Mt Hutt Aviation restores an MD 520N with the MD 530N upgrade, Rolls-Royce 250-C30 power, and a modern glass cockpit. MESA, Arizona, September, 2026. MD Helicopters, LLC (MDH) announced that the first MD 530N upgrade in New Zealand has entered service with Heliventures NZ, a commercial and agricultural helicopter operator based in Oamaru on the