MD Helicopters MD 500

{{Infobox aircraft

|name= MD 500

|image= File:Md helicopters md-500e g-sscl arp.jpg

|caption= An MD 500E

|type= Light utility helicopter

|national_origin= United States

|manufacturer= Hughes Helicopters
McDonnell Douglas Helicopter Systems
MD Helicopters

|first_flight= 27 February 1963

|introduction= 1967{{cite web |title = Hughes 369 / 500 / OH-6 |url = http://all-aero.com/index.php/home2/5034-hughes-369-500 |website = all-aero.com |access-date = 4 June 2018 |archive-date = 23 October 2018 |archive-url = https://web.archive.org/web/20181023160731/http://all-aero.com/index.php/home2/5034-hughes-369-500 |url-status = dead }}

|retired=

|status= In service

|primary_user= Korean People's Air Force
Salvadoran Air Force

|more_users=

|produced= 1967–present

|number_built= 4,700{{cite web |url = http://www.airliners.net/info/stats.main?id=113 |title = The MD Helicopters MD-500/530 |publisher = airliners.net |access-date = 16 January 2008}}

|unit cost=

|developed_from= Hughes OH-6 Cayuse

|variants= McDonnell Douglas MD 500 Defender
Boeing AH-6

|developed_into= MD Helicopters MD 600

}}

The MD Helicopters MD 500 series is an American family of light utility civilian and military helicopters. The MD 500 was developed from the Hughes 500, a civilian version of the US Army's OH-6A Cayuse/Loach. The series currently includes the MD 500E, MD 520N, and MD 530F.

The MD 500 was initially produced by Hughes Helicopters as the Hughes 500. Since being introduced in 1967, numerous models have been produced, often featuring a more powerful engine or a five-bladed main rotor in place of the original four-blade counterpart. The MD 500 has been commonly used for utility work, particularly the MD 530F; it has also proven to be popular with law enforcement agencies. Production of the type was continued into the twenty-first century by Hughes' successor companies, McDonnell Douglas Helicopter Systems, and subsequently MD Helicopters. While the MD 500 series has been largely operated by civil customers, it has occasionally seen military use, even to the extent of performing front line combat operations. The Salvadoran Air Force deployed their examples during the Salvadoran Civil War, leading to several losses. North Korea also covertly obtained a fleet of MD500s for military purposes, some of which have been allegedly configured into gunships.

Design and development

=Background=

File:hughes500.g-orrr.arp.jpg

File:hughes500.g-bioa.arp.jpg

The Hughes 500/MD 500 series can be traced back to the early 1960s and the issuing of a requirement for a Light Observation Helicopter (LOH) for the United States Army.{{cite book |last = Frawley |first = Gerard |title = The International Directory of Civil Aircraft, 2003-2004 |page = 155 |publisher = Aerospace Publications Pty Ltd |year = 2003 |isbn = 1-875671-58-7}} Following a competitive tendering process, Hughes' Model 369 was selected as the winning bid, triumphing over rival submission from the helicopter manufacturers Bell and Hiller. On 27 February 1963, under the service designation of OH-6 Cayuse, the maiden flight of the type was performed.McGowen 2005, p. 105.McClellan 1989, p. 46.

The MD 500 series features shock-absorbing landing skid struts, a turboshaft engine mounted at a 45-degree angle toward the rear of the cabin pod, a fuel tank cell under the floor and the battery in the nose.{{cite web |url = https://www.mdhelicopters.com/md-500e.html |title = MD 500E |publisher = MD Helicopters |access-date = 2 November 2022}} The engine exhaust port is located at the end of the cabin pod underneath the tailboom. It has a short-diameter main rotor system and a short tail, which gives it an agile control response and also makes it less susceptible to weather-cocking.{{Citation needed|date=November 2022}} It had a distinctive atypical teardrop-shaped fuselage, a feature that sometimes led to personnel referring to it as the "flying egg".McClellan 1989, p. 44.

Hughes had allegedly succeeded in the LOH contest with its OH-6 helicopter by submitting a very low and aggressive price per airframe (without an engine), to the point where the company allegedly lost money .Cefaratt 2002, p. 77.Real, Jack. "The Real Story." Vertiflite, Fall/Winter 1999, pp. 36–39. Due to price escalations for both the OH-6 and spare components, the U.S. Army opted to reopen bids for the programme in 1967.McGowen 2005, p. 112. Seeking to profitably produce the type, Hughes offered the machine at a more realistic unit price of $56,550, however, this bid was undercut by the redesigned Bell OH-58 Kiowa, a militarised version of the JetRanger series. Despite this, some OH-6 helicopters were still ordered by the U.S. Army, though at a much reduced number.

=Hughes/MD 500=

Even prior to the first flight of the OH-6, Hughes had announced that it was working on a civilian version of the rotorcraft, which would be marketed as the Hughes 500. It was available in basic five- and seven-seat configurations. A utility version with a more powerful engine was offered as the 500U (later called the 500C).

During 1976, the improved Hughes 500D became the primary model. It was outfitted with a more powerful engine, a T-tail, and a new five-blade main rotor; furthermore, a four-blade tail rotor could be optionally installed.McClellan 1989, pp. 46, 50. The 500D was replaced by the 500E from 1982 with a pointed nose and various interior improvements, such as greater head- and legroom.McClellan 1989, pp. 46-47. The 530F was a more powerful version of the 500E optimized for hot and high work, being furnished with an enlarged main rotor and more powerful Allison 250-C30 engine, capable of producing up to 425 hp.McClellan 1989, p. 47.

During January 1984, Hughes Helicopters, the original manufacturer of the 500 series, was acquired by the American aircraft manufacturer McDonnell Douglas. Accordingly, starting in August 1985, the 500E and 530F were rebranded as the MD 500E and MD 530F Lifter respectively. Following the merger between Boeing and McDonnell Douglas, the division was briefly owned by the new entity; Boeing opted to quickly sell the former MD civil helicopter lines to the newly created MD Helicopters in early 1999.{{cite magazine |url = https://books.google.com/books?id=QQMH0Ovl2ucC&pg=PA32 |title = Bell buys Boeing's MD Singles |date = May 1998 |volume = 125 |number = 5 |issn = 0015-4806 |page = 32 |magazine=Flying}}Frawley 2003, p. 155.{{cite web |url = http://www.boeing.com/ids/news/1999/news_release_990219o.htm |title = Boeing Completes Sale Of Light Helicopter Product Lines To RDM |publisher = Boeing |archive-url = https://web.archive.org/web/20071228222449/http://www.boeing.com/ids/news/1999/news_release_990219o.htm |archive-date = 28 December 2007 |date = 19 February 1999}}{{cite web |url = http://www.boeing.com/news/releases/1999/news_release_990119n.htm |title = Boeing Announces Sale of its Light Helicopter Product Lines |publisher = Boeing |access-date = 7 February 2008 |url-status = dead |archive-url = https://web.archive.org/web/20080213053202/http://www.boeing.com/news/releases/1999/news_release_990119n.htm |archive-date = 13 February 2008 }} Military variants are marketed under the MD 500 Defender name.

=MD 520N=

File:md500n.g-smac.arp.jpg

The MD 520N introduced a revolutionary advance in helicopter design, dispensing with a conventional anti-torque tail rotor in favor of the Hughes/McDonnell-Douglas-developed NOTAR system. Exhaust from a fan is directed through slots in the tailboom, using the Coandă effect to counteract the torque of the main rotor, and a controllable thruster at the end of the tailboom is used for yaw control. Because the fan is enclosed in the tailboom, tail rotor noise—the major source of noise from most conventional helicopters—was significantly reduced.McClellan 1989, p. 52. It also eliminated the vulnerable exposed tail rotor blades, eliminating the possibility of persons being injured or killed on the ground and the cause for many confined area manoeuvring accidents.{{Citation needed|date=November 2022}}

McDonnell Douglas originally intended to develop the standard MD 520N alongside the more powerful hot-and-high optimized MD 530N; both were launched in January 1989 and were based on the conventional MD 500E. The MD 530N was the first to fly, on December 29, 1989, and the MD 520N first flew on May 1, 1990. Development of the MD 530N was suspended when McDonnell Douglas decided that the MD 520N met most customer requirements for the 530N. Certification for the MD 520N was awarded on September 13, 1991, and the first was delivered on December 31 that year.{{Citation needed|date=November 2022}}

In 2000, MD Helicopters announced enhancements to the MD 520N, including an improved Rolls-Royce 250-C20R+ engine with 3% to 5% more power for better performance on warm days, and changes to the diffuser and fan rigging, also increased range.{{Citation needed|date=November 2022}}

Operational history

=Civilian=

The MD 500 series had proven to be popular with civilian operators, with which the type has seen use for a diverse range of purposes. According to Flying magazine, it has been particularly popular in circumstances where the primary passenger and pilot are both in the front seats, as can be typical in aerial observation, utility, and law enforcement work.McClellan 1989, pp. 47-48. While a minority have been used for executive transportation (typically modified to provide rear seating), it is more common to see it used as a private/personal helicopter.McClellan 1989, p. 48.

While numerous operators have opted to procure MD 500s with the newer Rolls-Royce 250-C20 engine, which provides greater reliability and power output than older counterparts, some operators have reportedly chosen to remove these engines and substitute them with Vietnam-era surplus engines which are available even into the twenty-first century at a considerably lower purchase cost.{{cite web |url = https://www.ainonline.com/aviation-news/general-aviation/2022-11-01/hansen-helicopters-highway-hell |title = Hansen Helicopters' 'Highway to Hell' |publisher = AIN Online |date = 1 November 2022 |first = Mark |last = Huber}}

=El Salvador=

At the start of the Salvadoran Civil War, the Salvadoran Air Force operated a total of six MD 500D helicopters purchased from civilian sources. Amid the conflict, these were supplemented by a further nine MD 500Es that were supplied by the United States in 1984. The type was typically operated in the gunship role, having been armed with both XM27 7.62 mm Minigun subsystems and unguided 70mm rocket pods; additional mission roles included aerial reconnaissance and liaison duties. By the end of the conflict, only two MD 500D and seven MD 500Es were reportedly in an operational condition.

By 2012 Salvadoran Air Force received three brand new MD 500Es from MD Helicopters to be used for the United Nations mission in Mali, Africa. In 2022 the United States donated four MD 530Fs which were previously owned by the Department Of State Air Wing (DOSAW) which will also be used for United Nations missions. The Salvadoran Air Force as of 2023 currently operates six MD 500Es and four MD 530Fs.

=North Korea=

During the 1980s, North Korea managed to circumvent US export restrictions and covertly purchase a total of 87 civilian-type Hughes MD 500s through a legitimate West German export firm before the US government learned of the illegal action by North Korea and acted to prevent any further deliveries to the country. Once they had arrived in North Korea, efforts continued to be made to conceal their existence, and are believed to have been flown only sparingly at least for a large portion of their service life. There have been allegations that at least sixty of the helicopters delivered to North Korea have been modified to serve as helicopter gunships. As South Korea produces the MD 500 domestically (under license) for use by its own armed forces, the modified helicopters operated by North Korea were deemed useful in conducting covert or deceptive operations against South Korea (such as incursions past the border).{{cite web |first = David |last = Cenciotti |url = http://www.businessinsider.com/north-koreas-illegal-helicopters-emerge-2013-7 |title = North Korea's Illegal Helicopters Emerge |publisher = Businessinsider.com |date = 31 July 2013 |access-date = 3 December 2021}}

The modified MD 500 helicopters were finally revealed by North Korea in an obviously visible manner, even to international observers, during the country’s annual Victory Parade held in Pyongyang on 27 July 2013, which commemorated the 60th anniversary of the end of the Korean War in 1953. According to analysts, it is visible that the North Korea's fleet of MD 500s have been modified significantly so that they can function as light attack helicopters. Amongst these changes was mounting points and interfacing apparatus to allow them to fire Soviet-designed AT-3 Sagger anti-tank wire-guided missiles.{{cite web |url = http://theaviationist.com/2013/07/30/dprk-h500e/ |title = North Korea's (illegally supplied) armed Hughes 500E helicopters emerge after 30 years in the dark |publisher = The Aviationist |date = 30 July 2013}}

Variants

;369

:Military prototype designated YOH-6A.

;369A

:Military production designated OH-6.

;MD 500C (369H)

:Improved five-seat commercial variant powered by an Allison 250-C18B rated at 317 shp (236 kW); certified in 1966.

;Kawasaki-Hughes 369HS

:Built under license by Kawasaki Heavy Industries in Japan alongside OH-6J.

;MD 500M Defender (369HM)

:Military export version as the MD 500 Defender; certified in 1968.

;MD 500C (369HS)

:Improved four-seat commercial variant by an Allison 250-C20 rated at 400 shp (298 kW); certified in 1969.

;MD 500C (369HE)

:A 369HS with higher standard interior fittings, certified in 1969.

;{{visible anchor|MD 500D (369D)}}

:New commercial version from 1976 powered by an Allison 250-C20B rated at 420 shp (313 kW); certified in 1976.

;MD 500E (369E)

:Executive version of the 500D with recontoured nose; certified in 1982.

;NH-500E

:Italian-built version of the 500E. License-produced by Breda Nardi before merging with Agusta.

;MD 520N

:NOTAR (NO TAil Rotor) version of the 500E, certified in 1991. Powered by Rolls-Royce (formerly Allison) 250-C20R/2 rated at 450 shp.

;MD 530F (369F)

:Hot and high version of the 500E powered by a Rolls-Royce (formerly Allison) 250-C30HU rated at 650 shp (485 kW), certified in 1984.

;Unmanned Little Bird Demonstrator and AH-6

:A civilian 530F modified by Boeing Rotorcraft Systems to develop UAV technologies for both civilian and military applications.{{cite press release |url = http://www.boeing.com/news/releases/2006/q4/061009b_nr.html |title = Boeing Manned/Unmanned Light Helicopter Makes First Flight |date = 9 October 2006 |publisher = Boeing |access-date = 29 April 2013 |url-status = dead |archive-url = https://web.archive.org/web/20121014034455/http://www.boeing.com/news/releases/2006/q4/061009b_nr.html |archive-date = 14 October 2012}}

=Military=

:For military variants, see McDonnell Douglas MD 500 Defender and Hughes OH-6 Cayuse.

Operators

File:Kcsd-md500-N197E-040621-02-16.jpg Sheriff's MD 500E]]

File:NH-500 Guardia di Finanza helicopter.jpg NH-500 helicopter in flight.]]

The MD 500 is widely operated by private individuals, companies and law enforcement agencies around the world.

; {{BEL}}

Federal Police{{cite web |url = http://www.belgian-wings.be/webpages/navigator/Photos/MilltaryPics/post_ww2/McDonnell%20Douglas%20MD520N/md520n.htm |title = McDonnell Douglas MD520N |website = www.belgian-wings.be |url-status = dead |archive-url = https://web.archive.org/web/20110202150835/http://www.belgian-wings.be/Webpages/Navigator/Photos/MilltaryPics/post_ww2/McDonnell%20Douglas%20MD520N/md520n.htm |archive-date = 2 February 2011}}

;{{COL}}

National Police of ColombiaRivas 2015, p. 121.

;{{CRC}}

Air Vigilance Service{{cite web |url = http://www.au.af.mil/au/afri/aspj/airchronicles/apj/apj07/fal07/overall.html |archive-url = https://web.archive.org/web/20151025074334/http://www.au.af.mil/au/afri/aspj/airchronicles/apj/apj07/fal07/overall.html |url-status = dead |archive-date = October 25, 2015 |title = Overlook of the SVA |publisher = au.af.mil |access-date = 19 May 2017}}

;{{ECU}}

National Police of Ecuador{{cite web |url = http://www.eltiempo.com.ec/noticias-cuenca/31178-la-polica-a-del-azuay-recibe-hoy-helica-ptero/ |title = El Tiempo: La Policía del Azuay recibe hoy helicóptero |website = eltiempo.com.ec |archive-url = https://web.archive.org/web/20161018213131/http://www.eltiempo.com.ec/noticias-cuenca/31178-la-polica-a-del-azuay-recibe-hoy-helica-ptero/ |archive-date = 18 October 2016 |language = Spanish}}

;{{FIN}}

Utti Jaeger Regiment{{cite web |url = http://maavoimat.fi/utin-jaakarirykmentti/tietoa-meista |title = Finnish Defence Forces |website = maavoimat.fi |language = Finnish}}

;{{HON}}

Honduran Air Force{{cite web |author = Erich |url = http://www.aeroflight.co.uk/user/fleet/honduras-af-hughes-500-369d.htm |title = Hughes 500 (369D) – Aeroflight |publisher = Aeroflight.co.uk |date = 5 October 2014 |access-date = 3 December 2021}}

;{{HUN}}

Hungarian Police{{cite web |url = http://iho.hu/hir/amerikai-helikopterek-magyarorszagon |title = Amerikai helikopterek Magyarországon ("American helicopters in Hungary") |website = iho.hu |language = Hungarian}}

;{{IDN}}

Pelita Air
Indonesian Air Force - 12 ex-Pelita Air Hughes 500C were given to the Air Force in 1982. Retired from service.{{cite web |date = 31 May 2016 |title = Hughes 500C TNI AU: Sempat Jadi Helikopter Latih Lanjut, Cikal Bakal Heli Serbu Ringan MD530G |url = https://www.indomiliter.com/hughes-500c-tni-au-sempat-jadi-helikopter-latih-lanjut-cikal-bakal-heli-serbu-ringan-md530g/ |access-date = 11 December 2020 |website = indomiliter.com}}{{cite web |url = https://tni-au.mil.id/skadron-udara-7/ |title = Skadron Udara 7 |website = tni-au.mil.id |date = 16 January 2010 |access-date = 11 December 2020 |archive-date = 11 December 2020 |archive-url = https://web.archive.org/web/20201211023244/https://tni-au.mil.id/skadron-udara-7/ |url-status = live}}

;{{IRQ}}

{{Flag|Iraqi Kurdistan}}
Kurdistan Region Police{{Cite web |title=Kurdistan government orders 12 MD 530F helicopters |url=https://www.helicopterinvestor.com/news/54623/kurdistan-orders-md-530f-helicopters-108/ |access-date=2023-11-07 |website=Helicopter Investor |language=en-US}}

;{{ITA}}

Guardia di Finanza
State Forestry Corps{{cite magazine |last = Roelofs |first = Erik |title = Italy's Flying Foresters |magazine = Air International |date = April 2012 |volume = 82 |issue = 4 |pages = 78–81 |issn = 0306-5634}}

;{{PHI}}

Philippine Air Force - 1 unit MD-500E trainer, transferred from Department of Public Works and Highways.{{cite news |last = |first = |url= https://www.flightglobal.com/download?ac=90688|title = World Air Forces 2023|newspaper = Flight Global|publisher= Flightglobal Insight |year= 2022 |doi = |access-date= 12 January 2023}}

;{{KEN}}

Kenya Army{{cite web |last1=Kenyatte |first1=Patrick |title=Kenya Defence Forces induct MD 530F helicopters |url=https://www.military.africa/2020/01/kenya-defence-forces-induct-md-530f-helicopters/ |website=Military Africa |date=25 January 2020 |access-date=22 January 2024}}

;{{PRK}}

Korean People's Air Force{{cite web |url = http://www.flightglobal.com/airspace/media/reports_pdf/emptys/101015/world-air-forces-2013.pdf |title = World Air Forces 2013 |publisher = Flightglobal Insight |date = 2012 |access-date = 28 February 2013|archive-url=http://web.archive.org/web/20121216005935/http://www.flightglobal.com/airspace/media/reports_pdf/emptys/101015/world-air-forces-2013.pdf|archive-date=16 December 2012}} - Total 87 were smuggled into North Korea in contravention of international sanctions.

;{{Flagu|United States}}

Academi{{cite web |url = http://defense.aol.com/2012/06/08/academi-ex-blackwater-boosts-state-dept-business-eyes-acq/ |title = ACADEMI -- ex-Blackwater -- Boosts State Dept Business, Eyes Acquisitions |publisher = defense.aol.com |access-date = 28 February 2013 |url-status = dead |archive-url = https://web.archive.org/web/20130412035341/http://defense.aol.com/2012/06/08/academi-ex-blackwater-boosts-state-dept-business-eyes-acq |archive-date = 12 April 2013}}
Cleetus McFarland{{cite web |url = https://www.youtube.com/watch?v=TmIb0nM5uts&t=2s |title=I Bought An Abandoned Helicopter From South America... |website=YouTube|date=11 March 2024 }}
Columbus Division of Police{{cite web |url = http://www.columbuspolice.org/AboutCPD/Highlights/highlights.html |title = Columbus Police Helicopter Unit |publisher = columbuspolice.org |access-date = 31 May 2016 |archive-url = https://web.archive.org/web/20160601152255/http://www.columbuspolice.org/AboutCPD/Highlights/highlights.html |archive-date = 1 June 2016 |url-status = dead }}
Fresno County Sheriff's Department{{Cite news |url = http://kmph.com/news/local/fresno-county-sheriffs-office-receives-new-helicopter |title = Fresno County Sheriff's Office receives new helicopter |website = kmph.com |access-date = 26 February 2018 |language = en-US}}
Glendale Police Department{{cite web |url = http://www.ci.glendale.ca.us/police/PDFs/newsletters/GPD_Newsletter_Winter2010.pdf |title = Glendale Police Newsletter |publisher = ci.glendale.ca.us |access-date = 16 October 2013 |archive-date = 16 October 2013 |archive-url = https://web.archive.org/web/20131016125050/http://www.ci.glendale.ca.us/police/PDFs/newsletters/GPD_Newsletter_Winter2010.pdf |url-status = dead }}
Hawaii County Fire Department{{cite web |url = http://helihub.com/2010/07/29/hawaii-county-fire-dept-replaces-500d-with-new-500e/ |title = Hawaii County Fire Dept replaces 500D with new 500E |date = 29 July 2010 |publisher = helihub.com |access-date = 28 February 2013}}
Houston Police Department{{cite web |url = http://helihub.com/2010/11/18/houston-police-dept-celebrates-40-years-of-air-support/ |title = Houston Police Dept celebrates 40 years of air support |date = 18 November 2010 |publisher = helihub.com |access-date = 28 February 2013}}
Kansas City Police Department{{cite web |url = http://helihub.com/2012/02/20/kansas-city-police-orders-three-new-md500es/ |title = Kansas City Police orders three new MD500Es |publisher = HeliHub.com |date = 20 February 2012 |access-date = 3 December 2021}}
Las Vegas Metropolitan Police Department{{cite web |url = http://www.helis.com/database/news/md530_lvmpd/ |title = MD Helicopters Delivers New MD 530F to Las Vegas Metro Police Department |website = helis.com |access-date = 28 February 2013}}
Metro Nashville Police Department{{Cite web |title=Police Department Aviation Unit {{!}} Nashville.gov |url=https://www.nashville.gov/departments/police/support-services/special-operations/tactical-operations/aviation |access-date=2023-12-12 |website=www.nashville.gov |language=en}}
Pasadena Police Department{{cite web |url = http://helihub.com/2010/03/22/pasadena-police-hold-public-launch-of-new-500e/ |title = Pasadena Police hold public launch of new 500E |date = 22 March 2010 |publisher = helihub.com |access-date = 28 February 2013}}
Prince George's County Police Department - Has operated the MD520N since at least June 2000,{{Cite web|archive-url=http://web.archive.org/web/20050129203337/http://www.aeroboek.nl/520/LN-091.HTM|archive-date=29 January 2005|url=http://www.aeroboek.nl/520/LN-091.HTM|title=MD 520 NOTAR msn: LN-091}} equipped with FLIR, with a third one added in 2017 for a total of 4.{{cite web |url = https://www.mdhelicopters.com/prince-george%E2%80%99s-county-police-department-to-expand-aviation-section-with-new-md-520n.html |title = Prince George's County Police Department to Expand Aviation Section with new MD 520N - MD Helicopters |website = www.mdhelicopters.com |archive-url=http://web.archive.org/web/20170709133140/https://www.mdhelicopters.com/prince-george%E2%80%99s-county-police-department-to-expand-aviation-section-with-new-md-520n.html|archive-date = 9 July 2017}}
Riverside Police Department{{cite web |url = http://www.riversideca.gov/rpd/aviation/Aviation.htm |title=Aviation Division |access-date = 28 February 2011 |archive-url = https://web.archive.org/web/20110721061715/http://www.riversideca.gov/rpd/aviation/Aviation.htm |archive-date = 21 July 2011 |url-status = dead }}
San Diego County Sheriff's Office{{cite web |url = http://www.sdsheriff.net/astrea/aircraft.html |title = ASTREA - Aerial Support to Regional Enforcement Agencies |publisher = sdsheriff.net |access-date = 28 February 2013 |archive-date = 18 October 2016 |archive-url = https://web.archive.org/web/20161018234750/http://www.sdsheriff.net/astrea/aircraft.html |url-status = dead }}
St. Louis Metropolitan Police Department{{cite web |url = http://www.slmpd.org/ |title = Official Website of the Metropolitan Police Department, City of St. Louis |website = www.slmpd.org |access-date = 6 July 2017}}
St. Louis County Police Department{{cite web |url = http://www.stlouisco.com/LawandPublicSafety/PoliceDepartment |title = Police Department {{!}} Law & Public Safety |publisher = St. Louis County |website = www.stlouisco.com |language = en-US |access-date = 7 July 2017}}
Oakland Police Department{{cite web |url = https://twitter.com/oaklandpoliceca/status/1393750751084613634 |title = Oakland Police Helicopter ARGUS is assisting patrol officers on our city streets. This is one of many enforcement actions OPD is taking to deter and enforce illegal Sideshow activity |website = Twitter |access-date = 15 May 2021 }}

Specifications

=MD 530F=

File:McDonnell Douglas MD 500E orthographical image.svg

{{Aircraft specs

|ref=MD500E Performance Specifications,{{cite web |url = http://www.mdhelicopters.com/helicopters/pdf/500E/performance_specifications.pdf |title = MD500E Performance Specifications |url-status = dead |archive-url = https://web.archive.org/web/20120122063745/http://www.mdhelicopters.com/helicopters/pdf/500E/performance_specifications.pdf |archive-date = 22 January 2012 }} The International Directory of Civil Aircraft

|prime units?=kts

|crew= 2

|capacity= 3 passengers

|length ft= 32

|length in= 7

|length note=

|width ft=

|width in=

|width note=

|height ft= 8

|height in= 9

|height note=

|empty weight lb= 1,591

|empty weight note=

|gross weight lb=

|gross weight note=

|max takeoff weight lb= 3,550

|max takeoff weight note=

|fuel capacity=

|more general=

|eng1 number= 1

|eng1 name= Allison 250-C30

|eng1 type= turboshaft engine

|eng1 shp= 650

|eng1 note=

|rot number= 1

|rot dia ft= 27

|rot dia in= 4

|rot area sqft= 587.5

|rot area note=

Blade section: - NACA 0012{{cite web |last1 = Lednicer |first1 = David |title = The Incomplete Guide to Airfoil Usage |url = https://m-selig.ae.illinois.edu/ads/aircraft.html |website = m-selig.ae.illinois.edu |access-date = 16 April 2019}}

|max speed kts= 152

|max speed note=

|cruise speed kts= 135

|cruise speed note=

|never exceed speed kts=

|never exceed speed note=

|range nmi= 223

|range note=

|combat range nmi=

|combat range note=

|ferry range nmi=

|ferry range note=

|endurance=

|ceiling ft= 18,700

|ceiling note=

|climb rate ftmin= 2,070

|climb rate note=

|time to altitude=

|disk loading lb/sqft=

|disk loading note=

|fuel consumption lb/mi=

|power/mass=

|more performance=

|avionics=

}}

=MD 500C=

File:Hughes OH-6 orthographical image.svg

{{Aircraft specs

|ref={{cite book |title = Jane's All the World's Aircraft 1971-72 |year = 1971 |publisher = Sampson Low, Marston & Company |location = London |isbn = 9780354000949 |editor1-last = Taylor |editor1-first = John W.R. |edition = 62nd |pages = 322–323}}

|prime units?= kts

|crew= 2

|capacity= 2

|length ft= 30

|length in= 3.75

|length note=

|width ft=

|width in=

|width note=

|height ft= 8

|height in= 1.5

|height note=

|empty weight lb= 1,229

|empty weight note=

|gross weight lb=

|gross weight note= 2,400

|max takeoff weight lb= 2,700

|max takeoff weight note=

|fuel capacity= {{cvt|61.5|USgal|impgal l|0}} in two 50% self-sealing bladder tanks under rear cabin floor

|more general=

|eng1 number= 1

|eng1 name= Allison T63-A-5A

|eng1 type= turboshaft engine

|eng1 shp= 317

|eng1 note=

|rot number= 1

|rot dia ft= 26

|rot dia in= 4

|rot area sqft= 544.63

|rot area note=

Blade section: - NACA 0012{{cite web |last1 = Lednicer |first1 = David |title = The Incomplete Guide to Airfoil Usage |url = https://m-selig.ae.illinois.edu/ads/aircraft.html |website = m-selig.ae.illinois.edu |access-date = 16 April 2019}}

|max speed kts= 130

|max speed note=

|cruise speed kts= 130

|cruise speed note=

|never exceed speed kts=

|never exceed speed note=

|range nmi= 330

|range note= at {{cvt|5000|ft|0}}

|combat range nmi=

|combat range note=

|ferry range nmi= 1,354

|ferry range note= with {{cvt|1300|lb|0}} of fuel