AgustaWestland Merlin

The AgustaWestland Merlin HC3 served the Royal Air Force as a medium-lift battlefield-support helicopter from 2001 to the mid-2010s. Developed from the three-engined EH101, later designated AW101, it combined substantial cabin capacity, long-range capability and advanced navigation and defensive systems. Based principally at RAF Benson, Merlin helicopters operated with Nos. 28 and 78 Squadrons and deployed to Bosnia, Iraq and Afghanistan before the fleet transferred to Royal Navy control.

A modern support helicopter for expeditionary operations

The Merlin HC3 grew out of Britain’s decision in the 1990s to acquire a modern medium-lift helicopter with more reach and flexibility than older support types could offer. The RAF ordered 22 Merlin HC3 helicopters in 1995, with aircraft delivered for evaluation and training before the type entered service in 2001. Five Merlins were formally received at RAF Benson on 7 March 2001, and No. 28 (Army Cooperation) Squadron re-formed there on 17 July. The squadron achieved its initial operational capability in April 2003, when it deployed to Bosnia.

What distinguished the Merlin HC3 was not simply size, but the combination of features it brought together in one airframe. It had three RTM322 engines rather than two, a rear loading ramp for bulky cargo, extended-range fuel tanks, an air-to-air refuelling probe and enough cabin space to move a substantial body of troops or stores in one lift. That made it particularly valuable for the sort of campaigns the RAF increasingly supported after the Cold War, where aircraft had to move men and equipment over long distances and into austere landing sites rather than between major prepared airfields.

The aircraft was also adaptable. It could carry troops seated in the cabin, lift underslung loads beneath the fuselage, move stretchers for casualty evacuation and operate in demanding climates. In practical RAF service that meant the Merlin HC3 sat between lighter battlefield helicopters and the heavier Boeing Chinook. It did not replace every other type, but it gave commanders an aircraft with greater reach and endurance than Puma and a different kind of flexibility from Chinook, especially when missions required a combination of speed, payload and self-deployment range.

RAF Benson, squadron service and operational use

RAF Benson became the centre of Merlin HC3 operations. 28 Squadron introduced the type to service, and in December 2007 78 Squadron was formed as a second Merlin unit. From Benson the aircraft developed from a new-capability platform into a well-used operational asset. The Merlin’s first operational deployment came in the Balkans in 2003, where it began to prove its value in real expeditionary conditions rather than in exercises alone.

The Merlin force expanded with the acquisition of six former Royal Danish Air Force helicopters, designated HC3A in British service. Delivered during 2007–08, these aircraft increased the RAF’s Merlin fleet from 22 to 28. Differences in their equipment and configuration required adaptation and initially favoured their use for training, helping release HC3 aircraft for operational deployments. Their arrival supported the establishment of No. 78 Squadron as a second Merlin unit at RAF Benson.

RAF Merlin operations in Iraq began in March 2005, when 1419 Flight deployed to Basra under Operation Telic. The aircraft supported coalition operations through troop transport, casualty evacuation, reconnaissance and other battlefield-support tasks. Merlin’s range, cabin capacity and defensive equipment made it valuable across southern Iraq, where helicopter mobility reduced reliance on vulnerable road movements. RAF crews operated in demanding conditions, and the service of Flight Lieutenants Kev Harris and Michelle Goodman was recognised through awards of the Distinguished Flying Cross.

Merlin HC3 helicopters deployed to Afghanistan in November 2009 as part of Operation Herrick. Operating in demanding hot-and-high conditions, they transported troops, equipment and supplies, supported casualty movements and provided tactical mobility across difficult terrain. The deployment formed part of Britain’s efforts to increase helicopter lift in Afghanistan, where road movement carried substantial risks. Merlin operations continued until June 2013, when the aircraft were withdrawn as British forces progressively reduced their presence.

Operationally, the Merlin HC3 demonstrated the value of a support helicopter that could do more than simply shuttle personnel. It was a systems aircraft as much as a flying truck: long-range, all-weather, capable of self-deployment and robust enough for sustained operations abroad. In that sense it became part of the RAF’s wider adaptation to post-Cold War expeditionary warfare, where air mobility, medical evacuation and logistics often mattered as much as strike or air defence.

Transfer, conversion and the Merlin’s RAF legacy

Plans announced in 2009 provided for the RAF’s Merlin HC3 and HC3A fleet to transfer to the Royal Navy’s Commando Helicopter Force, replacing the Sea King HC4 in the battlefield-support role. The formal handover took place at RAF Benson on 30 September 2014, when No. 78 Squadron disbanded and 846 Naval Air Squadron stood up. No. 28 Squadron continued operating Merlin temporarily during the transition, completing its involvement in July 2015. The former RAF aircraft subsequently underwent conversion to the naval HC4 and HC4A standards, incorporating modifications for shipborne and amphibious operations.

The Merlin HC3 brought improved range, capacity and operational flexibility to the RAF’s support-helicopter force. Its service demonstrated the importance of reliable tactical lift for expeditionary operations, particularly during prolonged deployments in Iraq and Afghanistan.

The transfer to the Royal Navy in 2014–15 carried that capability into the Commando Helicopter Force. Although the RAF’s direct association with the Merlin was relatively short, its operational record with Nos. 28 and 78 Squadrons formed an important chapter in British battlefield aviation.