FAA Issues AD for Bell 206 Night Vision Imaging System

The FAA is adopting an airworthiness directive for Bell Helicopter Textron Canada models 206, 206A, 206A-1, 206B, 206B-1, 206L, 206L-1, 206L-3 and 206L-4 with Aviation Specialties Unlimited night-vision imaging system lighting modified by STC SR01383SE. It requires determining the date of STC installation and whether the aircraft has an unfiltered turbine outlet temperature internal over-temperature warning light, and based on those findings, installing an NVIS filter. The U.S. agency has warned that an unfiltered TOT indicator over-temperature warning light, when illuminated, creates glare and reflections that could degrade the pilot’s view while using night-vision goggles, thereby creating an unsafe condition.