(DEFENCE SECURITY ASIA) — Türkiye’s KAAN fifth-generation fighter programme has entered another consequential phase after Prototype P1 reportedly completed low-speed taxi testing around 24 July 2026, moving the advanced air-superiority aircraft closer to its maiden flight and a broader multi-prototype evaluation campaign.

Although taxiing is routine within aircraft development, P1’s movement under its own power matters strategically because it begins testing the integrated relationship among propulsion, braking, steering, flight controls and ground handling before the aircraft confronts aerodynamic loads in flight.

The milestone also carries geopolitical significance because KAAN represents Türkiye’s effort to convert an expanding aerospace industry into sovereign combat-aircraft capability, while offering prospective customers a fifth-generation platform positioned beyond the established American, Russian and Chinese fighter ecosystems.

Public evidence remains limited, however, because the initial activity was reported through defence-media channels and circulated footage rather than a dedicated TUSAŞ announcement, requiring analytical separation between the observed low-speed run, anticipated high-speed testing and still-unconfirmed maiden-flight date.

TAI Chief Executive Officer Mehmet Demiroğlu said P1 could fly “in a couple of months,” while also targeting P2’s first flight before the end of 2026, a schedule intended to place two newer flying examples into the campaign by year-end.

That timetable would expand testing beyond the original P0 demonstrator, allowing engineers to divide flight-envelope expansion, avionics validation, mission-system integration and structural evaluation across multiple aircraft instead of forcing sequential work through a single prototype with limited availability.

P1 is more representative of the intended production configuration than P0, incorporating design refinements, additional flight systems, avionics and mission-system elements that make its eventual flight data more relevant to operational capability, manufacturing maturity and Turkish Air Force acceptance planning.

The aircraft’s progress nevertheless exposes KAAN’s central industrial tension: early prototypes and approximately the first 40 production fighters are expected to rely on General Electric F110 engines, while sovereign propulsion awaits the indigenous TF35000 planned for later production blocks.

This propulsion bridge permits Türkiye to pursue initial deliveries around 2028 without waiting for a domestic engine, but it also preserves foreign supply-chain exposure across production, sustainment, upgrades and exports until a flight-qualified indigenous alternative becomes available.

Indonesia’s reported commitment for 48 aircraft transforms those technical milestones into an Indo-Pacific issue, because every delay, configuration change or propulsion restriction could affect industrial collaboration, delivery credibility and the strategic value of KAAN as an alternative fifth-generation fighter.

No programme or acquisition value was disclosed in the supplied information, meaning no responsible conversion between United States dollars and Malaysian ringgit can be calculated at the stipulated exchange rate of US$1 to RM4 without inventing financial data.

The immediate question is therefore not simply when P1 becomes airborne, but whether Türkiye can translate taxi testing into safe envelope expansion, parallel prototype activity, serial production and exportable strategic autonomy without allowing propulsion, manufacturing or logistics constraints to outrun ambition.

P1 Taxi Tests Open the Gate to a More Demanding Flight-Test Campaign

P1’s reported low-speed taxi run, conducted at the TUSAŞ runway complex near Ankara, began with the aircraft leaving its hangar and moving under installed power, an essential transition from static integration work toward dynamically testing the complete ground-control system.

At low speed, engineers can examine engine response, nose-wheel steering, braking effectiveness, control inputs and systems integration while retaining greater margin to stop the aircraft, isolate anomalies and protect a prototype carrying costly developmental hardware and irreplaceable flight-test instrumentation.

Successful completion does not prove flight readiness, because ground handling reveals only a limited portion of aerodynamic and control behaviour, yet it provides an indispensable baseline before higher-speed runs increase energy, braking demands, directional sensitivity and consequences from component failure.

High-speed taxi testing is expected next, bringing P1 closer to takeoff velocity and allowing engineers to evaluate engine performance, flight-control responses and aerodynamic behaviour under conditions that more closely approximate rotation, without necessarily committing the aircraft to sustained flight.

Reports describing the maiden flight as “a matter of days” after high-speed testing should be treated cautiously, because Demiroğlu’s broader estimate of “a couple of months” leaves room for additional checks, rectification work and programme decisions following each ground-test result.

That difference between an optimistic reporting claim and corporate leadership’s wider window illustrates the uncertainty surrounding developmental aviation, where a single instrumentation anomaly, software concern, manufacturing discrepancy or supply-chain issue can pause progression without indicating fundamental programme failure.

P1’s first flight, when authorised, would initiate progressive envelope expansion rather than demonstrate immediate combat readiness, with each sortie expected to add speed, altitude, manoeuvre, propulsion and systems data while engineers compare predicted performance against measured aircraft behaviour.

The P0 demonstrator established an initial foundation when it flew on 21 February 2024 for approximately 13 minutes, reaching about 8,000 feet, or 2,400 metres, and roughly 230 knots, equivalent to 425 kilometres per hour, with landing gear extended.

P0’s second flight on 6 May 2024 and twin-engine afterburner ground testing in December subsequently widened the programme’s evidence base, but P1’s closer-to-production systems make its campaign more consequential for validating the combat-aircraft architecture Türkiye ultimately intends to manufacture.

Strategically, every completed taxi and flight-test point reduces uncertainty for military planners and prospective buyers, yet the limited official detail surrounding P1 means force-posture conclusions must remain provisional until TUSAŞ discloses repeatable performance, verified systems maturity and sustained sortie generation.

Multiple Prototypes Could Compress Development but Multiply Integration Risk

Türkiye plans as many as six prototypes, including flying aircraft and a ground-test airframe, creating a distributed test structure intended to compress development by assigning different engineering problems to parallel assets rather than waiting for one aircraft to complete every sequence.

P1 occupies a pivotal position within that structure because it incorporates refinements beyond P0, including additional avionics, flight systems, mission equipment and reported structural or aerodynamic changes, making it a bridge between a technology demonstrator and production-representative combat aircraft.

Earlier imagery indicated adjusted air intakes, provisions potentially associated with infrared search-and-track or under-nose electro-optical equipment, and preparation for systems including the ASELSAN Tulgar helmet-mounted display or head-up display, although final configurations remain incompletely documented publicly.

Those elements matter because fifth-generation capability depends upon integrated sensors, displays, software, propulsion and low-observable shaping functioning as a coherent system-of-systems, rather than any isolated component delivering the survivability, situational awareness or mission effectiveness expected from modern air superiority platforms.

P2’s targeted flight before the end of 2026 would give the campaign another instrumented aircraft, potentially enabling simultaneous workstreams while P1 undergoes inspection, modification or data analysis, thereby improving test tempo and reducing the schedule impact of individual-airframe downtime.

Parallelism nevertheless creates its own risk because design changes discovered on one prototype must be assessed across aircraft already in assembly, potentially generating rework, configuration divergence and heavier documentation burdens precisely when the production system is trying to accelerate manufacturing.

The ground-test airframe therefore has strategic utility beyond laboratory work, because structural loads, fatigue assumptions and installation changes can be investigated without consuming flying-aircraft availability, helping protect the flight-test fleet for aerodynamic, propulsion, avionics and operational-systems evaluation.

P0 may eventually fly in formation with newer prototypes, a step that would symbolise expanding fleet activity while also permitting comparative behaviour and multi-aircraft procedures, although the supplied information provides no confirmed schedule or detailed objective for such formation testing.

For the Turkish Air Force, a growing prototype fleet offers earlier exposure to operating concepts, maintenance demands and logistics footprints, but developmental aircraft cannot yet establish a deployable force posture because reliability, weapons integration, training and sustainment evidence remain incomplete.

For foreign observers, the decisive indicator will be whether multiple airframes generate complementary data and regular sorties, since prototype quantity alone cannot demonstrate programme maturity unless engineering findings flow efficiently into verified design corrections, stable production standards and supportable operational configurations.

F110 Propulsion Sustains Near-Term Momentum While TF35000 Defines Sovereignty

The General Electric F110 provides KAAN with an available propulsion route for prototypes and initial production, allowing flight testing and planned deliveries to advance while Türkiye develops a domestic engine powerful enough to support later fifth-generation fighter configurations.

Reports indicate that approximately the first 40 production aircraft could use F110 engines, creating a substantial transitional fleet whose readiness would depend upon continued access to foreign-origin propulsion hardware, spares, technical support and any permissions affecting upgrades or third-country transfers.

That arrangement reduces near-term schedule risk because TAI reportedly possesses engines for the prototype campaign, yet it concentrates longer-term exposure within a component central to range, sortie generation, maintenance planning and the political viability of KAAN’s export proposition.

The TEI-TF35000, developed by Tusaş Engine Industries with TRMOTOR under Presidency of Defense Industries oversight, targets 35,000 pounds of thrust, approximately 156 kilonewtons, compared with roughly 29,000 pounds for the F110-GE-129 used by early KAAN aircraft.

Its design objectives include high thrust, lower fuel consumption, durability, high-temperature superalloys, advanced coatings and cooling technologies, collectively seeking the propulsion performance and thermal resilience required to support range, potential supercruise, stealth integration and demanding combat-aircraft operations.

TEI publicly revealed the engine’s design and initial data in May 2025, after an initial domestic-engine agreement in 2018 and a formal TEI-TRMOTOR partnership in 2021, demonstrating a long institutional pathway preceding any flight-capable powerplant.

TEI General Manager Professor Mahmut Faruk Akşit announced that TF35000 entered Critical Design Review in February 2026, a significant engineering gate, but no completed first engine run or flight-ready prototype had been publicly reported by mid-2026.

Ground testing and initial engine tests were targeted during 2026, while integration into KAAN is planned around 2032 for later Block 30 or Block 40 aircraft, leaving a multi-year separation between intended fighter deliveries and sovereign propulsion availability.

A separate Güçhan high-thrust turbofan, reportedly targeting about 42,000 pounds with six prototypes manufactured and qualification testing planned in 2026, introduces additional potential capacity, although its relationship to TF35000 remains publicly unclear and should not be assumed.

Ultimately, the indigenous-engine effort determines whether KAAN can achieve unrestricted sustainment, upgrade freedom and export flexibility, whereas P1’s F110-powered progress demonstrates that Türkiye’s fifth-generation timetable currently rests upon a deliberate but geopolitically exposed two-stage propulsion strategy.

Production Ambition Tests Türkiye’s Supply Chain, Logistics and 2028 Schedule

Serial production and initial Turkish Air Force deliveries are targeted around 2028, a schedule already characterised as challenging because flight-envelope expansion, mission-system integration, manufacturing maturation and support planning must progress rapidly while new prototypes are still entering testing.

P1’s maiden flight was previously projected between April and June 2026 before supply-chain and manufacturing factors contributed to slippage, making the July taxi milestone evidence of continued movement but also a warning that industrial pacing remains vulnerable.

Taxi progress cannot erase that schedule pressure, because a production fighter requires more than a flyable airframe: repeatable assembly quality, validated software, dependable avionics, propulsion availability, maintenance documentation and a trained support system must converge before operational delivery.

Parallel prototype construction is intended to reclaim time by overlapping tests and manufacturing activity, yet concurrent development means discoveries from the flight line can reach airframes already being built, increasing the importance of configuration control, engineering discipline and responsive supplier networks.

The logistics footprint will be especially complex during transition because early F110-powered fighters and later TF35000-equipped blocks could require different engine support, spares, tooling, training and upgrade pathways unless Türkiye designs commonality and conversion strategies into fleet planning.

Officials maintain that the indigenous-engine timeline will not delay serial production or deliveries, an assertion supported by access to F110s for early aircraft, but its durability depends upon uninterrupted supply arrangements and successful integration across a growing production run.

An initial production contract has been referenced, signalling movement beyond demonstrator development, although the supplied information provides no verified contract value, detailed lot composition or delivery phasing with which to assess the financial resilience and manufacturing depth behind the 2028 objective.

For military modernisation, early delivery could begin building pilot, maintainer and institutional familiarity before domestic propulsion arrives, but accepting transitional aircraft also embeds upgrade decisions that must later balance readiness, cost, fleet uniformity and strategic autonomy.

For TUSAŞ, the decisive industrial metric will be whether manufacturing can produce consistent airframes while engineering continues to evolve, because schedule compression loses strategic value if quality escapes, retrofit burdens or supply shortages reduce availability after nominal delivery.

Consequently, P1’s runway movement should be read as one link in a much larger production system, where test aircraft, engine inventories, specialist labour, component suppliers and maintenance infrastructure collectively determine whether announced timelines become credible combat capability.

Indonesia Deal Turns KAAN’s Test Progress into Indo-Pacific Strategic Signalling

Indonesia’s reported order or agreement for 48 KAAN aircraft, accompanied by industrial collaboration discussions, gives P1’s progress an international consequence because Jakarta’s future capability, local participation and delivery expectations are now connected to Türkiye’s developmental and production performance.

For Indonesia, KAAN potentially broadens combat-aircraft partnerships and supports strategic autonomy by adding a Turkish fifth-generation option, yet the value of that diversification depends upon flight-test success, export permissions, configuration clarity and a sustainable long-distance support architecture.

The propulsion transition is particularly consequential for export planning because F110-powered aircraft may retain foreign approval exposure, while TF35000 integration promises greater Turkish freedom over sales, maintenance and upgrades but is not targeted until years after initial deliveries.

Industrial collaboration can strengthen defence partnerships only when technology, manufacturing responsibilities and quality-control standards are sufficiently mature, meaning Indonesia’s strategic return will depend upon how clearly the programme converts participation concepts into executable production and sustainment arrangements.

KAAN’s twin-engine, stealth-oriented air-superiority design also carries power-balance symbolism across the Indo-Pacific, but symbolism must remain distinct from capability because no public P1 flight data yet verifies performance, mission-system maturity, operational reliability or production-scale readiness.

Other reported international interest could expand the programme’s economic base and diplomatic reach, although additional customers would also intensify pressure on engine supply, manufacturing capacity, training pipelines, spares inventories and delivery sequencing during Türkiye’s already ambitious domestic ramp-up.

From Ankara’s perspective, successful exports would help establish Türkiye as a top-tier aerospace supplier and extend strategic influence through long-term maintenance, upgrades and industrial relationships, while setbacks could expose partners to delays and weaken confidence in an emerging fighter ecosystem.

From a force-posture perspective, KAAN will matter only when customers can generate trained crews, maintain mission-capable aircraft and integrate them into national command structures, making logistics and institutional absorption as important as stealth shaping, thrust or sensors.

P1 therefore serves as strategic signalling rather than completed proof: its taxi run shows industrial intent and continuing momentum, while the absence of a maiden flight, mature domestic engine and disclosed operational data limits claims about battlefield transformation.

If P1 and P2 fly within the stated windows, prototypes generate sustained test tempo and production begins without destabilising rework, KAAN could reshape global fighter competition; if those conditions diverge, schedule credibility and export confidence will face progressively sharper scrutiny.