EASA Regulations for Tomark Viper SD-4 RTC

Engine – Propeller Gearbox – Inspection

EASA Airworthiness Directive 2026-0170 is an airworthiness directive addressing the inspection of propeller gearboxes installed on certain light sport and general aviation aeroplanes equipped with BRP-Rotax 912 ULS2 engines. The affected aircraft include Evektor SportStar RTC, Tomark Viper SD-4 RTC, Breezer B600, and Czech Aircraft Group PS-28 Cruiser models. The directive mandates inspection for missing oil spray nozzles and securing screws in the propeller gearbox to prevent potential engine oil loss or uncommanded engine shutdown.