Aevex Aerospace’s supplemental type certificate (STC) for DHC-6-300HG Twin Otter that increases the mtow from 12,500 to 14,000 pounds is now also available for DHC-6-400-series aircraft. The upgrade boosts available payload by 1,500 pounds based on an average empty weight of 7,700 pounds.
According to Aevex, the upgraded capabilities apply to aircraft operated in the standard commuter category and equipped with the Garmin G950 NXi/G1000NXi avionics suite. The upgrade also allows utilization of the full 750 shp available from the Pratt & Whitney Canada PT6A-34 engines combined with the efficiency of Raisbeck/Hartzell four-blade Scimitar propellers.
Capabilities of the Garmin system include Required Navigation Performance (RNP 0.3), WAAS/SBAS-certified GPS, and LPV approaches with minimums down to a 200-foot decision height and one-half mile visibility.
Aevex provides custom design and engineering, sensor integration and sustainment, aircraft modification and certification, and mission operations services.