Westland Sea King: Wikis


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WS-61 Sea King
Royal Air Force Westland Sea King HAR3A search and rescue variant
Role Medium-lift transport/utility helicopter
Manufacturer Westland Helicopters
First flight 1969
Status Active service
Primary users Royal Navy
Royal Air Force
Royal Australian Navy
Indian Navy
Number built 344
Developed from SH-3 Sea King

The Westland WS-61 Sea King is a British license-built version of the American Sikorsky S-61 helicopter of the same name, built by Westland Helicopters. The aircraft differs considerably from the American version, with Rolls-Royce Gnome engines, British made anti-submarine warfare systems and a fully computerised control system. The Westland Sea King was also produced as the Commando troop transport version for export.


Design and development

Westland Helicopters, which had a long standing licence agreement with Sikorsky to allow it to build Sikorsky's helicopters, extended the agreement to cover Sikorsky Sea King soon after the Sea King's first flight in 1959.[1] In 1966 the British Royal Navy selected the Sea King to meet a requirement for an anti-submarine warfare helicopter to replace the Westland Wessex, placing an order with Westlands for 60 Sea Kings on 27 June 1966.[2] The prototype and pre-production aircraft were constructed with Sikorsky-built components. The first Westland-built aircraft, the first production aircraft for the Royal Navy designated the Sea King HAS1, first flew on the 7 May 1969 and was delivered to the navy in the same year.

The last Sea Kings to be built at Westland were tailnumbers 329 and 330. They were Mk 43B SAR Versions for the RNoAF Royal Norwegian Air Force. The last of the Royal Navy's Sea King ASW helicopters was retired in 2003, being replaced by the AgustaWestland Merlin HM1. The Airborne Surveillance and Area Control (ASaC) or Airborne Early Warning (AEW) variant is expected to be replaced in time for the two Queen Elizabeth-class aircraft carriers, some time in the next decade. The types in contention are a Merlin derivative, a V-22 Osprey variant or a derivative of the E-2C Hawkeye. The HC4 commando variant is also expected to be replaced within the next decade along with Search and Rescue variants. 330 were produced in total.


Anti-submarine warfare

The basic ASW Sea King has been upgraded numerous times, becoming the HAS2, HAS5 and HAS6, the latter of which has been replaced by the AgustaWestland Merlin ASW helicopter. Surviving aircraft are having the mission equipment removed and the aircraft are being used in the utility role.

Troop transport

A troop carrying version marketed as the Commando was developed for the Egyptian Air Force. A Commando variant, but retaining the folding blades and tail of the ASW variants, was designated the Sea King HC4 by the Royal Navy and is still in service as an important asset for amphibious assaults. It is capable of transporting 27 fully equipped troops with a range of 400 miles (640 km). They have been supplemented by removing the ASW equipment from some of the HAS.6 fleet and re-purposing them as Royal Marine troop transports.

Search and rescue

A dedicated Search and Rescue version (Sea King HAR3) was developed for the Royal Air Force, and the first of 15 entered service from September 1977 to replace the Westland Whirlwind HAR10. A sixteenth aircraft was ordered shortly after, and following the Falklands War of 1982, three more aircraft were purchased to enable operation of a Search and Rescue Flight in the islands, initially from Navy Point on the north side of Stanley harbour, and later from the RAF airfield at Mount Pleasant. In 1992 six further aircraft were ordered to replace the last remaining Westland Wessex helicopters in the Search and Rescue role. The six (Sea King HAR3A) had updated systems including, uniquely amongst all the marks of Sea King in UK service, a digital autopilot with coupled navigation system. Search and rescue versions of the Sea King were produced for the Royal Norwegian Air Force, and the German Navy, and later for the Belgian Air Force. The Royal Air Force aircraft are in service with 22, 202, 203(R) and formerly with 78 Squadrons. The latter is now a Merlin HC3A unit at RAF Benson. The Falklands unit has reverted to 1564 Flight.

Some Royal Navy HAS5 ASW variants were adapted for Search and Rescue with 771 Naval Air Squadron, also being used by the HMS Gannet SAR Flight at Prestwick Airport in Scotland. They are expected to remain in service until 2018.[3]

Airborne surveillance and area control

The latest variant of the Sea King is the ASaC 7, formerly known as Airborne Early Warning (AEW). The Royal Navy AEW capability had been lost when the Fairey Gannet aeroplane was withdrawn after the last of the RN's fleet carriers, HMS Ark Royal, was decommissioned in 1978. During the Falklands War a number of warships were lost, with casualties, due to the lack of an indigenous AEW presence - the RAF Shackleton AEW.2 proposed fleet cover was too unresponsive and at too great a distance to be practical. Two HAS2 Sea Kings were modified in 1982. They were both flying within 11-weeks as the AEW2A and deployed with 824 'D' Flight on HMS Illustrious and served in the Falklands after the cessession of hostilities. Later versions of this Sea King variant came into operational service in 1985, being deployed by 849 Naval Air Squadron. Thirteen Sea Kings were eventually modified. The main modification is the addition of the Thales Searchwater radar which is attached to the side of the fuselage on a swivel arm and protected by an inflatable dome. This allows the helicopter to lower the radar below the fuselage in flight and to raise it for landing. The aircraft were further modified and designated AEW7 with the removal of redundant equipment most noticeably the ASW radome above the rear fuselage.

The latest ASaC Sea King is the ASaC7, which is deployed on the Royal Navy's Invincible class aircraft carriers. The ASaC7 is a further upgrade of the AEW7. The main role of the ASaC Sea King is detection of low flying attack aircraft. It also provides interception/attack control and over-the-horizon targeting for surface launched weapon systems. In comparison to older versions, the new radar enables the ASaC7 to simultaneously track 400 targets instead of the earlier 250 targets.

The ASaC7s will remain in-service until they are replaced under the Future Organic Airborne Early Warning (FOAEW) programme, which will operate from the UK's future carrier, CVF.

Operational history

Falklands War

Royal Navy SAR Sea King

The Sea King was deployed during the Falklands War, performing mainly anti-submarine search and attack, and also replenishment, troop transport, and Special Forces insertions into the occupied islands. On 23 April 1982, a Sea King HC4 was ditched while performing a risky transfer of supplies to a ship at night, while operating from the flagship HMS Hermes.

Another Sea King was lost, again from ditching into the sea, due to a systems malfunction. All of the Sea King's crew were rescued. Five days later another Sea King, again from Hermes, crashed into the sea due to an altimeter problem; all crew were rescued.

Sea King of the German Navy

One of the most mysterious events of the war occurred on 17 May, when a Sea King HC Mk4 landed at Punta Arenas, Chile and was subsequently destroyed by its crew. The three crew later gave themselves up to Chilean authorities. They were returned to the UK and were given gallantry awards for the numerous dangerous missions that they had undertaken. The official story was that the crew had become lost, although it was widely speculated that the helicopter had actually been inserting Special Air Service (SAS) soldiers onto the Argentine mainland.The operation name was Operation Mikado [4]

On 19 May, a Sea King had been transporting SAS troops to HMS Intrepid from Hermes and was attempting to land on Intrepid. A thump was heard, and the Sea King dipped and crashed into the sea, killing 22 men. However, nine survived this accident, but only after jumping out of the Sea King just before the helicopter crashed. Bird feathers were found in the debris of the crash, which appeared to suggest that this accident was the result of a bird strike, though this theory is debated. The SAS lost 18 men in that crash, their highest number of casualties on one day since World War II. The Royal Signals lost one man and the RAF one man. The latter was the only RAF fatality of the campaign.

Gulf War I

The Sea Kings during the 1991 Gulf War had a limited role, compared to their wide ranging task during the Falklands War. Its roles included air-sea rescue, inter-ship transporting duties and transporting Royal Marines onto any suspect ships that refused to turn around during the enforced embargo on Iraq. In addition 2 Sea King Mk5s from 826 Naval Air Squadron had their ASW SONAR equipment removed and were equipped with a system for hunting sea mines called 'Demon Camera'.


The Sea King participated in the UN's intervention in Bosnia, with Sea Kings operated by 820 Naval Air Squadron and 845 Naval Air Squadron. The Sea Kings from 820 NAS were deployed from Royal Fleet Auxiliary ships Fort Grange (since renamed Fort Rosalie) and Olwen. They provided logistical support, rather than the ASW role that the Squadron was geared towards, ferrying troops as well as supplies across the Adriatic Sea. They performed over 1,400 deck landings, flying in excess of 1,900 hours. The Sea Kings from 845 NAS performed vital casualty evacuation and other tasks. Their aircraft were hit numerous times, though no casualties were incurred.

During NATO's intervention in Kosovo, a British led operation, Sea Kings from 814 Naval Air Squadron, operated aboard HMS Ocean and RFA Argus and also on destroyers and frigates. They provided search and rescue (SAR), as well as transporting troops and supplies.

Gulf War II

A Sea King in service with the Royal Norwegian Air Force

During the 2003 invasion of Iraq, Sea King ASaC Mk7 from 849 NAS operated off the flagship of the Royal Navy Task Force HMS Ark Royal. Sea King HC Mk4s also deployed from HMS Ocean (operated by 845 Naval Air Squadron) landing the lead invasion forces on the Al-Faw Peninsula, as well as Sea King HAS Mk6 from RFA Argus (operated by 820 Naval Air Squadron).

On 22 March 2003, two AEW Sea Kings from 849 NAS operating from Ark Royal collided over the Persian Gulf, killing six Britons and one American.

During the Gulf Wars the Sea Kings provided logistical support, transporting Royal Marines from their off-shore bases on Ark Royal, Ocean and other ships on to land in Kuwait.


In July 2006 Sea King HC.4 helicopters from RNAS Yeovilton were deployed to Cyprus to assist with the evacuation of British citizens from Lebanon.The UK mission was codenamed Operation Highbrow.


Several RAN Sea Kings embarked aboard HMAS Melbourne prepare to launch

The Sea King replaced the Westland Wessex HAS31 as the Royal Australian Navy's Anti-Submarine Warfare helicopter from 1974. The aircraft were typically fitted with Racal ARI 5955/2 lightweight radar, Racal Navigation System RNS252, Racal Doppler 91, ADF Bendix/King KDF 806A and Tacan AN/ARN 118. All surviving Mk50 airframes were upgraded to Mk50A standard, through a mid-life extension. In 1995, the AQS-13B sonar was removed and since then, the Sea King's main role changed to maritime utility support. During the first five years of operation, a number of aircraft were lost due primarily to a loss of main gearbox oil.

The Fleet Air Arm's Sea King fleet will be replaced earlier than was originally planned in response to the loss of a Sea King providing humanitarian aid in Indonesia in April 2005 due to mechanical failure. The crash resulted in the deaths of nine Australian military personnel. Australian Sea Kings played an integral part in the relief effort for the December 2004 Indian Ocean Tsunami, particularly in Indonesia's Aceh province where they delivered medical teams and aid supplies from Royal Australian Navy ships. The Australian Sea Kings will be replaced by the MRH 90.


Indian Navy Sea King Mk.42B on INS Mumbai at Portsmouth, UK
Royal Navy Sea King AEW in 1998
Sea King HAS.6 on HMS Invincible in 2004
RAN Sea King Mk50, Shark 09, launches from HMAS Melbourne, 1980
Sea King HAS.1
The first anti-submarine version for the Royal Navy. The Westland Sea King first flew in 1969.
Sea King HAS.2
Upgraded anti-submarine version for the Royal Navy. Some were later converted for AEW (Airborne Early Warning) duties.
Sea King AEW.2A
Originally two Sea King HAC.2s helicopters were later converted into AEW aircraft, after shortcomings in that role were revealed with tragic consequences during the 1982 Falklands War.
Sea King HAR.3
Search and rescue version for the Royal Air Force.
Sea King HAR.3A
Upgraded search and rescue version of the Sea King HAR.Mk 3 for the Royal Air Force.
Sea King HC.4
Commando assault, utility transport version for the Royal Navy and is still in service with 845, 846 and 848 squadrons based at RNAS Yeovilton. The Sea King HC.Mk 4 is capable of transporting 28 fully equipped troops. (Also referred to as Westland Commando).
Sea King Mk.4X
Two helicopters for trials at the Royal Aircraft Establishment at Farnborough.
Sea King HAS.5
Upgraded anti-submarine warfare version for the Royal Navy, some later converted into the HAR.5 for Search and Rescue.
Sea King HAR.5
Search and rescue version for the Royal Navy.
Sea King AEW.5
Three Sea King HAS5s were converted into AEW helicopters for the Royal Navy.
Sea King HU.5
Surplus HAS5 ASW helicopters converted into utility role for the Royal Navy.
Sea King HAS.6
Upgraded Anti-submarine warfare version for the Royal Navy.
Sea King HAS.6(CR)
Five surplus HAS6 ASW helicopters converted into the utility role for the Royal Navy. One phase 1 aircraft and four phase two aircraft all serving with 846 NAS.
Sea King ASaC.7
Upgraded AEW7 for the Royal Navy.
Sea King Mk.41
Search and rescue version of the Sea King HAS.Mk 1 for the German Navy, with longer cabin. 23 built, delivered between 1973 and 1975. 20 were upgraded from 1986 onwards with additional Ferranti Seaspray radar in nose and capability to carry four Sea Skua Anti-ship missiles.[5]
Sea King Mk.42
Anti-submarine warfare version of the Sea King HAS.Mk 1 for the Indian Navy. 12 built.[6]
Sea King Mk.42A
Anti-submarine warfare version of the Sea King HAS.Mk 2 for the Indian Navy, fitted with haul-down system for operating from small ships. 3 built.[7]
Sea King Mk.42B
Multi-purpose version for the Indian Navy, equipped for anti-submarine warfare, with dipping sonar and advanced avionics, and anti-shipping operations, with two Sea Eagle missiles. 21 built (one crashing before delivery).[7]
Sea King Mk.42C
Search and rescue/utility transport version for the Indian Navy with nose mounted Bendix serch radar. Six built.[7]
Sea King Mk.43
Search and rescue version of the Sea King HAS.Mk 1 for the Royal Norwegian Air Force, with lengthened cabin. 10 built.[8]
Sea King Mk.43A
Uprated version of the Sea King Mk.43 for the Royal Norwegian Air Force, with airframe of Mk2 but engines of Mk.1. Single example built.[8]
Sea King Mk.43B
Upgraded version of the Sea King Mk.43 for the Royal Norwegian Air Force. Upgraded avionics, including MEL Sea Searcher radar in large dorsal radome, weather radar in nose and FLIR turret under nose. Three new-build plus upgrade of remaining Mk.43 and Mk.43A helicopters.[8]
Sea King Mk.45
Anti-submarine and anti-ship warfare version of the Sea King HAS.Mk 1 for the Pakistan Navy. Provision for carrying Exocet anti-ship missile. Six built.[8]
Sea King Mk.45A
One ex-Royal Navy Sea King HAS Mk.5 helicopter was sold to Pakistan as part of a follow-on order.[9]
Sea King Mk.47
Anti-submarine version of the Sea King HAS.Mk 2 for the Egyptian Navy. Six built.[9]
Sea King Mk.48
Search and rescue version for the Belgian Air Force. Airframe similar to HAS Mk.2 but with extended cabin. Five built, delivered 1976.[10]
Sea King Mk.50
Multi-role version for the Royal Australian Navy, equivalent to (but preceding) HAS Mk.2. Ten built.[10]
Sea King Mk.50A
Two improved Sea Kings were sold to the Royal Australian Navy as part of a follow-on order in 1981.[11]
Sea King Mk.50B
Upgraded multi-role version for the Royal Australian Navy.
Commando Mk.1
Minimum change assault and utility transport version for the Egyptian Air Force, with lengthened cabin but retaining sponsons with floation gear.[11] Five built.[12]
Egyptian Westland Commando Mark 2
Commando Mk.2
Improved assault and utility transport version for the Egyptian Air Force, fitted with more powerful engines, non-folding rotors and omitting undercarriage sponsons and floatation gear. 17 built.[13]
Commando Mk.2A
Assault and utility transport version for the Qatar Emiri Air Force, almost identical to Egyptian Mk.2. Three built.[14]
Commando Mk.2B
VIP transport version of Commando Mk.2 for the Egyptian Air Force. Two built.[14]
Commando Mk.2C
VIP transport version of Commando Mk.2A for the Qatar Emiri Air Force. One built.[14]
Commando Mk.2E
Electronic warfare version for the Egyptian air force, fitted with integrated ESM and jamming system, with radomes on side of fuselage. Four built.[15]
Commando Mk.3
Anti-ship warfare version for the Qatar Emiri Air Force, fitted with dorsal radome and capable of carrying two Exocet missiles.[15]


Royal Australian Navy Sea Kings, Shark 07 and Shark 02
Belgian Air Component Sea King Mk48
German SAR Sea King
 United Kingdom

Specifications (Sea King HAS.5)

Data from Omnifarious Sea King [18]

General characteristics

  • Crew: Two to four, depending on the mission
  • Length: 55 ft 10 in[19] (17.02 m)
  • Rotor diameter: 62 ft 0 in (18.90 m)
  • Height: 16 ft 10 in (5.13 m)
  • Disc area: 3,020 ft² (280 m²)
  • Empty weight: 14,051 lb (6,387 kg)
  • Loaded weight: 21,000 lb (9,525 kg)
  • Max takeoff weight: 21,400 lb (9,707 kg) (overload weight)
  • Powerplant:Rolls-Royce Gnome H1400-2 turboshafts, 1,660 shp (1,238 kW) each
  • Propellers: Five bladed rotor



See also

Related development

Comparable aircraft

Related lists



  1. ^ James 1991, pp. 377–378.
  2. ^ Air International May 1981, p.215.
  3. ^ Carrara 2009, pp. 78–82.
  4. ^ Naval History website with explanation & photographs)
  5. ^ Lake 1996, p.128.
  6. ^ Lake 1996, pp. 128–129.
  7. ^ a b c Lake 1996, p.129.
  8. ^ a b c d Lake 1996, p.130.
  9. ^ a b Lake 1996, p.131.
  10. ^ a b Lake 1996, p.132.
  11. ^ a b Lake 1996, p.133.
  12. ^ James 1991, p.392.
  13. ^ Lake 1996, pp. 133–134.
  14. ^ a b c Lake 1996, p.134.
  15. ^ a b Lake 1996, p.135.
  16. ^ "The NAWSARH Project". Royal Norwegian Ministry of Justice and the Police. http://www.regjeringen.no/en/dep/jd/kampanjer/helicopters/about-the-project.html. Retrieved 2009-06-06.  
  17. ^ Per Erlien Dalløkken (2009-05-07). "De fem kandidatene" (in Norwegian). Teknisk Ukeblad. http://www.tu.no/motor/article208828.ece. Retrieved 2009-06-06.  
  18. ^ Air International May 1981, p.218.
  19. ^ James 1991, pp. 396–398.


  • Allen, Patrick. Sea King. London: Airlife, 1993. ISBN 1-85310-324-1.
  • Carrara, Dino. "Sea Kings to the Rescue". Air International, December 2009, Vol. 77 No. 6. ISSN 0306-5634. pp. 78–82.
  • Chartres, John. Westland Sea King: Modern Combat Aircraft 18. Surrey, UK: Ian Allen, 1984. ISBN 0-7110-1394-2.
  • Gibbings, David. Sea King: 21 years Service with the Royal Navy. Yeovilton, Somerset, UK: Society of Friends of the Fleet Air Arm Museum, 1990. ISBN 0-9513139-1-6.
  • James, Derek N. Westland Aircraft since 1915. London:Putnam, 1991. ISBN 0 85177 847 X.
  • Lake, Jon. "Westland Sea King: Variant Briefing". World Air Power Journal. Volume 25 Summer 1996. London:Aerospace Publishing. ISBN 1 847023 79 4. ISSN 0959-7050. pp. 110–135.
  • "Westland's Multi-rôle Helicopter Family: Omnifarious Sea King". Air International, May 1981, Vol. 20 No. 5. ISSN 0306-5634. pp. 215–221, 251–252.

External links


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