One major customer introduced the use of flat steps replacing the earlier tubes, a feature now almost universal. In 1987, the Canadian Engineering Centennial Board named the DHC-2 as one of the top ten Canadian engineering achievements of the 20th century. 1995 to 2019 At one point in its production, plans to license-build the Beaver in New Zealand were proposed. The remaining tooling was purchased by Viking Air of Victoria, British Columbia, Canada, which manufactures replacement parts for most of the early de Havilland line. The company markets and sells the remanufactured DHC-2T Turbo Beaver, an improved variant of the aircraft which has been upgraded with a PT6A-34, which enables an increased maximum gross takeoff weight of and the carriage of up to of freight, a roughly 25 per cent increase in usable payload. By August 1995, Viking completed its 30th Turbo Beaver conversion. The firm has also developed and marketed other improvements for the type, such as an advanced wing and modified floats. Other manufacturers have also offered aftermarket upgrades and modifications for the type, such as re-engining programmes by Orenda Aerospace and Wipaire. On 24 February 2006, Viking purchased the type certificates from Bombardier Aerospace for all the original de Havilland designs, including the Beaver. The ownership of the certificates gives the company the exclusive right to manufacture new aircraft. Viking has stated its interest in the potential restart of production of the Beaver, and commented that, dependent upon market demand, the firm may offer two separate models of the Beaver, one intended to be close to the design of the original batch, and another incorporating various improvements such as new avionics, engines, and doors, as well as likely being stretched to provide increased internal space. Stolairus Aviation of Kelowna, British Columbia has developed several modifications for the DHC-2 including a STOL Kit which modifies the wing with a contoured leading edge, flap-gap seals, wing fences and drooped wingtips for increased performance. Stolairus has also developed a Wing Angle Kit which changes the incidence of the wing. Advanced Wing Technologies of Vancouver, British Columbia has developed and certified a new wing for the DHC-2. The FAA Supplemental Type Certificate also raises the aircraft's gross weight to . So far, at least two Beavers have been modified in such a manner. In September 2017 the Transportation Safety Board of Canada recommended stall warning devices be mandated for commercial Beaver