A Method Of Operating A Rotorcraft In A Single Engine Operation Mode
Patent No. EP4467449 (titled "A Method Of Operating A Rotorcraft In A Single Engine Operation Mode") was filed by Airbus Helicopters Deutschland on May 24, 2023. The application was issued on Oct 15, 2025.
Patent Summary
A method for operating a rotorcraft in cruise mode involves determining if the aircraft is in All Engines Operative (AEO) mode or Single Engine Operation (SEO) mode, where only a first engine powers at least one main rotor while a second engine remains inactive. In SEO mode, the first engine is monitored for failures. Upon detecting a failure, the flight control system automatically enters the main rotor into autorotation by adjusting main rotor actuators. The method further comprises re-adjusting said actuators to bring the current rotor speed to a nominal autorotation rotor speed. Additional optional steps include reducing flight speed, stabilizing autorotation, restarting the inactive second engine, and recovering the original cruising altitude and flight speed.
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Date
Description
EP4467449
- Application Number
- EP23175083A
- Filing Date
- May 24, 2023
- Status
- Granted And Under Opposition
- Sep 12, 2025
- Publication Date
- Oct 15, 2025
- External Links
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