While the new design maintained a similar generator layout to the preceding AS 330, it was powered by two of the new and more powerful Turbomeca Makila turboshaft engines, which drove a four-bladed main rotor which made use of composite materials.
Aínda que o novo deseño mantiña un esquema semellante ao do AS 330, estaba impulsado por dous dos novos e máis potentes motores turboeixo Turbomeca Makila, que movían un rotor principal de catro palas que facían uso de materiais compostos.