KAAN Fighter Jet: Turkey’s Fifth-Generation Combat Aircraft Program

The Turkish KAAN fighter program has gotten complicated with all the “will it achieve true fifth-generation stealth capability” debates, the engine dependency questions around when Turkey will field a domestic powerplant versus relying on foreign engines, and “how does KAAN compare to the F-35 program Turkey was excluded from” conversations flying around. As someone who has spent years following combat aircraft development programs and the specific engineering challenges that determine whether a nation’s fighter ambitions produce an operationally credible aircraft, I learned everything there is to know about the KAAN program. Today, I will share it all with you.

But what is KAAN, really? In essence, it’s Turkey’s first domestically developed fifth-generation stealth fighter — a TAI (Turkish Aerospace Industries) program that represents the country’s most ambitious defense aerospace project and a direct response to being excluded from the F-35 program following the S-400 procurement dispute with the United States. But it’s much more than a political statement. For Turkey’s defense posture, KAAN represents the difference between strategic dependence on foreign aircraft suppliers and the operational independence that comes with a domestic advanced fighter capability.

Origins and Program Background

The KAAN program draws on Turkey’s previous aerospace development experience while pushing significantly beyond it. Key program foundations include the earlier Hürjet advanced jet trainer (which shares development resources), substantial government investment in TAI’s engineering workforce, and technology transfer arrangements with partner nations. The aircraft made its first flight on February 21, 2023 — a milestone that validated years of airframe development work and positioned Turkey among the small group of nations capable of developing indigenous advanced combat aircraft.

Design and Stealth Characteristics

KAAN’s design incorporates the features associated with fifth-generation fighter requirements:

• Low-observable airframe shaping: The aircraft’s external geometry is designed to reduce radar cross-section, with internal weapons bays to avoid the radar signature penalty of external stores
• Advanced avionics integration: A modern glass cockpit with integrated sensor fusion is intended to give pilots a comprehensive operational picture
• Supercruise capability: The design targets sustained supersonic flight without afterburner — a defining fifth-generation characteristic that tactical aircraft like the F-16 cannot achieve
• Internal weapons carriage: Conforming to fifth-generation doctrine, primary weapons are carried internally to preserve stealth characteristics during ingress

Engine Program: The Critical Dependency

The engine situation is KAAN’s most significant near-term constraint. The current prototypes fly on General Electric F110 engines — the same powerplant that drives the F-16 — while Turkey’s domestic engine program (the TEI TF-6000) is still in development. Don’t make my mistake of dismissing this dependency as a minor footnote — at least if you’re analyzing KAAN’s timeline to operational service, because an advanced fighter airframe without a domestic engine remains vulnerable to foreign policy disruptions in the supply chain, which is precisely the scenario that complicated Turkey’s F-35 participation in the first place.

Avionics and Mission Systems

KAAN’s avionics suite is a domestically developed system leveraging Turkey’s significant growth in defense electronics. ASELSAN, Turkey’s primary defense electronics firm, is the lead developer for mission systems. The radar is an AESA (Active Electronically Scanned Array) design providing the low-probability-of-intercept characteristics that distinguish fifth-generation from fourth-generation radar architectures. Integration of the sensor suite for full fusion — where radar, electronic warfare, and passive sensors combine into a single tactical picture — represents the most technically demanding avionics challenge in the program.

Competitive Context: Post-F-35 Landscape

Turkey’s exclusion from the F-35 program in 2019 following its S-400 acquisition created the political urgency that elevated KAAN from a long-range aspiration to an accelerated national priority. That’s what makes KAAN’s development timeline endearing to defense analysts studying industrial policy — the geopolitical pressure that removed Turkey from the world’s largest fighter program also concentrated Turkish defense investment into domestic capability in ways that would not have happened had the F-35 relationship continued. Whether that forced independence ultimately produces a more capable Turkish defense industrial base than F-35 participation would have is the central long-term question.

Flight Test Program

The first flight in February 2023 was the culmination of extensive ground testing. The flight test program is conducting envelope expansion — gradually pushing the aircraft through its performance boundaries to validate the design predictions from computational fluid dynamics and wind tunnel testing. First, you should understand that a first flight is the beginning of a long test program rather than proof of operational capability — at least if you’re tracking KAAN’s path to Turkish Air Force service, because the development timeline from first flight to initial operational capability for a new fighter typically spans years of intensive testing to clear the aircraft across its full flight envelope and weapons employment envelope.

International Cooperation and Export Ambitions

Turkey has positioned KAAN as a potential export product for partner nations seeking an alternative to Western fifth-generation fighters that come with political conditions. Azerbaijan has been discussed as a potential partner nation. The export calculus depends heavily on whether the domestic engine development succeeds — a KAAN powered by a domestic Turkish engine is a more politically independent product than one requiring GE or other Western powerplants, which would reintroduce the export control complications that KAAN was partly designed to avoid.

Program Significance for Turkish Defense Industry

KAAN represents the apex of Turkey’s defense industrialization trajectory — a process that began with licensed production of foreign systems and evolved through increasing domestic content requirements into original development of advanced weapons systems. The program’s success or failure will significantly affect Turkey’s positioning as a defense exporter and its leverage in future alliance negotiations. The engineering workforce developed through KAAN will carry capabilities that persist beyond any single aircraft program, shaping Turkish aerospace development for decades.