KAI confirms that it is working with Airbus Helicopters to "retrofit the defective Surions". The rotorcraft, which resembles the AS332 Super Puma, was developed indigenously in South Korea, with extensive assistance from the European company. Responding to the report, Airbus Helicopters states: "As the supplier of the Surion main gearbox, which bears close similarities with the AS332 L2 and EC225 LP main gearboxes, Airbus Helicopters has issued an emergency alert service bulletin calling for the withdrawal of a specific type of second-stage planet gears in order to provide increased reliability and safety across the Surion fleet. "We are providing our full support to Korea Aerospace Industries and Korean operators as they manage the associated retrofit programme," it adds. Flight Fleets Analyzer shows that there are 52 Surions in service, with another 49 on firm order.