Military Aviation

Japan’s “Platypus” EC-2 Stand-Off Jammer Flies for the First Time

Published on: March 18, 2026 at 12:25 PM
Stefano D'Urso Stefano D'Urso
Japan EC-2 flight
The Kawasaki EC-2 SOJ photographed during its first flight. (Image credit: JASDF)

Japan has started the flight testing of the EC-2 Stand-Off Jammer aircraft, whose unusual shape has attracted widespread interest among aviation enthusiasts.

Japan’s EC-2 Stand-Off Jammer aircraft has finally conducted its first flight on Mar. 17, 2026, after its unusual appearance – due to the fairings for the specialized equipment – caught widespread interest among aviation enthusiasts. The aircraft has already earned a number of monikers, from the “Platypus” already held by its predecessor – the EC-1 – to the “world’s ugliest aircraft,” with the latter sparking debate in the aviation community about which aircraft should hold this title.

The aircraft was first spotted at Gifu Air Base in February 2026, parked on the apron. Few days ago, the aircraft was spotted again while conducting taxi testing both at low and high speed in preparation for the first flight, with the number of photos and videos online quickly increasing.

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The EC-2, which was also visible on flight tracking websites, took off for the maiden flight at 11:30 am local time, returning after approximately three hours. It is unclear if it was accompanied by a safety chase aircraft.

The flight test campaign is being conducted by the Japan Air Self-Defense Force’s (JASDF) Aviation Development and Testing Group and the Acquisition, Technology & Logistics Agency (ATLA). In a post on social media, the JASDF said it “will continue working toward its introduction to improve capabilities in the electromagnetic domain and to strengthen the cross-domain operations capabilities.”

EC-2 Stand-Off Jammer official photos
The Kawasaki EC-2 SOJ photographed on the ramp at Gifu Air Base. (Image credit: JASDF Aviation Development and Testing Group)

EC-2 SOJ

As we mentioned in our previous reports here at The Aviationist, the EC-2 is the latest in a number of Japanese aircraft with unusual modifications, and has been in development since 2021. Before being spotted in February 2026, the secretive aircraft was only shown only in a rendering by the Ministry of Defense.

The new EC-2 Stand-Off Jammer (SOJ) is a derivative of the Kawasaki Heavy Industries (KHI) C-2 transport aircraft. Notably, the airframe selected for the conversion is the former C-2 18-1203, the type’s first production airframe.

The aircraft has been modified with a bulbous nose – similar to the EC-1 it will replace – as well as two large bulges on the top of the fuselage, while two more are located on the sides of the fuselage between the wings and the horizontal stabilizers. These are meant to host a variety of specialized equipment, such as Electronic Support Measures (ESM), Electronic CounterMeasures (ECM), and satellite communications (SATCOM).

The EC-2 is being developed to disrupt an adversary’s electronic warfare (EW) capabilities while still flying outside of the threat’s range. The Japanese Ministry of Defense previously said the aircraft will be used to support counter air operations in conjunction with other tactical assets.

Details about the program are currently limited, and only found in the MoD budget documents, which mention ¥41.4 billion have been allocated to the development. This is included in a larger ¥508.6 billion investment to strengthen intelligence collection and analysis capabilities.

The development of both the EC-2 and RC-2 (the C-2’s other specialized variant) platforms is specifically mentioned as part of the MoD’s effort to “Improve capabilities to gather electromagnetic information necessary for electronic jamming and electronic protection” and “Develop necessary equipment to constantly and continuously gather, process, and analyze information especially on military trends in the vicinity of Japan.”

The aircraft will replace the unique EC-1, which was fielded in 1986 and retired in 2025, but in a larger fleet. In fact, while the EC-1 program resulted in a single aircraft, the EC-2 fleet will include four aircraft, according to MoD budget documents.

The program is divided in two phases, focusing on the integration of the new capabilities and their refinement, respectively. Testing is expected to be completed in this fiscal year, with fielding planned for 2027.

Among the equipment there will be components inherited from the EC-1, such as the J/ALQ-5 electronic countermeasures (ECM) system and advanced radio wave measurement systems. The aircraft is expected to be operated by the Denshi Sakusengun (Electronic Warfare Operations Group) at Iruma Air Base, the same which operates the EC-1 and will in future also operate the RC-2.

The other specialized variant

The RC-2 is the C-2’s first specialized variant, which has been designed for signal intelligence (SIGINT) and electronic intelligence (ELINT) roles after the program was launched in 2015. The airframe used for this program is the former C-2 18-1202, the type’s second prototype.

The aircraft was modified with similar, but smaller, bulges compared to the EC-2. These include an enlarged nose section, two bulges on the top of the fuselage, two on the sides of the rear portion of the fuselage, as well as enlarged fairings on top of the tail and the tail cone.

It is unclear which type of specialized equipment is installed, but these would normally includes multiple arrays and antenna for wideband receivers, supported by signal processing hardware. These will allow the RC-2 platform to collect and analyze signals from an adversary’s emitters in order to generate an Electronic Order of Battle (EOB).

File photo of the RC-2 taking off for a sortie. (Image credit: Japanese Ministry of Defense)

Similarly to the EC-2, the RC-2 was first spotted during testing at Gifu Air Base in February 2018. The aircraft replaced the obsolete JASDF’s YS-11EB aircraft of the Electronic Intelligence Squadron retired in 2021, a year after the RC-2 was officially inducted in service.

The RC-2 is explicitly mentioned in the Japanese MoD’s budget document in the line regarding the acquisition of a single SIGINT aircraft for ¥49.6 billion. This line is part of the same ¥508.6 billion investment to strengthen intelligence collection and analysis capabilities which includes the EC-2.

Kawasaki C-2

The C-2 is a long range twin-engine transport aircraft designed by Kawasaki to replace its earlier C-1 transport aircraft. The aircraft is, like its predecessor, a homegrown Japanese design, which flew for the first time in January 2010 and entered service six years later in 2016 with 18 airframes.

The first and third Kawasaki C-2 aircraft. (Image credit: Japanese Ministry of Defense)

While smaller than other four-engined jet transport aircraft like the C-17 Globemaster III, the C-2 is significantly larger than the C-1 it replaced or the other twin-engine military jet cargo aircraft, the Embraer C-390. The aircraft is roughly equivalent in capacity to the Airbus A400M, but offers a higher cruise speed, service ceiling, and increased range.

The C-2 is capable of transporting 110 people and can fly for about 7,600 kilometers (4,100 NM) with 20 tons of cargo or 4,500 km ( 2,400 NM) with a payload of 36 tons. The aircraft is also able to take-off in 500 m from semi-prepared runways.

The C-2 uses General Electric CF6 turbofan engines which are widely employed in both civilian and military service. These are notably used also by Japan’s KC-767 tankers, though the newer KC-46s instead use Pratt & Whitney powerplants.

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By Stefano D'Urso
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Stefano D'Urso is the Deputy Editor at The Aviationist, based in Lecce, Italy. He holds a Bachelor’s Degree in Industrial Engineering and is currently pursuing a Master’s Degree in Aerospace Engineering. His areas of expertise include emerging aerospace and defense technologies, electronic warfare, unmanned and autonomous systems, loitering munitions, and the application of OSINT techniques to the analysis of military operations and contemporary conflicts.
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