Spain Picks Airbus A321 For New Electronic Intelligence Aircraft

Spain is moving ahead with plans to rebuild its airborne signals intelligence (SIGINT) capability, with the Airbus A321 — part of the highly successful A320 twin-engine airliner family — selected as the basis for three new SIGINT aircraft.

The choice is disclosed in the latest issue of Spain’s Revista de Aeronáutica y Astronáutica, the Ministry of Defense’s official publication. Airbus and Indra are currently working on the program’s conceptual design under the Santiago II initiative, which aims to deliver a crewed platform capable of collecting and processing intelligence across the electromagnetic spectrum.

The program is intended to restore a capability Spain lost when its last Boeing 707 SIGINT aircraft was retired in 2014. Equipped with Israeli SIGINT equipment, this 707 was designated TM.17-4 in Spanish service, and nicknamed Reina del Espectro (Queen of the Spectrum).

También del #47Grupo el #Boeing 707-351C (TM.17-4 / 47-04) "BRUJO". #BASanJavier @EjercitoAire @SpottersMurcia pic.twitter.com/RB3Dcpn7Qp

— Salvador Marín (@05derecha) April 17, 2020

It served in the 47th Mixed Air Force Group, alongside four Dassault Falcon 20s (designated TM.11 in Spain), that were used for navigation aid calibration, remote sensing, and electronic warfare training.

A Spanish Air Force Falcon 20 EW. Roberto Yáñez/Spanish Air and Space Force COPYRIGHT ROBERTO YANEZ

The new aircraft will have to undergo extensive modification, including the installation of antennas, receivers, signal-processing equipment, operator consoles, communications systems and associated electrical and cooling infrastructure.

Indra is expected to provide much of the mission-system architecture. The company’s AirSign concept, unveiled in 2023, incorporated COMINT and ELINT sensors alongside data fusion, real-time signal analysis, communications, and command-and-control functions.

An earlier Airbus concept for a multi-mission A320neo family, including an AEW&C version with conformal radar arrays, a SIGINT platform, and a VIP jet. Airbus

While COMINT is concerned primarily with collecting intelligence from communications, ELINT focuses on non-communications electromagnetic emissions, including radar signals. Together, these capabilities provide a much fuller intelligence picture of not only what the enemy is doing in terms of their electronic emissions, but what they are planning, and their processes of operation.

Bizjets have become the platform of choice for many new intelligence aircraft, particularly where operators want a relatively low-cost, long-endurance platform with a smaller logistical footprint. Aircraft such as the Bombardier Global 6000/6500, Gulfstream G550, and Dassault Falcon 8X have been adapted for electronic intelligence and special-mission roles.

An Israeli Air Force Nachshon Oron multi-mission intelligence-gathering aircraft, based on a Gulfstream G550 airframe. Israeli Air Force

Spain’s decision to use the substantially larger A321 points instead toward the other end of the spectrum, providing significantly more room for antennas, processing hardware and crew, and allowing the aircraft to carry a much larger and more power-hungry mission system than the typical bizjet-based SIGINT platform.

At one time, the A321 was envisaged as the platform for NATO’s Alliance Ground Surveillance (AGS) system, which provides the alliance with reconnaissance capabilities, including synthetic aperture radar. However, this capability was eventually fielded on NATO’s fleet of five RQ-4D Phoenix uncrewed aerial vehicles, specialized versions of the Global Hawk.

Early concept artwork showing an A321 equipped with NATO’s Alliance Ground Surveillance (AGS) system. NATO

Elsewhere in Europe, Airbus launched a risk-assessment study for France’s future maritime patrol aircraft (MPA), also to be based on an A321 platform. Billed as a “flying frigate” by the company, the new MPA is intended to replace the French Navy’s Dassault Atlantique 2 fleet and emerges at a time when NATO nations are increasingly adopting the in-production Boeing P-8 Poseidon for their maritime patrol requirements.

A rendering of the A321 MPA, France’s future maritime patrol aircraft. Airbus

Airbus does, however, have relevant experience in the conversion of airliners for military roles. The company’s A330 Multi-Role Tanker Transport (MRTT) aircraft are modified at Airbus’s Getafe facility, providing an existing industrial base for converting commercial-derived aircraft into specialized m

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