KC-46 Pegasus.

Technical Data

• Design

  The KC-46A Pegasus is a low-wing, twin-engine, wide-body tanker-transport developed around Boeing's 767-2C airframe, but its structure combines elements from several 767 variants. The fuselage is based on the 767-200ER, while the wing, landing gear, reinforced cargo floor and large main-deck cargo door derive from the 767-300F, with flap elements from the 767-400ER. The Pegasus measures 165 ft 6 in (50.5 m) long and 52 ft 10 in (15.9 m) high, with a 157 ft 8 in (48.1 m) wingspan. Maximum takeoff weight is 415,000 lb (188,240 kg), while the airframe accommodates 212,299 lb (96,297 kg) of fuel together with the refueling equipment, military avionics, defensive systems and transport installations.

  The tanker equipment is concentrated around the wings and aft fuselage. A fly-by-wire telescopic boom beneath the tail provides the principal high-flow refueling station, while a Centerline Drogue System supports probe-equipped receivers. The wings are provisioned for two Wing Aerial Refueling Pods, giving the aircraft three hose-and-drogue positions when both pods and the centerline system are installed, in addition to the boom. The KC-46 also carries its own aerial refueling receptacle, allowing it to receive fuel from another boom-equipped tanker and extend its endurance beyond that provided by its internal fuel supply.

  The main deck retains a freighter architecture, with a strengthened floor, a large side cargo door, and an integrated cargo handling system supporting up to 18 standard 463L pallets and 65,000 lb (29,484 kg) of cargo. The same compartment can carry 58 passengers in normal operations or up to 114 under contingency conditions. In aeromedical configuration, this capacity reaches 58 patients, including 24 litter and 34 ambulatory patients. Conversion between the principal cargo, passenger, and aeromedical configurations can be completed in less than two hours, although maximum fuel, cargo, and passenger loads cannot all be combined because they remain constrained by the aircraft's maximum takeoff weight.

  The crew arrangement differs significantly from the KC-135 Stratotanker because the boom operator is moved from the rear fuselage to the forward section. Two Aerial Refueling Operator Stations are installed immediately behind the flight deck and use the Remote Vision System (RVS) cameras to control the boom without direct visual contact with the receiver. The minimum crew consists of two pilots and one boom operator, while the forward compartment provides up to 15 crew seats, three rest bunks, a galley, lavatory, and storage. This arrangement supports additional pilots, boom operators, medical personnel, or other specialists during extended missions.

  The KC-46 also incorporates military-specific structural and survivability features absent from a commercial 767, including cockpit armor, electromagnetic-pulse (EMP) hardening, and nuclear, biological, and chemical (NBC) protection. These modifications are integrated with dedicated electronic and infrared self-protection equipment and night-vision-compatible systems. The tanker aircraft nevertheless retains the basic aerodynamic configuration and commercial-derived structure of the 767 family rather than using a purpose-designed low-observable airframe. Armor thickness, ballistic protection level, structural load limits, and EMP resistance thresholds are not disclosed in the available information.

• Avionics

  The KC-46 uses a Boeing 787-style digital flight deck adapted to its 767-derived airframe. Two pilots operate through large 15-in (38.1-cm) LCD displays presenting flight, navigation, engine, and aircraft system information. The aircraft nevertheless retains the conventional hydraulic and manual primary flight controls, rather than adopting the complete fly-by-wire architecture of the 787. The fly-by-wire designation applies specifically to the KC-46's aerial refueling boom, while the flight control architecture retains direct pilot authority throughout the flight envelope.

  The flight control system incorporates a Maneuvering Characteristics Augmentation System (MCAS) using two redundant angle-of-attack sensors. Unlike the 737 MAX arrangement, the KC-46 system disengages when the pilot makes a control stick input, allowing the crew to override augmentation directly. This architecture supports predictable handling across the aircraft's operating envelope while retaining the conventional control characteristics of the 767-derived design.

  The principal tanker-specific avionics installation is the Remote Vision System (RVS), which replaces the direct rearward view used by boom operators on earlier U.S. Air Force tankers. Multispectral external cameras transmit imagery of the receiver and boom to two Aerial Refueling Operator Stations immediately behind the flight deck. Operators use three displays, including a central 2D/3D view, with stereoscopic imagery providing depth cues for positioning the boom relative to the receiver receptacle. Infrared capability supports night and blackout refueling, while external director lights separately indicate the receiver aircraft's relative position.

  The original RVS 1.0 suffered from depth compression, curvature distortion, glare, shadows, and inadequate adaptation to rapidly changing illumination. These effects could alter the operator's perception of boom-to-receiver geometry during the final contact phase, when small positional errors can result in the boom striking outside the receptacle. An interim RVS 1.5 configuration introduced improvements while Boeing developed the substantially redesigned RVS 2.0 as the long-term solution.

  The RVS 2.0 introduces full-color 4K imagery, enhanced 3D viewing, upgraded long-wave infrared cameras, and six visible-spectrum panoramic cameras. The first RVS 2.0-equipped KC-46 flew in November 2025, followed by the completion of the initial non-contact airborne testing by June 2026, covering camera optics, processing hardware, controls, and equipment ruggedization. Initial fielding is scheduled for early 2028. Integration of installation with scheduled depot maintenance is intended to reduce the fleet-wide retrofit period from 13 years to seven years, while decreasing its effect on aircraft availability by 90%.

  The communications suite provides secure line-of-sight and beyond-line-of-sight connectivity, allowing the tanker to exchange information with receiver formations and command-and-control nodes during long-range operations. This architecture supports mission coordination, updated tasking, and situational awareness functions rather than limiting the aircraft to voice communications for fuel transfer operations. The KC-46's endurance and normal position alongside or immediately behind combat formations also make it suitable for relaying information between geographically separated aircraft and command elements.

  The Block 1 modernization expands this communications role through advanced LOS/BLOS connectivity, improved command-and-control functions, tactical network integration, and greater situational awareness. KC-46 testing has additionally included a C2 pod associated with the Advanced Battle Management System, intended to facilitate information exchange involving fifth-generation combat aircraft and other networked forces. These upgrades add communications relay and data distribution functions while retaining aerial refueling as the aircraft's principal mission.

• Engine and flight capabilities

  The KC-46A Pegasus is powered by two Pratt & Whitney PW4062 high-bypass turbofan engines, one mounted beneath each wing. Each develops 62,000 lbf (275.8 kN) of thrust, giving 124,000 lbf (551.6 kN) combined. Boeing retained an established 767-family engine installation rather than developing a military-specific propulsion system, while adapting the aircraft around the much heavier tanker mission equipment and fuel load. At the 415,000 lb (188,240 kg) maximum takeoff weight, the resulting thrust-to-weight ratio is 0.299, compared with 0.351 at the 353,534 lb (160,361 kg) maximum landing weight.

  Maximum speed is 570 mph (917 km/h), while normal cruise speed is 530 mph (853 km/h), equivalent to 461 kt (853 km/h). The difference between cruise and maximum speed is therefore only 40 mph (64 km/h). Service ceiling reaches 40,100 ft (12,222 m). These figures reflect a tanker optimized principally for fuel efficiency, endurance, and operation within receiver-compatible speed and altitude envelopes rather than maximum speed.

  The KC-46 has a stated unrefueled range of 6,385 nmi (11,825 km). At its 530 mph (853 km/h) cruise speed, covering that distance would mathematically correspond to 13.9 hours of continuous cruise, although actual flight endurance varies with climb, descent, reserves, routing, winds, aircraft mass, and mission profile. More importantly for tanker operations, maximum range cannot be combined with maximum fuel offload because the engines consume fuel from the same tanks supplying receiver aircraft.

  Maximum internal fuel capacity is 212,299 lb (96,297 kg), while maximum identified transferable fuel is 207,672 lb (94,198 kg). The latter represents 97.8% of nominal maximum fuel capacity, with a difference of 4,627 lb (2,099 kg) between the two published figures. This is a capacity comparison rather than an operational offload fraction: fuel consumed during taxi, climb, transit, orbit, return flight, and reserves directly reduces the quantity available to receivers. Moreover, the KC-46 carries 10% more fuel than the KC-135 Stratotanker, according to available information.

  A major endurance advantage is the KC-46's own aerial refueling receptacle, allowing another boom-equipped tanker to refuel it in flight. Tanker-to-tanker refueling can preserve fuel for receivers, extend time on station, or support intercontinental missions beyond the aircraft's normal 6,385 nmi (11,825 km) unrefueled range. For instance, during Project Magellan in 2024, a KC-46 remained airborne for 45 hours during a non-stop circumnavigation while receiving fuel in flight, demonstrating that mission endurance can be extended well beyond the aircraft's intrinsic fuel capacity when supporting tankers are available.

• Onboard equipment and self-defence

  The KC-46A Pegasus carries no offensive armament. Its survivability equipment instead combines threat warning, infrared and radio-frequency countermeasures, expendables, physical protection and aircraft hardening. This is particularly important because the Pegasus remains a large, non-stealth aircraft that can spend several hours on relatively predictable refueling tracks. Its defensive architecture is therefore intended to detect threats, disrupt missile guidance, reduce the probability of a successful engagement, and preserve essential aircraft functions rather than prevent detection.

  Protection against infrared-guided missiles is centered on Large Aircraft Infrared Countermeasures (LAIRCMs). The system detects an incoming missile threat and directs infrared energy toward its seeker to disrupt tracking, providing an active soft-kill response rather than relying exclusively on expendables. The KC-46 additionally carries flares, giving it a second defensive mechanism against heat-seeking weapons. The available information does not establish LAIRCM sensor or jammer quantities, detection range, engagement range, or flare capacity.

  Radar-guided threats are addressed through a Radar Warning Receiver (RWR) and electronic warfare equipment using programmable threat libraries to identify hostile emitters and support defensive responses. The KC-46 also employs chaff and radio-frequency countermeasures or decoys, combining expendable and electronic protection against radar-based threats. Because radar frequencies, waveforms, and operating modes can change, threat-library updates allow the aircraft's defensive capability to evolve without replacing the complete electronic warfare installation. Specific frequency coverage, jammer output and individual subsystem designations remain undisclosed.

  Physical survivability measures include cockpit armor, electromagnetic-pulse (EMP) hardening and nuclear, biological and chemical (NBC) protection. Cockpit armor provides additional protection for the flight crew against fragments and other battlefield hazards, while EMP hardening is intended to preserve essential aircraft and mission functions following severe electromagnetic effects. NBC protection supports continued operation in contaminated environments. Armor thickness, ballistic protection level, EMP resistance thresholds, and NBC filtration performance are not revealed.

  Reduced-light operations are supported by night-vision-compatible equipment and the multispectral Remote Vision System (RVS). Infrared imagery allows the boom operator to conduct refueling under blackout or very low-light conditions without requiring continuous conventional illumination of the tanker and receiver. Director lights remain available to provide the receiver pilot with positioning information concerning height, distance, and alignment when required.

  The KC-46 also uses secure line-of-sight and beyond-line-of-sight communications to receive updated threat information, coordinate with combat formations and modify refueling tracks as the tactical situation changes. The planned Block 1 modernization expands this capability through improved command-and-control, tactical connectivity, and situational awareness. Testing has additionally included a C2 pod associated with the Advanced Battle Management System, allowing the tanker's long endurance and position near combat formations to be exploited for communications relay and tactical data distribution.

  A future U.S. Air Force effort is examining hard-kill missile protection for large mobility aircraft, including the KC-46, KC-135, C-17, C-130 and C-5M. The objective is to physically intercept missiles that penetrate LAIRCM, electronic warfare, chaff, flares, and other soft-kill layers. Concepts cited include miniature interceptors measuring roughly 3.3 ft (1 m), while related large aircraft studies considered internal installations below 2,300 lb (1,043 kg) or external pods weighing 850-2,890 lb (386-1,311 kg), with a capacity against four to ten incoming missiles. These figures are not KC-46 specifications: no hard-kill system, launcher arrangement, interceptor quantity, or fielding date has been currently selected for the Pegasus.

• Refueling capabilities

  The KC-46 Pegasus combines both boom and hose-and-drogue refueling equipment with an aerial refueling receptacle for the tanker itself, allowing it to support both principal Western refueling standards and receive fuel in flight. Maximum internal fuel is 212,299 lb (96,297 kg), with a maximum identified transferable quantity of 207,672 lb (94,198 kg). The refueling architecture consists of an aft fly-by-wire boom, a Centerline Drogue System, and two optional Wing Aerial Refueling Pods, with a certification for 28 boom and drogue receiver types.

  The primary refueling system is an aft-mounted fly-by-wire telescopic boom with a maximum transfer rate of 1,200 US gal/min (4,542 L/min). It supports receptacle-equipped aircraft including the F-15, F-16, F-22, F-35, B-2, B-52 and C-17. The boom incorporates independent disconnect and automatic load-alleviation functions and is remotely controlled from the two Aerial Refueling Operator Stations behind the flight deck. Unlike the KC-135, the operator has no direct rearward view and instead controls contact through imagery supplied by the Remote Vision System.

  Early testing identified excessive boom axial loads. During a C-17 test in March 2015, aerodynamic interaction between the tanker and the receiver aircraft produced higher-than-expected forces, while the problem became particularly restrictive for the A-10, which could not consistently generate sufficient force to telescope the boom. Boeing subsequently replaced the original hydraulic relief-valve arrangement with a pressure-flow PQ valve to reduce required compression force. The issue demonstrates that receiver compatibility depends on aerodynamic interaction, boom loads, and receiver thrust in addition to physical nozzle-receptacle compatibility.

  Probe-equipped aircraft can use the Centerline Drogue System, which provides a single hose-and-drogue station rated at 400 US gal/min (1,514 L/min). The first probe-and-drogue fuel transfer identified occurred with an F/A-18 in February 2016, with other receivers including the AV-8B and the P-8. This enables the KC-46 to support the U.S Navy, U.S. Marine Corps, and allied probe-equipped aircraft while retaining its boom installation.

  Two optional Wing Aerial Refueling Pods (WARPs) add one hose-and-drogue station beneath each wing, each rated at 400 US gal/min (1,514 L/min). Together, their individual nominal ratings total 800 US gal/min (3,028 L/min). When installed, the pods permit two probe-equipped aircraft to refuel simultaneously, increasing fighter package throughput compared with sequential centerline contacts. All KC-46As are provisioned for WARPs, although the first 18 aircraft were initially delivered without the wing pods required for the complete contractual Required Assets Available configuration.

  Boom operation depends on the Remote Vision System, or RVS. The RVS 1.0 uses multispectral cameras and 2D/3D stereoscopic imagery, but testing identified depth compression, curvature distortion, glare, shadows, and dynamic lighting problems that could distort the apparent boom-receiver geometry. Consequently, the RVS 1.5 provided an interim improvement, while the RVS 2.0 is the planned long-term configuration with full-color 4K imagery, enhanced 3D visualization, upgraded long-wave infrared cameras, and six visible spectrum panoramic cameras. The first RVS 2.0-equipped KC-46 flew in November 2025, initial non-contact flight testing was completed by June 2026, and initial fielding is scheduled for early 2028. Installation during depot maintenance is intended to reduce fleet retrofit time from 13 years to seven years and lower the modification's availability impact by 90%.

  The KC-46 also carries refueling director lights to provide receiver pilots with visual cues for relative height, longitudinal position, and alignment. The tanker itself incorporates a boom-compatible aerial refueling receptacle, allowing another tanker to replenish it in flight and extend endurance beyond its 6,385 nmi (11,825 km) unrefueled range. During Project Magellan in 2024, this capability supported a 45-hour non-stop circumnavigation, demonstrating tanker-to-tanker refueling for missions extending far beyond the endurance available from the KC-46's initial fuel load.

  By May 31, 2022, the KC-46 was cleared for 97% of daily joint force refueling taskings, followed by worldwide deployment clearance on September 14, 2022. Its combination of a 1,200 US gal/min (4,542 L/min) boom, 400 US gal/min (1,514 L/min) centerline drogue, two 400 US gal/min (1,514 L/min) wing pods, and receiver receptacle allows the same aircraft to support boom receivers, probe-equipped aircraft, simultaneous two-point probe refueling and tanker-to-tanker refueling.

The KC-46's principal refueling device is a fly-by-wire telescopic boom mounted beneath the rear fuselage. It is intended primarily for aircraft equipped with an aerial refueling receptacle, including U.S. Air Force fighters, bombers, and transport aircraft.