This article is based on an official press release from Green Taxi Aerospace and background data provided in the source material.

Green Taxi Aerospace Secures Critical FAA Concurrence for Electric Taxi System

Green Taxi Aerospace has achieved a significant regulatory milestone in its bid to decarbonize ground operations, receiving official concurrence from the Federal Aviation Administration (FAA) on its certification plan. This agreement validates the company’s roadmap for its “Zero Engine Taxi” (ZET) system, a retrofit technology designed to allow airliners to taxi without using their main jet engines.

According to the company’s announcement, this concurrence effectively “de-risks” the development program. By aligning with regulators on testing and compliance strategies before the final conforming prototype is built, Green Taxi Aerospace aims to avoid the costly re-engineering pitfalls that have plagued previous attempts at electric taxiing solutions. The approval clears the path for the company to transition from planning into detailed design and hardware fabrication.

The Plano, Texas-based startup, led by former F-16 pilot David Valaer, is targeting a Supplemental Type Certificate (STC) for the Embraer E175 regional jet by late 2027.

Regulatory Alignment Before “Cutting Metal”

In the complex world of aerospace certification, FAA concurrence is a vital “gate” event. It signifies that the regulator has reviewed and accepted the manufacturer’s proposed methods for demonstrating safety and airworthiness. For Green Taxi Aerospace, this means the specific tests and data required to prove the system is safe are now agreed upon.

CEO David Valaer emphasized the strategic importance of this patience-first approach in the company’s statement:

“We touch the APU, we touch the landing gear, we touch the pilot control system. It’s a very complicated project… We’re not going to cut metal until our data is approved by the FAA.”

, David Valaer, CEO of Green Taxi Aerospace

With the certification plan approved, the company has outlined its immediate schedule. Detailed design drawings are slated for completion by mid-2026, followed by the assembly of the first “conforming” prototype, built exactly to the certified design standards, in late 2026. Ground taxi tests on an Embraer E175 are scheduled to begin in 2027.

The “Zero Engine Taxi” Technology

The core of Green Taxi Aerospace’s innovation is a retrofit system that installs electric motors directly onto the aircraft’s main landing gear. Unlike traditional taxiing, which relies on the thrust of massive jet engines optimized for flight, the ZET system uses the aircraft’s existing Auxiliary Power Unit (APU) to power the wheels.

The APU is a small turbine engine located in the tail of the aircraft. While it burns fuel, it is significantly more efficient at ground speeds than main engines. By utilizing the APU, the aircraft can push back from the gate and taxi to the runway with its main engines turned off.

Projected Operational Savings

Green Taxi Aerospace has released data highlighting the potential efficiency gains for operators of the Embraer E175. Regional jets are the primary target because they perform frequent flights with high daily taxi times, maximizing the utility of the system.

According to company projections:

• Fuel Savings: Approximately 80,000 gallons per aircraft, per year.
• Cost Reductions: Estimated savings of $250,000 to $350,000 per aircraft annually, factoring in fuel and maintenance.
• Emissions: An 85% reduction in ground-level carbon emissions compared to single-engine taxiing.

Crucially, the system is designed to be lightweight. The company states the total system weight is under 300 lbs. This is a critical metric; if the system is too heavy, the fuel burned carrying the extra weight during flight could negate the savings achieved on the ground.

Strategic Partnerships

To navigate the certification process, Green Taxi has partnered with StandardAero, a major aerospace maintenance, repair, and overhaul (MRO) provider. StandardAero is leading the certification effort, a move Valaer describes as essential for credibility.

“This partnership with StandardAero positions us for success by aligning our innovative technology with a proven certification partner.”

, David Valaer, CEO of Green Taxi Aerospace

Additionally, the company is collaborating with Delta Air Lines through its “Sustainable Skies Lab” to validate operational data, ensuring the technology meets the rigorous demands of a major commercial carrier.

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Contextualizing the Competitive Landscape

While the concept of electric taxiing is not new, Green Taxi Aerospace’s approach attempts to solve the specific engineering hurdles that stalled previous ventures. In 2013, the EGTS joint venture between Safran and Honeywell attempted a similar main-gear concept. However, that system reportedly weighed over 600 lbs and required extensive airframe modifications, which ultimately destroyed the business case.

Green Taxi’s claim of a sub-300 lb system suggests significant advancements in electric motor density over the last decade. By keeping the weight low, they address the primary failure point of the EGTS program.

The company also faces different competition than its predecessors. WheelTug is developing a system that places motors in the nose gear. While this simplifies installation, the nose gear carries less weight, which can limit traction in icy conditions or on slopes. Green Taxi’s decision to power the main gear offers better traction but represents a more complex integration challenge.

Another alternative, TaxiBot, uses semi-robotic tugs to tow planes. While this requires no aircraft modification, it introduces logistical complexity at busy airports, as tugs must return to the gate after every departure. Green Taxi’s onboard solution avoids this congestion but places the capital cost and weight penalty directly on the airline.

With FAA concurrence now secured, Green Taxi Aerospace has cleared the first major hurdle in proving that a lightweight, onboard electric taxi system is not just theoretically possible, but commercially viable.

Sources:
Green Taxi Aerospace Press Release
StandardAero
Delta Sustainable Skies Lab