Türkiye's KAAN Fighter Program Progresses as Second Prototype Begins Systems Integration

Türkiye’s ambitious fifth-generation fighter jet program, the KAAN (formerly known as TF-X), has reached a pivotal milestone with the second prototype entering the critical systems integration phase. This development marks a significant step toward Türkiye’s goal of achieving strategic autonomy in advanced combat aviation and reducing reliance on foreign platforms such as the F-35.

Second Prototype Begins Systems Integration

Turkish Aerospace Industries (TUSAŞ), the prime contractor for the KAAN program, confirmed in September 2025 that the second flying prototype of the stealth fighter has entered its system integration phase. This stage involves installing and testing key subsystems—avionics, flight control computers, mission systems, sensors, and power distribution units—prior to ground tests and eventual flight trials.

The first prototype of KAAN conducted its maiden flight on February 21, 2024. According to TUSAŞ CEO Temel Kotil, this airframe has since completed over 20 flight sorties focused on envelope expansion and basic performance validation. The second prototype is expected to incorporate refinements based on data from these initial test flights and will serve as a platform for validating more advanced systems such as sensor fusion and electronic warfare suites.

Key Technologies Under Integration

The ongoing integration effort centers around several critical components that define fifth-generation capabilities:

AESA Radar: Developed by ASELSAN, Türkiye’s domestically produced Active Electronically Scanned Array radar is expected to offer multi-mode air-to-air and air-to-ground capabilities with low probability of intercept features.
Mission Computer & Avionics: The indigenous mission computer is designed to support sensor fusion from EO/IR sensors, radar inputs, electronic support measures (ESM), and datalinks such as Link-16 or future Turkish equivalents.
Stealth Features: The aircraft’s faceted fuselage design incorporates radar-absorbent materials (RAM) developed by TÜBİTAK SAGE. Internal weapons bays are also being tested for low-observable compliance.
Electronic Warfare Suite: A self-protection system integrating radar warning receivers (RWR), digital radio frequency memory (DRFM) jamming modules, and towed decoys is under development by TÜBİTAK BİLGEM.

This phase also includes integration of fly-by-wire controls developed in cooperation with HAVELSAN and structural health monitoring systems that will be essential for long-term fleet sustainment.

Tactical Role and Strategic Implications

The KAAN is designed to fulfill multiple roles within Türkiye’s future air combat architecture: air superiority, deep strike missions with precision-guided munitions, suppression/destruction of enemy air defenses (SEAD/DEAD), and networked operations alongside UAVs like Bayraktar Kızılelma or Anka-3 under manned-unmanned teaming (MUM-T) concepts.

Tactically, it aims to replace Türkiye’s aging F-4E Phantom IIs while eventually complementing or partially replacing F-16s. Strategically, it positions Türkiye among a select group of nations developing indigenous fifth-gen fighters—joining programs like South Korea’s KF-21 Boramae or India’s AMCA—and reduces dependence on U.S.-led platforms amid geopolitical frictions stemming from Ankara’s expulsion from the F-35 program in 2019 over its acquisition of Russian S-400 air defense systems.

Timeline Toward IOC Remains Ambitious

TUSAŞ maintains an aggressive timeline for the KAAN program despite its technological complexity. Key milestones include:

2024–2026: Flight testing of first two prototypes; expansion into high angle-of-attack regimes; validation of stealth characteristics; weapons release trials with indigenous munitions like SOM-J cruise missile or Gökdoğan/Bozdoğan AAMs.
2027–2028: Production of additional prototypes incorporating final configuration; start of limited series production if test benchmarks are met.
2029–2031: Targeted Initial Operational Capability (IOC) date for Turkish Air Force inventory inclusion; full-rate production ramp-up thereafter.

TUSAŞ plans to produce at least six flying prototypes before serial production begins. The company has expanded its facilities near Ankara specifically for KAAN manufacturing lines including composite structures fabrication and final assembly hangars equipped for stealth aircraft handling protocols.

Export Potential and International Collaboration

Ankara envisions export opportunities for KAAN among friendly nations seeking alternatives to Western fifth-gen platforms constrained by ITAR restrictions or political conditions. Pakistan has expressed interest in joining the program at various stages; Azerbaijan may also be a potential customer given deepening defense ties with Türkiye.

TUSAŞ has kept the door open for international collaboration on subsystems such as engines or avionics where domestic capabilities are still maturing. Currently powered by General Electric F110 engines under license production via TEI (TUSAŞ Engine Industries), future blocks aim to transition toward an indigenous turbofan engine being co-developed with TRMotor—a subsidiary formed explicitly for this purpose—with assistance from Ukraine’s Ivchenko Progress before Russia’s invasion disrupted cooperation timelines.

Status Among Global Fifth-Gen Programs

The global landscape for fifth-generation fighters remains dominated by U.S.-made F-22 Raptor (no longer in production) and F-35 Lightning II variants. China fields its J-20 Mighty Dragon operationally while continuing development on FC-31 Gyrfalcon. Russia’s Su-57 Felon has seen limited deployment due to production delays exacerbated by sanctions post-invasion of Ukraine.

Türkiye’s KAAN thus represents one of only a handful of active national-level efforts outside traditional great powers attempting to field an indigenous stealth-capable multirole fighter. If successful within projected timelines—and assuming no major budgetary or technical setbacks—it would significantly elevate Ankara’s aerospace industrial base while reshaping regional aerial power balances across NATO’s southeastern flank and beyond.

Conclusion

The entry of KAAN’s second prototype into system integration marks more than just an engineering milestone—it signals Türkiye’s maturing capability in advanced aerospace design amid shifting defense-industrial geopolitics. With parallel investments in unmanned combat aerial vehicles (UCAVs), precision munitions, AESA radars, EW suites, and indigenous propulsion systems underway across multiple Turkish defense firms, the broader ecosystem supporting next-gen manned aviation appears increasingly robust—if still facing challenges typical of cutting-edge military R&D programs globally.