations. Grumman's design (model G-89) was for a large high-wing monoplane with twin Wright Cyclone R-1820 nine cylinder radial engines, a yoke type arrestor hook and a crew of four. Both the two XS2F-1 prototypes and 15 S2F-1 production aircraft were ordered at the same time, on 30 June 1950. The first flight was conducted on 4 December 1952, and production aircraft entered service with VS-26, in February 1954.

Follow-on versions included the WF Tracer and TF Trader, which became the Grumman E-1 Tracer and Grumman C-1 Trader in the tri-service designation standardization of 1962. The S-2 carried the nickname "Stoof" (S-two-F) throughout its military career; and the E-1 Tracer variant with the large overhead radome was colloquially called the "stoof with a roof.".O'Rourke, G.G., Captain USN. "Of Hosenoses, Stoofs, and Lefthanded Spads". United States Naval Institute Proceedings, July 1968.

Grumman produced 1,185 Trackers and another 99 aircraft carrying the CS2F designation were manufactured in Canada under license by de Havilland Canada. U.S.-built versions of the Tracker were sold to various nations, including Australia, Japan, Turkey and Taiwan.

{{Unreferenced section|date=April 2013}}

File:USS Lexington (CV-16), January 1963, S-2 Tracker on cat.jpg

The Tracker had an internal torpedo bay capable of carrying two lightweight aerial torpedoes or one nuclear depth charge.{{cite web|url=http://www.s2tracker.com/Tracker%20page.htm|title=Grumman S-2 Tracker|work=s2tracker.com|access-date=19 January 2016|archive-url=https://web.archive.org/web/20110514222909/http://www.s2tracker.com/Tracker%20page.htm|archive-date=14 May 2011|url-status=dead}} There were six underwing hard points for rocket pods and conventional depth charges or up to four additional torpedoes. A ventrally-mounted retractable radome for AN/APS-38 radar and a Magnetic Anomaly Detector (MAD) AN/ASQ-8 mounted on an extendable rear mounted boom were also fitted. Early model Trackers had an Electronic Support Measures (ESM) pod mounted dorsally just aft of the front seat overhead hatches and were also fitted with a smoke particle detector or "sniffer" for detecting exhaust particles from diesel-electric submarines running on snorkel.{{cite web | title = RAN Aircraft Hoisting – Changing Techniques | publisher = Naval Historical Society of Australia | date = September 2000 | author = Vickridge, G.L.W., Lieutenant, RANR | work = Naval Historical Review | url = https://www.navyhistory.org.au/ran-aircraft-hoisting-changing-techniques/2/ | access-date = 1 September 2017}} Later S-2s had the sniffer removed and had the ESM antennae moved to four rounded extensions on the wingtips. A 70-million-candlepower searchlight was mounted on the starboard wing. The engine nacelles carried JEZEBEL sonobuoys in the rear (16 in early marks, 32 in the S-2E/G). Early Trackers also carried 60 explosive charges, dispensed ventrally from the rear of the fuselage and used to create sound pulses for semi-active sonar (JULIE) with the AN/AQA-3 and later AQA-4 detection sets, whereas the introduction of active sonobuoys (pingers) and AN/AQA-7 with the S-2G conversion saw these removed. Smoke dispensers were mounted on the port ventral surface of the nacelles in groups of three each.{{cite web|url=http://www.warbirdalley.com/c1.htm |title=Grumman C-1 Trader / S-2 Tracker |publisher=Warbird Alley |date=1952-12-04 |access-date=2013-07-26}}{{cite web |url=http://www.s2ftracker.com/TrackerHistory.htm |title=Tracker History |publisher=S2ftracker.com |date=1952-12-04 |access-date=2013-07-26 |url-status=dead |archive-url=https://web.archive.org/web/20131019221541/http://s2ftracker.com/TrackerHistory.htm |archive-date=19 October 2013 }}

File:Grumman TS-2A 133264 VT-28 MIA 18.07.76 edited-3.jpg

The Tracker was eventually superseded in U.S. military service by the Lockheed S-3 Viking; the last USN Tracker operational squadron (VS-37 with S-2G models) was disestablished in 1976. The last Navy S-2 was withdrawn from service on 29 August 1976.[https://web.archive.org/web/20010621174759/http://www.history.navy.mil/avh-1910/PART10.PDF "The Seventies."] history.navy.mil. Retrieved: 15 June 2010. For many years the TS-2A version of the Tracker was used by U.S. Navy training units, culminating with its use by Training Squadron 27 (VT-27), Training Squadron 28 (VT-28) and Training Squadron 31 (VT-31) for Student Naval Aviator training in the multi-engine pipeline with Training Air Wing FOUR (TRAWING 4) at Naval Air Station Corpus Christi, Texas.{{citation needed|date=July 2022}}

A number of Trackers live on as firefighting aircraft while the design also continued to provide excellent service with the naval forces of other countries for years after the U.S. retired them. For example, the Royal Australian Navy continued to use Trackers as front line ASW assets until the mid-1980s.{{cite web |title=Grumman S-2E/G Tracker |website=Royal Australian Navy |url=https://www.navy.gov.au/aircraft/grumman-s-2eg-tracker |access-date=6 July 2022}}

File:S2T2AS21COAN.jpg S-2T Turbo Tracker in hangar with wings folded.]]

Argentine Naval Aviation received seven S-2As in 1962, six S-2Es in 1978, and three S-2Gs in the 1990s.{{citation needed|date=July 2022}} They were operated from both aircraft carriers, {{ship|ARA|Independencia|V-1|6}} and {{ship|ARA|Veinticinco de Mayo|V-2|6}}, and used in the carrier onboard delivery (COD) (US-2A conversions,Jackson, David D. [http://www.s2ftracker.com/argentinatrackers.htm "Grumman S2F / S-2 Trackers in service with the Argentina Navy."] {{webarchive|url=https://web.archive.org/web/20131019141822/http://s2ftracker.com/argentinatrackers.htm |date=19 October 2013 }} Surviving Grumman S2F Tracker Information Repository, 2010. Retrieved: 15 June 2010.) maritime patrol, and ASW roles. They were extensively used in the 1982 Falklands War, first from Veinticinco de Mayo, from where they detected the British task force, and then from the mainland{{usurped|1=[https://web.archive.org/web/20090814190507/http://www.institutoaeronaval.org/Malvinas/Malvinas/Escuadrilla-Aeronaval-Antisubmarina.html "Escuadrilla Aeronaval Antisubmarina." (in Spanish)]}} institutoaeronaval.org. Retrieved: 15 June 2010. when the carrier returned to port after the sinking of the cruiser {{ship|ARA|General Belgrano}}. In the 1990s, six remaining airframes were refurbished by Israel Aerospace Industries with turboprop engines as S-2T Turbo Trackers.{{citation needed|date=July 2022}} {{As of| 2010|post=,}} with the retirement of Argentina's only aircraft carrier, the Trackers were annually deployed on board Brazilian Navy aircraft carrier {{ship|Brazilian aircraft carrier|São Paulo|A12|2}} during joint exercises ARAEX and TEMPEREX.{{Verify source|date=June 2012}}[http://www.histarmar.com.ar/Armada%20Argentina/AviacionNaval/AS-Tracker.htm "Pictorial and historical data {{in lang|es}}."] histarmar.com.ar. Retrieved: 15 June 2010. and with U.S. Navy aircraft carriers during Gringo-Gaucho maneuvers.[https://www.youtube.com/watch?v=rHB6kqaG3I0 "S-2 video."] youtube.com. Retrieved: 15 June 2010.{{citation needed|date=July 2022}} {{As of|2023|post=,}} at least one S-2T was reported still operational in the maritime surveillance role.{{cite web|url=https://www.infodefensa.com/texto-diario/mostrar/4337896/530-dias-solo-158-navegacion-52-horas-vuelo|title=La Armada Argentina contabiliza en año y medio solo 158 días de navegación y 52 horas de vuelo |website=Infodefensa.com |last=Mary |first=Gonzalo |date=20 June 2023 |access-date=26 June 2023}}{{cite web |url=https://www.infodefensa.com/texto-diario/mostrar/4418248/cooperacion-regional-accion-ejercicios-combinados-armada-argentina |title=Cooperación regional en acción: ejercicios combinados de la Armada Argentina |website=infodefensa.com |language=es |last=Gonzalo |first=Mary |date=9 September 2023 |access-date=9 September 2023}}

{{main|Grumman S-2 Tracker in Australian service}}

File:845-into-the-chocks.jpg

Between 1967 and 1984 the Royal Australian Navy operated two Squadrons of S-2E and S-2G variants, based at NAS Nowra ({{HMAS|Albatross|air station|6}}).Gillett 1987, p. 206. These aircraft served with the RAN's 816 Squadron, which embarked aboard the {{sclass|Majestic|aircraft carrier}} {{HMAS|Melbourne|R21|6}} as part of the 21st Carrier Air Group whenever that ship was deployed; and with 851 Squadron, the S-2 training squadron.

Australia initially acquired 14 S-2Es.{{cite web |title=Grumman S-2E/G Tracker |publisher=Royal Australian Navy |url=https://www.navy.gov.au/aircraft/grumman-s-2eg-tracker |access-date=27 Feb 2010}} During approximately 17 years of operation of the Tracker, the RAN lost only one S-2 during aircraft operations due to an accident at sea on 10 February 1975. However, on 4 December 1976, a deliberately lit fire in a hangar at Nowra destroyed or badly damaged a large proportion of the RAN's complement of Trackers. Of the 14 original aircraft, one was away from Nowra undergoing maintenance at the time of the fire and three aircraft were damaged but only two of these were repaired. The destroyed aircraft were subsequently replaced with 16 ex-USN aircraft. The replacement aircraft were all S-2Gs, including the original aircraft modified by the USN to that status.Francillon 1989, p. 367. This saw the introduction of AQA-7 acoustic gear into RAN service and all RAN operational Trackers were subsequently modified to this standard.

The Brazilian Air Force flew Trackers from the aircraft carrier NAeL {{ship|Brazilian aircraft carrier|Minas Gerais||2}}. Both the S-2A and S-2E were used (respectively as P-16A and P-16E). At the end of its service in Brazilian Air Force, one S-2T Turbo Tracker was evaluated as a possible upgrade, but due high costs the program was canceled. However, in 2010 the Brazilian Navy contracted Marsh Aviation to convert four S-2Ts{{citation | url = http://defense-update.com/20141223_brazils_turbo_traders.html | title = Resurrected US Navy Traders to serve on Brazilian aircraft carrier | publisher = www.defense-update.com | date = 23 December 2014}} to Airborne Early Warning configuration and upgrade four additional Grumman C-1 Traders for tanking and carrier onboard delivery transport duties. The latter were scheduled to be back in service by 2015 and were expected to operate from the successor of Minas Gerais, NAe São Paulo.[http://www.flightglobal.com/news/articles/brazilian-traders-set-for-modernisation-365929/ "Brazilian Traders set for modernisation."] flightglobal.com, 14 December 2011 Retrieved: 23 December 2011 Following the bankruptcy of Marsh Aviation in 2009 the program suffered delays and the upgrade of the airframes was resumed in partnership with Elbit Systems's subsidiary, M7 Aerospace.{{cite web |title=Brazilian Navy restarts KC-2 Turbo Trader contract |url=https://www.flightglobal.com/news/articles/brazilian-navy-restarts-kc-2-turbo-trader-contract-406169/ |website=Flight Global |access-date=10 September 2019 |date=17 November 2014}} The decommissioning of the São Paulo in 2017 means that the Brazilian Navy does not have an immediate need for carrier-based tankers, transports and AEW aircraft, however the navy proceeded with procurement and the delivery of four tanker aircraft are expected by 2021.{{cite web |last1=Host |first1=Pat |title=LAAD 2019: Elbit Systems of America targets debut Brazil KC-2 flight |url=https://www.janes.com/article/87691/laad-2019-elbit-systems-of-america-targets-debut-brazil-kc-2-flight |website=Jane's |access-date=10 September 2019 |date=4 April 2019}}

As noted under Argentina above, Trackers of that country have been flown from the São Paulo until its decommissioning in early 2017.{{citation needed|date=July 2022}}

File:TrackerWingFolding01.JPG CP-121 Tracker from VU-33 folds its wings while taxiing at CFB Moose Jaw in 1982]]

In 1954, de Havilland Canada (DHC) entered into a contract to build 100 Trackers under license to replace the outmoded Grumman TBM-3E Avengers being used by the Royal Canadian Navy (RCN). 99 Trackers were actually built by DHC, with the first Canadian-built aircraft flying on 31 May 1956. From 1957 onwards, these aircraft operated from the newly deployed aircraft carrier {{HMCS|Bonaventure|CVL 22|6}} and various shore bases.Cummings 1988, pp. 180–182. All the Canadian Trackers were built to the earlier "A" model airframe design with a length of {{convert|42|ft|m}}Taylor 1987 (cf. {{convert|43|ft|6|in|m|abbr=on}} for later model Trackers) in order to fit in Bonaventure{{'}}s hangar.[http://www.airforce.forces.gc.ca/v2/equip/hst/tracker-eng.asp "de Haviland Grumman CP-121 Tracker."] {{webarchive|url=https://web.archive.org/web/20101205231250/http://www.airforce.forces.gc.ca/v2/equip/hst/tracker-eng.asp |date=5 December 2010 }} airforce.forces.gc.ca. Retrieved: 19 November 2012. In 1960–1961, 17 CS2F-1 aircraft, which had been relegated to training and utility duties by the CS2F-2, were transferred to the Royal Netherlands Navy. From 1964, 45 CS2F-2s were upgraded by fitting revised electronic equipment and sensors, becoming CS2F-3s. Also in 1964, a pair of CS2F-1 aircraft were stripped of armament and ASW electronics, converted to transports, and subsequently used for carrier onboard delivery.Cummings 1988, p. 182. The CS2F-1, -2, and -3 were redesignated as the CP-121 Mk.1, Mk. 2, and Mk. 3 respectively following the unification of Canadian forces in 1968.

After Bonaventure was decommissioned in 1970, all remaining Canadian Trackers were transferred to shore bases. This limited their usefulness for ASW patrols, and between 1974 and 1981 gradually all but 20 were placed in storage and the remainder were stripped of their ASW gear. The remaining active-duty Trackers served until 1990 on fisheries protection and maritime patrol duties. A handful of Trackers were kept in flying condition until the late 1990s but were no longer used for active service.Tate, Colonel D.H. [http://www.aviation.technomuses.ca/pdf/Grumman_CS2F-CP121_Tracker.pdf "Grumman CS2F / CP-121 Tracker."] {{Webarchive|url=https://web.archive.org/web/20071031032458/http://www.aviation.technomuses.ca/pdf/Grumman_CS2F-CP121_Tracker.pdf |date=31 October 2007 }} Canada Aviation and Space Museum. Retrieved: 22 March 2009.

DHC purchased a single U.S.-built S2F-1 from Grumman for testing avionics and anti-submarine systems and also for evaluating Engineering Change Proposals created by Grumman; it was initially given RCN serial number 1500 and counted as one of the 100 contracted airframes. In 1954, this aircraft was transferred to the RCN for operational testing, and assigned the test code X-500. In 1956, it was upgraded to CS2F-1 standards and assigned serial number 1501; it was last used as a stationary instructional airframe at Shearwater until 1972.{{cite web|title= Grumman CS2F/CP 121 Tracker |url= http://www.shearwateraviationmuseum.ns.ca/exhibits/tracker.htm |work= Shearwater Aviation Museum |accessdate= 11 April 2022|archive-url= https://web.archive.org/web/20220411115957/http://www.shearwateraviationmuseum.ns.ca/exhibits/tracker.htm|archive-date= 11 April 2022|url-status=dead }} It is not known whether this aircraft was ever assigned a U.S. Navy bureau number.{{cite web |url=http://www.joebaugher.com/navy_serials/thirdseries16.html |title=US Navy and US Marine Corps BuNos, Third Series (135774 to 140052) |last=Baugher |first=Joe |date=7 August 2023 |website=joebaugher.com |access-date=1 July 2024}}

File:S2F-1.jpg S2F-1 at Kanoya Air Base]]

The Japan Maritime Self-Defense Force received 60 S2F-1s[http://www.s2tracker.com/Tracker%20page.htm Grumman S-2 Tracker - History] {{Webarchive|url=https://web.archive.org/web/20110514222909/http://www.s2tracker.com/Tracker%20page.htm |date=14 May 2011 }} Retrieved 29 August 2016 in 1957 from U.S. stocks, and they were operated until 1984. After being received, six S2F-1s were reconfigured into four S2F-U and two S2F-C variants. The S2F-1 was nicknamed Aotaka (あおたか, Blue Hawk). They were replaced by the Lockheed P-3 Orion.[http://home.planet.nl/~roden171/operatorse.html S-2 Website: Operators in past and present] Retrieved 29 August 2016

File:Het Grumman S2F-1 (S-2A) Tracker onderzeebootbestrijdingsvliegtuig 154 met opgeklapte vleugels (2097 045 078203).jpg

The Netherlands Naval Aviation Service (Marineluchtvaartdienst - MLD), the air arm of the Royal Netherlands Navy, received 28{{cite web|url=http://www.aeroflight.co.uk/waf/neth/mld/types/trackerS-2.htm |title=Netherlands Naval Aviation Service |publisher=Aeroflight.co.uk |access-date=2013-07-26}} S-2A (S2F-1) aircraft under MDAP from the US Navy in 1960. An additional 17{{cite web|url=http://www.aeroflight.co.uk/waf/neth/mld/types/trackerCS-2.htm |title=Netherlands Naval Aviation Service |publisher=Aeroflight.co.uk |access-date=2013-07-26}} Canadian-built CS-2A (CS2F-1) aircraft formerly operated by the Royal Canadian Navy were delivered between December 1960 and September 1961 after being overhauled by Fairey Canada. These aircraft were operated from Valkenburg Naval Air Base as well as from the light aircraft carrier {{HNLMS|Karel Doorman|R81|2}} until a fire in 1968 took that ship out of Dutch service.{{cite web|url=http://www.steelnavy.com/KDoorman.htm |title=KDoorman |publisher=Steelnavy.com |access-date=2013-07-26}}

A total of 18 aircraft were converted to S-2N (for Netherlands) standard by Fairey Canada in 1968–1970 for ASW and MR use with 1 Sqn (at Hato International Airport), of which four were converted to US-2N trainer/transport standards in May 1971. Most of the de Havilland Canada-built CS-2As were scrapped by 1970 or used for ground instruction. The last Tracker in MLD service was withdrawn in January 1976, with some transferred to the Turkish Navy.

File:Escuadron12.jpg

The Peruvian Navy operated with S-2E and S-2G from 1975 until 1989, they were assigned to Naval Aviation Squadron N°12 (Escuadron Aeronaval N°12). A total of 12 S-2Es were bought from the U.S. Navy in 1975 and 4 S-2G in 1983.

The Republic of China Air Force initially operated the S-2A in 1967. In 1976, they received S-2Es. The S-2As were later converted into target aircraft and later decommissioned in batches from 1979 to 1992. In 1986, several S-2Gs were purchased to make up for attrition. A modernization program began the same year, converting the remaining S-2E/G to a military S-2T configuration. The conversion involved the installation of two Garrett/Honeywell TPE-331-15AW turboprop engines, each rated at 1,227 kW (1,645 shp), with four-blade propellers This resulted in a payload increase of 500 kg. The upgrade also included new mission equipment of AN/AQS-92F digital sonobuoy processor, A/NARR-84 99-channel sonobuoy receiver, Litton AN/APS-504 radar, AN/ASQ-504 MAD and AN/AAS-40 FLIR.[http://www.taiwanairpower.org/navy/s2t.html "Northrop Grumman S-2T Turbo Tracker."] taiwanairpower.org, 19 October 2008. Retrieved: 22 September 2010.

The 27 S-2Ts upgraded were transferred to the ROCN Aviation Command on 1 July 1999. In 2013, the S-2s were transferred back into ROCAF service. In May 2017, all S-2Ts were withdrawn from active service.

File:S-2 Tracker at Istanbul 5408.jpg ]]

The Turkish Navy received a number of ex-U.S. Navy S-2E Trackers under the MAP program and operated them from the Cengiz Topel Naval Air Base starting in the 1960s. These were later supplemented by retired S-2A (or S-2N as called by the Dutch) airframes from Netherlands. Turkish Trackers were retired in 1994 after a series of accidents caused by the advanced age and fatigue of the airframes.[http://artofabandonment.com/2013/12/the-airplane-graveyard-the-complete-story/ The Airplane Graveyard - The Complete Story] Retrieved 30 August 2016

File:Grumman S-2G.jpg

The Uruguayan Navy received the first three S-2A Trackers on 10 April 1965 at the Capitan Curbelo Navy Base. On 15 September 1982, one S-2G arrived. On 2 February 1983, another two S-2Gs arrived. By September 2004, the remaining Uruguayan Trackers were not in flight condition.Jackson, David D. [http://www.s2ftracker.com/uruguaytrackers.htm "Uruguay Museum or Outside Display S2F / S-2 Grumman Trackers."] {{webarchive|url=https://web.archive.org/web/20101029175425/http://www.s2ftracker.com/uruguaytrackers.htm |date=29 October 2010 }} Surviving Grumman S2F Tracker Information Repository, 2010. Retrieved: 23 August 2010.

From the late 1970s until the mid-1990s Conair Aviation of Abbotsford, British Columbia, Canada took possession of retired Canadian and U.S. Trackers and converted them into Firecats, with a four-door fire retardant tank replacing the weapons bay and adjacent mid-fuselage section. Firecats were made in two variants: the piston-engined Firecat and the turboprop-powered Turbo Firecat.{{Citation needed|date=April 2023}}

In 1958, CAL FIRE, then CDF, contracted with a private air tanker service for the use of their converted World War II aircraft. By 1970 the department began to evaluate the use of former military Grumman S-2 aircraft. Over the next ten years CAL FIRE continued to build up its fleet of S-2A air tankers and in 1987, CAL FIRE began the process of converting their piston engines to turboprop. By 2005 all of CAL FIRE's airtanker fleet had been converted to S-2T air tankers."Firefighting Aircraft Recognition Guide." Firefighting Aircraft (n.d.): 1. http://calfire.ca.gov/communications/downloads/fact_sheets/Aviation_Firefighting_webbooklet.pdf {{Webarchive|url=https://web.archive.org/web/20150127173547/http://calfire.ca.gov/communications/downloads/fact_sheets/Aviation_Firefighting_webbooklet.pdf |date=27 January 2015 }}. Cal. Fire. Web. 8 October 2014.

The Tracker was considered for Turkey's firefighting aircraft project. The project, which began in the late 1990s, never went beyond the conversion of a single prototype.{{Cite web |last=Oryx |title=Fire Boss - Türkiye's S-2 Tracker Aerial Firefighter |url=https://www.oryxspioenkop.com/2023/01/fire-boss-turkiyes-s-2-tracker-aerial.html |access-date=2023-01-05 |website=Oryx}} The Turkish Navy had retired its entire Tracker fleet 1994, so these aircraft were readily available for modification.{{Cite web |title=TPE331 Turboprop Engine |url=https://aerospace.honeywell.com/us/en/products-and-services/product/hardware-and-systems/engines/tpe331-turboprop-engine |access-date=2023-01-05 |website=aerospace.honeywell.com |language=en-US}} Turkish Aerospace Industries (TAI) undertook a study in 1997 to investigate if it was possible to convert any of these S-2Es for firefighting.{{Cite web |title=Turkey S2F Trackers |url=https://www.grummantracker.com/turkeytrackers.htm |access-date=2023-01-05 |website=www.grummantracker.com}} After re-engining with Honeywell TPE331 turboprop engines, at a cost of about $3 million per aircraft, it was expected to provide at least twenty years of service.{{Cite web |title=Reklam Engelliyici |url=https://www.sozcu.com.tr/reklam-engelleyici |access-date=2023-01-05 |website=www.sozcu.com.tr |archive-date=13 May 2023 |archive-url=https://web.archive.org/web/20230513144546/https://www.sozcu.com.tr/reklam-engelleyici |url-status=dead }}

TAI ordered an S-2T Turbo Tracker upgrade kit for conversion of one of the S-2Es. Following its conversion in 1999, the aircraft was used during the 1999 Antalya wildfires and the Tüpraş Izmit Oil Refinery fire, started after the 1999 İzmit earthquake. Although up to fifteen aircraft were intended to be converted, the project was cancelled in 2002 for unclear reasons. TAI's Flight Test Engineering Group flew the lone converted aircraft as a testbed for new technology until the mid-2010s.

File:S2F-1 armed HVAR NAN5-54.jpg

File:S2F-1production line Bethpage NAN7-56.jpg

;XS2F-1

:Two prototype anti-submarine warfare aircraft powered by 1,450 hp R-1820-76WA engines.

;YS2F-1

:Designation of the first 15 production aircraft used for development, redesignated YS-2A in 1962.

;S2F-1

:Initial production variant with two 1,525 hp R-1820-82WA engines, re-designated S-2A in 1962, 740 built.

;S2F-1T

:Trainer conversion of S2F-1, redesignated TS-2A in 1962.

;S2F-1U

:Utility conversion of S2F-1, redesignated US-2A in 1962.

;S2F-1S

:S2F-1 conversion with Julie/Jezebel detection equipment, redesignated S-2B in 1962. Survivors converted to US-2B after removal of ASW gear.

;S2F-1S1

:S2F-1S fitted with updated Julie/Jezebel equipment, redesignated S-2F in 1962.

;S2F-2

:As S2F-1 with asymmetrical (port-side) extension of bomb bay, slightly enlarged tail surfaces, 77 built, most redesignated S-2C in 1962.

;S2F-2P

:Photo reconnaissance conversion of S2F-2, redesignated RS-2C in 1962.

;S2F-2U

:Utility conversion of S2F-2/S-2C, redesignated US-2C in 1962. Some were used as target tugs.

;S2F-3

:Enlarged forward fuselage, enlarged tail surfaces, additional fuel capacity, and enlarged engine nacelles bays for 32 sonobuoys, redesignated S-2D in 1962, 100 built.

;S2F-3S

:As S2F-3 but with Julie/Jezebel equipment, redesignated S-2E in 1962, 252 built.

;YS-2A

:YS2F-1 redesignated in 1962.

;S-2A

:S2F-1 redesignated in 1962.

;TS-2A

:S2F-1T training version redesignated in 1962 and 207 conversion from S-2A.

;US-2A

:S-2A converted as light transports/target tugs, 51 conversions.

;S-2B

:S2F-1S redesignated in 1962.

;US-2B

:Utility and target tug conversions of S-2A and S-2B; most S-2Bs were converted and 66 S-2As.

;S-2C

:S2F-2 redesignated in 1962.

;RS-2C

:S2F-2P photo-reconnaissance version redesignated in 1962.

;US-2C

:S2F-2U utility version redesignated in 1962.

File:US-2F Tracker VC-3 in flight.jpg

;S-2D

:S2F-3 redesignated in 1962.

;YAS-2D/AS-2D

:Proposed self-contained night attack aircraft to be developed under Operation Shed Light; none produced.

;ES-2D

:Electronic trainer conversion of the S-2D.

;US-2S

:Utility conversion of the S-2D.

;S-2E

:S2F-3S redesignated in 1962.

;S-2F

:S2F-1S1 redesignated in 1962.

;US-2F

:Transport conversion of S-2F.

File:S-2G and S-3A in flight 1976.jpg

;S-2G

:S-2E conversions with updated electronics (primarily AN/AQA-7 DIFAR sonobuoy processor and AN/ARR-75 sonobuoy receiver)

;CS2F-1

:Initial production run of anti-submarine warfare aircraft for Canada based on S2F-1. A total of 42 built by De Havilland Canada.

;CS2F-2

:Improved version of CS2F-1 with Litton Industries tactical navigation equipment. A total of 57 were built by De Havilland Canada.

;CS2F-3

:New designation given to 43 CS2F-2 aircraft upgraded with additional electronics.

;CP-121

:New designation given to all CS2F-1, -2, and -3 aircraft following unification of Canadian military in 1968.

;P-16A

:Brazilian Air Force designation of the S-2A.{{Cite web |title=Brazilian Military Aircraft Designations |url=https://designation-systems.net/non-us/brazil.html |access-date=2025-03-17 |website=designation-systems.net}}

;P-16E

:Brazilian Air Force designation of the S-2E.

;UP-16

:Brazilian Air Force designation for a utility variant of the S-2.

;Military S-2T Turbo Tracker For Argentina

:Upgraded S-2E with new engines and military equipment by IAI in the 1990s for the Argentine Navy. 6 upgraded.

;Military S-2T Turbo Tracker For Taiwan

:Upgraded S-2E/S-2G with new engines and military equipment by Grumman from 1986 to 1992 for the ROC Air Force. 27 upgraded.

;S-2T Turbo Tracker

:Civil conversion

;S-2AT

:Civil firefighter conversion with turboprop engines.

;S-2ET

File:Fox-firebase-cdf-s2t-N436DF-070904-08-24.jpg S-2F3AT Turbine Tracker landing at Fox Field, Lancaster, California, while fighting the 2007 North Fire]]

:Civil conversion

;Marsh Aviation S-2F3AT Turbo Tracker

:Turboprop conversion, powered by two Garrett TPE331 engines;[http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NNumbertxt=436DF "Marsh S-2F3AT Turbo Tracker."] {{Webarchive|url=https://web.archive.org/web/20120328181213/http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NNumbertxt=436DF |date=28 March 2012 }} FAA registry entry showing manufacturer, model and engine type. Retrieved: 15 June 2010. A total of 22 are operated by the CDF.

;Conair Firecat or Turbo Firecat

:Civil conversion as a single-seat firefighting aircraft.

;P-16H

:Brazilian Air Force designation of the Turbo Tracker.

• For the crew trainer/transport version based on the Tracker refer to Grumman C-1 Trader
• For the Airborne Early Warning version based on the Trader refer to Grumman E-1 Tracer

File:Argentine S-2T landing on carrier Sao Paulo 2006.jpg

File:Final approach to HMAS Melbourne.jpg]]

File:S2G-lands-on-melbourne.jpg

File:S2F－C.jpg S2F-C]]

;{{ARG}}

• Argentine Naval Aviation 15 ex-USN trackers{{cite web |url=http://www.s2ftracker.com/argentinatrackers.htm |title=Argentina S2F Trackers |publisher=S2ftracker.com |access-date=2014-01-07 |url-status=dead |archive-url=https://web.archive.org/web/20131019141822/http://s2ftracker.com/argentinatrackers.htm |archive-date=19 October 2013 }}

;{{AUS}} (retired)

• Royal Australian Navy

;{{BRA}} (retired)

• Brazilian Air Force
• Brazilian Navy

;{{CAN}} (retired)

• Royal Canadian Navy 99 - 42 CSF-1 and 57 CSF-2 (43 converted as CSF-3) (1956–1968) transferred to CF during unification as CP-121 {{cite web|author=Jerry Proc |url=http://jproc.ca/rrp/rrp3/tracker.html |title=Radio Research Paper - Tracker In Canadian Service |publisher=Jproc.ca |access-date=2014-01-07}}
• VS-880
• VU-32 Utility Squadron{{cite web|url=http://www.canadianwings.com/Squadrons/squadronDetail.php?Utility-Squadron-VU-32-107 |title=Utility Squadron VU 32 |year=2012 |work=AEROWAREdesigns |access-date=12 May 2022 |url-status=usurped |archive-url=https://web.archive.org/web/20120806145622/http://www.canadianwings.com/Squadrons/squadronDetail.php?Utility-Squadron-VU-32-107 |archive-date=6 August 2012}}
• Canadian Forces 99 CP-121 (1968–1990)

;{{ITA}} (retired)

• Italian Air Force operated 45 Grumman S2F-1 Tracker delivered in 1957 and retired in 1978{{cite web|url=http://www.aeroflight.co.uk/waf/italy/af/ital-af2-all-time.htm|title=Italian Air Force Aircraft Types|work=aeroflight.co.uk|access-date=19 January 2016}}

;{{JPN}} (retired)

• Japan Maritime Self-Defense Force
• Air Transport Squadron 61

;{{NLD}} (retired)

• Royal Netherlands Navy

;{{PER}} (retired)

• Peruvian Navy

;{{KOR}} (retired)

• Republic of Korea Navy

;{{TWN-ROC}} (retired)

• Republic of China Air Force operated S-2A/E/G from 1967 to 1992, S-2T from 1992 to 2017, replaced by 12 rebuilt U.S. Navy P-3C Orions.

;{{THA}} (retired)

• Royal Thai Navy{{citation|url=http://www.worldairforces.com/countries/thailand/thl.html|title=World Air Forces – Historical Listings Thailand (THL)|access-date=30 August 2012|url-status=dead|archive-url=https://web.archive.org/web/20120125054737/http://www.worldairforces.com/Countries/thailand/thl.html|archive-date=25 January 2012}}

;{{TUR}} (retired)

• Turkish Navy Aerial Wing

;{{USA}} (retired)

• United States Navy operated Trackers between 1954 and 1976.
• United States Marine Corps operated some Trackers.

;{{URY}} (retired)

• Uruguayan Navy

;{{VEN}} (retired)

• Venezuelan Navy

File:Cdf-s2-tanker71-sawtooth complex fire-01.jpg S-2T conducting firefighting air drops on the Sawtooth Complex fire, 2006]]

File:Tracker2.jpg

Many retired Trackers were sold to private owners for fire-fighting duties. Some were rebuilt and re-engined with turboprop engines.

;{{CAN}}

• Conair Group Inc. acquired a total of 82 CS2F and S2F Trackers, converting 32 airframes to Firecats and 13 - including 9 previously-converted Firecats - to Turbo Firecats.{{Citation needed|date=April 2023}}
• Saskatchewan Ministry of Environment operated 6 CS2F Field Aviation conversions and 1 replacement Conair Firecat.
• Ontario Ministry of Natural Resources operated 6 CS2F Field Aviation conversions; later sold to Conair[http://www.bushplane.com/grumman-cs2f-tracker-canadian-bushplane-heritage "Grumman CS2F Tracker."] {{webarchive|url=https://web.archive.org/web/20111001085851/http://www.bushplane.com/grumman-cs2f-tracker-canadian-bushplane-heritage |date=1 October 2011 }} Canadian Bushplane Heritage Centre, 2011. Retrieved: 10 July 2011.

;{{FRA}}

• Sécurité Civile received Conair Firecats and Turbo Firecats.

;{{NLD}}

• KLM used ex-Dutch Navy Tracker to train its mechanics.

;{{USA}}

• California Department of Forestry & Fire Protection (CAL FIRE) operates S-2F3AT Turbo Tracker (G-121) aircraft as aerial firefighting air tankers.
• Hemet Valley Flying Service received TS-2A(FF) Tracker (G-89)
• Marsh Aviation received S-2A(FF) Tracker (G-89)
• Sis-Q Flying Service received TS-2A Tracker (G-89/S2F-1T)
• Aero Union, in addition to being an operator, Aero Union developed the prototype S-2 tankers for the State of California in 1973.[http://p2vneptune.com/f01.shtml "P2V Neptune."] p2vneptune.com. Retrieved: 15 June 2010.

{{main|List of displayed Grumman S-2 Trackers}}

Although still in active service in South America, numbers of Trackers are on public display, mainly in countries that formerly operated the type.

File:Grumman S-2 Tracker drawing.png

{{Aircraft specs

|ref=Canada Aviation and Space Museum

|prime units?=kts

|crew=4

|length ft=43

|length in=6

|length note=

|span ft=72

|span in=7

|span note=

|height ft=17

|height in=6

|height note=

|wing area sqft=485

|wing area note=

|aspect ratio=

|airfoil=

|empty weight lb=18315

|empty weight note=

|gross weight lb=23435

|gross weight note=

|max takeoff weight lb=26147

|max takeoff weight note=

|fuel capacity=

|more general=

|eng1 number=2

|eng1 name=Wright R-1820-82WA

|eng1 type=9-cylinder air-cooled radial piston engines

|eng1 hp=1525

|eng1 note=

|prop blade number=

|prop name=

|prop dia m=

|prop dia ft=

|prop dia in=

|prop dia note=

|max speed kts=243

|max speed note=at sea level

|cruise speed kts=130

|cruise speed note=

|stall speed kts=

|stall speed note=

|never exceed speed kts=

|never exceed speed note=

|minimum control speed kts=

|minimum control speed note=

|range nmi=1173

|range note=

|combat range nmi=

|combat range note=

|ferry range nmi=

|ferry range note=

|endurance=9 hours endurance

|ceiling ft=22000

|ceiling note=

|g limits=

|roll rate=

|glide ratio=

|climb rate ftmin=

|climb rate note=

|time to altitude=

|sink rate ftmin=

|sink rate note=

|lift to drag=

|wing loading lb/sqft=48.3

|wing loading note=

|fuel consumption lb/mi=

|power/mass=

|thrust/weight=

|more performance=

|armament=

• {{convert|4800|lb|abbr=on}} of payload could be carried in the internal bomb bay and on 6× under-wing hardpoints
• Torpedoes: Mk. 41, Mk. 43, Mk. 34, Mk. 44, or Mk. 46
• Depth charges: Mk. 54 or naval mines

|avionics=

}}

{{Portal|Aviation}}

{{aircontent

|related=

• Grumman C-1 Trader
• Grumman E-1 Tracer

|similar aircraft=

• Grumman AF Guardian
• Fairey Gannet
• Bréguet 1050 Alizé
• Lockheed S-3 Viking

|lists=

|see also=

}}

{{Reflist|group=note}}

{{Reflist}}

• Cummings, Bill. "Thirty Years and Still Counting: Grumman Trackers in Canadian Service". Air International, Vol. 34, No. 4, April 1988. pp. 180–188.
• Francillon, René J. Grumman Aircraft since 1929. London: Putnam Aeronautical Books, 1989. {{ISBN|0-85177-835-6}}.
• Gillett, Ross. Australia's Military Aircraft. Sydney, Australia: Aerospace Publications Pty Ltd, 1987. {{ISBN|0-7316-0363-X}}.
• Hotson, Fred W. The de Havilland Canada Story. Toronto, Ontario, Canada: CANAV Books, 1983. {{ISBN|0-07-549483-3}}.
• Stitt, Robert. "Round-Out". Air Enthusiast, No. 65, September–October 1996, p. 76. {{ISSN|0143-5450}}.
• Sullivan, Jim. S2F Tracker in Action Aircraft number 100, Carrollton, TX: Squadron/Signal Publications, 1990. {{ISBN|0-89747-242-X}}.
• Taylor, Michael, ed. Encyclopedia of Modern Military Aircraft. New York: Gallery Books, 1987. {{ISBN|0-8317-2808-6}}.
• Winchester, Jim (ed.). "Grumman S-2E/F/G/UP Tracker." Modern Military Aircraft (Aviation Factfile). Rochester, Kent, UK: Grange Books, 2004. {{ISBN|1-84013-640-5}}.

• {{Cite book |last1=Núñez Padin |first1=Jorge Felix |title=S-2 Tracker & Turbo Tracker |editor-first=Jorge Felix |editor-last=Núñez Padin |publisher=Fuerzas Aeronavales |series=Serie Aeronaval |volume=26 |language=es |location=Bahía Blanca, Argentina |url=http://www.fuerzasaeronavales.com/?product=libro-s-2-tracker-turbo-tracker-serie-aeronaval-no26 |access-date=2014-09-10 |url-status=dead |archive-url=https://web.archive.org/web/20150528183018/http://www.fuerzasaeronavales.com/?product=libro-s-2-tracker-turbo-tracker-serie-aeronaval-no26 |archive-date=28 May 2015 }}

{{Commons category}}

• [https://web.archive.org/web/20131217165035/http://www.s2ftracker.com/index.htm Surviving Grumman S2F Tracker Information Repository]
• [https://web.archive.org/web/20181019195545/http://www.s2tracker.com/ The S-2 Tracker Museum]
• [https://web.archive.org/web/20030424142132/http://www.paxmuseum.com/s2/S2.htm S-2 Tracker at Patuxent River Naval Air Museum]

{{Navboxes

|title=Articles and topics related to the Grumman S-2 Tracker

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|list1=

{{Grumman aircraft}}

{{de Havilland Canada}}

{{USN ASW aircraft}}

{{US ASW aircraft}}

{{CF aircraft}}

{{Aircraft manufactured in Canada}}

{{FAB aircraft designations}}

}}

{{Authority control}}

Category:Aircraft first flown in 1952

Category:1952 establishments in the United States

Category:1950s United States anti-submarine aircraft

Category:United States Navy in the 20th century

S-002 Tracker

Category:High-wing aircraft

Category:Carrier-based aircraft

Category:Twin piston-engined tractor aircraft

Category:Aircraft with retractable tricycle landing gear