High Performance Aircraft (HPA) has ditched the use of Kevlar propulsion drive belts in its TT62 long-range turboprop pusher business aircraft to avoid lengthy certification delays. The Rostock, Germany-based company has changed the design of its strut-mounted propellers to rigid transmission. HPA decided that belt slackness issues and unfamiliarity with the technology would lead to delays in certification, set for the end of 2005.
Source: Flight International