Westland Sea King

Updated: October 2026 – A yellow helicopter hanging in a storm over a fishing boat off the Welsh coast. A gray naval helicopter lifting off from the deck of a supply ship in the North Sea. Both pictures belong to the same aircraft: the Westland Sea King. For four decades it was the epitome of the rescue helicopter in Britain and Germany. Now it has been retired by almost all European users – which makes it all the more worthwhile to know it. Here is how to identify it with confidence, which versions there were and where you can still get it in front of your lens today.

What is the Westland Sea King?

The Sea King is a twin-engine naval and rescue helicopter in the ten-ton class. Its origins lie in the USA: in the late 1950s Sikorsky developed the SH-3 Sea King (company designation S-61) as an anti-submarine helicopter for the US Navy; it first flew in 1959. Westland in Yeovil secured the license and built its own British family from it.

The British adopted the basic design but changed a lot under the skin. Instead of the American General Electric T58, the Sea King received two Rolls-Royce Gnome turbines – a development of that very T58, built under license in Britain. Added to this were an automatic flight control system, British sensors and its own mission equipment. The first Sea King built in Yeovil, a HAS.1 for the Royal Navy, flew on May 7, 1969.

How many aircraft Westland built in total is not stated consistently in the sources; the figures range from around 330 to a good 340. The manufacturer itself later merged into AgustaWestland and finally into Leonardo. The successor, the three-engine AW101 Merlin, was developed by Westland together with Agusta – explicitly as a replacement for the Sea King.

Why a boat hull?

The Sea King is built for operations over open sea. Its fuselage has a watertight, boat-shaped bottom, and the side sponsons give it stability. In an emergency it can set down on calm water and float for a while. The sponsons also house the retractable main landing gear. For identification this is a gift: hardly any other large helicopter in Europe has this combination of boat hull and sponsons.

The features that are enough to identify it

Once you have consciously seen a Sea King, you will hardly confuse it again. Three looks are enough.

The paint scheme helps as well: bright yellow stands for the RAF’s rescue helicopters, gray for naval versions, green or camouflage colors for the Royal Marines’ transport version. The final confirmation comes from the serial – on British aircraft a serial number like XZ585, on the German Navy a serial in the format 89+xx. How German military serials are structured is explained in the article Registrations of Bundeswehr aircraft.

Sea King, Merlin, NH90 or Lynx?

At museums and air shows, several naval helicopters often stand side by side. The quick comparison helps you sort them out.

Feature	Sea King	AW101 Merlin	NH90	Lynx
Engines	2	3	2	2
Main rotor blades	5, plain	5, paddle tips	4	4
Fuselage	Boat hull with sponsons	tall, with sponsons	compact, rounded nose	small, stocky
Landing gear	retractable into sponsons	retractable into sponsons	nosewheel landing gear	skids or wheels
Status in Europe	largely retired	active	active	partly retired, partly still active

The AW101 Merlin replaced the Sea King with the Royal Navy and in the Norwegian rescue service, among others. In Germany the NH90 took over the role as the Sea Lion. The Westland Lynx comes from the same factory, but is much smaller and was mainly a shipboard helicopter on frigates. The British rescue service is now flown by the Sikorsky S-92 and the Leonardo AW189.

For a broader overview of rotorcraft, see the guide How to identify helicopter types.

The main versions

Westland made a whole family out of the basic design. For spotters and museum visitors, these designations are important:

• HAS.1, HAS.2, HAS.5, HAS.6: the Royal Navy’s anti-submarine versions, fitted over the years with ever better sonar and radar. Recognizable by the radar hump on the back.
• AEW.2 and ASaC.7: early warning versions with a large radar container on the side. After the experience of the 1982 Falklands War, the Royal Navy first converted two HAS.2 at short notice; this grew into a fleet of its own. The ASaC.7 was the Royal Navy’s last Sea King version and retired in September 2018.
• HAR.3 and HAR.3A: the yellow rescue helicopters of the Royal Air Force, in service from 1978.
• HC.4 / Commando: the transport version for the Royal Marines with fixed landing gear and without the large sponsons. According to sources, it carried up to 28 soldiers.
• Mk 41: the German Navy’s search and rescue version.
• Mk 43: the Norwegian rescue version.
• Mk 48: the Belgian rescue version, five aircraft.

Export customers outside Europe included India, Pakistan and Egypt, among others. According to the available sources, Sea Kings and Commandos are still in service in some of these countries – how many of them actually fly can hardly be reliably quantified from public information.

The RAF rescue story: a yellow legend

For many Britons, the Sea King is inseparably linked with sea and mountain rescue. From 1978 the RAF flew the HAR.3 version in the search and rescue service, joined later by the modernized HAR.3A. The helicopters belonged to 22 and 202 Squadrons, and training took place with 203 Squadron at RAF Valley on Anglesey.

The rescue bases were spread across the whole country, most recently including Chivenor in Devon, Wattisham in Suffolk, Valley in Wales, Boulmer in Northumberland, Lossiemouth in Scotland and Leconfield in Yorkshire. Crews stood ready around the clock to pick up sailors, fishermen, mountain hikers and the injured. On the Falkland Islands, too, the RAF provided Sea Kings for rescue service with 1564 Flight for a long time.

The most prominent pilot was Prince William, who flew the Sea King as a rescue pilot from RAF Valley. He and Catherine also took part in the rescue fleet’s farewell parade on February 18, 2016.

The end came with privatization: on October 4, 2015, Bristow Helicopters took over the nationwide rescue service on behalf of the British Coastguard, HM Coastguard. The individual bases handed over their Sea Kings one after another during 2015; at Chivenor, the last operational RAF mission in Britain ended on October 5, 2015. Since then, red and white S-92s and AW189s have flown the missions. How to find such rescue flights live today is shown in the guide Finding rescue and offshore helicopters on the flight tracker.

Sea King Mk 41 with the German Navy

The Sea King made history in Germany too. Between April 1973 and September 1974 the Navy received 22 Sea King Mk 41s; one more aircraft followed in 1975 to replace a helicopter lost in a storm. By 1975 at the latest, the type took over the Navy’s search and rescue service from the older Sikorsky H-34.

The operator was Marinefliegergeschwader 5 (Naval Air Wing 5). For decades it was based at Kiel-Holtenau; in 2012 the wing moved to Nordholz near Cuxhaven, and the crews celebrated the departure from Kiel in November 2012. From there and from outstations on the coast, such as on Helgoland, the Sea Kings covered rescue service over the sea.

In addition to SAR duty, the Mk 41 became a shipboard helicopter on the Berlin-class replenishment ships. In this role it flew off the Horn of Africa, off Lebanon as part of UNIFIL and in the relief effort after the tsunami in South Asia at the end of 2004, among other missions. Over the years the fleet was modernized several times, including the engines from 2006. The crew consisted of two pilots, an aircraft operations officer and a flight engineer.

Toward the end its age showed clearly: for the first half of 2016, an operational readiness of only about 29 percent was reported. From 2017, a private provider in southern England supported training with former British Sea Kings. Replacement came with the NH90 NTH Sea Lion: the first aircraft arrived at Nordholz in fall 2019, and flight operations began in 2020. After the NH90 training center was also handed over at the end of 2023, the Sea King’s service with the Navy ended in 2024. In early 2024 it was also reported that Germany is handing six Sea Kings over to Ukraine.

When	Event
1973–1975	Delivery of 22 plus 1 Sea King Mk 41
from 1975	Navy SAR service fully on the Sea King
2012	MFG 5 moves from Kiel-Holtenau to Nordholz
2019/2020	NH90 Sea Lion arrives at Nordholz and enters service
2024	Retirement of the last Sea King Mk 41

If you want to dig deeper into the history of German naval aviation, the Aeronauticum Nordholz right next to the air base is the right place. For rotorcraft in general, the Hubschraubermuseum Bückeburg (helicopter museum) is worth a visit.

Retirement in Europe

Little by little, the Sea King disappeared from European armed forces:

• Britain: RAF rescue service until 2015, the last Royal Navy version, the ASaC.7, until September 2018.
• Belgium: The last aircraft was retired on March 21, 2019.
• Norway: The rescue Sea Kings were replaced by the AW101 from 2020; service ended there in 2023.
• Germany: Retired in 2024, successor NH90 Sea Lion.

That makes every flying sighting something special today. You can gauge how rare such an entry in your collection is with the article How rare is my sighting?.

Where to see the Sea King today

Museums are the surest address. According to publicly available inventory lists, these aircraft, among others, are on display – holdings can change through loans and rebuilds, though:

Location	What to expect
Fleet Air Arm Museum, Yeovilton	Two Sea Kings, including a Commando nicknamed “King of the Junglies”
RAF Museum London-Hendon	Sea King from the RAF inventory
Imperial War Museum Duxford	Sea King in the large collection of British military aviation
Royal Army Museum Brussels	Belgian rescue Sea King RS01

The Fleet Air Arm Museum has a special bonus: it lies right at RNAS Yeovilton, where the Royal Navy’s Merlin transport helicopters fly today. So you see the Sea King in the museum and its successor in the sky – and the Westland factory in Yeovil is not far. At the Imperial War Museum Duxford you can also combine the museum visit with the air shows there; tips are in the article IWM Duxford and its air shows.

Flying Sea Kings still exist in Britain with a historic helicopter group in Somerset, which maintains several former British and Belgian aircraft. Such vintage machines occasionally turn up at air shows, for example at the Royal International Air Tattoo. Whether a Sea King is on the program, you check beforehand in the participant lists.

What is allowed at active air bases is summarized in the article Photographing military airfields: rules.

Photo tips specifically for the Sea King

Whether in the hall or in the air, the Sea King has character. A few points bring it out well in the picture.

You will find more on the technique in the guide Photographing propellers: the right shutter speed. General tips on rotorcraft are collected in Helicopter spotting.

Common mix-ups and how to rule them out

Conclusion

The Westland Sea King is a piece of European aviation history: designed in America, reimagined in Yeovil with British turbines and in service for decades over the North Sea, the Baltic, the Irish Sea and the mountains of Britain. The yellow RAF aircraft and the German Navy’s Mk 41 are now history, but the type lives on in museums and with historic groups. If you are looking for one today, you are more likely to plan a museum day or a British air show than an evening at the airport fence.