The FAA has published final special conditions for ZeroAvia‘s Model ZA601 electric engine, establishing the bespoke regulatory requirements the company must satisfy to certify its 600 kW propulsion system for commercial use in aircraft. The rule took effect March 18.
The ZA601 is an electric motor, controller, and high-voltage electrical system that powers the propulsion shaft in ZeroAvia’s ZA600 hydrogen-electric powertrain. The ZA600 feeds DC power from a hydrogen fuel cell through bidirectional inverters to a direct-drive motor running at 2,200 rpm. It targets 10- to 20-seat turboprop-class aircraft certificated under Part 23 of FAA regulations.
In US aviation certification, special conditions are used when a technology has “novel or unusual design features” that existing rules don’t cover. Part 33—the FAA’s engine airworthiness standard—was written for turbine and reciprocating engines. It doesn’t address high-voltage electrical systems, motor controllers, or the failure modes specific to electric propulsion. Rather than apply rules written for fundamentally different hardware, the FAA writes bespoke requirements. Getting them finalized is a meaningful step: it defines what ZeroAvia must now prove in testing. The ZA601’s conditions cover ratings, operating limits, durability, fire protection, overspeed behavior, control systems, vibration, ingestion, containment and high-voltage electrical system safety.
The FAA proposed the conditions in January; it received no public comments and adopted them unchanged.
“Having special conditions for our electric propulsion system published by the FAA is an enormous achievement that underscores the aerospace maturity of our organization and illuminates our path forwards towards type certification,” said Val Miftakhov, Founder and CEO of ZeroAvia.
Full certification remains some way out. ZeroAvia has said it now targets certification of the fuel cell system alone in 2027, with the complete ZA600 powertrain potentially following up to two years after that.
Source: ZeroAvia
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