Military Aviation

RAF ‘Looking At’ Requirement for Boom-Equipped Tankers

Published on: July 16, 2026 at 5:55 PM CEST
Kai Greet Kai Greet
RAF A330 Boom Tanker Requirement
A RAAF KC-30A Multi-Role Tanker Transport from 33 Squadron, left, conducts air-to-air refuelling trials with a US Air Force Boeing RC-135. (Image credit: U.S. Air Force photo by Todd Schannuth)

A Royal Air Force official at the Global Air and Space Chiefs’ Conference 2026 has confirmed that the planned GCAP fighter will be designed for boom refueling, meaning it will not be compatible from the outset with the RAF’s hose and drogue refueling system.

Gareth Jennings, Aviation Desk Editor for Janes, quotes an unnamed official at the Air Power Association’s annual Global Air and Space Chiefs’ Conference, saying: “We currently do not have boom in the UK. We have a requirement for boom from GCAP. We have to resolve that requirement, and that is what we’re now looking at.”

This follows previous renderings which have depicted the GCAP fighter with what appears to be a door for a refueling receptacle but not with any similar hatch that would contain an extendable refueling probe.

The RAF has long maintained a preference for hose and drogue refueling, sometimes at the significant cost of bespoke modifications to aircraft designed for boom refueling.

Voyager ZZ336, or ‘Vespina’, refueling two F-35B aircraft. (Image Credit: Corporal Alex Scott/Crown Copyright 2022)

While offering a reduced fuel transfer rate compared to the flying boom system preferred by the U.S. Air Force and subsequently adopted by many other air arms, the more compact hose and drogue system can allow the simultaneous refueling of multiple receivers from one tanker aircraft, and has historically allowed aircraft without a built-in refueling capability to be modified with fixed probes and fuel piping.

Such modifications were made to the RAF’s VC10s and Tristars when converted from civilian specification, and were adopted onto the Avro Vulcan and Handley-Page Victor early in their careers. The Hawker Siddeley Nimrod also received this upgrade as an urgent requirement for the 1982 Falklands War. This continued in use for decades until the 2006 crash of Nimrod MR2 XV230 over Afghanistan, causing the death of all 14 on board. The cause was narrowed down to a fuel leak or overflow suffered during aerial refueling, and all aerial refueling operations with the Nimrod were halted from 2007. 

Modern, stringent airworthiness regulations had already called the Nimrod’s safety into question, and they most certainly would prevent any further modifications to an aircraft’s fuel system without a significant testing and certification process. As such, many aircraft have now been introduced into RAF service without any modifications and therefore without any chance of being refueled by the RAF’s own tanker fleet. This includes the RC-135W Rivet Joint, the P-8A Poseidon MRA1, the C-17A Globemaster III, and, soon, the E-7A Wedgetail AEW1. 

The recent decision to procure 12 F-35A Lightning II aircraft as part of the next tranche of F-35 orders will add yet another boom-refueling only aircraft to the RAF’s inventory. While a hose and drogue modification for the F-35A is said to be possible, no customer has specified this option and it is unlikely it would be put into service for such a small purchase of jets. 

Although the A330 MRTT is used across the world with a flying boom system, the RAF’s examples, known as Voyagers – owned by the AirTanker consortium and leased to the RAF through a private finance initiative (PFI) – are fitted for hose and drogue refueling operations only. Voyager KC2 aircraft are configured with two wing-mounted Cobham 905E hose and drogue units while Voyager KC3 aircraft additionally feature a Cobham 805E Fuselage Refueling Unit (FRU) in the rear fuselage with the option for a higher fuel transfer rate for larger aircraft like the Airbus A400M.

While still relatively new, the RAF’s Voyagers are among the oldest MRTTs in service. Deliveries began in 2011, and were completed in 2016. Of the fourteen aircraft delivered, nine form a ‘core’ fleet permanently available for military service while the five remaining jets can be made available for civilian charter or lease when not required by the Ministry of Defence (MoD).

Each Voyager has both a military serial and a civilian registration assigned to it for this reason, and aircraft have occasionally moved between the core and surge fleets as required. When carrying a civilian registration the military modifications are removed and for all intents and purposes they revert to being Airbus A330-200s. One particular aircraft, ZZ336, was chosen to receive special upgrades for VIP transport in 2015, and was later adorned with a UK Government paint scheme. Though still occasionally used for VIP duties, this is now more often covered by an A321neo on a long term charter from Titan Airways. ZZ336, or Vespina as it is also known, is therefore commonly seen supporting UK training sorties or Quick Reaction Alert (QRA) operations. 

It has frequently been said that AirTanker would oppose the modification of Voyager aircraft with the flying boom system as it would complicate moving aircraft between the civil and military fleets. However, whenever approached with such an idea AirTanker officials have suggested there would be no issue with such a move, and that it just required the commitment and funding from the MoD to make it happen. 

Notably, the current PFI for the Voyager aircraft is due to expire in 2035, less than 10 years away, and the official out of service date for the Voyager matches this. By this time, the oldest Voyagers will be over 20 years old and be ideal candidates for replacement. It may, instead of modifications, therefore be prudent to instead pursue an alteration and/or extension of the contract that covers the procurement of new-build airframes with the flying boom system already installed. 

Adding boom refueling to the RAF’s capabilities has been one of the most talked about ‘small’ improvements that could be made for some time, both among seasoned commentators and enthusiasts. As well as opening up the opportunity of better supporting the RAF’s boom-only aircraft, which currently rely primarily on U.S. Air Force tanker support when required, it would permit greater interoperability with the many NATO allies who operate boom-only aircraft like the F-35A and the F-16. 

The prospect of GCAP joining the ranks of boom-only RAF aircraft may become the straw that breaks the camel’s back. The long range of the P-8, C-17, and E-7, and the close cooperation of RAF RC-135s with USAF operations, can allow the RAF to argue that organic refueling of these aircraft is a low priority, but being unable to refuel what is due to be the RAF’s premier combat aircraft of the future would introduce a critical flaw in the service’s ability to project sovereign air power.

However long-legged the GCAP fighter will be, we can see from current operations that fighter missions without some form of tanker support are almost unheard of. 

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By Kai Greet
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Kai is an aviation enthusiast and freelance photographer and writer based in Cornwall, UK. They are a graduate of BA (Hons) Press & Editorial Photography at Falmouth University. Their photographic work has been featured by a number of nationally and internationally recognised organisations and news publications, and in 2022 they self-published a book focused on the history of Cornwall. They are passionate about all aspects of aviation, alongside military operations/history, international relations, politics, intelligence and space.
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